vb 如何读取网页缓存中的内容 Temporary Internet Files

2006-02-16 07:37:37 390 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

BUCK 电路详解参考内容：手撕Buck！Buck公式推导过程电力电子的基础应用《精通开关电源设计（第二版）》 Buck电源芯片输出有问题？检查这几样原来PWM这么简单！ BUCK 电路构建根据高中所学习的物理知识可以很容易的想到，使用一个滑动变阻器即可实现降压和稳压的效果。当负载波动时，通过改变滑动变阻器的阻值，可以调节负载所获得的电压。但是使用滑动变阻器的劣势也很明显，大量的耗能会导致器件温度快速升高。上面所提到的电路主要缺点在于导通器件（变阻器或三极管）本身存在耗能，那么有没有不会耗能的导通器件呢？阅读详情

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proer9988 2006-02-16

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anticlimax 2006-02-16

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'Option Explicit
Private Declare Function CopyFile Lib "kernel32" Alias "CopyFileA" (ByVal lpExistingFileName As String, ByVal lpNewFileName As String, ByVal bFailIfExists As Long) As Long
'--------------------------Types, consts and structures
Private Const ERROR_CACHE_FIND_FAIL As Long = 0
Private Const ERROR_CACHE_FIND_SUCCESS As Long = 1
Private Const ERROR_FILE_NOT_FOUND As Long = 2
Private Const ERROR_ACCESS_DENIED As Long = 5
Private Const ERROR_INSUFFICIENT_BUFFER As Long = 122
Private Const MAX_CACHE_ENTRY_INFO_SIZE As Long = 4096
Private Const LMEM_FIXED As Long = &H0
Private Const LMEM_ZEROINIT As Long = &H40
Public Enum eCacheType
eNormal = &H1&
eEdited = &H8&
eTrackOffline = &H10&
eTrackOnline = &H20&
eSticky = &H40&
eSparse = &H10000
eCookie = &H100000
eURLHistory = &H200000
eURLFindDefaultFilter = 0&
End Enum
Private Type FILETIME
dwLowDateTime As Long
dwHighDateTime As Long
End Type
Private Type INTERNET_CACHE_ENTRY_INFO
dwStructSize As Long
lpszSourceUrlName As Long
lpszLocalFileName As Long
CacheEntryType As Long 'Type of entry returned
dwUseCount As Long
dwHitRate As Long
dwSizeLow As Long
dwSizeHigh As Long
LastModifiedTime As FILETIME
ExpireTime As FILETIME
LastAccessTime As FILETIME
LastSyncTime As FILETIME
lpHeaderInfo As Long
dwHeaderInfoSize As Long
lpszFileExtension As Long
dwExemptDelta As Long
End Type
'--------------------------Internet Cache API
Private Declare Function FindFirstUrlCacheEntry Lib "Wininet.dll" Alias "FindFirstUrlCacheEntryA" (ByVal lpszUrlSearchPattern As String, lpFirstCacheEntryInfo As Any, lpdwFirstCacheEntryInfoBufferSize As Long) As Long
Private Declare Function FindNextUrlCacheEntry Lib "Wininet.dll" Alias "FindNextUrlCacheEntryA" (ByVal hEnumHandle As Long, lpNextCacheEntryInfo As Any, lpdwNextCacheEntryInfoBufferSize As Long) As Long
Private Declare Function FindCloseUrlCache Lib "Wininet.dll" (ByVal hEnumHandle As Long) As Long
Private Declare Function DeleteUrlCacheEntry Lib "Wininet.dll" Alias "DeleteUrlCacheEntryA" (ByVal lpszUrlName As String) As Long
'--------------------------Memory API
Private Declare Function LocalAlloc Lib "kernel32" (ByVal uFlags As Long, ByVal uBytes As Long) As Long
Private Declare Function LocalFree Lib "kernel32" (ByVal hMem As Long) As Long
Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (pDest As Any, pSource As Any, ByVal dwLength As Long)
Private Declare Function lstrcpyA Lib "kernel32" (ByVal RetVal As String, ByVal Ptr As Long) As Long
Private Declare Function lstrlenA Lib "kernel32" (ByVal Ptr As Any) As Long
'Purpose : Deletes the specified internet cache file
'Inputs : sCacheFile The name of the cache file
'Outputs : Returns True on success.
'Author : Andrew Baker
'Date : 03/08/2000 19:14
'Notes :
'Revisions :
Function InternetDeleteCache(sCacheFile As String) As Boolean
InternetDeleteCache = CBool(DeleteUrlCacheEntry(sCacheFile))
End Function
'Purpose : Returns an array of files stored in the internet cache
'Inputs : eFilterType An enum which filters the files returned by their type
'Outputs : A one dimensional, one based, string array containing the names of the files
'Author : Andrew Baker
'Date : 03/08/2000 19:14
'Notes :
'Revisions :
Function InternetCacheList(Optional eFilterType As eCacheType = eNormal) As Variant
Dim ICEI As INTERNET_CACHE_ENTRY_INFO
Dim lhFile As Long, lBufferSize As Long, lptrBuffer As Long
Dim sCacheFile As String
Dim asURLs() As String, lNumEntries As Long
'Determine required buffer size
lBufferSize = 0
lhFile = FindFirstUrlCacheEntry(0&, ByVal 0&, lBufferSize)
If (lhFile = ERROR_CACHE_FIND_FAIL) And (Err.LastDllError = ERROR_INSUFFICIENT_BUFFER) Then
'Allocate memory for ICEI structure
lptrBuffer = LocalAlloc(LMEM_FIXED, lBufferSize)
If lptrBuffer Then
'Set a Long pointer to the memory location
CopyMemory ByVal lptrBuffer, lBufferSize, 4
'Call first find API passing it the pointer to the allocated memory
lhFile = FindFirstUrlCacheEntry(vbNullString, ByVal lptrBuffer, lBufferSize) '1 = success
If lhFile <> ERROR_CACHE_FIND_FAIL Then
'Loop through the cache
Do
'Copy data back to structure
CopyMemory ICEI, ByVal lptrBuffer, Len(ICEI)
If ICEI.CacheEntryType And eFilterType Then
sCacheFile = StrFromPtrA(ICEI.lpszSourceUrlName) & "|" & StrFromPtrA(ICEI.lpszLocalFileName)
lNumEntries = lNumEntries + 1
If lNumEntries = 1 Then
ReDim asURLs(1 To 1)
Else
ReDim Preserve asURLs(1 To lNumEntries)
End If
asURLs(lNumEntries) = sCacheFile
End If
'Free memory associated with the last-retrieved file
Call LocalFree(lptrBuffer)
'Call FindNextUrlCacheEntry with buffer size set to 0.
'Call will fail and return required buffer size.
lBufferSize = 0
Call FindNextUrlCacheEntry(lhFile, ByVal 0&, lBufferSize)
'Allocate and assign the memory to the pointer
lptrBuffer = LocalAlloc(LMEM_FIXED, lBufferSize)
CopyMemory ByVal lptrBuffer, lBufferSize, 4&
Loop While FindNextUrlCacheEntry(lhFile, ByVal lptrBuffer, lBufferSize)
End If
End If
End If
'Free memory
Call LocalFree(lptrBuffer)
Call FindCloseUrlCache(lhFile)
InternetCacheList = asURLs
End Function
'Purpose : Converts a pointer an ansi string into a string.
'Inputs : lptrString A long pointer to a string held in memory
'Outputs : The string held at the specified memory address
'Author : Andrew Baker
'Date : 03/08/2000 19:14
'Notes :
'Revisions :
Function StrFromPtrA(ByVal lptrString As Long) As String
'Create buffer
StrFromPtrA = String$(lstrlenA(ByVal lptrString), 0)
'Copy memory
Call lstrcpyA(ByVal StrFromPtrA, ByVal lptrString)
End Function
'Demonstration routine
Sub GetCookies(CurrentUrl)
Dim avURLs As Variant, vThisValue As Variant
On Error Resume Next

