//网上找的函数
std::string GBKToUTF8(const std::string& strGBK)
{
    std::string strOutUTF8 = "";
    WCHAR* str1;//用来放gbk
    int n = MultiByteToWideChar(CP_ACP, 0, strGBK.c_str(), -1, NULL, 0);
    str1 = new WCHAR[n];
    MultiByteToWideChar(CP_ACP, 0, strGBK.c_str(), -1, str1, n);//放宽字符的gbk，难道只有放到宽字符中才能转换吗 //好像是的
    n = WideCharToMultiByte(CP_UTF8, 0, str1, -1, NULL, 0, NULL, NULL);
    char* str2 = new char[n];//用来放utf8
    WideCharToMultiByte(CP_UTF8, 0, str1, -1, str2, n, NULL, NULL);//不知为何放在多字节的utf8中
    strOutUTF8 = str2;//char直接赋值给String
    delete[]str1;
    str1 = NULL;
    delete[]str2;
    str2 = NULL;
    return strOutUTF8;
}
//自己模仿的
std::string UTF8ToGBK(const std::string&strUTF8) {
    std::string strOutGBK = "";
    WCHAR* wstr;
    int n = MultiByteToWideChar(CP_UTF8, 0, strUTF8.c_str(), -1, NULL, 0);
    wstr = new WCHAR[n];
    MultiByteToWideChar(CP_UTF8, 0, strUTF8.c_str(), -1, wstr, n);

    n = WideCharToMultiByte(CP_ACP, 0, wstr, -1, NULL, 0, NULL, NULL);
    char* str = new char[n];
    WideCharToMultiByte(CP_ACP, 0, wstr, -1, str, n, NULL, NULL);
    strOutGBK = str;
    delete[] wstr;
    wstr = NULL;
    delete[] str;
    str = NULL;
    return strOutGBK;
}