QProcess¶

QtCreator入门之QProcess篇.

QtCreator入门之QProcess篇¶

用Qt和C++实现一个命令行控制台¶

QProcess example¶

open calc.exe example 1

C++
    QProcess process;
    process.start( "C:/Windows/System32/calc.exe" );

open calc.exe example 2

C++
    QProcess process;
    process.start( "calc.exe" );

open mspaint.exe

C++
    QProcess process;
    process.start( "C:/Program Files/WindowsApps/Microsoft.Paint_11.2404.1020.0_x64__8wekyb3d8bbwe/PaintApp/mspaint.exe" );

open mspaint.exe

C++
    QProcess process;
    process.start( "mspaint.exe" );

CMD line example¶

C++
void Terminal::OnReturnKeyPressed()
{
    QStringList argument;
    //QString cmd = "dir";
    QString cmd = "cd d:\\ && dir";
    argument << "/c" << cmd;
    //this->procCmd->start("cmd", QStringList() << "/c" << "dir" );
    this->procCmd->start("cmd", argument );
    if ( !this->procCmd->waitForStarted() ) {
        qDebug() << "Terminal::OnReturnKeyPressed waitForStarted Failed";
        return;
    }

    if ( !this->procCmd->waitForFinished() ) {
        qDebug() << "Terminal::OnReturnKeyPressed External waitForFinished Failed";
        return;
    }

    this->ui->textEdit->append( cmd );

    //Information Output
    qDebug() << "Success:OnReturnKeyPressed";
}

C++
this->procCmd = new QProcess( this );
//Command line related
QObject::connect( this->procCmd, &QProcess::readyRead, this, &Terminal::ReadOutput );                //Read command line data
QObject::connect( this->procCmd, &QProcess::readyReadStandardOutput, this, &Terminal::ReadStandardOutput );  //Read command line standard data
QObject::connect( this->procCmd, &QProcess::finished, this,  &Terminal::FinishedProcess );           //Command line processing ends
QObject::connect( this->procCmd, &QProcess::errorOccurred, this, &Terminal::ErrorProcess );          //Command line error handling
QObject::connect( this->procCmd, &QProcess::stateChanged, this, &Terminal::OnStateChanged );          //Command line error handling

//this->procCmd->start("cmd", QStringList() << "/c" << "ping www.baidu.com" );

QDir::setCurrent

C++
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    // 获取当前目录路径
    QString currentPath = QDir::currentPath();
    qDebug() << "Current Path: " << currentPath;

    // 设置新的当前目录路径
    QDir::setCurrent("/path/to/new/directory");

    // 获取新的当前目录路径
    QString newPath = QDir::currentPath();
    qDebug() << "New Path: " << newPath;

    return a.exec();
}

C++
#include <QCoreApplication>
#include <QDir>
#include <QDebug>
#include <iostream>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    QString currentPath = QDir::currentPath();
    qDebug() << "Current Path: " << currentPath;

    while (true) {
        std::cout << "Enter command (cd <directory> or 'exit' to quit): ";
        std::string input;
        std::getline(std::cin, input);

        if (input == "exit") {
            break;
        } else if (input.substr(0, 3) == "cd ") {
            QString targetDir = QString::fromStdString(input.substr(3));
            if (QDir::setCurrent(targetDir)) {
                qDebug() << "Changed directory to: " << QDir::currentPath();
            } else {
                qDebug() << "Failed to change directory. Please check the path.";
            }
        } else {
            qDebug() << "Invalid command. Please use 'cd <directory>' or 'exit'.";
        }
    }

    return a.exec();
}

自动补全功能

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{

C++

 1 class="code">#include <QCoreApplication> #include <QDir> #include <QLineEdit> #include <QCompleter> #include <QDebug> int main(int argc, char *argv[])  QCoreApplication a(argc, argv); QString currentPath = QDir::currentPath(); qDebug() << "Current Path: " << currentPath; // 创建一个LineEdit控件用于接收用户输入 QLineEdit lineEdit; lineEdit.setPlaceholderText("Enter command (cd <directory>)"); // 获取当前目录下的所有子目录 QDir dir(currentPath); QStringList directories = dir.entryList(QDir::Dirs | QDir::NoDotAndDotDot); // 创建一个Completer对象，用于提供自动补全功能 QCompleter completer(directories); completer.setCaseSensitivity(Qt::CaseInsensitive); lineEdit.setCompleter(&completer); // 连接textChanged信号，检测用户输入 QObject::connect(&lineEdit, &QLineEdit::textChanged, [&]() { QString input = lineEdit.text(); if (input.startsWith("cd ")) { QString targetDir = input.mid(3); if (directories.contains(targetDir)) { qDebug() << "Directory found: " << targetDir; } } }); lineEdit.show(); return a.exec(); } div>
installEventFilter
C++
1
2     ui->textEdit->installEventFilter(this);
    ui->textEdit->viewport()->installEventFilter(this);

QDir
C++
1 QDir directory("Pictures/MyPictures");

C++
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52 #include <QApplication>
#include <QProcess>
#include <QThread>

class Worker : public QObject
{
    Q_OBJECT
public:
    Worker()
    {
        qDebug() << "Worker::Worker";
        QObject::connect(&process, &QProcess::finished, this, &Worker::onProcessFinished);
    }

    void startProcess( const QString & program )
    {
        qDebug() << "Worker::startProcess";
        process.start( program );
    }
private slots:
    void onProcessFinished( int exitCode, QProcess::ExitStatus exitStatus )
    {
        qDebug() << "Process finished with exit code" << exitCode << "and status" << exitStatus;
    }
private:
    QProcess process;
};

class Thread : public QThread
{
    Q_OBJECT
protected:
    void run() override
    {
        qDebug() << "Thread run";
        Worker worker;
        worker.startProcess( "calc" );
        exec();
    }
};

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    Thread * thread = new Thread();
    QObject::connect(thread, &QThread::finished, thread, &QThread::deleteLater);
    thread->start();

    return app.exec();
}
#include "main.moc"