GB2312和 UTF8的互相转换函数

//将UTF8转化为GB2312
string  UTF8ToGB2132(string  strSrc)
{
    string result;
    WCHAR *wstrSrc = NULL;
    char *szRes = NULL;
    int i;

    // UTF8转换成Unicode
    i = MultiByteToWideChar(CP_UTF8, 0, strSrc.c_str(), -1, NULL, 0);
    wstrSrc = new WCHAR[i+1];
    MultiByteToWideChar(CP_UTF8, 0, strSrc.c_str(), -1, wstrSrc, i);

    // Unicode转换成GB2312
    i = WideCharToMultiByte(CP_ACP, 0, wstrSrc, -1, NULL, 0, NULL, NULL);
    szRes = new char[i+1];
    WideCharToMultiByte(CP_ACP, 0, wstrSrc, -1, szRes, i, NULL, NULL);

    result = string (szRes);
    if (wstrSrc != NULL)
    {
        delete []wstrSrc;
        wstrSrc = NULL;
    }
    if (szRes != NULL)
    {
        delete []szRes;
        szRes = NULL;
    }

    return result;
}  出处：http://blog.csdn.net/tangaowen/article/details/6158984