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TIP: WinInet Wrapper Module

  • September 19, 2002
  • By Sam Huggill
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This module is called modWinInet.bas. Use the SplitAddr() function to get the address in the correct format for PostInfo.

Option Explicit

'Author:    Sam Huggill
'Email:     

Private Declare Function _
   InternetOpen Lib "wininet.dll" _
 Alias "InternetOpenA" _
  (ByVal lpszCallerName As String, _
   ByVal dwAccessType As Long, _
   ByVal lpszProxyName As String, _
   ByVal lpszProxyBypass As String, _
   ByVal dwFlags As Long) As Long

 Private Declare Function InternetConnect Lib "wininet.dll" _
   Alias "InternetConnectA" _
   (ByVal hInternetSession As Long, _
    ByVal lpszServerName As String, _
    ByVal nProxyPort As Integer, _
    ByVal lpszUsername As String, _
    ByVal lpszPassword As String, _
    ByVal dwService As Long, _
    ByVal dwFlags As Long, _
    ByVal dwContext As Long) As Long

 Private Declare Function InternetReadFile Lib "wininet.dll" _
   (ByVal hFile As Long, _
    ByVal sBuffer As String, _
    ByVal lNumBytesToRead As Long, _
    lNumberOfBytesRead As Long) As Integer

 Private Declare Function HttpOpenRequest Lib "wininet.dll" _
    Alias "HttpOpenRequestA" _
    (ByVal hInternetSession As Long, _
     ByVal lpszVerb As String, _
     ByVal lpszObjectName As String, _
     ByVal lpszVersion As String, _
     ByVal lpszReferer As String, _
     ByVal lpszAcceptTypes As Long, _
     ByVal dwFlags As Long, _
     ByVal dwContext As Long) As Long

 Private Declare Function HttpSendRequest Lib "wininet.dll" _
  Alias "HttpSendRequestA" _
  (ByVal hHttpRequest As Long, _
   ByVal sHeaders As String, _
   ByVal lHeadersLength As Long, _
   ByVal sOptional As String, _
   ByVal lOptionalLength As Long) As Boolean

 Private Declare Function InternetCloseHandle Lib "wininet.dll" _
  (ByVal hInternetHandle As Long) As Boolean

 Private Declare Function HttpAddRequestHeaders Lib "wininet.dll" _
   Alias "HttpAddRequestHeadersA" _
   (ByVal hHttpRequest As Long, _
    ByVal sHeaders As String, _
    ByVal lHeadersLength As Long, _
    ByVal lModifiers As Long) As Integer


Public Function PostInfo$(srv$, script$, postdat$)

  Dim hInternetOpen As Long
  Dim hInternetConnect As Long
  Dim hHttpOpenRequest As Long
  Dim bRet As Boolean
  
  hInternetOpen = 0
  hInternetConnect = 0
  hHttpOpenRequest = 0
  
  'Use registry access settings.
  Const INTERNET_OPEN_TYPE_PRECONFIG = 0
  hInternetOpen = InternetOpen("http generic", _
                  INTERNET_OPEN_TYPE_PRECONFIG, _
                  vbNullString, _
                  vbNullString, _
                  0)
  
  If hInternetOpen <> 0 Then
     'Type of service to access.
     Const INTERNET_SERVICE_HTTP = 3
     Const INTERNET_DEFAULT_HTTP_PORT = 80
     'Change the server to your server name
     hInternetConnect = InternetConnect(hInternetOpen, _
                        srv$, _
                        INTERNET_DEFAULT_HTTP_PORT, _
                        vbNullString, _
                        "HTTP/1.0", _
                        INTERNET_SERVICE_HTTP, _
                        0, _
                        0)
  
     If hInternetConnect <> 0 Then
      'Brings the data across the wire even if it locally cached.
       Const INTERNET_FLAG_RELOAD = &H80000000
       hHttpOpenRequest = HttpOpenRequest(hInternetConnect, _
                           "POST", _
                           script$, _
                           "HTTP/1.0", _
                           vbNullString, _
                           0, _
                           INTERNET_FLAG_RELOAD, _
                           0)
  
        If hHttpOpenRequest <> 0 Then
           Dim sHeader As String
           Const HTTP_ADDREQ_FLAG_ADD = &H20000000
           Const HTTP_ADDREQ_FLAG_REPLACE = &H80000000
  sHeader = "Content-Type: application/x-www-form-urlencoded" _
             & vbCrLf
           bRet = HttpAddRequestHeaders(hHttpOpenRequest, _
             sHeader, Len(sHeader), HTTP_ADDREQ_FLAG_REPLACE _
             Or HTTP_ADDREQ_FLAG_ADD)
  
           Dim lpszPostData As String
           Dim lPostDataLen As Long
  
           lpszPostData = postdat$
           lPostDataLen = Len(lpszPostData)
           bRet = HttpSendRequest(hHttpOpenRequest, _
                  vbNullString, _
                  0, _
                  lpszPostData, _
                  lPostDataLen)
  
           Dim bDoLoop             As Boolean
           Dim sReadBuffer         As String * 2048
           Dim lNumberOfBytesRead  As Long
           Dim sBuffer             As String
           bDoLoop = True
           While bDoLoop
            sReadBuffer = vbNullString
            bDoLoop = InternetReadFile(hHttpOpenRequest, _
               sReadBuffer, Len(sReadBuffer), lNumberOfBytesRead)
            sBuffer = sBuffer & _
                 Left(sReadBuffer, lNumberOfBytesRead)
            If Not CBool(lNumberOfBytesRead) Then bDoLoop = False
           Wend
           PostInfo = sBuffer
           bRet = InternetCloseHandle(hHttpOpenRequest)
        End If
        bRet = InternetCloseHandle(hInternetConnect)
     End If
     bRet = InternetCloseHandle(hInternetOpen)
  End I

nd Function Public Sub SplitAddr(ByVal addr$, srv$, script$) 'Inputs: The full url including http:// ' Two variables that will be changed ' 'Returns: Splits the addr$ var into the server name ' and the script path Dim i% i = InStr(addr$, "/") srv$ = Mid(addr$, i + 2, Len(addr$) - (i + 1)) i = InStr(srv$, "/") script$ = Mid(srv$, i, Len(srv$) + 1 - i) srv$ = Left$(srv$, i - 1) End Sub






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