用Inet下载能不能不用缓存啊?,我用inet下载的,郁闷死了,IE缓存占用高的惊人,能不能让它不用缓存的??请给出代码~
下面是我使用的代码:Option Explicit
Private Declare Function InternetOpen Lib "wininet" Alias "InternetOpenA" (ByVal sAgent As String, ByVal lAccessType As Long, ByVal sProxyName As String, ByVal sProxyBypass As String, ByVal lFlags As Long) As Long
Private Declare Function InternetCloseHandle Lib "wininet" (ByRef hInet As Long) As Long
Private Declare Function InternetReadFile Lib "wininet" (ByVal hFile As Long, sBuffer As Byte, ByVal lNumBytesToRead As Long, lNumberOfBytesRead As Long) As Integer
Private Declare Function InternetOpenUrl Lib "wininet" Alias "InternetOpenUrlA" (ByVal hInternetSession As Long, ByVal lpszUrl As String, ByVal lpszHeaders As String, ByVal dwHeadersLength As Long, ByVal dwFlags As Long, ByVal dwContext As Long) As Long
Private Declare Function HttpQueryInfo Lib "wininet.dll" Alias "HttpQueryInfoA" (ByVal hHttpRequest As Long, ByVal lInfoLevel As Long, ByVal sBuffer As Any, ByRef lBufferLength As Long, ByRef lIndex As Long) As Integer
Private Const INTERNET_OPEN_TYPE_PRECONFIG = 0
Private Const scUserAgent = "Tgwang"
Private Const INTERNET_OPEN_TYPE_DIRECT = 1
Private Const INTERNET_OPEN_TYPE_PROXY = 3
Private Const INTERNET_FLAG_RELOAD = &H80000000
Private mvarUrl As String
Private mvarSaveFile As String
Private mvarConnect As Boolean
Private hOpen As Long, hFile As Long
Private Buffer As String, BufLen As Long
Private RetQueryInfo As Boolean
Public Event GetData(Progress As Long) '下载进度
Public Event ErrMassage(Description As String) '错误信息
Public Event DownLoadOver()
Public Sub Execute() mvarConnect = True hOpen = InternetOpen(scUserAgent, INTERNET_OPEN_TYPE_DIRECT, vbNullString, vbNullString, 0) If mvarConnect = False Then
Cancel
Exit Sub
End If If hOpen = 0 Then
Cancel
RaiseEvent ErrMassage("无法创建连接")
mvarConnect = False
Else hFile = InternetOpenUrl(hOpen, mvarUrl, vbNullString, ByVal 0&, INTERNET_FLAG_RELOAD, ByVal 0&) If mvarConnect = False Then
Cancel
Exit Sub
End If If hFile = 0 Then
Cancel
RaiseEvent ErrMassage("无法连接服务器")
mvarConnect = False
Else
Buffer = Space$(1024)
BufLen = 1024
RetQueryInfo = HttpQueryInfo(hFile, 21, Buffer, BufLen, 0) If RetQueryInfo Then
Buffer = Mid$(Buffer, 1, BufLen)
Else
Buffer = ""
End If End If End IfEnd Sub
Public Function StartDownLoad() As Boolean Dim sBuffer(1 To 1024) As Byte, Ret As Long
Dim intfile As Long, LBR As Long
Dim i As Long
If mvarConnect = False Then
Cancel
StartDownLoad = False
Exit Function
End If On Error GoTo OutErr
Err.Clear
'If Dir$(mvarSaveFile) > " " Then
' Name mvarSaveFile As mvarSaveFile & ".bak"
'End If
intfile = FreeFile()
Open mvarSaveFile For Binary Access Write As #intfile
Do
InternetReadFile hFile, sBuffer(1), 1024, Ret
DoEvents
If Ret = 1024 Then
If mvarConnect = False Then
StartDownLoad = False
GoTo Quit
End If Put #1, , sBuffer
Else
For i = 1 To Ret
Put #1, , sBuffer(i)
DoEvents
Next i
End If
LBR = LBR + Ret
RaiseEvent GetData(LBR)
DoEvents
Loop Until Ret < 1024
RaiseEvent DownLoadOver
Quit:
Close #intfile
'if Dir$(mvarSaveFile & ".bak") > " " Then
' Kill mvarSaveFile
' Name mvarSaveFile & ".bak" As mvarSaveFile
