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Joel on Software

Problem in FTP connection behind proxy

Hello,

I'm trying to write a function that connect to an FTP sever via a proxy.
I use the following code :

lgSession = InternetOpen("FTP connection", INTERNET_OPEN_TYPE_PROXY, proxyname, vbNullString, 0)
If lgSession Then
    lgInternet = InternetOpenUrl (lgSession, "ftp://servername/filename.doc", vbNullString, 0, INTERNET_FLAG_NO_CACHE_WRITE, 0)
    If lgInternet Then
        Do
            inRes = InternetReadFile(lgInternet, stBuf, 1024, lgRet)
        Loop While (lgRet <> 0)
    End If
        inRes = InternetCloseHandle(lgInternet)

But, i have always variable "inRes" equal to zero.
When I use explorer with ftp://servername/filename.doc, the file is downloaded correctly, but when using the code, no success to read the file.
Anybody know the problem.
Many thanks!!

Philippe arnaud
Tuesday, November 23, 2004

Not sure what the API calls mean, but if you're setting up a default FTP connection, you may very well get proxy problems when the remote host tries to establish the FTP data channel back to your machine.

If this is the case,  you could try setting up a passive FTP connection. I'm not sure what the appropriate API calls are for this, but it should be apparent from the documentation

Using passive FTP means that there is no separate data channel. All data moves through the control channel established outbound from your machine.

If you can surf, this should work. Unless the FTP port is blocked.....

Hope it helps

Henrik Sidebäck
Tuesday, November 30, 2004

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