Windows 下关于转码的函数

 1 std::string& MsgFieldList::GBToUTF8(std::string& des,const char* str)
 2 {
 3      WCHAR *strSrc;
 4      TCHAR *szRes;
 5 
 6      //获得临时变量的大小
 7      int i = MultiByteToWideChar(CP_ACP, 0, str, -1, NULL, 0);
 8      strSrc = new WCHAR[i+1];
 9      MultiByteToWideChar(CP_ACP, 0, str, -1, strSrc, i);
10 
11      //获得临时变量的大小
12      i = WideCharToMultiByte(CP_UTF8, 0, strSrc, -1, NULL, 0, NULL, NULL);
13      szRes = new TCHAR[i+1];
14      int j=WideCharToMultiByte(CP_UTF8, 0, strSrc, -1, szRes, i, NULL, NULL);
15 
16      des = szRes;
17      delete []strSrc;
18      delete []szRes;
19 
20      return des;
21 }

 1 std::string& MsgFieldList::UTF8ToGB(std::string& des,const char* str)
 2 {
 3      WCHAR *strSrc;
 4      TCHAR *szRes;
 5 
 6      //获得临时变量的大小
 7      int i = MultiByteToWideChar(CP_UTF8, 0, str, -1, NULL, 0);
 8      strSrc = new WCHAR[i+1];
 9      MultiByteToWideChar(CP_UTF8, 0, str, -1, strSrc, i);
10 
11      //获得临时变量的大小
12      i = WideCharToMultiByte(CP_ACP, 0, strSrc, -1, NULL, 0, NULL, NULL);
13      szRes = new TCHAR[i+1];
14      WideCharToMultiByte(CP_ACP, 0, strSrc, -1, szRes, i, NULL, NULL);
15 
16      des = szRes;
17      delete []strSrc;
18      delete []szRes;
19 
20      return des;
21 }