C++ 调用WebService（C#）乱码问题

[「已注销」]

直接如主题吧：
WebService服务端：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.IO;

namespace WebService
{
    /// <summary>
    /// Summary description for Service1
    /// </summary>
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [System.ComponentModel.ToolboxItem(false)]
    // To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. 
    // [System.Web.Script.Services.ScriptService]
    public class Service1 : System.Web.Services.WebService
    {

        [WebMethod]
        public string HelloWorld()
        {
            return "Hello World";
        }

        [WebMethod]
        public string Hello(string input)
        {
            return "Hello " + input;
        }
    }
}

客户端（VC6.0）：

#include <stdio.h>
#include "windows.h"
#include "Atlbase.h"
#import "msxml4.dll"
using namespace MSXML2;
#include <string>

using namespace std;

char* WSDLURLTEST = "http://localhost/WebService/Service1.asmx?WSDL";

void SayHello(string strContent,string& strResp);

int main()
{	
	SayHello("你好！",strRsp);
	getchar();
	return 0;
}

void SayHello(string strContent,string& strResp)
{
	//CString cstrCon = strContent.c_str();
	//CString str;
	//zhToUtf8(cstrCon, str);
	//strContent = str.GetBuffer(str.GetLength());
	CoInitialize(NULL);
	try
	{
		IXMLHTTPRequestPtr xmlRequest;//定义http请求对象
        xmlRequest.CreateInstance(__uuidof(XMLHTTP));//创建实列
        CComVariant vFalse(FALSE);
        CComVariant vNull(NULL);
        xmlRequest->open("POST",_bstr_t(WSDLURLTEST),vFalse,vNull,vNull);//打开WEBServeice方法:加?wsdl
        xmlRequest->setRequestHeader(_bstr_t(_T("Content-Type")), _bstr_t(_T("text/xml")));

		string sb;
		sb.append("<?xml version='1.0' encoding='utf-8'?>");
		sb.append("<soap:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\">");

		sb.append("<soap:Body>");
		sb.append("<Hello xmlns=\"http://tempuri.org/\">");
		sb.append("<input>");sb.append(strContent);sb.append("</input>");
		sb.append("</Hello>");
		sb.append("</soap:Body>");
		sb.append("</soap:Envelope>");

		xmlRequest->send(_variant_t(sb.c_str()));//发送数据

		BSTR bstrbody;
        xmlRequest->get_responseText(&bstrbody);//得到返回数据
        _bstr_t bstrtbody(bstrbody);

        printf("%s\n",(LPCTSTR)bstrtbody);

        MSXML2::IXMLDOMDocument2Ptr m_xmldoc;
        m_xmldoc.CreateInstance(__uuidof(MSXML2::DOMDocument));
        m_xmldoc->loadXML(bstrbody);

        MSXML2::IXMLDOMNodePtr node = m_xmldoc->documentElement->firstChild;
        strResp=(string)m_xmldoc->documentElement->text;
	}
	catch(_com_error &e)
	{
		printf("SayHello Error: %s",(char*)e.Description());		
	}
}

打印结果：

<?xml version="1.0" encoding="utf-8"?><soap:Envelope xmlns:soap="http://schemas.
xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance
" xmlns:xsd="http://www.w3.org/2001/XMLSchema"><soap:Body><HelloResponse xmlns="
http://tempuri.org/"><HelloResult>Hello ?????????</HelloResult></HelloResponse><
/soap:Body></soap:Envelope>

返回结果中的中文都是乱码。
请问各位这个问题怎么解决？

[xian_wwq]

乱码是因为编码格式不对， 好像c#的WebService默认用的是Unicode

[「已注销」]

引用 1 楼 xian_wwq 的回复:

乱码是因为编码格式不对， 好像c#的WebService默认用的是Unicode

经过如下：

char* MBCS2Utf8(char* szMBCS, ULONG* _out_length)
{
    if (szMBCS == NULL || _out_length == NULL)
        return NULL;
    // 方法：先转换成CP_ACP再转换成CP_UTF8
    int nLength = MultiByteToWideChar(CP_ACP, 0, szMBCS, -1, NULL, NULL);   // 获取缓冲区长度，再分配内存
    WCHAR *tch = new WCHAR[nLength];
     
    nLength = MultiByteToWideChar(CP_ACP, 0, szMBCS, -1, tch, nLength);     // 将MBCS转换成Unicode
 
    int nUTF8len = WideCharToMultiByte(CP_UTF8, 0, tch, -1, 0, 0, 0, 0);   // 获取UTF-8编码长度
    char *utf8_string = new char[nUTF8len];
    WideCharToMultiByte(CP_UTF8, 0, tch, -1, utf8_string, nUTF8len, 0, 0); //转换成UTF-8编码
    *_out_length = nUTF8len;
 
    delete tch;
    return utf8_string;
}

编码转换，依旧不行

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gsoap soap_set_mode(&proxy,SOAP_C_UTFSTRING); + 编码转换