C / C++ / MFC

BOOL UseHttpSendReqEx(HINTERNET hConnect, TCHAR *upFile)
   {
     INTERNET_BUFFERS BufferIn = {0};
     DWORD dwBytesRead;
     DWORD dwBytesWritten;
     BYTE pBuffer[1024]; // Read from file in 1K chunks
     BOOL bRead, bRet;

     BufferIn.dwStructSize = sizeof( INTERNET_BUFFERS );

     HINTERNET hRequest = HttpOpenRequest (hConnect, "PUT",
         "/test/page.htm", NULL, NULL, NULL,  0, 0);
     if (!hRequest)
     {
       printf("Failed to open request handle: %lu\n", GetLastError ());
       return FALSE;
     }

     HANDLE hFile = CreateFile (upFile, GENERIC_READ, FILE_SHARE_READ,
         NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
     if (hFile == INVALID_HANDLE_VALUE)
     {
       printf("\nFailed to open local file %s.", upFile);
       return FALSE;
     }

     BufferIn.dwBufferTotal = GetFileSize (hFile, NULL);
     printf ("File size is %d\n", BufferIn.dwBufferTotal );

     if(!HttpSendRequestEx( hRequest, &BufferIn, NULL, HSR_INITIATE, 0))
     {
       printf( "Error on HttpSendRequestEx %lu\n",GetLastError() );
       return FALSE;
     }

     DWORD sum = 0;
     do
     {
       if  (!(bRead = ReadFile (hFile, pBuffer, sizeof(pBuffer),
           &dwBytesRead, NULL)))
       {
         printf ("\nReadFile failed on buffer %lu.",GetLastError());
         break;
       }
       if (!(bRet=InternetWriteFile( hRequest, pBuffer, dwBytesRead,
           &dwBytesWritten)))
       {
         printf ("\nInternetWriteFile failed %lu", GetLastError());
         break;
       }
       sum += dwBytesWritten;
     }
     while (dwBytesRead == sizeof(pBuffer)) ;

     CloseHandle (hFile);
     printf ("Actual written bytes: %d\n", sum);

     if(!HttpEndRequest(hRequest, NULL, 0, 0))
     {
       printf( "Error on HttpEndRequest %lu \n", GetLastError());
       return FALSE;
     }
     return TRUE;
   } 

bool predicateFunction(const CMyStruct& a, const CMyStruct& b)
{
  return (a is somehow less than b);
}

vector <CMyStruct> vec;
...
std::sort(vec.begin(), vec.end(), predicateFunction);