VC++ 多字节宽字符相互转换

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多字节宽字符相互转换用的较多，自己写了一点留作以后参考。

string str;

cout<<"please input chinese"<<endl;
cin>>str;
//setlocale(LC_CTYPE,".chs");
const char* cstr1 = str.c_str();
//int len = 2*sizeof(cstr);

int WLen = MultiByteToWideChar(CP_ACP,             // code page
                                   0,                // character-type options
           cstr1,              // string to map
                                   -1,                 // number of bytes in string
                                   NULL,            // wide-character buffer
                                   0                // size of buffer
);
    wchar_t * buffer = new wchar_t[WLen+1];
int RetWLen = MultiByteToWideChar(CP_ACP,             // code page
                                   0,                // character-type options
           cstr1,              // string to map
                                   -1,                 // number of bytes in string
                                   buffer,            // wide-character buffer
                                   WLen                // size of buffer
);
buffer[WLen] = '/0';
printf("/nthe translated num is %d",RetWLen);

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同理宽字符到多字节
int MLen = WideCharToMultiByte(
                                   CP_ACP,            // code page
                                   0,            // performance and mapping flags
                                   buffer,    // wide-character string
                                   -1,          // number of chars in string
                                   NULL,     // buffer for new string
                                   0,          // size of buffer
                                   NULL,     // default for unmappable chars
                                   NULL // set when default char used
); //这里第六个参数若为0 表示返回宽字符对应多字节的长度
char* MultiBte = new char[MLen+1];
int RetMLen = WideCharToMultiByte(
                                   CP_ACP,            // code page
                                   0,            // performance and mapping flags
                                   buffer,    // wide-character string
                                   -1,          // number of chars in string
                                   MultiBte,     // buffer for new string
                                   MLen,          // size of buffer
                                   NULL,     // default for unmappable chars
                                   NULL // set when default char used
); //完成转换
printf("/nthe translated MultiByte num is :%d",RetMLen);
printf("/nthe Multibyte value:");
MultiBte[MLen]='/x0';
fputs(MultiBte,stdout); //可直接在终端输出

头文件 windows.h