C# 引用dll 報錯:Attempted to read or write protected memory.

zheng_ 2009-03-03 11:19:45

現在引用一個封裝好的dll,兩個方法:
long ImportMerPK(long keyUsage, long length, byte[] data)-----正常
long ExportMerPK(long keyUsage, long[] length, byte[] data)-----報錯
所以我懷疑long[] length這里錯誤，不過long都ok, byte[]也ok。請教下~~~

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piaomiaoguhun 2011-03-04

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楼主找到解决方法没有啊？能分享一下吗？

zheng_ 2009-03-06

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[Quote=引用 13 楼 lateknow 的回复:]
试着用Depends.Exe打开DLL,看能不能看到函数定义...
[/Quote]
我使用Depends.Exe 看到了函數原形
unsigned long ExportMerPK(unsigned long,unsigned long *,unsigned char *)

zheng_ 2009-03-03

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[Quote=引用 9 楼 lateknow 的回复:]
DLL是用什么语言写的?一定要匹配.给出DLL函数原型,才能帮你具体分析.
[/Quote]
商業的實在拿不到了 java寫的

lateknow 2009-03-03

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DLL是用什么语言写的?一定要匹配.给出DLL函数原型,才能帮你具体分析.

zheng_ 2009-03-03

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long ExportMerPK(long keyUsage, long[] length, byte[] data)
我直接使用簡單的數組參數為何不行？byte[]都是可以的啊,

zheng_ 2009-03-03

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[Quote=引用 6 楼 jinjazz 的回复:]
参数类型还可以随便传?
[/Quote]
我描述太不明了，我的意思是我在C#里面引的時候long類型都正常，long[]應該也是沒有問題的吧

jinjazz 2009-03-03

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参数类型还可以随便传?

zheng_ 2009-03-03

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[Quote=引用 3 楼 devilli 的回复:]
也可能与机器有关，换个电脑试试
[/Quote]
試了一樣

zheng_ 2009-03-03

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[Quote=引用 2 楼 ljhcy99 的回复:]
ExportMerPK方法里面是不是写了不安全代码？是不是有指针相关的代码？　
[/Quote]

沒有原代碼，如果dll內部操作使用指針應該跟外部引用沒有關系吧

devilli 2009-03-03

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也可能与机器有关，换个电脑试试

ljhcy99 2009-03-03

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ExportMerPK方法里面是不是写了不安全代码？是不是有指针相关的代码？　

zheng_ 2009-03-03

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自己up

lateknow 2009-03-03

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试着用Depends.Exe打开DLL,看能不能看到函数定义...

oyljerry 2009-03-03

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不同语言之间，像数组等，处理起来方式可能不一样，从而调用有问题...

Harvey_He 2009-03-03

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数据类型移植的问题可能需要指定数组长度,或java和C#里面的long类型的长度并不匹配。

