MFC CString gbk 转 utf8 问题

我的工程是多字节字符
从网上下了一个函数

```void ConvertGBKToUtf8(CString &strGBK)
{
int len = MultiByteToWideChar(CP_ACP, 0, (LPCTSTR)strGBK, -1, NULL, 0);
wchar_t * wszUtf8 = new wchar_t[len];
memset(wszUtf8, 0, len);
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;

}

有些汉子可以转换  有些不能转换   求个更好的例子学习下

 void ConvertGBKToUtf8(CString &strGBK)
{
    int len=MultiByteToWideChar(CP_ACP, 0, (LPCTSTR)strGBK, -1, NULL,0);
    wchar_t * wszUtf8 = new wchar_t [len];
    memset(wszUtf8, 0, len);
    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;
}

http://www.cnblogs.com/emyueguang/p/4155144.html