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分享读取注册表的内容－－－－急
我的代码是：
char *data = new char[100＋1];
LPDWORD size = new DWORD;
*size = 100;
result = ::RegQueryValueEx(hKey,
"IFDType",
NULL,
REG_SZ,
(LPBYTE *)data,
&size);
它的错误信息为：
error C2664: 'RegQueryValueExA' : cannot convert parameter 4 from 'const int' to 'unsigned long *'
Conversion from integral type to pointer type requires reinterpret_cast, C-style cast or function-style cast
Error executing cl.exe.
char *data = new char[100＋1];
LPDWORD size = new DWORD;
*size = 100;
result = ::RegQueryValueEx(hKey,
"IFDType",
NULL,
REG_SZ,
(LPBYTE *)data,
&size);
它的错误信息为：
error C2664: 'RegQueryValueExA' : cannot convert parameter 4 from 'const int' to 'unsigned long *'
Conversion from integral type to pointer type requires reinterpret_cast, C-style cast or function-style cast
Error executing cl.exe.
...全文
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DoubleJiang 2004-08-11
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RegQueryValueEx
The RegQueryValueEx function retrieves the type and data for a specified value name associated with an open registry key.
LONG RegQueryValueEx(
HKEY hKey, // handle to key to query
LPTSTR lpValueName, // address of name of value to query
LPDWORD lpReserved, // reserved
LPDWORD lpType, // address of buffer for value type
LPBYTE lpData, // address of data buffer
LPDWORD lpcbData // address of data buffer size
);
Parameters
hKey
Handle to a currently open key or any of the following predefined reserved handle values:
HKEY_CLASSES_ROOT
HKEY_CURRENT_CONFIG
HKEY_CURRENT_USER
HKEY_LOCAL_MACHINE
HKEY_USERS
Windows NT: HKEY_PERFORMANCE_DATA
Windows 95 and Windows 98: HKEY_DYN_DATA
lpValueName
Pointer to a null-terminated string containing the name of the value to query.
If lpValueName is NULL or an empty string, "", the function retrieves the type and data for the key's unnamed or default value, if any.
Windows 95 and Windows 98: Every key has a default value that initially does not contain data. On Windows 95, the default value type is always REG_SZ. On Windows 98, the type of a key's default value is initially REG_SZ, but RegSetValueEx can specify a default value with a different type.
Windows NT: Keys do not automatically have an unnamed or default value. Unnamed values can be of any type.
lpReserved
Reserved; must be NULL.
lpType
Pointer to a variable that receives the type of data associated with the specified value. The value returned through this parameter will be one of the following: Value Meaning
REG_BINARY Binary data in any form.
REG_DWORD A 32-bit number.
REG_DWORD_LITTLE_ENDIAN A 32-bit number in little-endian format. This is equivalent to REG_DWORD.
In little-endian format, a multi-byte value is stored in memory from the lowest byte (the "little end") to the highest byte. For example, the value 0x12345678 is stored as (0x78 0x56 0x34 0x12) in little-endian format.
Windows NT, Windows 95, and Windows 98 are designed to run on little-endian computer architectures. A user may connect to computers that have big-endian architectures, such as some UNIX systems.
REG_DWORD_BIG_ENDIAN A 32-bit number in big-endian format.
In big-endian format, a multi-byte value is stored in memory from the highest byte (the "big end") to the lowest byte. For example, the value 0x12345678 is stored as (0x12 0x34 0x56 0x78) in big-endian format.
REG_EXPAND_SZ A null-terminated string that contains unexpanded references to environment variables (for example, "%PATH%"). It will be a Unicode or ANSI string depending on whether you use the Unicode or ANSI functions. To expand the environment variable references, use theExpandEnvironmentStrings function.
REG_LINK A Unicode symbolic link.
REG_MULTI_SZ An array of null-terminated strings, terminated by two null characters.
REG_NONE No defined value type.
REG_RESOURCE_LIST A device-driver resource list.
REG_SZ A null-terminated string. It will be a Unicode or ANSI string depending on whether you use the Unicode or ANSI functions.
The lpType parameter can be NULL if the type is not required.
lpData
Pointer to a buffer that receives the value's data. This parameter can be NULL if the data is not required.
lpcbData
Pointer to a variable that specifies the size, in bytes, of the buffer pointed to by the lpData parameter. When the function returns, this variable contains the size of the data copied to lpData.
If the data has the REG_SZ, REG_MULTI_SZ or REG_EXPAND_SZ type, then lpcbData will also include the size of the terminating null character.
The lpcbData parameter can be NULL only if lpData is NULL.
If the buffer specified by lpData parameter is not large enough to hold the data, the function returns the value ERROR_MORE_DATA, and stores the required buffer size, in bytes, into the variable pointed to by lpcbData.