'End If
Cancel Exit FunctionOutErr:
Err.Clear
Cancel
Close #intfile
RaiseEvent ErrMassage("文件" & mvarSaveFile & "正在使用,无法进行操作")
On Error GoTo 0End FunctionPublic Sub Cancel() mvarConnect = False
InternetCloseHandle hOpen
InternetCloseHandle hFileEnd SubPublic Property Let SaveFile(ByVal FileName As String) mvarSaveFile = FileNameEnd PropertyPublic Property Let URL(ByVal URL As String)
mvarUrl = URLEnd Property
Public Function GetHeader(Optional hdrName As String) As String Dim tmp As Long
Dim tmp2 As String If mvarConnect = False Then
GetHeader = "0"
Cancel
Exit Function
End If
If Buffer <> "" Then
Select Case UCase$(hdrName)
Case "CONTENT-LENGTH"
tmp = InStr(Buffer, "Content-Length")
tmp2 = Mid$(Buffer, tmp + 16, Len(Buffer))
tmp = InStr(tmp2, Chr$(0))
GetHeader = CStr(Mid$(tmp2, 1, tmp - 1))
Case "CONTENT-TYPE"
tmp = InStr(Buffer, "Content-Type")
tmp2 = Mid$(Buffer, tmp + 14, Len(Buffer))
tmp = InStr(tmp2, Chr$(0))
GetHeader = CStr(Mid$(tmp2, 1, tmp - 1))
Case "DATE"
tmp = InStr(Buffer, "Date")
tmp2 = Mid$(Buffer, tmp + 6, Len(Buffer))
tmp = InStr(tmp2, Chr$(0))
GetHeader = CStr(Mid$(tmp2, 1, tmp - 1))
Case "LAST-MODIFIED"
tmp = InStr(Buffer, "Last-Modified")
tmp2 = Mid$(Buffer, tmp + 15, Len(Buffer))
tmp = InStr(tmp2, Chr$(0))
GetHeader = CStr(Mid$(tmp2, 1, tmp - 1))
Case "SERVER"
tmp = InStr(Buffer, "Server")
tmp2 = Mid$(Buffer, tmp + 8, Len(Buffer))
tmp = InStr(tmp2, Chr$(0))
GetHeader = CStr(Mid$(tmp2, 1, tmp - 1))
Case vbNullString
GetHeader = Buffer
Case Else
GetHeader = "0"
End Select
Else
GetHeader = "0"
End IfEnd Function
下面是我使用的代码:Option Explicit
Private Declare Function InternetOpen Lib "wininet" Alias "InternetOpenA" (ByVal sAgent As String, ByVal lAccessType As Long, ByVal sProxyName As String, ByVal sProxyBypass As String, ByVal lFlags As Long) As Long
Private Declare Function InternetCloseHandle Lib "wininet" (ByRef hInet As Long) As Long
Private Declare Function InternetReadFile Lib "wininet" (ByVal hFile As Long, sBuffer As Byte, ByVal lNumBytesToRead As Long, lNumberOfBytesRead As Long) As Integer
Private Declare Function InternetOpenUrl Lib "wininet" Alias "InternetOpenUrlA" (ByVal hInternetSession As Long, ByVal lpszUrl As String, ByVal lpszHeaders As String, ByVal dwHeadersLength As Long, ByVal dwFlags As Long, ByVal dwContext As Long) As Long
Private Declare Function HttpQueryInfo Lib "wininet.dll" Alias "HttpQueryInfoA" (ByVal hHttpRequest As Long, ByVal lInfoLevel As Long, ByVal sBuffer As Any, ByRef lBufferLength As Long, ByRef lIndex As Long) As Integer
Private Const INTERNET_OPEN_TYPE_PRECONFIG = 0
Private Const scUserAgent = "Tgwang"
Private Const INTERNET_OPEN_TYPE_DIRECT = 1
Private Const INTERNET_OPEN_TYPE_PROXY = 3
Private Const INTERNET_FLAG_RELOAD = &H80000000
Private mvarUrl As String
Private mvarSaveFile As String
Private mvarConnect As Boolean
Private hOpen As Long, hFile As Long
Private Buffer As String, BufLen As Long
Private RetQueryInfo As Boolean
Public Event GetData(Progress As Long) '下载进度
Public Event ErrMassage(Description As String) '错误信息
Public Event DownLoadOver()
