UTF-8编码:[1,1,1,0,A5,A6,A7,A8],[1,0,B3,B4,B5,B6,B7,B8],[1,0,C3,C4,C5,C6,C7,C8];对应的UNICODE编码：[A5,A6,A7,A8,B3,B4,B5,B6],[B7,B8,C3,C4,C5,C6,C7,C8]CString LogInDlg::GB2312ToUTF8(char *str)
{
 CString result;
 WCHAR *strSrc = http://www.mamicode.com/NULL;
 TCHAR *szRes = NULL;
 int i;
 
 //GB2312转换成Unicode
  i = MultiByteToWideChar(CP_ACP, 0, str, -1, NULL, 0);
  strSrc = http://www.mamicode.com/new >
  MultiByteToWideChar(CP_ACP, 0, str, -1, strSrc, i);
 
 //Unicode转换成UTF8
 i = WideCharToMultiByte(CP_UTF8, 0, strSrc, -1, NULL, 0, NULL, NULL);
 szRes = new TCHAR[i+1];
 WideCharToMultiByte(CP_UTF8, 0, strSrc, -1, szRes, i, NULL, NULL);
 
 result = szRes;
 if (strSrc != NULL)
 {
  delete []strSrc;
  strSrc = http://www.mamicode.com/NULL;
 }
 if (szRes != NULL)
 {
  delete []szRes;
  szRes = NULL;
 }
 
 return result;
}CString LogInDlg::UTF8ToGB2312(char *str)
{
 CString result;
 WCHAR *strSrc = http://www.mamicode.com/NULL;
 TCHAR *szRes = NULL;
 int i;
 
 // UTF8转换成Unicode
 i = MultiByteToWideChar(CP_UTF8, 0, str, -1, NULL, 0);
 strSrc = http://www.mamicode.com/new >
 MultiByteToWideChar(CP_UTF8, 0, str, -1, strSrc, i);
 
 // Unicode转换成GB2312
 i = WideCharToMultiByte(CP_ACP, 0, strSrc, -1, NULL, 0, NULL, NULL);
 szRes = new TCHAR[i+1];
 WideCharToMultiByte(CP_ACP, 0, strSrc, -1, szRes, i, NULL, NULL);
 
 result = szRes;
 if (strSrc != NULL)
 {
  delete []strSrc;
  strSrc = http://www.mamicode.com/NULL;
 }
 if (szRes != NULL)
 {
  delete []szRes;
  szRes = NULL;
 }
 
 return result;
}

参考网址：

http://www.codeproject.com/KB/string/UTF8.aspx