If lpData is NULL, and lpcbData is non-NULL, the function returns ERROR_SUCCESS, and stores the size of the data, in bytes, in the variable pointed to by lpcbData. This lets an application determine the best way to allocate a buffer for the value's data.
Window NT: If hKey specifies HKEY_PERFORMANCE_DATA and the lpData buffer is too small, RegQueryValueEx returns ERROR_MORE_DATA but lpcbData does not return the required buffer size. This is because the size of the performance data can change from one call to the next. In this case, you must increase the buffer size and call RegQueryValueEx again passing the updated buffer size in the lpcbData parameter. Repeat this until the function succeeds. You need to maintain a separate variable to keep track of the buffer size, because the value returned by lpcbData is unpredictable.
Return Values
If the function succeeds, the return value is ERROR_SUCCESS.
If the function fails, the return value is a nonzero error code defined in WINERROR.H. You can use the FormatMessage function with the FORMAT_MESSAGE_FROM_SYSTEM flag to get a generic description of the error.
Remarks
The key identified by hKey must have been opened with KEY_QUERY_VALUE access. To open the key, use the RegCreateKeyEx or RegOpenKeyEx function.
If the value data has the REG_SZ, REG_MULTI_SZ or REG_EXPAND_SZ type, and the ANSI version of this function is used (either by explicitly calling RegQueryValueExA or by not defining UNICODE before including the WINDOWS.H file), this function converts the stored Unicode string to an ANSI string before copying it to the buffer pointed to by lpData.
Window NT: When calling the RegQueryValueEx function with hKey set to the HKEY_PERFORMANCE_DATA handle and a value string of a specified object, the returned data structure sometimes has unrequested objects. Don't be surprised; this is normal behavior. When calling the RegQueryValueEx function, you should always expect to walk the returned data structure to look for the requested object.
QuickInfo
Windows NT: Requires version 3.1 or later.
Windows: Requires Windows 95 or later.
Windows CE: Requires version 1.0 or later.
Header: Declared in winreg.h.
Import Library: Use advapi32.lib.
Unicode: Implemented as Unicode and ANSI versions on Windows NT.
See Also
Registry Overview, Registry Functions,ExpandEnvironmentStrings, RegCreateKeyEx, RegEnumKey, RegEnumKeyEx, RegEnumValue, RegOpenKeyEx, RegQueryInfoKey, RegQueryValue
The RegQueryValueEx function retrieves the type and data for a specified value name associated with an open registry key.
LONG RegQueryValueEx(
HKEY hKey, // handle to key to query
LPTSTR lpValueName, // address of name of value to query
LPDWORD lpReserved, // reserved
LPDWORD lpType, // address of buffer for value type
LPBYTE lpData, // address of data buffer
LPDWORD lpcbData // address of data buffer size
);
Parameters
hKey
Handle to a currently open key or any of the following predefined reserved handle values:
HKEY_CLASSES_ROOT
HKEY_CURRENT_CONFIG
HKEY_CURRENT_USER
HKEY_LOCAL_MACHINE
HKEY_USERS
Windows NT: HKEY_PERFORMANCE_DATA
Windows 95 and Windows 98: HKEY_DYN_DATA
lpValueName
Pointer to a null-terminated string containing the name of the value to query.
If lpValueName is NULL or an empty string, "", the function retrieves the type and data for the key's unnamed or default value, if any.
Windows 95 and Windows 98: Every key has a default value that initially does not contain data. On Windows 95, the default value type is always REG_SZ. On Windows 98, the type of a key's default value is initially REG_SZ, but RegSetValueEx can specify a default value with a different type.
Windows NT: Keys do not automatically have an unnamed or default value. Unnamed values can be of any type.
lpReserved
Reserved; must be NULL.
lpType
Pointer to a variable that receives the type of data associated with the specified value. The value returned through this parameter will be one of the following: Value Meaning
REG_BINARY Binary data in any form.
REG_DWORD A 32-bit number.
REG_DWORD_LITTLE_ENDIAN A 32-bit number in little-endian format. This is equivalent to REG_DWORD.
In little-endian format, a multi-byte value is stored in memory from the lowest byte (the "little end") to the highest byte. For example, the value 0x12345678 is stored as (0x78 0x56 0x34 0x12) in little-endian format.
Windows NT, Windows 95, and Windows 98 are designed to run on little-endian computer architectures. A user may connect to computers that have big-endian architectures, such as some UNIX systems.
REG_DWORD_BIG_ENDIAN A 32-bit number in big-endian format.
In big-endian format, a multi-byte value is stored in memory from the highest byte (the "big end") to the lowest byte. For example, the value 0x12345678 is stored as (0x12 0x34 0x56 0x78) in big-endian format.