{****************************************************************************** * * * PROJECT : EOS Digital Software Development Kit EDSDK * * NAME : EDSDKApi.pas * * * * Description: This is the Sample code to show the usage of EDSDK. * * * * * ******************************************************************************* * * * Written and developed by Camera Design Dept.53 * * Copyright Canon Inc. 2006 All Rights Reserved * * * ******************************************************************************* * File Update Information: * * DATE Identify Comment * * ----------------------------------------------------------------------- * * 06-03-22 F-001 create first version. * * * ******************************************************************************} unit EDSDKApi; interface uses EDSDKType, EDSDKError; const edsdk = 'EDSDK.DLL'; { ****************************************************************************** ********************* Initialize / Terminate Function ************************ ****************************************************************************** } { ----------------------------------------------------------------------------- Function : EdsInitializeSDK Description : Initializes the libraries. When using the EDSDK libraries, you must call this API once before using EDSDK APIs. Parameters: In: None Out: None Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. ------------------------------------------------------------------------------- } function EdsInitializeSDK( ) : EdsError ; stdcall; external edsdk; { ----------------------------------------------------------------------------- Function : EdsTerminateSDK Description : Terminates use of the libraries. Calling this function releases all resources allocated by the libraries. This function delete all the reference or list objects that user has forgotten to delete. Parameters: In: None Out: None Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. ------------------------------------------------------------------------------- } function EdsTerminateSDK( ) : EdsError ; stdcall; external edsdk; { ****************************************************************************** *********************** Referense Count Function ***************************** ****************************************************************************** } { ----------------------------------------------------------------------------- Function : EdsRetain Description: Increments the reference counter of existing objects. Parameters: In: inRef - The reference for the object item. Out: None Returns: Returns a reference counter if successful. For errors, returns $FFFFFFFF. ------------------------------------------------------------------------------- } function EdsRetain( inRef : EdsBaseRef ) : EdsUInt32 ; stdcall; external edsdk; { ----------------------------------------------------------------------------- Function : EdsRelease Description: Decrements the reference counter to an object. When the reference counter reaches 0, the object is released. Parameters: In: inRef - The reference of the object item. Out: None Returns: Returns a reference counter if successful. For errors, returns $FFFFFFFF. ----------------------------------------------------------------------------- } function EdsRelease( inRef : EdsBaseRef ) : EdsUInt32 ; stdcall; external edsdk; { ****************************************************************************** ************************** Item Tree Handling Function *********************** ****************************************************************************** } { ----------------------------------------------------------------------------- Function : EdsGetChildCount Description: Gets the number of child objects of the designated object. Parameters: In: inBaseRef - The reference of the list. Out: outCount - Number of elements in this list. Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. ------------------------------------------------------------------------------- } function EdsGetChildCount( inRef : EdsBaseRef; var outCount : EdsUInt32 ) : EdsError ; stdcall; external edsdk; { ----------------------------------------------------------------------------- Function : EdsGetChildAtIndex Description: Gets an indexed child object of the designated object. Parameters: In: inRef - The reference of the item. inIndex - The index that is passed in, is zero based. Out: outBaseRef - The pointer which receives reference of the specified index. Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. ------------------------------------------------------------------------------ } function EdsGetChildAtIndex( inRef : EdsBaseRef ; inIndex : EdsInt32 ; var outBaseRef : EdsBaseRef ) : EdsError ; stdcall; external edsdk; { ----------------------------------------------------------------------------- Function : EdsGetParent Description: Get the parent object. Parameters: In: inRef - The reference of the item. Out: outParentRef - The pointer which receives reference. Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. ------------------------------------------------------------------------------ } function EdsGetParent( inRef : EdsBaseRef; var outParentRef : EdsBaseRef ) : EdsError ; stdcall; external edsdk; { ****************************************************************************** ******************************* Property Function **************************** ****************************************************************************** } { ----------------------------------------------------------------------------- Function : EdsGetPropertySize Description: Gets the byte size and data type of a designated property from a camera object or image object. Parameters: In: inRef - The reference of the item. inPropertyID - The ProprtyID inParam - Additional information of property. We use this parameter in order to specify an index in case there are two or more values over the same ID. Out: outType - Pointer to the buffer that is to receive the property type data. outSize - Pointer to the buffer that is to receive the property size. Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. ------------------------------------------------------------------------------ } function EdsGetPropertySize( inRef : EdsBaseRef; inPropertyID : EdsPropertyID; inParam : EdsInt32; var outDataType : EdsDataType; var outSize : EdsUInt32 ) : EdsError ; stdcall; external edsdk; { ----------------------------------------------------------------------------- Function : EdsGetPropertyData Description: Gets property information from the object designated in inRef. Parameters: In: inRef - The reference of the item. inPropertyID - The ProprtyID inParam - Additional information of property. We use this parameter in order to specify an index in case there are two or more values over the same ID. inPropertySize - The number of bytes of the prepared buffer for receive property-value. Out: outPropertyData - The buffer pointer to receive property-value. Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. ----------------------------------------------------------------------------- } function EdsGetPropertyData( inRef : EdsBaseRef; inPropertyID : EdsPropertyID; inParam : EdsInt32; inPropertySize : EdsUInt32; // var outPropertyData : EdsUInt32 ) : EdsError ; stdcall; external edsdk; var outPropertyData : Pointer ) : EdsError ; stdcall; external edsdk; { ----------------------------------------------------------------------------- Function : EdsSetPropertyData Description: Sets property data for the object designated in inRef. Parameters: In: inRef - The reference of the item. inPropertyID - The ProprtyID inParam - Additional information of property. inPropertySize - The number of bytes of the prepared buffer for set property-value. InPropertyData - The buffer pointer to set property-value. Out: none Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. ----------------------------------------------------------------------------- } function EdsSetPropertyData( inRef : EdsBaseRef; inPropertyID : EdsPropertyID; inParam : EdsInt32; inPropertySize : EdsUInt32; InPropertyData : Pointer ) : EdsError; stdcall; external edsdk; { ----------------------------------------------------------------------------- Function : EdsGetPropertyDesc Description: Gets a list of property data that can be set for the object designated in inRef, as well as maximum and minimum values. This API is intended for only some shooting-related properties. Parameters: In: inRef - The reference of the camera. inPropertyID - The Property ID. inPropertySize - The number of bytes of the prepared buffer for receive property-value. Out: outPropertyDesc - Array of the value which can be set up. Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. EDS_ERR_INVALID_PARAMETER is returned if a property ID is designated in inPropertyID that cannot be used with GetPropertyDesc. -----------------------------------------------------------------------------} function EdsGetPropertyDesc( inRef : EdsBaseRef; inPropertyID : EdsPropertyID; var outPropertyDesc : EdsPropertyDesc ) : EdsError; stdcall; external edsdk; { ****************************************************************************** ******************** Device List and Device Operation Function *************** ****************************************************************************** } { ----------------------------------------------------------------------------- Function : EdsGetCameraList Description: Get the camera list objects Parameters: In: None Out: outCameraListRef - the camera-list. Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. ----------------------------------------------------------------------------- } function EdsGetCameraList( var outCameraListRef : EdsCameraListRef ) : EdsError ; stdcall; external edsdk; { ----------------------------------------------------------------------------- Function : EdsGetDeviceInfo Description: Get information as the device of the camera of the port number etc. Device information can be acquired before OpenSession is done. Parameters: In: inCameraRef - The reference of the camera. Out: outDeviceInfo - Information as device of camera. See EdsDeviceInfo structure in EDSDKType.pas Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. ----------------------------------------------------------------------------- } function EdsGetDeviceInfo( inCameraRef : EdsCameraRef; var outDeviceInfo : EdsDeviceInfo) : EdsError ; stdcall ; external edsdk; { ****************************************************************************** ************************* Camera Operation Function ************************** ****************************************************************************** } {----------------------------------------------------------------------------- Function : EdsOpenSession Description: Establishes a logical connection with a remote camera. Parameters: In: inCameraRef - The reference of the camera Out: None Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. -----------------------------------------------------------------------------} function EdsOpenSession( inCameraRef : EdsCameraRef) : EdsError ; stdcall; external edsdk; {----------------------------------------------------------------------------- Function : EdsCloseSession Description: Closes a logical connection with a remote camera. Parameters: In: inCameraRef - The reference of the camera Out: None Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. -----------------------------------------------------------------------------} function EdsCloseSession( inCameraRef : EdsCameraRef ) : EdsError ; stdcall; external edsdk; { ----------------------------------------------------------------------------- Function : EdsSendCommand Description: Send the specified command to to the camera. Parameters: In: inCameraRef - The reference of the camera which will receive the command. inCommand - Specifies the command to be sent. inParam - Specifies additional command-specific information. Out: None Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. ----------------------------------------------------------------------------- } function EdsSendCommand( inCameraRef : EdsCameraRef; inCommand : EdsCameraCommand; inParam : EdsInt32 ) : EdsError ; stdcall ; external edsdk; {----------------------------------------------------------------------------- Function : EdsSendStatusCommand Description: Sets the remote camera state or mode. Parameters: In: inCameraRef - The reference of the camera which will receive the command. inStatusCommand - Designate the particular mode ID to set the camera to. inParam - Specifies additional command-specific information. Out: None Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. -----------------------------------------------------------------------------} function EdsSendStatusCommand( inCameraRef : EdsCameraRef; inStatusCommand : EdsCameraStateCommand; inParam : EdsInt32 ) : EdsError ; stdcall ; external edsdk; { ----------------------------------------------------------------------------- Function : EdsSetCapacity Description: Sets the remaining HDD capacity on the host computer (excluding the portion from image transfer), as calculated by subtracting the portion from the previous time. Set a reset flag initially and designate the cluster length and number of free clusters. Parameters: In: inCameraRef - The reference of the camera which will receive the command. inCapacity - Designate information regarding the host computer's hard drive capacity. Out: None Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. ----------------------------------------------------------------------------- } function EdsSetCapacity( inCameraRef : EdsCameraRef ; inCapacity : EdsCapacity ) : EdsError ; stdcall ; external edsdk; { ****************************************************************************** ************************* Volume Operation Function ************************** ****************************************************************************** } { ----------------------------------------------------------------------------- Function : EdsGetVolumeInfo Description: Gets volume information for a memory card in the camera. Parameters: In: EdsVolumeRef - The reference of the volume to get volume information. Out: outDeviceInfo - Information of the volume. See EdsVolumeInfo structure in EDSDKType.h Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. ----------------------------------------------------------------------------- } function EdsGetVolumeInfo( inVolumeRef : EdsVolumeRef; var outVolumeInfo : EdsVolumeInfo ) : EdsError ; stdcall ; external edsdk; { ----------------------------------------------------------------------------- Function : EdsFormatVolume Description: Formats volumes of memory cards in a camera. Parameters: In: inVolumeRef - reference of volume . Out: none Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. ----------------------------------------------------------------------------- } function EdsFormatVolume( inVolumeRef : EdsVolumeRef ) : EdsError ; stdcall ; external edsdk; { ****************************************************************************** ********************* Directory Item Operation Function ********************** ****************************************************************************** } { ----------------------------------------------------------------------------- Function : EdsGetDirectoryItemInfo Description: Gets information about the directory or file objects on the memory card (volume) in a remote camera. Parameters: In: inDirItemRef - The reference of the directory item. Out: outDirItemInfo - Information of the directory item. Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. ----------------------------------------------------------------------------- } function EdsGetDirectoryItemInfo( inDirItemRef : EdsDirectoryItemRef ; var outDirItemInfo : EdsDirectoryItemInfo ) : EdsError ; stdcall ; external edsdk; { ----------------------------------------------------------------------------- Function : EdsDeleteDirectoryItem Description: Deletes a camera folder or file. If folders with subdirectories are designated, all files are deleted except protected files. EdsDirectoryItem objects deleted by means of this API are implicitly released by the EDSDK. Thus, there is no need to release them by means of EdsRelease. Parameters: In: inDirItemRef - The reference of the directory item. Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. ----------------------------------------------------------------------------- } function EdsDeleteDirectoryItem( inDirItemRef : EdsDirectoryItemRef ) : EdsError ; stdcall ; external edsdk; { ----------------------------------------------------------------------------- Function : EdsDownload Description: Downloads a file on a remote camera (in the camera memory or on a memory card) to the host computer. The downloaded file is sent directly to a file stream created in advance. When dividing the file being retrieved, call this API repeatedly. Also in this case, make the data block size a multiple of 512 (bytes), excluding the final block. Parameters: In: inDirItemRef - The reference of the directory item. inReadSize - Size to read inDestStream - The reference of the stream to target. Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. ----------------------------------------------------------------------------- } function EdsDownload ( inDirItemRef : EdsDirectoryItemRef; inReadSize : EdsUInt32 ; inDestStream : EdsStreamRef ) : EdsError ; stdcall ; external edsdk; { ----------------------------------------------------------------------------- Function : EdsDownloadComplete Description: Must be called when downloading of directory items is complete. Executing this API makes the camera recognize that file transmission is complete. This operation need not be executed when using EdsDownloadThumbnail. Parameters: In: inDirItemRef - The reference of the directory item. Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. ----------------------------------------------------------------------------- } function EdsDownloadComplete( inDirItemRef : EdsDirectoryItemRef ) : EdsError ; stdcall ; external edsdk; { ----------------------------------------------------------------------------- Function : EdsDownloadCancel Description: Must be executed when downloading of a directory item is canceled. Calling this API makes the camera cancel file transmission. It also releases resources. This operation need not be executed when using EdsDownloadThumbnail. Parameters: In: inDirItemRef - The reference of the directory item. Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. ----------------------------------------------------------------------------- } function EdsDownloadCancel( inDirItemRef : EdsDirectoryItemRef ) : EdsError ; stdcall ; external edsdk; { ----------------------------------------------------------------------------- Function : EdsDownloadThumbnail Description: Extracts and downloads thumbnail information from image files in a camera. Thumbnail information in the camera's image files is downloaded to the host computer. Downloaded thumbnails are sent directly to a file stream created in advance. Parameters: In: inDirItemRef - The reference of the directory item. inDestStream - The reference of the stream to target. Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. ----------------------------------------------------------------------------- } function EdsDownloadThumbnail( inDirItemRef : EdsDirectoryItemRef; inDestStream : EdsStreamRef ) : EdsError ; stdcall ; external edsdk; {----------------------------------------------------------------------------- Function : EdsGetAttribute Description: Gets attributes of files on a camera. Parameters: In: inDirItemRef - The reference of the directory item. Out: outFileAttribute - Valueables to be stored file sttributes Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. ----------------------------------------------------------------------------- } function EdsGetAttribute( inDirItemRef : EdsDirectoryItemRef; var outFileAttribute : EdsFileAttributes ) : EdsError ; stdcall ; external edsdk; {----------------------------------------------------------------------------- Function: EdsSetAttribute Description: Changes attributes of files on a camera. Parameters: In: inDirItemRef - The reference of the directory item. inFileAttribute - File attributes flag to be set Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. -----------------------------------------------------------------------------} function EdsSetAttribute( inDirItemRef : EdsDirectoryItemRef; inFileAttribute : EdsFileAttributes ) : EdsError ; stdcall ; external edsdk; { ****************************************************************************** ************************ Stream Operation Function *************************** ****************************************************************************** } { ----------------------------------------------------------------------------- Function : EdsCreateFileStream Description: Creates a new file on a host computer (or opens an existing file) and creates a file stream for access to the file. If a new file is designated before executing this API, the file is actually created following the timing of writing by means of EdsWrite or the like with respect to an open stream. Parameters: In: inFileName - Pointer to a null-terminated string that specifies the file name. inCreateDisposition - Action to take on files that exist, and which action to take when files do not exist. inDesiredAccess - Access to the stream (reading, writing, or both). Out: outStream - The reference of the stream. Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. ----------------------------------------------------------------------------- } function EdsCreateFileStream( inFileName : PChar ; inCreateDisposition : EdsFileCreateDisposition; inDesiredAccess : EdsAccess ; var outStream : EdsStreamRef ) : EdsError ; stdcall ; external edsdk; {----------------------------------------------------------------------------- Function : EdsCreateMemoryStream Description: Creates a stream in the memory of a host computer. In the case of writing in excess of the allocated buffer size, the memory is automatically extended. Parameters: In: inBufferSize - Number of bytes of the memory to allocate. Out: outStream - The reference of the stream. Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. ----------------------------------------------------------------------------- } function EdsCreateMemoryStream( inBufferSize : EdsUInt32 ; var outStream : EdsStreamRef ) : EdsError ; stdcall ; external edsdk; // SDK 2.7 //function EdsCreateStream( inStream : EdsIStream ; var outStreamRef : EdsStreamRef ) : EdsError ; stdcall ; external edsdk; {----------------------------------------------------------------------------- Function : EdsCreateFileStreamEx Description: An extended version of EdsCreateFileStream. Use this function when working with Unicode file names. Parameters: In: inFileName - Pointer to wide strings inCreateDisposition - Action to take on files that exist, and which action to take when files do not exist. inDesiredAccess - Access to the stream (reading, writing, or both). Out: outStream - reference of the stream. Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. ----------------------------------------------------------------------------- } function EdsCreateFileStreamEx( inFileName : PWideChar ; inCreateDisposition : EdsFileCreateDisposition ; inDesiredAccess : EdsAccess ; var outStream : EdsStreamRef ) : EdsError ; stdcall ; external edsdk; { ----------------------------------------------------------------------------- Function : EdsCreateMemoryStreamFromPointer Description: Creates a stream from the memory buffer you prepare. Unlike the buffer size of streams created by means of EdsCreateMemoryStream, the buffer size you prepare for streams created this way does not expand. Parameters: In: inUserBuffer - Pointer to the buffer you have prepared inBufferSize - Number of bytes of the memory to allocate. Out: outStream - The reference of the stream. Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. ----------------------------------------------------------------------------- } function EdsCreateMemoryStreamFromPointer( inUserBuffer : Pointer; inBufferSize : EdsUInt32; var outStream : EdsStreamRef ) : EdsError ; stdcall ; external edsdk; {----------------------------------------------------------------------------- Function : EdsGetPointer Description: Gets the pointer to the start address of memory managed by the memory stream. As the EDSDK automatically resizes the buffer, the memory stream provides you with the same access methods as for the file stream. If access is attempted that is excessive with regard to the buffer size for the stream, data before the required buffer size is allocated is copied internally, and new writing occurs. Thus, the buffer pointer might be switched on an unknown timing. Caution in use is therefore advised. Parameters: In: inStream - object to memory stream Out: outPointer - Pointer to valueable stored the pointer Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. -----------------------------------------------------------------------------} function EdsGetPointer( inStream : EdsStreamRef; var outPointer : Pointer ) : EdsError ; stdcall ; external edsdk; {----------------------------------------------------------------------------- Function : EdsRead Description: Reads data the size of inReadSize into the outBuffer buffer, starting at the current read or write position of the stream. The size of data actually read can be designated in outReadSize. Parameters: In: inStreamRef - The reference of the stream or image. inReadSize - Number of bytes to read. Out: outBuffer - Pointer to the user-supplied buffer that is to receive the data read from the stream. outReadSize - Actual read number of bytes. Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. ----------------------------------------------------------------------------- } function EdsRead( inStreamRef : EdsStreamRef; inReadSize : EdsUInt32; var outBuffer : Pointer; var outReadSize : EdsUInt32) : EdsError; stdcall; external edsdk; {----------------------------------------------------------------------------- Function : EdsWrite Description: Writes data of a designated buffer to the current read or write position of the stream. Parameters: In: inStreamRef - The reference of the stream or image. inWriteSize - Number of bytes to write. inBuffer - Pointer to the user-supplied buffer that contains the data to be written to the stream. Out: outWrittenSize - Actual written-in number of bytes. Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. -----------------------------------------------------------------------------} function EdsWrite( inStreamRef : EdsStreamRef; inWriteSize : EdsUInt32; const inBuffer : Pointer; var outWrittenSize : EdsUInt32 ) : EdsError; stdcall; external edsdk; {----------------------------------------------------------------------------- Function : EdsSeek Description: Moves the read or write position of the stream (that is, the file position indicator). Parameters: In: inStreamRef - The reference of the stream or image. inSeekOffset - Number of bytes to move the pointer. inSeekOrigin - Pointer movement mode. Must be one of the following values. kEdsSeek_Cur Move the stream pointer inSeekOffset bytes from the current position in the stream. kEdsSeek_Begin Move the stream pointer inSeekOffset bytes forward from the beginning of the stream. kEdsSeek_End Move the stream pointer inSeekOffset bytes from the end of the stream. Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. -----------------------------------------------------------------------------} function EdsSeek( inStreamRef : EdsStreamRef; inSeekOffset : EdsUInt32; inSeekOrigin : EdsSeekOrigin ) : EdsError; stdcall; external edsdk; {----------------------------------------------------------------------------- Function : EdsGetPosition Description: Gets the current read or write position of the stream (that is, the file position indicator). Parameters: In: inStreamRef - The reference of the stream or image. Out: outPosition - Current stream pointer. Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. -----------------------------------------------------------------------------} function EdsGetPosition( inStreamRef : EdsStreamRef; var outPosition : EdsUInt32 ) : EdsError; stdcall; external edsdk; {----------------------------------------------------------------------------- Function : EdsGetLength Description: Get the length of the stream in bytes. Parameters: In: inStreamRef - The reference of the stream or image. Out: outLength - Length of the stream. Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. -----------------------------------------------------------------------------} function EdsGetLength( inStreamRef : EdsStreamRef; var outLength : EdsUInt32 ) : EdsError; stdcall; external edsdk; {----------------------------------------------------------------------------- Function : EdsCopyData Description: Copies data from the copy source stream to the copy destination stream. The read or write position of the data to copy is determined from the current file read or write position of the respective stream. After this API is executed, the read or write positions of the copy source and copy destination streams are moved an amount corresponding to inWriteSize in the positive direction. Parameters: In: inSrcStreamRef - The reference of the source stream. inWriteSize - number of bytes to copy. inDestStreamRef - The reference of the destination stream. Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. -----------------------------------------------------------------------------} function EdsCopyData( inSrcStreamRef : EdsStreamRef; inWriteSize : EdsUInt32; inDestStreamRef : EdsStreamRef ) : EdsError; stdcall; external edsdk; { ****************************************************************************** ************************* Setup Operation Function *************************** ****************************************************************************** } {----------------------------------------------------------------------------- Function : EdsSetProgressCallback Description: Register a progress callback function. An event is received as notification of progress during processing that takes a relatively long time, such as downloading files from a remote camera. If you register the callback function, the EDSDK calls the callback function during execution or on completion of the following APIs This timing can be used in updating on-screen progress bars, for example. APIs : EdsCopyData, EdsDownload, EdsGetImage Parameters: In: inRef - The reference of the stream or image. inProgressCallback - Pointer to a progress callback function. inProgressOption - Option about progress is specified. this must be set one of the following values. kEdsProgressOption_Done When processing is completed,a callback function is called only at once. kEdsProgressOption_Periodically A callback function is performed periodically. inContext - Specifies an application-defined value to be sent to the callback function pointed to by CallBack parameter. Out: None Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. -----------------------------------------------------------------------------} function EdsSetProgressCallback( inRef : EdsBaseRef; inProgressCallback : EdsProgressCallback; inProgressOption : EdsProgressOption; inContext : EdsUInt32 ) : EdsError; stdcall; external edsdk; { ****************************************************************************** ************************* Image Operation Function *************************** ****************************************************************************** } {----------------------------------------------------------------------------- Function : EdsCreateImageRef Description: Creates an image object from an image file. Without modification, stream objects cannot be worked with as images. Thus, when extracting images from image files, you must use this API to create image objects. The image object created this way can be used to get image information (such as the height and width, number of color components, and resolution), thumbnail image data, and the image data itself. Parameters: In: inStreamRef - The reference of the stream. Out: outImageRef - The reference of the image. Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. -----------------------------------------------------------------------------} function EdsCreateImageRef( inStreamRef : EdsStreamRef; var outImageRef : EdsImageRef ) : EdsError; stdcall; external edsdk; {----------------------------------------------------------------------------- Function : EdsGetImageInfo Description: Gets image information from a designated image object. Here, image information means the image width and height, number of color components, resolution, and effective image area. See EdsImageInfo definition of EDSDKType.pas Parameters: In: inImageRef - The reference of the image. inImageSource - Specfies kind of image - thumbnail, preview, fullview Out: outImageInfo - Infomaiton of the image. Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. ----------------------------------------------------------------------------- } function EdsGetImageInfo( inImageRef : EdsImageRef; inImageSource : EdsImageSource; var outImageInfo : EdsImageInfo ) : EdsError; stdcall; external edsdk; {----------------------------------------------------------------------------- Function : EdsGetImage Description: Gets designated image data from an image file, in the form of a designated rectangle. Returns uncompressed results for JPEGs and processed results in the designated pixel order (RGB, Top-down BGR, and so on) for RAW images. Additionally, by designating the input/output rectangle, it is possible to get reduced, enlarged, or partial images. However, because images corresponding to the designated output rectangle are always returned by the SDK, the SDK does not take the aspect ratio into account. To maintain the aspect ratio, you must keep the aspect ratio in mind when designating the rectangle. Parameters: In: inImageRef : The reference of image object inImageSource : Specfies kind of image - thumbnail, preview, fullview inImageType : Specifies image type ID number inSrcRect : Rectangle of the source image inDstSize : Designate the rectangle size for output. Out: outStreamRef : The reference of memory stream Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. -----------------------------------------------------------------------------} function EdsGetImage( inImageRef : EdsImageRef; inImageSource : EdsImageSource; inImageType : EdsTargetImageType; inSrcRect : EdsRect; inDstSize : EdsSize; inStreamRef : EdsStreamRef ) : EdsError ; stdcall; external edsdk; {----------------------------------------------------------------------------- Function : EdsSaveImage Description: Saves as a designated image type after RAW processing. When saving with JPEG compression, the JPEG quality setting applies with respect to EdsOptionRef. Parameters: In: inImageRef : The reference of image inImageType : Specifies image format ID number inSaveOption : Specifies save option Out: outStreamRef : The reference of file stream Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. -----------------------------------------------------------------------------} function EdsSaveImage( inImageRef : EdsImageRef; inImageType : EdsTargetImageType; inSaveSetting : EdsSaveImageSetting; var outStreamRef : EdsStreamRef ): EdsError ; stdcall ; external edsdk; {----------------------------------------------------------------------------- Function : EdsCacheImage Description: Switches a setting on and off for creation of an image cache in the SDK for a designated image object during extraction (processing) of the image data. Creating the cache increases the processing speed, starting from the second time. Parameters: In: inImageRef - The reference of the image. inUseCache - Whether cache image data , If TRUE, cache image. If FALSE, the cached image data will released. Out: none Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. -----------------------------------------------------------------------------} function EdsCacheImage( inImageRef : EdsImageRef; inUseCache : EdsBool ) : EdsError; stdcall; external