utf-8轉成GBK 中文亂碼

//處理unicode 中文亂碼的問題
void ConvertUtf8ToGBK(std::string&amp, std::string strUtf8)
{
int len = MultiByteToWideChar(CP_UTF8, 0, (LPCSTR)strUtf8.c_str(), -1, NULL, 0);
unsigned short * wszGBK = new unsigned short[len + 1];
memset(wszGBK, 0, len * 2 + 2);
MultiByteToWideChar(CP_UTF8, 0, (LPCSTR)strUtf8.c_str(), -1, (LPWSTR)wszGBK, len);
len = WideCharToMultiByte(CP_ACP, 0, (LPCWSTR)wszGBK, -1, NULL, 0, NULL, NULL);
char *szGBK = new char[len + 1];
memset(szGBK, 0, len + 1);
WideCharToMultiByte(CP_ACP, 0, (LPCWSTR)wszGBK, -1, szGBK, len, NULL, NULL);
//strUtf8 = szGBK; 
amp = szGBK;
if (szGBK != NULL)
{
delete[] szGBK;
}
if (wszGBK != NULL)
{
delete[] wszGBK;
}
}