REG_EXPAND_SZ A null-terminated string that contains unexpanded references to environment variables (for example, "%PATH%"). It will be a Unicode or ANSI string depending on whether you use the Unicode or ANSI functions. To expand the environment variable references, use theExpandEnvironmentStrings function.
REG_LINK A Unicode symbolic link.
REG_MULTI_SZ An array of null-terminated strings, terminated by two null characters.
REG_NONE No defined value type.
REG_RESOURCE_LIST A device-driver resource list.
REG_SZ A null-terminated string. It will be a Unicode or ANSI string depending on whether you use the Unicode or ANSI functions.
The lpType parameter can be NULL if the type is not required.
lpData
Pointer to a buffer that receives the value's data. This parameter can be NULL if the data is not required.
lpcbData
Pointer to a variable that specifies the size, in bytes, of the buffer pointed to by the lpData parameter. When the function returns, this variable contains the size of the data copied to lpData.
If the data has the REG_SZ, REG_MULTI_SZ or REG_EXPAND_SZ type, then lpcbData will also include the size of the terminating null character.
The lpcbData parameter can be NULL only if lpData is NULL.
If the buffer specified by lpData parameter is not large enough to hold the data, the function returns the value ERROR_MORE_DATA, and stores the required buffer size, in bytes, into the variable pointed to by lpcbData.
If lpData is NULL, and lpcbData is non-NULL, the function returns ERROR_SUCCESS, and stores the size of the data, in bytes, in the variable pointed to by lpcbData. This lets an application determine the best way to allocate a buffer for the value's data.
Window NT: If hKey specifies HKEY_PERFORMANCE_DATA and the lpData buffer is too small, RegQueryValueEx returns ERROR_MORE_DATA but lpcbData does not return the required buffer size. This is because the size of the performance data can change from one call to the next. In this case, you must increase the buffer size and call RegQueryValueEx again passing the updated buffer size in the lpcbData parameter. Repeat this until the function succeeds. You need to maintain a separate variable to keep track of the buffer size, because the value returned by lpcbData is unpredictable.
Return Values
If the function succeeds, the return value is ERROR_SUCCESS.
If the function fails, the return value is a nonzero error code defined in WINERROR.H. You can use the FormatMessage function with the FORMAT_MESSAGE_FROM_SYSTEM flag to get a generic description of the error.
Remarks
The key identified by hKey must have been opened with KEY_QUERY_VALUE access. To open the key, use the RegCreateKeyEx or RegOpenKeyEx function.
If the value data has the REG_SZ, REG_MULTI_SZ or REG_EXPAND_SZ type, and the ANSI version of this function is used (either by explicitly calling RegQueryValueExA or by not defining UNICODE before including the WINDOWS.H file), this function converts the stored Unicode string to an ANSI string before copying it to the buffer pointed to by lpData.
Window NT: When calling the RegQueryValueEx function with hKey set to the HKEY_PERFORMANCE_DATA handle and a value string of a specified object, the returned data structure sometimes has unrequested objects. Don't be surprised; this is normal behavior. When calling the RegQueryValueEx function, you should always expect to walk the returned data structure to look for the requested object.
QuickInfo
Windows NT: Requires version 3.1 or later.
Windows: Requires Windows 95 or later.
Windows CE: Requires version 1.0 or later.
Header: Declared in winreg.h.
Import Library: Use advapi32.lib.
Unicode: Implemented as Unicode and ANSI versions on Windows NT.
See Also
Registry Overview, Registry Functions,ExpandEnvironmentStrings, RegCreateKeyEx, RegEnumKey, RegEnumKeyEx, RegEnumValue, RegOpenKeyEx, RegQueryInfoKey, RegQueryValue
me2love 2004-08-11
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谢谢您们的回复，但是还是不正确
bohut 2004-08-11
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unsigned char *lpData = new unsigned char[100];
DWORD datasize;
result = ::RegQueryValueEx(hKey,
"IFDType",
NULL,
NULL,
lpData ,
&datasize);
DWORD datasize;
result = ::RegQueryValueEx(hKey,
"IFDType",
NULL,
NULL,
lpData ,
&datasize);
无敌魔仙 2004-08-11
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错误为类型不符，要求是'unsigned long *'，但你提供的是 'const int'
快乐鹦鹉 2004-08-11
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REG_SZ regSz;
result = ::RegQueryValueEx(hKey,
"IFDType",
NULL,
®Sz,
(LPBYTE *)data,
&size);
这样呢？
result = ::RegQueryValueEx(hKey,
"IFDType",
NULL,
®Sz,
(LPBYTE *)data,
&size);
这样呢？
快乐鹦鹉 2004-08-11
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result = ::RegQueryValueEx(hKey,
"IFDType",
NULL,
®_SZ,
(LPBYTE *)data,
&size);
这样呢？
"IFDType",
NULL,
®_SZ,
(LPBYTE *)data,
&size);
这样呢？
