wchar_t转为char*

具体代码：

static char* add_arg_to_array(const wchar_t* arg)
{
    int iSize = WideCharToMultiByte(CP_ACP, 0, arg, -1, NULL, 0, NULL, NULL);
    char* chdata = (char*)malloc(iSize*sizeof(char));
    WideCharToMultiByte(CP_ACP, 0, arg, -1, chdata, iSize, NULL, NULL);

    return chdata;
}