edsdk; {----------------------------------------------------------------------------- Function : EdsReflectImageProperty Description: Incorporates image object property changes (effected by means of EdsSetPropertyData) in the stream. Parameters: In: inImageRef - The reference of the image. Out: none Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. -----------------------------------------------------------------------------} function EdsReflectImageProperty( inImageRef : EdsImageRef ) : EdsError; stdcall; external edsdk; {----------------------------------------------------------------------------- Function: EdsCreateEvfImageRef Description: Creates an object used to get the live view image data set. Parameters: In: inStreamRef - The stream reference which opened to get EVF JPEG image. Out: outEvfImageRef - The EVFData reference. Returns: Any of the sdk errors. -----------------------------------------------------------------------------} function EdsCreateEvfImageRef ( inStreamRef : EdsStreamRef; var outEvfImageRef : EdsEvfImageRef ) : EdsError; stdcall; external edsdk; {----------------------------------------------------------------------------- Function: EdsDownloadEvfImage Description: Downloads the live view image data set for a camera currently in live view mode. Live view can be started by using the property ID:kEdsPropertyID_Evf_OutputDevice and data:EdsOutputDevice_PC to call EdsSetPropertyData. In addition to image data, information such as zoom, focus position, and histogram data is included in the image data set. Image data is saved in a stream maintained by EdsEvfImageRef. EdsGetPropertyData can be used to get information such as the zoom, focus position, etc. Although the information of the zoom and focus position can be obtained from EdsEvfImageRef, settings are applied to EdsCameraRef. Parameters: In: inCameraRef - The Camera reference. In: inEvfImageRef - The EVFData reference. Returns: Any of the sdk errors. -----------------------------------------------------------------------------} function EdsDownloadEvfImage ( inCameraRef : EdsCameraRef; inEvfImageRef : EdsEvfImageRef) : EdsError; stdcall; external edsdk; { ****************************************************************************** *********************** Event Handler Setup Function ************************* ****************************************************************************** } {----------------------------------------------------------------------------- Function : EdsSetCameraAddedHandler Description: This function registers the callback function called when a camera is connected physically. Parameters: In: inCameraAddedHandler - Pointer to a callback function called when a camera is connected physically inContext - Specifies an application-defined value to be sent to the callback function pointed to by CallBack parameter. Out: None Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. -----------------------------------------------------------------------------} function EdsSetCameraAddedHandler( inCameraAddedHandler : EdsCameraAddedHandler; inContext : EdsUInt32 ) : EdsError; stdcall; external edsdk; {----------------------------------------------------------------------------- Function : EdsSetPropertyEventHandler EdsSetObjectEventHandler EdsSetCamerStateEventHandler Description: This function registers the callback function called when an event occurs to the camera. EdsSetPropertyEventHandler Registers a callback function for receiving status change notification events for property states on a camera. EdsSetObjectEventHandler Registers a callback function for receiving status change notification events for objects on a remote camera. Here, object means volumes representing memory cards, files and directories, and shot images stored in memory, in particular. EdsSetCamerStateEventHandler Registers a callback function for receiving status change notification events for camera objects. Parameters: In: inCameraRef - The reference of the camera. inEvent - Event ID number ( PropertyEvent, ObjectEvent, StateEvent ) inEventHandler - Pointer to a callback function called when an event occurs to the camera. inContext - Specifies an application-defined value to be sent to the callback function pointed to by CallBack parameter. Out: None Returns: Returns EDS_ERR_OK if successful. In other cases, see EDSDKError.pas. -----------------------------------------------------------------------------} function EdsSetPropertyEventHandler( inCameraRef : EdsCameraRef; inEvent : EdsPropertyEvent; inPropertyEventHandler : Pointer; inContext : EdsUInt32 ) : EdsError; stdcall; external edsdk; function EdsSetObjectEventHandler( inCameraRef : EdsCameraRef; inEvent : EdsObjectEvent; inObjectEventHandler : Pointer; inContext : EdsUInt32 ) : EdsError; stdcall; external edsdk; function EdsSetCameraStateEventHandler( inCameraRef : EdsCameraRef; inEvent : EdsStateEvent; inStateEventHandler : Pointer; inContext : EdsUInt32 ) : EdsError; stdcall; external edsdk; {----------------------------------------------------------------------------- Function: EdsGetEvent Description: This function acquires an event. In console application, please call this function regularly to acquire the event from a camera. Parameters: In: None Out: None Returns: Any of the sdk errors. -----------------------------------------------------------------------------} function EdsGetEvent() : EdsError; stdcall; external edsdk; //27 implementation end.

c# 调用C++的dll报错 Attempted to read or write protected memory：原因是：c# 传递Null的string值导致的，将Null改为string.empty即可

1. Haskell的代码如下：上面的代码中readMarkdown与writeHtmlString是pandoc中的函数，newString的作用是将String转换为IO CString。 2. C语言的代码如下：上面的代码是dll的调用入口。 3. ghc编译出来的头文件如下： 4. C#调用代码如下： class Native { [DllImp...

“尝试读取或写入受保护的内存这通常指示其他内存已损坏"。System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.此类错误屡见不鲜了，特别是图像开发，Com组件操作时，不要期望本文能够给你...

Hi,I am getting this errorAttempted to read or write protected memory. This is often an indication that other memory is corrupt.on this line of codes :-DialogResult dr = openFileDialog1.ShowDialog();/...

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