How to call SOAP web service in vc++ win32 project DLL?

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SOAP

VC++

I am created illustrator plugin in c++. I want to call SOAP web service in plugin.
i am trying bellow code but not getting responce.

What I have tried:

IServerXMLHTTPRequestPtr pXMLHTTPReq = NULL;
		hr=pXMLHTTPReq.CreateInstance(__uuidof(ServerXMLHTTP60));

		hr = pXMLHTTPReq->open("POST","http://localhost/Service1.asmx",false,"","");
		hr = pXMLHTTPReq->setRequestHeader("Content-Type", "text/xml; charset=utf-8");
		hr = pXMLHTTPReq->setRequestHeader("SOAPAction", "http://tempuri.org/ValidateIllustratorUser");

		string strSoapEnvelope = "";
		strSoapEnvelope = "";
		strSoapEnvelope += "<soap:envelope";
 strsoapenvelope="" +="xmlns:xsi=\" http:="" www.w3.org="" 2001="" xmlschema-instance\"";
="" http="" :="" xmlschema\"";
="" schemas.xmlsoap.org="" soap="" envelope="" \"="">";
		strSoapEnvelope += "<soap:body>";
		strSoapEnvelope += "<validateillustratoruser xmlns="\"http://tempuri.org/\"">";
		strSoapEnvelope += "<userid>A";
		strSoapEnvelope += "<password>A";
		strSoapEnvelope += "";
		strSoapEnvelope += "";
		strSoapEnvelope += "";
		hr = pXMLHTTPReq->send(&strSoapEnvelope);
	
		string outXML = pXMLHTTPReq->responseText;