QT中调用外部程序：QProcess的使用

本文通过QProcess，实现了在Qt中调用外部程序（控制台程序），并将输出重定向到了一个QTextEdit里。效果如下图所示：

运行界面如下：

程序共包含以下三个文件：

//: main.cpp
#include "process.h"
#include <QApplication>
#include <QTextCodec>
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QTextCodec::setCodecForTr(QTextCodec::codecForLocale());
    QTextCodec::setCodecForCStrings(QTextCodec::codecForLocale());
    Process w;
    w.show();
    return a.exec();
}

 

//: process.h
#ifndef PROCESS_H
#define PROCESS_H
#include <QWidget>
class QLabel;
class QLineEdit;
class QProcess;
class QPushButton;
class QTextEdit;
class Process : public QWidget
{
    Q_OBJECT
public:
    Process(QWidget *parent = 0, Qt::WFlags flags = 0);
    ~Process();
private slots:
    void runClicked();
    void readOutput();
private:
    QProcess* cmd;
    QString output;
    QLabel* inputLabel;
    QLineEdit* inputEdit;
    QPushButton* runButton;
    QLabel* outputLabel;
    QTextEdit* outputEdit;
};
#endif // PROCESS_H

 

//: process.cpp
#include <QtGui>
#include "process.h"
Process::Process(QWidget *parent, Qt::WFlags flags)
    : QWidget(parent, flags)
{
    inputLabel = new QLabel(tr("请输入命令："));
    inputEdit = new QLineEdit;
    runButton = new QPushButton(tr("运行"));
    outputLabel = new QLabel(tr("运行结果如下："));
    outputEdit = new QTextEdit;
    outputEdit->setReadOnly(true);
    QHBoxLayout* hlayout = new QHBoxLayout;
    hlayout->addWidget(inputEdit);
    hlayout->addWidget(runButton);
    QVBoxLayout* layout = new QVBoxLayout;
    layout->addWidget(inputLabel);
    layout->addLayout(hlayout);
    layout->addWidget(outputLabel);
    layout->addWidget(outputEdit);
    setLayout(layout);

    cmd = new QProcess;
    connect(inputEdit, SIGNAL(returnPressed()), this, SLOT(runClicked()));
    connect(runButton, SIGNAL(clicked(bool)), this, SLOT(runClicked()));
    connect(cmd, SIGNAL(readyRead()), this, SLOT(readOutput()));
    resize(500, 300);
}
Process::~Process()
{
}
void Process::runClicked()
{
    QString input = inputEdit->text();
    cmd->start(input);
    output = tr("");
    outputEdit->setText(output);
}
void Process::readOutput()
{
    output += cmd->readAll();
    outputEdit->setText(output);
}