下面是我转过来的。

     这两天在做短信接入的程序开发。双方开发完后进行测试，java开发的客户端，访问.NET的Web Services时，过一段时间就会失败。于是用VC+MS SOAP toolkits3做了个客户端来模拟一下，以查找到底是客户端还是服务端的问题。结果发现VC的客户端访问的时候就没有成功过，而访问java开发的Web Services确没有问题。很怪异，上网查资料有人说是.NET的bug等等，反正是没有解决的方法。在CSDN上发帖子提问也是没有人回答。
研究了两天，快要准备放弃.NET改用gsoap的时候，发现csdn上有人回帖了。照着试了试果然可以了。

原来的vc代码如下：
ISoapSerializerPtr Serializer;
ISoapReaderPtr Reader;
ISoapConnectorPtr Connector;
CString strResult;

CString strUserName("xfqd");
CString strPassword("xfqd321");
CString strSRC_ID("16808");
CString strDest("xxxxxx");
CString strFee("xxxxxx");
CString strLinkid("adfasdfasdf");
CString strServiceId("bz");
int nArea=371;
int MO_ID = 10;
CString strContent("adb");
int nTimes=0;
// Connect to the service
try
{
   Connector.CreateInstance(__uuidof(HttpConnector30));  
  
   Connector->Property["EndPointURL"] = "http://192.168.1.55:1478/GGAPI/service.asmx";  
   Connector->Connect();
  
  
   // Begin message
   Connector->Property["SoapAction"] = "http://guoguang.net/SendMessage";
   Connector->BeginMessage();
  
   // Create the SoapSerializer
   Serializer.CreateInstance(__uuidof(SoapSerializer30));
  
   // Connect the serializer to the input stream of the connector
   Serializer->Init(_variant_t((IUnknown*)Connector->InputStream));
  
   // Build the SOAP Message
   Serializer->StartEnvelope("","","");
   Serializer->StartBody("");
   Serializer->StartElement("SendMessage","http://guoguang.net/","","");

   Serializer->StartElement("USERNAME","","","");
   Serializer->WriteString(strUserName.GetBuffer(0));
   Serializer->EndElement();

   Serializer->StartElement("PASSWORD","","","");
   Serializer->WriteString(strPassword.GetBuffer(0));
   Serializer->EndElement();

   Serializer->StartElement("SRC_ID","","","");
   Serializer->WriteString(strSRC_ID.GetBuffer(0));
   Serializer->EndElement();

   Serializer->StartElement("DEST_TERMINAL_ID","","","");
   Serializer->WriteString(strDest.GetBuffer(0));
   Serializer->EndElement();

   Serializer->StartElement("FEE_TERMINAL_ID","","","");
   Serializer->WriteString(strFee.GetBuffer(0));
   Serializer->EndElement();

   Serializer->StartElement("LINKID","","","");
   Serializer->WriteString(strLinkid.GetBuffer(0));
   Serializer->EndElement();

   Serializer->StartElement("SERVICEID","","","");
   Serializer->WriteString(strServiceId.GetBuffer(0));
   Serializer->EndElement();

   Serializer->StartElement("AREA","","","");
   Serializer->WriteString("123");
   Serializer->EndElement();

   Serializer->StartElement("MO_ID","","","");
   Serializer->WriteString("123");
   Serializer->EndElement();

   Serializer->StartElement("CONTENT","","","");
   Serializer->WriteString(strContent.GetBuffer(0));
   Serializer->EndElement();

   Serializer->StartElement("TIMES","","","");
   Serializer->WriteString("123");
   Serializer->EndElement();
  
   Serializer->EndElement();
   Serializer->EndBody();
   Serializer->EndEnvelope();
  
   Connector->EndMessage();    


   Reader.CreateInstance(__uuidof(SoapReader30));
  
   Reader->Load(_variant_t((IUnknown*)Connector->OutputStream), "");
  
   strResult.Format("%s",(const char*)Reader->RpcResult->text);
}
catch(_com_error e)
{
   _bstr_t bstrDescription(e.Description());
   strResult.Format("失败:%s",(LPCSTR)bstrDescription);
}

return strResult;

