计算机二级C技巧:VC6调用WebService
来源:优易学  2010-1-14 11:32:54   【优易学:中国教育考试门户网】   资料下载   IT书店
  下面是个控制台的样例
  Toolkit3.0 终于给出VC6的样例了,1.0只能看到VB和ASP的
  #include <stdio.h>
  #import "msxml4.dll"
  using namespace MSXML2;
  #import "C:\Program Files\Common Files\MSSoap\Binaries\mssoap30.dll" \
  exclude("IStream", "IErrorInfo", "ISequentialStream", "_LARGE_INTEGER", \
  "_ULARGE_INTEGER", "tagSTATSTG", "_FILETIME")
  using namespace MSSOAPLib30; //你机器得安装SOAP Toolkit3.0 ,1.0时,用using namespace时报错
  void Add()
  {
  ISoapSerializerPtr Serializer;
  ISoapReaderPtr Reader;
  ISoapConnectorPtr Connector;
  // Connect to the service.
  Connector.CreateInstance(__uuidof(HttpConnector30)); //HttpConnector30 失败,无法这样创建Connector,CXX0017 Error :Symbol “HttpConnector30“ not found(摇头、叹气!)
  Connector->Property["EndPointURL"] = "http://MyServer/Soap3DocSamples/DocSample1/Server/DocSample1.wsdl"; //这个当然得改成您自己的拉
  Connector->Connect();
  // Begin the message.
  //Connector->Property["SoapAction"] = "uri:AddNumbers";
  Connector->Property["SoapAction"] = "http://tempuri.org/DocSample1/action/Sample1.AddNumbers";
  Connector->BeginMessage();
  // Create the SoapSerializer object.
  Serializer.CreateInstance(__uuidof(SoapSerializer30));
  // Connect the serializer object to the input stream of the connector object.
  Serializer->Init(_variant_t((IUnknown*)Connector->InputStream));
  // Build the SOAP Message.
  Serializer->StartEnvelope("","","");
  Serializer->StartBody("");
  Serializer->StartElement("AddNumbers","http://tempuri.org/DocSample1/message/","",""); //这是本地的Web Services,实际中要指定命名空间
  Serializer->StartElement("NumberOne","","","");
  Serializer->WriteString("5");
  Serializer->EndElement();
  Serializer->StartElement("NumberTwo","","","");
  Serializer->WriteString("10");
  Serializer->EndElement();
  Serializer->EndElement();
  Serializer->EndBody();
  Serializer->EndEnvelope();
  // Send the message to the XML Web service.
  Connector->EndMessage();
  // Read the response.
  Reader.CreateInstance(__uuidof(SoapReader30));
  // Connect the reader to the output stream of the connector object.
  Reader->Load(_variant_t((IUnknown*)Connector->OutputStream), "");
  // Display the result.
  printf("Answer: %s\n", (const char*)Reader->RpcResult->text);
  }
  int main()
  {
  CoInitialize(NULL);
  Add();
  CoUninitialize();
  return 0;
  }
  更改 EndPointURL 属性的值. 在URL里指定你的服务器名.
  OK
  总结一下必要的关键步骤
  1.导入类型库
  2.需要创建一个SoapConnector
  3.下一步创建SoapSerializer
  4.下一步把消息附加到SoapConnector的输入流
  5.下一步读取结果.要读取服务器的回复,客户端应用需要使用SoapReader,
  6.SoapReader被连接到SoapConnector输出流
  7.用IXMLDOMElement对象可以从SoapReader里读到服务器的回复。

责任编辑:cyth

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