#include <iostream> #include <string> #include <tchar.h> #include <Windows.h> using namespace std; //Converting a WChar string to a Ansi string char *w2c(char *pcstr,const wchar_t *pwstr, size_t len) {  int nlength=wcslen(pwstr);  //获取转换后的长度  int nbytes = WideCharToMultiByte( 0, 0, pwstr, nlength, NULL,0,NULL, NULL );  if(nbytes>len)   nbytes=len;  // 通过以上得到的结果，转换unicode 字符为ascii 字符  WideCharToMultiByte( 0,0, pwstr, nlength,   pcstr, nbytes, NULL,   NULL );  return pcstr ; } int main(){  setlocale(LC_ALL,"chs");  char* cc = "this is a char 测试";  wchar_t* wcc = L"this is a wchar 测试";  string str("this is a string 测试 ");  wstring wstr = L"this is a wstring 测试";  //string to char  const char* char_test = str.c_str();  //cout<<"char_test:"<<char_test<<endl;  //char to string  string ss = cc;  //cout<<"ss is :"<<ss<<endl;  //wstring to wchar  const wchar_t* wchar_test = wstr.c_str();  //wcout<<wchar_test<<endl;  //wchar to wstring  wstring wss = wcc;  wcout<<wcc<<endl;  //char to wchar_t  wchar_t *wc = new wchar_t[str.size()+1];  //swprintf(wc,L"%S",cc);  //wcout<<cc<<endl;  delete []wc;  // wchar_t to char  char *pcstr = (char *)malloc(sizeof(char)*(2 * wcslen(wcc)+1));  memset(pcstr , 0 , 2 * wcslen(wcc)+1 );  w2c(pcstr,wcc,2 * wcslen(wcc)+1) ;  free(pcstr);  system("pause");  return 1; }