POST 방식으로 웹페이지 호출해서 결과값 얻어오기.

LPBYTE PostWebPage( LPCTSTR pszURL , LPBYTE pbPostData )
{
 int     result;
 DWORD    dwLength;
 int     nContentLength;
 BYTE    baBuffer[ 64 ];
 DWORD    dwServiceType;
 INTERNET_PORT  nPort;
 HINTERNET   hInternet = NULL;
 HINTERNET   hConnect = NULL;
 HINTERNET   hRequest = NULL;
 CString    sServer, sObject;
 CString    strHeaders = _T( "Content-Type: application/x-www-form-urlencoded" );
 LPBYTE    pbContent = NULL;
 CString    sLicenseXML;
 LPSTR    pszFirst = NULL, pszLast = NULL;
 CString sLog ;
 DWORD dwFlags = 0 ;
 CString ss;
 //
 // URL 호출
 //
 hInternet = InternetOpen( _T( "Mozilla" ), INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0 );
 if( hInternet == NULL )
 {
  result = GetLastError();
  goto finish;
 }
 result = AfxParseURL( pszURL, dwServiceType, sServer, sObject, nPort );
 if( result == FALSE )
 {
  result = GetLastError();
  goto finish;
 }


 hConnect = InternetConnect( hInternet, sServer, nPort, NULL, NULL, INTERNET_SERVICE_HTTP, 0, NULL );
 if( hConnect == NULL )
 {
  result = GetLastError();
  goto finish;
 }

 //
 // 반드시 포스트 방식으로
 //
 hRequest = HttpOpenRequest( hConnect, _T( "POST" ), sObject, NULL, NULL, NULL,INTERNET_FLAG_NO_CACHE_WRITE  , NULL );
 if( hRequest == NULL )
 {
  result = GetLastError();
  goto finish;
 }

 //
 // 웹서버에 데이타를 전송
 //
 result = HttpSendRequest( hRequest, strHeaders, strHeaders.GetLength(), (LPVOID)pbPostData, strlen( (LPSTR)pbPostData ) );
 if( result == FALSE )
 {
  result = GetLastError();

  goto finish;
 }

 //
 // HTTP STATUS 코드
 //
 dwLength = sizeof( baBuffer );
 result = HttpQueryInfo( hRequest, HTTP_QUERY_STATUS_CODE, (LPVOID)baBuffer, &dwLength, NULL );
 if( result == FALSE )
 {
  result = GetLastError();
  goto finish;
 }

 if( strcmp( (LPCSTR)baBuffer, "200" ) != 0 )
 {
  //
  // HTTP Request 가 실패했다. 왜???
  //
  //CString  s = (LPCSTR)baBuffer;
  result = ERROR_HTTP_INVALID_QUERY_REQUEST;
  goto finish;
 }

 dwLength = sizeof( baBuffer );
 result = HttpQueryInfo( hRequest, HTTP_QUERY_CONTENT_LENGTH , (LPVOID)baBuffer, &dwLength, NULL );
 if( result == FALSE )
 {
  result = GetLastError();
  goto finish;
 }

 nContentLength = atoi( (LPSTR)baBuffer );
 pbContent = new BYTE[ nContentLength + 1 ];
 if( pbContent == NULL )
 {
  result = ERROR_NOT_ENOUGH_MEMORY;
  goto finish;
 }

 result = InternetReadFile( hRequest, pbContent, nContentLength, &dwLength );
 if( result == FALSE )
 {
  result = GetLastError();
  goto finish;
 }

 pbContent[ nContentLength ] = '\0';
 result = 0;
finish:
 if( hInternet != NULL )
  InternetCloseHandle( hInternet );
 if( hConnect != NULL )
  InternetCloseHandle( hConnect );
 if( hRequest != NULL )
  InternetCloseHandle( hRequest );

 return pbContent;
}


사용방법은 아래와 같이...

LPBTYEpbPostData = new BYTE[ 512 ];
CString strRes;
memset( pbPostData, 0, sizeof( BYTE ) * 512 );
sprintf( (char*)pbPostData, "id=%s&pw=%s", loginDlg.GetID(), strPass64 );

strRes = PostWebPage( 웹주소, pbPostData );

strRes에 Post방식으로 날린 웹페이지의 응답값이 들어온다. LPBYTE형을 리턴하지만, 자동형변환 되어 들어간다.