qt-获取system调用返回信息

QString QFun::GetResultFromSystemCall(const char *pCmd)
{
    FILE   *stream;
    char   buf[2048];
    memset( buf, '\0', sizeof(buf) );
    stream = popen( pCmd, "r" );
    fread( buf, sizeof(char), sizeof(buf), stream);
    pclose( stream );
    return QString(buf);
}