Timeout for wininet

[Chris001]

Hi, I'm using the code below to download a very small text file from a server (maximum size of 500 bytes) into a string, because I rather not add the Inet control for something as simple as this.

If there are server problems the application hangs. The Inet control has "RequestTimeout" to set a timeout. If the data hasn't been downloaded within a certain time it shows an error that can be trapped.

Is it possible to set a timeout with wininet?

Option Explicit
Private Declare Function InternetOpen Lib "wininet.dll" 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 InternetOpenUrl Lib "wininet.dll" Alias "InternetOpenUrlA" (ByVal hInternetSession As Long, ByVal sURL As String, ByVal sHeaders As String, ByVal lHeadersLength As Long, ByVal lFlags As Long, ByVal lContext 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 InternetCloseHandle Lib "wininet.dll" (ByVal hInet As Long) As Integer
Private Declare Function DeleteUrlCacheEntry Lib "wininet.dll" (ByVal lpszUrlName As String) As Long
 
Public Const IF_FROM_CACHE = &H1000000
Public Const IF_MAKE_PERSISTENT = &H2000000
Public Const IF_NO_CACHE_WRITE = &H4000000
       
Private Const BUFFER_LEN = 256
 
 
Public Function GetUrlSource(sURL As String) As String
    Dim sBuffer As String * BUFFER_LEN, iResult As Integer, sData As String
    Dim hInternet As Long, hSession As Long, lReturn As Long
 
    DeleteUrlCacheEntry sURL
    
    'get the handle of the current internet connection
    hSession = InternetOpen("vb wininet", 1, vbNullString, vbNullString, 0)
    'get the handle of the url
    If hSession Then hInternet = InternetOpenUrl(hSession, sURL, vbNullString, 0, IF_NO_CACHE_WRITE, 0)
    'if we have the handle, then start reading the web page
    If hInternet Then
        'get the first chunk & buffer it.
        iResult = InternetReadFile(hInternet, sBuffer, BUFFER_LEN, lReturn)
        sData = sBuffer
        'if there's more data then keep reading it into the buffer
        Do While lReturn <> 0
            iResult = InternetReadFile(hInternet, sBuffer, BUFFER_LEN, lReturn)
            sData = sData + Mid(sBuffer, 1, lReturn)
        Loop
    End If
   
    'close the URL
    iResult = InternetCloseHandle(hInternet)
 
    GetUrlSource = sData
End Function

[Spetnik]

Sure, you can use WinHTTP.
Make sure to Reference "Microsoft WinHTTP Services" in your app.

Dim oRequest As WinHttp.WinHttpRequest
    
    Set oRequest = New WinHttp.WinHttpRequest
    
    oRequest.SetTimeouts lngResolveTimeout, lngConnTimeOut, lngSendTimeout, lngReceiveTimeout
    oRequest.Open "GET", "http://servername/filename.html"
    oRequest.Send
    GetUrlSource = oRequest.ResponseText