Public Sub Execute() mvarConnect = True hOpen = InternetOpen(scUserAgent, INTERNET_OPEN_TYPE_DIRECT, vbNullString, vbNullString, 0) If mvarConnect = False Then
Cancel
Exit Sub
End If If hOpen = 0 Then
Cancel
RaiseEvent ErrMassage("无法创建连接")
mvarConnect = False
Else hFile = InternetOpenUrl(hOpen, mvarUrl, vbNullString, ByVal 0&, INTERNET_FLAG_RELOAD, ByVal 0&) If mvarConnect = False Then
Cancel
Exit Sub
End If If hFile = 0 Then
Cancel
RaiseEvent ErrMassage("无法连接服务器")
mvarConnect = False
Else
Buffer = Space$(1024)
BufLen = 1024
RetQueryInfo = HttpQueryInfo(hFile, 21, Buffer, BufLen, 0) If RetQueryInfo Then
Buffer = Mid$(Buffer, 1, BufLen)
Else
Buffer = ""
End If End If End IfEnd Sub
Public Function StartDownLoad() As Boolean Dim sBuffer(1 To 1024) As Byte, Ret As Long
Dim intfile As Long, LBR As Long
Dim i As Long
If mvarConnect = False Then
Cancel
StartDownLoad = False
Exit Function
End If On Error GoTo OutErr
Err.Clear
'If Dir$(mvarSaveFile) > " " Then
' Name mvarSaveFile As mvarSaveFile & ".bak"
'End If
intfile = FreeFile()
Open mvarSaveFile For Binary Access Write As #intfile
Do
InternetReadFile hFile, sBuffer(1), 1024, Ret
DoEvents
If Ret = 1024 Then
If mvarConnect = False Then
StartDownLoad = False
GoTo Quit
End If Put #1, , sBuffer
Else
For i = 1 To Ret
Put #1, , sBuffer(i)
DoEvents
Next i
End If
LBR = LBR + Ret
RaiseEvent GetData(LBR)
DoEvents
Loop Until Ret < 1024
RaiseEvent DownLoadOver
Quit:
Close #intfile
'if Dir$(mvarSaveFile & ".bak") > " " Then
' Kill mvarSaveFile
' Name mvarSaveFile & ".bak" As mvarSaveFile
'End If
Cancel Exit FunctionOutErr:
Err.Clear
Cancel
Close #intfile
RaiseEvent ErrMassage("文件" & mvarSaveFile & "正在使用,无法进行操作")
On Error GoTo 0End FunctionPublic Sub Cancel() mvarConnect = False
InternetCloseHandle hOpen
InternetCloseHandle hFileEnd SubPublic Property Let SaveFile(ByVal FileName As String) mvarSaveFile = FileNameEnd PropertyPublic Property Let URL(ByVal URL As String)
mvarUrl = URLEnd Property
Public Function GetHeader(Optional hdrName As String) As String Dim tmp As Long
Dim tmp2 As String If mvarConnect = False Then
GetHeader = "0"
Cancel
Exit Function
End If
If Buffer <> "" Then
Select Case UCase$(hdrName)
Case "CONTENT-LENGTH"
tmp = InStr(Buffer, "Content-Length")
tmp2 = Mid$(Buffer, tmp + 16, Len(Buffer))
tmp = InStr(tmp2, Chr$(0))
GetHeader = CStr(Mid$(tmp2, 1, tmp - 1))
Case "CONTENT-TYPE"
tmp = InStr(Buffer, "Content-Type")
tmp2 = Mid$(Buffer, tmp + 14, Len(Buffer))
tmp = InStr(tmp2, Chr$(0))
GetHeader = CStr(Mid$(tmp2, 1, tmp - 1))
Case "DATE"
tmp = InStr(Buffer, "Date")
tmp2 = Mid$(Buffer, tmp + 6, Len(Buffer))
tmp = InStr(tmp2, Chr$(0))
GetHeader = CStr(Mid$(tmp2, 1, tmp - 1))
Case "LAST-MODIFIED"
tmp = InStr(Buffer, "Last-Modified")
tmp2 = Mid$(Buffer, tmp + 15, Len(Buffer))
tmp = InStr(tmp2, Chr$(0))
GetHeader = CStr(Mid$(tmp2, 1, tmp - 1))
Case "SERVER"
tmp = InStr(Buffer, "Server")
tmp2 = Mid$(Buffer, tmp + 8, Len(Buffer))
tmp = InStr(tmp2, Chr$(0))
GetHeader = CStr(Mid$(tmp2, 1, tmp - 1))
Case vbNullString
GetHeader = Buffer
Case Else
GetHeader = "0"
End Select
Else
GetHeader = "0"
End IfEnd Function
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