Is there any good example of http upload using WinInet c++ library

I cannot get my code to work :/

From stackoverflow

• Here's a quick example from Microsoft.

     static TCHAR hdrs[] =
        _T("Content-Type: application/x-www-form-urlencoded");
     static TCHAR frmdata[] =
        _T("name=John+Doe&userid=hithere&other=P%26Q");
    static LPSTR accept[2]={"*/*", NULL};
  
     // for clarity, error-checking has been removed
     HINTERNET hSession = InternetOpen("MyAgent",
        INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0);
     HINTERNET hConnect = InternetConnect(hSession, _T("ServerNameHere"),
        INTERNET_DEFAULT_HTTP_PORT, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 1);
     HINTERNET hRequest = HttpOpenRequest(hConnect, "POST",
        _T("FormActionHere"), NULL, NULL, accept, 0, 1);
     HttpSendRequest(hRequest, hdrs, strlen(hdrs), frmdata, strlen(frmdata));
     // close any valid internet-handles
  

  The example comes from here.

  michael : Thanx, but I still don't understand how can I upload a file (image) with that, how do I add image binaries to the POST body I thin it should contain multipart body, but how :/

• Eventually I found some working example on the web

  static char szRawData[5000];
    memset(szRawData, 0x11, sizeof(szRawData));
  
    //
    // CIHandle is just a wrapper class for HINTERNET, that closes handle in destructor
    //
    CIHandle hIntrn = InternetOpen( "LiveUpdate"), 
                                    INTERNET_OPEN_TYPE_PRECONFIG_WITH_NO_AUTOPROXY,
                                    NULL,
                                    NULL,
                                    0);
    if (!hIntrn)
      return printf("No Internet connection: %li.\n", GetLastError());
  
    CIHandle hConn = InternetConnect( hIntrn, 
                                      "65.254.250.104",
                                      INTERNET_DEFAULT_HTTP_PORT,
                                      NULL,
                                      NULL,
                                      INTERNET_SERVICE_HTTP,
                                      0,
                                      NULL);
    if (!hConn)
      return printf("Connection to update server failed: %li.\n", GetLastError());
  
    DWORD dwOpenRequestFlags = INTERNET_FLAG_IGNORE_REDIRECT_TO_HTTP |
                               INTERNET_FLAG_IGNORE_REDIRECT_TO_HTTPS |
                               INTERNET_FLAG_KEEP_CONNECTION |
                               INTERNET_FLAG_NO_AUTO_REDIRECT |
                               INTERNET_FLAG_NO_COOKIES |
                               INTERNET_FLAG_NO_CACHE_WRITE |
                               INTERNET_FLAG_NO_UI |
                               INTERNET_FLAG_RELOAD;
  
    CIHandle hReq = HttpOpenRequest(hConn,
                                    "POST",
                                    "upload.php",
                                    "HTTP/1.0",
                                    NULL,
                                    NULL,
                                    dwOpenRequestFlags,
                                    NULL);
  
    ZString strBoundary = "---------------------------autoupdater";
    ZString strContentHeader =  "Host: www.mydomain_at_powweb.com\r\n"
                                "Content-Type: multipart/form-data; boundary=";
    strContentHeader+=strBoundary;
  
    HttpAddRequestHeaders(hReq, strContentHeader, strContentHeader.length(), HTTP_ADDREQ_FLAG_ADD);
  
  
    ZString strHeaders;
    strHeaders.precache(16384);
    sprintf(strHeaders,
            "--%s\r\n"
            "Content-Disposition: form-data; name=\"userfile\"; "
            "filename=\"test.raw\"\r\n"
            "Content-Type: application/octet-stream\r\n\r\n",
            (LPCTSTR)strBoundary);
  
    tCharSeq s;//this is a just a dynamic array of bytes;
    //
    // append headers and file to request:
    //
    s.precache(16384);
    s.append(strHeaders.length(), strHeaders);
    //append with file data:
    s.append(2000, szRawData); //<------------------- depending on this size, SendRequest fails.
    //trailing end of data:
    s.append(4,"\r\n--");
    s.append(strBoundary.length(), (LPTSTR)strBoundary);
    s.append(4,"--\r\n");
  
    InternetSetOption(hReq, INTERNET_OPTION_USERNAME, "username\0", 9);
    InternetSetOption(hReq, INTERNET_OPTION_PASSWORD, "password\0", 9);
  
    if (!HttpSendRequest(hReq, NULL, 0, (void*)s.getBuffer(), s.length()))
      return printf("HttpSendRequest failed: %li.\n", GetLastError());