Calling web services
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Thread: Calling web services

  1. #1
    Join Date
    Jun 2006
    Posts
    143

    Calling web services

    I am trying to call a web service written in C# net using Wininet. The web service has been hosted in IIS. The web service url is /Trial/Service1.asmx and it has only the default HelloWorld method in it. I can access the web service via the browser by the url http://localhost/Trial/Service1.asmx . I can call the web service method HelloWorld using the Invoke button on the browser which we get on giving the url. But the app returns 400 ( Bad request ). If I use GET instead of POST I am getting 200 OK. But I need to use the POST method.


    What could be wrong?

    Here is the code I am using

    //m_lpOutBuffer is a DWORD data member and initialized with 0.

    Code:
    {    
        
    
        CString csSoapString;
        csSoapString = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>";
        csSoapString += "<soap:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" ";
         csSoapString += "xmlns:xsd=\"http://www.w3.org/2001/XMLSchema \"";
        csSoapString += "xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\">";
         csSoapString += "<soap:Body>";
        csSoapString += "<HelloWorld xmlns:m=\"http://tempuri.org/\"/>";
        csSoapString += "</soap:Body>";
         csSoapString += "</soap:Envelope>"; 
    
        LPTSTR AcceptTypes[2] = {TEXT("text/xml"), NULL};
    
        DWORD dwFlags = INTERNET_FLAG_NO_CACHE_WRITE |INTERNET_FLAG_KEEP_CONNECTION;
    
         HINTERNET hNet = InternetOpen(L"", INTERNET_OPEN_TYPE_PRECONFIG,
                                            NULL, NULL, 0 );
    
    
        if (hNet)
        {
            HINTERNET hSession = InternetConnect(hNet, _T("localhost"),
                                                  INTERNET_DEFAULT_HTTP_PORT,
                                                 _T(""),
                                                 _T(""), INTERNET_SERVICE_HTTP, 0, 0);
    
            if (hSession)
            {
                hRequest = HttpOpenRequest(hSession, _T("POST"), 
                                           _T("/Trial/Service1.asmx"),
                                           _T("HTTP/1.1"),NULL,
                                            (LPCTSTR*)AcceptTypes, dwFlags, 0);
    
                if (hRequest)
                {
                    int nContentLength = csSoapString.GetLength();
                    CString csLength;
                     csLength.Format( _T( "%d" ),nContentLength );
                    CString csSoapAction;
                    
                    csSoapAction += _T("Content-Type: text/xml;charset=utf-8\r\n");
                     csSoapAction += _T( "Content-Length: ");
                    csSoapAction += csLength;
                    csSoapAction += _T("SOAPAction: \"" );
                    csSoapAction += _T("http://tempuri.org/HelloWorld");
                     csSoapAction += _T("\"\0\r\n\r\n");    
    
                    BOOL bSent = HttpSendRequest(hRequest, ( LPCTSTR )csSoapAction, csSoapAction.GetLength(), (LPVOID )(LPCTSTR)csSoapString, csSoapString.GetLength());
    
                     DWORD dwBufferSize = 0;
                    m_lpOutBuffer = 0;
    
                   // read the reponse
                    ReadQueryResponse ( HTTP_QUERY_RAW_HEADERS_CRLF, dwBufferSize );
    
                    TCHAR* pLBuffer = (TCHAR* )m_lpOutBuffer;
                     CString csStatusCode( pLBuffer, dwBufferSize + 1 );
                    DWORD dwRetVal = _wtol((TCHAR*)(LPCTSTR)csStatusCode);
                    int nReponseSize = _tcslen( pLBuffer );
    
                    if( 0 == nReponseSize )
                     {
                        return;
                    }
                    CString csResposeHeader( pLBuffer, nReponseSize );
                    OutputDebugString( csResposeHeader ); // shows 400( bad request )
                }
            }
         }
    }
    
    bool CWinInet_ClientDlg::ReadQueryResponse( UINT uQueryLevel, DWORD& dwBufferSize )
    {
        try
        {
            if( !HttpQueryInfo( hRequest, uQueryLevel,(LPVOID)m_lpOutBuffer, &dwBufferSize, 0 ))
             {
                DWORD dwErrorCode = GetLastError();
                // If buffer size is not sufficient, call QueryInfo() with the new buffer size.
                if( ERROR_INSUFFICIENT_BUFFER == dwErrorCode  )
                 {
                    if( 0 != m_lpOutBuffer )
                    {
                        delete[] m_lpOutBuffer;
                        m_lpOutBuffer = 0;
                    }
                    m_lpOutBuffer = new char[dwBufferSize];
                     if( 0 == m_lpOutBuffer )
                    {
    
                        return false;
                    }
                    return ReadQueryResponse( uQueryLevel,dwBufferSize );
                 }
                else if( dwErrorCode == ERROR_HTTP_HEADER_NOT_FOUND )
                {
                    return false;
                }
             }
            return true;
        }
        catch( ... )
        {        
            return false;
        }
    }

    Thanks in advance.

  2. #2
    Join Date
    Nov 2003
    Location
    Belgium
    Posts
    8,060

    Re: Calling web services

    What platform do you need to support?
    In Windows 7, it might be easier to use the Windows Web Services API (WWSAPI), see http://www.codeguru.com/cpp/com-tech...ices-C-API.htm .

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