========================================================================
原来的代码，在写入函数名的时候引入了名字空间http://guoguang.net。而在添加每个参数的时候没有写该名字空间。
修改后的代码则是在每个参数后都引入名字空间。这样问题解决了。（研究了两天，原来是这个问题。）
修改后的代码如下：
ISoapSerializerPtr Serializer;
ISoapReaderPtr Reader;
ISoapConnectorPtr Connector;
CString strResult;

CString strUserName("xfqd");
CString strPassword("xfqd321");
CString strSRC_ID("16808");
CString strDest("xxxxxx");
CString strFee("xxxxxx");
CString strLinkid("adfasdfasdf");
CString strServiceId("bz");
int nArea=371;
int MO_ID = 10;
CString strContent("adb");
int nTimes=0;
// Connect to the service
try
{
   Connector.CreateInstance(__uuidof(HttpConnector30));  
  
   Connector->Property["EndPointURL"] = "http://192.168.1.55:1478/GGAPI/service.asmx";  
   Connector->Connect();
  
  
   // Begin message
   Connector->Property["SoapAction"] = "http://guoguang.net/SendMessage";
   Connector->BeginMessage();
  
   // Create the SoapSerializer
   Serializer.CreateInstance(__uuidof(SoapSerializer30));
  
   // Connect the serializer to the input stream of the connector
   Serializer->Init(_variant_t((IUnknown*)Connector->InputStream));
  
   // Build the SOAP Message
   Serializer->StartEnvelope("","","");
   Serializer->StartBody("");
   Serializer->StartElement("SendMessage","http://guoguang.net/","","");

   Serializer->StartElement("USERNAME","http://guoguang.net/","","");
   Serializer->WriteString(strUserName.GetBuffer(0));
   Serializer->EndElement();

   Serializer->StartElement("PASSWORD","http://guoguang.net/","","");
   Serializer->WriteString(strPassword.GetBuffer(0));
   Serializer->EndElement();

   Serializer->StartElement("SRC_ID","http://guoguang.net/","","");
   Serializer->WriteString(strSRC_ID.GetBuffer(0));
   Serializer->EndElement();

   Serializer->StartElement("DEST_TERMINAL_ID","http://guoguang.net/","","");
   Serializer->WriteString(strDest.GetBuffer(0));
   Serializer->EndElement();

   Serializer->StartElement("FEE_TERMINAL_ID","http://guoguang.net/","","");
   Serializer->WriteString(strFee.GetBuffer(0));
   Serializer->EndElement();

   Serializer->StartElement("LINKID","http://guoguang.net/","","");
   Serializer->WriteString(strLinkid.GetBuffer(0));
   Serializer->EndElement();

   Serializer->StartElement("SERVICEID","http://guoguang.net/","","");
   Serializer->WriteString(strServiceId.GetBuffer(0));
   Serializer->EndElement();

   Serializer->StartElement("AREA","http://guoguang.net/","","");
   Serializer->WriteString("123");
   Serializer->EndElement();

   Serializer->StartElement("MO_ID","http://guoguang.net/","","");
   Serializer->WriteString("123");
   Serializer->EndElement();

   Serializer->StartElement("CONTENT","http://guoguang.net/","","");
   Serializer->WriteString(strContent.GetBuffer(0));
   Serializer->EndElement();

   Serializer->StartElement("TIMES","http://guoguang.net/","","");
   Serializer->WriteString("123");
   Serializer->EndElement();
  
   Serializer->EndElement();
   Serializer->EndBody();
   Serializer->EndEnvelope();
   // Send the message to the web service
  
   Connector->EndMessage();    


  
   Reader.CreateInstance(__uuidof(SoapReader30));
  
   // Connect the reader to the output stream of the connector
   Reader->Load(_variant_t((IUnknown*)Connector->OutputStream), "");
  
   // Display the result
   strResult.Format("%s",(const char*)Reader->RpcResult->text);
}
catch(_com_error e)
{
   _bstr_t bstrDescription(e.Description());
   strResult.Format("失败:%s",(LPCSTR)bstrDescription);
}

return strResult;