'Return the an array of all cookies
avURLs = InternetCacheList(eCookie)
For Each vThisValue In avURLs
Print cookie; Files
If InStr(CStr(vThisValue), CurrentUrl) > 0 Then
Debug.Print vThisValue
Exit Sub
End If
Next
End Sub

Private Sub Test()
Dim avURLs As Variant, vThisValue As Variant, s1, s2
On Error Resume Next
'Return an array of all internet cache files
avURLs = InternetCacheList
For Each vThisValue In avURLs
'Print files

If vThisValue ..... then
'这里你可以就得到的值进行操作
End If
DoEvents
Next
Debug.Print List1.ListCount
End Sub

Private Sub Form_Load()
Call Test
End Sub

Public Function FileExists(filename As String) As Boolean
Dim i As Integer
On Error Resume Next
i = Len(Dir$(filename))
If Err Or i = 0 Then FileExists = False Else FileExists = True
End Function

eslbs 2006-02-16

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如果你要的是删除缓存里的文件啊cookie之类的代码
网上搜索就一大堆了

eslbs 2006-02-16

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判断网上的某网页或文件是否在缓存
http://club.5ivb.net/UploadFile/200561911026byUID16686.rar

我改进的代码

判断网上的某网页或文件是否在缓存，如果是，就返回该文件在缓存Temporary Internet Files 的全路径
如果不在缓存就返回提示信息

vb 如何读取网页缓存中的内容 Temporary Internet Files

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