QProcess实现交互式命令

首先，QProcess不能获取二级子进程的输入和输出

比如执行不了ssh，如果是使用ssh请参考我另一篇文章，QSsh的使用

这里以调用cmd为例

.h

#ifndef DIALOG_H
#define DIALOG_H

#include <QDialog>

namespace Ui {
class Dialog;
}

class Dialog : public QDialog
{
    Q_OBJECT

public:
    explicit Dialog(QWidget *parent = 0);
    ~Dialog();

private slots:
    void on_pushButton_clicked();

    void readSlot();
    void readError();

private:
    Ui::Dialog *ui;

    QProcess process;
};

#endif // DIALOG_H

.cpp

#include "dialog.h"
#include "ui_dialog.h"
#include <QProcess>
Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog)
{
    process.setProcessChannelMode(QProcess::ForwardedChannels);
    connect(&process, SIGNAL(readyRead()), this, SLOT(readSlot()));
    connect(&process, SIGNAL(readyReadStandardError()), this, SLOT(readError()));
    process.start("cmd");
    if(!process.waitForStarted()) {
        qDebug()<< "process error" <<                          QString::fromLocal8Bit(process.readAllStandardError());
    } else {
        qDebug()<<"process read"<<QString::fromLocal8Bit(process.readAllStandardOutput());
    }
}

void Dialog::readSlot() {
    qDebug() << "can read line" << process.canReadLine();
    while(process.canReadLine()) {
        char output[1024];
        int ret = process.readLine(output,1023);
        QString tmpstr = QString::fromLocal8Bit(output);
//        emit senddata_sign(tmpstr);
        qDebug() << "tmpstr" << tmpstr;
    }
}

void Dialog::readError() {
    qDebug()<< "read error" << QString::fromLocal8Bit(process.readAllStandardError());
}
//通过点击按钮进行命令写入
void Dialog::on_pushButton_clicked()
{
    qDebug() << "line edit" << ui->lineEdit->text();
    char*ch;
    QByteArray ba = (ui->lineEdit->text() + '\r' + '\n').toLatin1();
    ch = ba.data();
    process.write(ch);
    process.waitForBytesWritten(2000);
}