案例：

　　　quint8 ad[8] = {0,100,150,200,0,220,230,250};

    QString str;

    QString str2;

    ab = (float)(*((float *)(ad)));

    ac = (float)(*((float *)(ad+4)));

    ae = (float)(*(float *)(gt));

    qDebug() << QString("%1 ").arg(ab, 0, 'f', 6)+" "+ QString("%1 ").arg(ac, 0, 'f', 6);

    qDebug() << QString("%1 ").arg(ae, 0, 'f', 6);

    str += str2.setNum(ab, 'f', 6) + " " + str2.setNum(ac,'f',6) + "\n"; //出现相同的结果值；因为同一个setNum，不能写在同一语句中。