Qt QProcess执行Linux 命令行的方法

1、QProcess 打开一个bash终端，可以执行一般的命令，主要实现步骤如下

m_proces_bash = new QProcess;
m_proces_bash->start("bash");
m_proces_bash->waitForStarted();
connect(m_proces_bash,SIGNAL(readyReadStandardOutput()),this,SLOT(readBashStandardOutputInfo()));
connect(m_proces_bash,SIGNAL(readyReadStandardError()),this,SLOT(readBashStandardErrorInfo()));

2、向终端发送命令

void MainWindow::on_pushButton_bashrun_clicked()
{
    QString strCmd = ui->lineEdit_bashcmd->text();
    ui->textEdit_bashmsg->append("Linux:~$ "+strCmd);
    m_proces_bash->write(ui->lineEdit_bashcmd->text().toLocal8Bit() + '\n');
    ui->lineEdit_bashcmd->clear();
}

3、接收终端返回

void MainWindow::readBashStandardOutputInfo()
{
    QByteArray cmdout = m_proces_bash->readAllStandardOutput();
    if(!cmdout.isEmpty()){
        ui->textEdit_bashmsg->append(QString::fromLocal8Bit(cmdout));
    }
    QScrollBar* scroll = ui->textEdit_bashmsg->verticalScrollBar();
    scroll->setSliderPosition(scroll->maximum());
}
void MainWindow::readBashStandardErrorInfo()
{
    QByteArray cmdout = m_proces_bash->readAllStandardError();
    if(!cmdout.isEmpty()){
        ui->textEdit_bashmsg->append(QString::fromLocal8Bit(cmdout));
    }
    QScrollBar* scroll = ui->textEdit_bashmsg->verticalScrollBar();
    scroll->setSliderPosition(scroll->maximum());
}

4、当命令需要超级权限时，sudo xx 需要修改为sudo -S xx

例如：（1）ls 执行正常

（2）sudo ls 执行失败

（3）执行sudo -S ls 执行成功