MFC Application that post data to a CGI.

Posted on 1998-04-14
Last Modified: 2013-11-20
CHttpFile::SendRequest and it's siblings (AddRequestHeaders, OpenRequest) are not behaving.  I am trying to POST to a CGI script FORMMAIL from inside of an MFC program (so users could update statistics, place orders, etc) and am
getting all sorts of failures.  Here is what I am trying to do:

const TCHAR szHeaders[] = _T("Accept: text/plain\r\nUser-Agent: POST

if (!AfxParseURL(host, dwServiceType, strServerName, strObject, nPort) ||
    m_OutPut += "!AfxParseUrl";

   try {
    pServer = session.GetHttpConnection(strServerName, nPort);
   catch (CInternetException* pEx) {
    pServer = NULL;

   pFile = pServer->OpenRequest(CHttpConnection::HTTP_VERB_POST, strObject,
NULL, 1, NULL, NULL, dwHttpRequestFlags);
   pFile->SendRequest(NULL, (ULONG )0, (void *)(LPTSTR)(LPCTSTR)data,

The script is named, and takes two inputs user and message (inside
of the script I break a part the messages)

I tried to do the assignments like this:

host = http://eudoxus/cgi-bin/
data = ?name=matt&message=This+is+a+test

But it's not working.

Anyone can come out with a source-code can earn my 200 points. I've written some sample code. You just modify from it. Or you can just write you own simple MFC programme to do a POST using any public cgi program. Thanks.
Question by:skidz
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LVL 12

Expert Comment

ID: 1317741

Expert Comment

ID: 1317742
Sorry, I dont give away code...

If you want to I can point you to some articles in the
Microsoft knowdelge base that adres the "posting from an
application" issue.
LVL 11

Accepted Solution

mikeblas earned 200 total points
ID: 1317743
// compile me for debug with:
//       cl /Zi /MTd doit.cpp
// compile me for release with:
//      cl /MT doit.cpp

#include <afx.h>
#include <afxwin.h>
#include <afxinet.h>
#include <iostream>

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;

CWinApp theApp;

using namespace std;

CString strHeaders =
      "Content-Type: application/x-www-form-urlencoded\r\n\r\n";

int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
   int nRetCode = 0;

   //REVIEW: this app does no error-checking whatsoever

   if (!AfxWinInit(::GetModuleHandle(NULL), NULL, ::GetCommandLine(), 0))
      cerr << _T("Fatal Error: MFC initialization failed") << endl;
      nRetCode = 1;
      CInternetSession sess("YourAgent");

      CHttpConnection* pConnection = sess.GetHttpConnection("");
      CHttpFile *pFile = NULL;
      pFile = pConnection->OpenRequest("POST", "/jobseek/inputinitial.cfm");

      CString strPost(
      pFile->SendRequest(strHeaders, (LPVOID)(LPCTSTR) strPost, strPost.GetLength());

      CString str;
      while (pFile->ReadString(str))
         cout << (LPCTSTR) str;
         cout << endl;

      delete pFile;

   return nRetCode;

The thing that's wrong with your code, certainly, is that your "data" contains a leading question mark ('?'). It's not necessary for you to supply the question mark; it's up to WININET.DLL to do that.

Since you ask a very vague question (eg, "It's not working"), and we don't know exactly what the server-side component is expecting to receive, my answer is a real shot in the dark. But the most likely problem is that you didn't include a Content-Type: header on your request, and the server is summarily rejecting your request because it's the wrong content type.

Another likely problem is that you don't have all the required parameters; maybe you're not providing values for hidden fields, for instance, or setting other headers that your server-side software requires.

.B ekiM


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