Qt代码：QProcess的应用——控制台打印程序

#include "mainwindow.h"

#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :

 QMainWindow(parent),

 ui(new Ui::MainWindow)

{

 ui->setupUi(this);

 //创建输出文本框，设置为只读属性，并且是中间部件

 m_LogW = new QTextEdit();

 m_LogW->setReadOnly(true);

 setCentralWidget(m_LogW);

 //创建目录输入框，为底部栏部件

 m_InputArea = new QLineEdit();

 QDockWidget *qdw = new QDockWidget("Type commands here:");

 qdw->setWidget(m_InputArea);

 addDockWidget(Qt::BottomDockWidgetArea, qdw);

 connect(m_InputArea, SIGNAL(returnPressed()),

 this, SLOT(execute()));

 //创建Shell进程，读取标准输出和标准错误

 m_Shell = new QProcess(this);

 m_Shell->setReadChannelMode(QProcess::MergedChannels);

 connect(m_Shell, SIGNAL(readyReadStandardOutput()),

 this, SLOT(showOutput()));

 //启动Shell

 m_Shell->start("cmd", QStringList(), QIODevice::ReadWrite);

}

MainWindow::~MainWindow()

{

 delete ui;

}

//向Shell传输命令

void MainWindow::execute()

{

 //输入命令

 QString cmdStr = m_InputArea->text() + "\n";

 //清除命令输入框

 m_InputArea->setText("");

 //传输命令到shell

 QByteArray bytes = cmdStr.toUtf8();

 m_Shell->write(bytes);

}

void MainWindow::showOutput()

{

 //读取标准输出的数据

 QByteArray bytes = m_Shell->readAllStandardOutput();

 //以"\n"为标志分割数据

 QStringList lines = QString(bytes).split("\n");

 //遍历数据，显示到输出文本框上

 foreach (QString line, lines)

 {

 m_LogW->append(line);

 }

}