GBK与UTF8字符转换函数

void ConvertGBKToUtf8(CString& strGBK)
{
         int len=MultiByteToWideChar(CP_ACP, 0, (LPCTSTR)strGBK, -1, NULL,0);
         unsigned short wszUtf8 = new unsigned short[len+1];
         memset(wszUtf8, 0, len 2 + 2);
         MultiByteToWideChar(CP_ACP, 0, (LPCTSTR)strGBK, -1, wszUtf8, len);        
 
         len = WideCharToMultiByte(CP_UTF8, 0, wszUtf8, -1, NULL, 0, NULL, NULL);
         char szUtf8=new char[len + 1];
         memset(szUtf8, 0, len + 1);        
         WideCharToMultiByte (CP_UTF8, 0, wszUtf8, -1, szUtf8, len, NULL,NULL);
 
         strGBK = szUtf8;
         delete[] szUtf8;                
         delete[] wszUtf8;                
}

void ConvertUtf8ToGBK(CString& strUtf8)
{
         int len=MultiByteToWideChar(CP_UTF8, 0, (LPCTSTR)strUtf8, -1, NULL,0);
         unsigned short wszGBK = new unsigned short[len+1];        
         memset(wszGBK, 0, len 2 + 2);
         MultiByteToWideChar(CP_UTF8, 0, (LPCTSTR)strUtf8, -1, wszGBK, len);
 
         len = WideCharToMultiByte(CP_ACP, 0, wszGBK, -1, NULL, 0, NULL, NULL);
         char szGBK=new char[len + 1];
         memset(szGBK, 0, len + 1);
         WideCharToMultiByte (CP_ACP, 0, wszGBK, -1, szGBK, len, NULL,NULL);
 
         strUtf8 = szGBK;
         delete[] szGBK;
         delete[] wszGBK;
}