The DetectAutoProxyUrl function identifies the auto-config script location -- Visual FoxPro : Using Win32 (WinAPI) Functions


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The DetectAutoProxyUrl function identifies the auto-config script location

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Before you begin:

Citing from the WLUG Wiki:
Internet Explorer has an [x] Automatically detect settings check box. This will cause the browser to search for the configuration file.

If your DomainName is machine.something.meta.net.nz then InternetExplorer will request the following urls until it finds a WPAD configuration file.



http://wpad.something.meta.net.nz/wpad.dat 

http://wpad.meta.net.nz/wpad.dat 

http://wpad.net.nz/wpad.dat 

http://wpad.nz/wpad.dat

WPAD stands for Web Proxy Auto-Discovery.

 
DO decl
 
LOCAL lcRmScript, lcLocal
lcRmScript = Repli(Chr(0), 250)
 
* dwDetectFlags = 1, 2
* PROXY_AUTO_DETECT_TYPE_DHCP
* PROXY_AUTO_DETECT_TYPE_DNS_A
IF DetectAutoProxyUrl(@lcRmScript, Len(lcRmScript), 2) = 0
    WAIT WINDOW NOWAIT "Not detected. "
    RETURN
ENDIF
 
lcRmScript = STRTRAN(lcRmScript, Chr(0), "")
 
IF Not EMPTY(lcRmScript)
    = MessageB("Location of a WPAD autoproxy script:     " +;
        Chr(13)+Chr(13) + lcRmScript, 64, " DetectAutoProxyUrl")
 
    WAIT WINDOW NOWAIT "Donwloading from URL... "
    lcLocal = SYS(2003) + "\autoscript.txt"
    URLDownloadToFile(0, lcRmScript, lcLocal, 0,0)
    WAIT WINDOW NOWAIT "Downloaded from " + lcRmScript + "   "
 
    IF FILE(lcLocal)
        MODI FILE (lcLocal) NOMODI NOWAIT
    ENDIF
ENDIF
* end of main
 
PROCEDURE decl
    DECLARE INTEGER GetLastError IN kernel32
 
    DECLARE INTEGER DetectAutoProxyUrl IN wininet;
        STRING @lpszAutoProxyUrl, LONG dwAutoProxyUrlLength,;
        LONG dwDetectFlags
 
    DECLARE INTEGER URLDownloadToFile IN urlmon;
        INTEGER pCaller, STRING szURL, STRING szFileName,;
        INTEGER dwReserved, INTEGER lpfnCB

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1094 bytes
Created: 2002-11-13 14:03:10
Modified: 2009-01-03 15:26:33
Visits in 7 days: 106

Listed functions:

DetectAutoProxyUrl
GetLastError
URLDownloadToFile

My comment:

An example of WPAD.DAT file:



function FindProxyForURL(url, host)

{

        // We only cache http and ftp

        if (url.substring(0, 5) == "http:" || url.substring(0, 4) == "ftp:")

                return "PROXY cache:8080; DIRECT";



        // Otherwise use direct connection

        return "DIRECT";

}

#kwd: sln_http.

Word Index links for this example:

WPAD configuration file

Explorer

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