HTTP方式傳送SOAP請求(VC)
在VC中呼叫Web Servers介面常用有兩種方法:
一種是利用Microsoft SOAP Toolkit,但這個必須要另外按裝.
第二種可以利用VC的winnet.h中的相關類,自已組裝SOAP請求.
第一種方法網上較多,可以百度"SOAP HTTP VC",但第一種方法對於理解web servers介面更好所以選用了第一種.
主要用到的類 : CInternetSession,CHttpConnection CHttpFile
程式碼:
請求Web servers介面需要有請求的URL(m_strServer)地址及介面所在的名空間(m_strNameSpace).
//step1:構造HTTP請求頭部.
strHeader.Format("Content-Type: text/xml; charset=\"UTF-8\"\r\n"
"SOAPAction: \"%s%s\"\r\n", m_strNameSpace, strMethod );
這兩個欄位都是必須的,按HTTP協議頭部的各段之間用換行隔開,POST 欄位會在後面建立連線的時候加上去.
//step2:構造HTTP請求訊息體:
這裡面每個節點的形式都是XXX:YYY其中XXX是名字空間變數(跟C++的域運算子作用相當了),其值在後面的屬性中給出,YYY是真正的節點名.例如:一開始的<SOAP:Envelope ..>SOAP是名字空間變數,其值在後面的屬性給出: "xmlns:SOAP=\"
其中在介面方法名中引入了自已的名字空間: strMethodBegin.Format( "<RECENTCONTACT:%s xmlns:RECENTCONTACT=\"%s\" >", strMethodName , m_strNameSpace);
strMethodEnd.Format( "</RECENTCONTACT:%s>", strMethodName );同理"RECENTcONTACT"可隨便替換.
strSoapXML += "<SOAP:Body>";
CString strMethodBegin, strMethodEnd;
CString strParam;
strMethodBegin.Format( "<RECENTCONTACT:%s xmlns:RECENTCONTACT=\"%s\" >", strMethodName , m_strNameSpace);
strMethodEnd.Format( "</RECENTCONTACT:%s>", strMethodName );
strSoapXML += strMethodBegin;
for ( int i=0; i<nCount; i++ )
{
strParam.Format( "<RECENTCONTACT:in%d xsi:type=\"xsd:%s\">%s</RECENTCONTACT:in%d>",
i, pParam[i].strType, pParam[i].strValue, i );
strSoapXML += strParam;
}
strSoapXML += strMethodEnd;
strSoapXML += "</SOAP:Body>"
"</SOAP:Envelope>";
//step3:傳送請求
CInternetSession m_internetSession;
CHttpConnection *m_pHttpConnect=NULL;
CHttpFile *m_pHttpFile=NULL;
try
{
m_pHttpConnect = m_internetSession.GetHttpConnection( m_strServer, m_uPort );
m_pHttpFile= m_pHttpConnect->OpenRequest( CHttpConnection::HTTP_VERB_POST, m_strObj ); //這裡會在頭部加入POST欄位.
if( !m_pHttpFile->AddRequestHeaders( strHeaders , HTTP_ADDREQ_FLAG_COALESCE | HTTP_ADDREQ_FLAG_ADD_IF_NEW) )
{
DWORD dw;
dw=GetLastError();
dw=GetLastError();
}
m_pHttpFile->SendRequestEx( strBody.GetLength(), HSR_SYNC | HSR_INITIATE );
m_pHttpFile->Write( strBody, strBody.GetLength() );
m_pHttpFile->EndRequest( HSR_SYNC );
//讀取返回值
DWORD dwHttpStatus;
if (!m_pHttpFile->QueryInfoStatusCode(dwHttpStatus))
{
dwHttpStatus = 200;
}
DWORD dwResponseLength = m_pHttpFile->GetLength();
while (0 != dwResponseLength )
{
char *szResponse = new char[dwResponseLength + 1];
szResponse[dwResponseLength] = '\0';
m_pHttpFile->Read(szResponse, dwResponseLength);
strRt += szResponse;
delete[] szResponse;
dwResponseLength = m_pHttpFile->GetLength();
}
}
catch( CInternetException )
{
.....
return strRt;
}
catch (CException* e)
{
...
return strRt;
}
m_pHttpFile->Close();
m_pHttpConnect->Close();
m_internetSession.Close();
return strRt;
程式碼均從函式中獲取,不能直接使用.