如何让我的“std:::string url_encode_wstring(const std:::wstring &input)”在Linux上工作?

So we have such function:

我们有这样的函数:

std::string url_encode_wstring(const std::wstring &input)
     {
         std::string output;
         int cbNeeded = WideCharToMultiByte(CP_UTF8, 0, input.c_str(), -1, NULL, 0, NULL, NULL);
         if (cbNeeded > 0) {
             char *utf8 = new char[cbNeeded];
             if (WideCharToMultiByte(CP_UTF8, 0, input.c_str(), -1, utf8, cbNeeded, NULL, NULL) != 0) {
                 for (char *p = utf8; *p; *p++) {
                     char onehex[5];
                     _snprintf(onehex, sizeof(onehex), "%%%02.2X", (unsigned char)*p);
                     output.append(onehex);
                 }
             }
             delete[] utf8;
         }
         return output;
     }
std::st