utf8 和 gb2312 的轉換

int chr2wch(const char* buffer, wchar_t*
&wBuf)
{
      size_t len = strlen(buffer);

      size_t wlen = MultiByteToWideChar(CP_ACP, 0,
(const char*)buffer,
int(len),
NULL, 0);

      wBuf = new wchar_t[wlen
+ 1];

      MultiByteToWideChar(CP_ACP, 0,
(const char*)buffer,
int(len), wBuf,
int(wlen));
     wBuf[wlen]
= 0;

     return (int)wlen;
}

int chr2utf(const char* buf, char*
&mb_buf)
{
    WCHAR* wbuf;
    int wlen = chr2wch(buf, wbuf);
    int mb_buf_size 
= ::WideCharToMultiByte(CP_UTF8, 0, wbuf, wlen,
NULL, 0,
NULL, 
NULL);
    mb_buf = new char[mb_buf_size
+ 1];
    int mb_len =
::WideCharToMultiByte(CP_UTF8, 0, wbuf, wlen,
mb_buf, mb_buf_size,
NULL, 
NULL);
    mb_buf[mb_len]
= 0;
    delete[] wbuf;
    return mb_len;
}


int utf2wch(const char* buffer, wchar_t*
&wBuf)
{
    size_t len = strlen(buffer);

    size_t wlen = MultiByteToWideChar(CP_UTF8, 0,
(const char*)buffer,
int(len),
NULL, 0);

    wBuf = new wchar_t[wlen
+ 1];

    MultiByteToWideChar(CP_UTF8, 0,
(const char*)buffer,
int(len), wBuf,
int(wlen));
    wBuf[wlen]
= 0;

    return (int)wlen;
}

int utf2chr(const char* buf, char*
&mb_buf)
{
    WCHAR* wbuf;
    int wlen = utf2wch(buf, wbuf);
    int mb_buf_size 
= ::WideCharToMultiByte(CP_ACP, 0, wbuf, wlen,
NULL, 0,
NULL, 
NULL);
    mb_buf = new char[mb_buf_size
+ 1];
    int mb_len =
::WideCharToMultiByte(CP_ACP, 0, wbuf, wlen,
mb_buf, mb_buf_size,
NULL, 
NULL);
    mb_buf[mb_len]
= 0;
    delete[] wbuf;
    return mb_len;
}

 

由於保存新的字符串的內存是堆上創建的，所以用完之後要 delete []out_msg;