轉載自：http://blog.csdn.net/k346k346/article/details/50082705
#include <windows.h>
#include <iostream>
using namespace std;

int main(){
    wchar_t* ws=L"測試字串";
    char* ss="ABC我們";
    int bufSize=WideCharToMultiByte(CP_ACP,NULL,ws,-1,NULL,0,NULL,FALSE);
    cout<<bufSize<<endl;
    char
 
 *sp=new char[bufSize];
    WideCharToMultiByte(CP_ACP,NULL,ws,-1,sp,bufSize,NULL,FALSE);
    cout<<sp<<endl;
    delete[] sp;
    bufSize=MultiByteToWideChar(CP_ACP,0,ss,-1,NULL,0);
    cout<<bufSize<<endl;
    wchar_t* wp=new wchar_t[bufSize];
    MultiByteToWideChar(CP_ACP,0,ss,-1
 
,wp,bufSize);
    wcout.imbue(locale("chs"));

}

程式輸出結果： 
11 
測試字串 
6 
ABC我們