C++ 使用curl post 带中文 json数据给服务器

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int PostData(CString postdata, CStringA url,string & sErro)
{
TRACE(postdata);
TRACE(_T("n**************************************n"));
if(!url)
{
    sErro+=_T("服务器地址为空");
         return -1;
    }
     CURL* curl = NULL;
    CURLcode res;
    struct curl_slist* headers = NULL;
    headers = curl_slist_append(headers, "Accept: application/json");
    headers = curl_slist_append(headers, "Content-Type:application/json;charset=UTF-8");
    curl_global_init(CURL_GLOBAL_ALL);
    curl = curl_easy_init();
    if(curl)
{
curl_easy_setopt(curl, CURLOPT_URL,url);
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
curl_easy_setopt(curl, CURLOPT_TIMEOUT, 5); //超时时间5s
curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, 5); //超时时间5s
curl_easy_setopt(curl, CURLOPT_POST, 1L);
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, postdata);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &sErro);//设置写数据
res = curl_easy_perform(curl);
if(res!=0){
CStringA strE=curl_easy_strerror(res);
sErro+=strE;
}
curl_slist_free_all(headers);
curl_easy_cleanup(curl);
return res;
}else{
curl_slist_free_all(headers);
sErro+=_T("curl初始化失败！");
return -2;
}
}

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{"timestamp":"20180613T07:53:43.879+0000","status":400,
"error":"BadRequest","message":"JSON parse error: Invalid UTF-8 middle byte 0xf4n 

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at [Source: (PushbackInputStream); line: 1,column:102];
nested exception is com.fasterxml.jackson.databind.JsonMappingException:
Invalid UTF-8 middle byte 0xf4n at [Source: (PushbackInputStream); line: 1, column:

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 102]n at [Source: (PushbackInputStream);
line: 1,
column: 84]
(through reference chain: com.yintong.huihong.api.maintenance.
model.MaintenanceDTO["operResult"])","path":"/maintenance/upload/"} 

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std::string string_To_UTF8(const std::string & str)
{
int nwLen = ::MultiByteToWideChar(CP_ACP, 0, str.c_str(), -1, NULL, 0);
wchar_t * pwBuf = new wchar_t[nwLen + 1];//一定要加1，不然会出现尾巴
ZeroMemory(pwBuf, nwLen * 2 + 2);
::MultiByteToWideChar(CP_ACP, 0, str.c_str(), str.length(), pwBuf, nwLen);
int nLen = ::WideCharToMultiByte(CP_UTF8, 0, pwBuf, -1, NULL, NULL, NULL, NULL);
char * pBuf = new char[nLen + 1];
ZeroMemory(pBuf, nLen + 1);
::WideCharToMultiByte(CP_UTF8, 0, pwBuf, nwLen, pBuf, nLen, NULL, NULL);
std::string retStr(pBuf);
delete []pwBuf;
delete []pBuf;
pwBuf = NULL;
pBuf
= NULL;
return retStr;
} 

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	string mJsonData =string_To_UTF8((string)postdata);
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, mJsonData.c_str());