4.QT中进程操作，线程操作



1. QT中的线程操作

T19Process.pro

SOURCES += \     main.cpp   CONFIG += C++11

main.cpp

#include <QCoreApplication> #include <QProcess> #include <QDebug> int main(int argc, char** argv) {     QCoreApplication app(argc, argv);       QProcess process;     // process.start("/home/xuegl/T0718/build-T18Database-Desktop-Debug/T18Database");     process.start("ssh [email protected]");     // process.start("ssh", QStringList() << "[email protected]" << "aa" << "bbb");     // process.write("1\n", 2);     process.waitForFinished();       // process.waitForFinished();     qDebug() << process.readAll();     // qDebug() << process.exitCode();       return app.exec(); }

1. 多线程（可以通过moveToThread(QThread *)的方法指定给指定的线程）

新建项目T20Thread,项目代码如下：

T20Thread.pro

HEADERS += \     Worker.h \     MyThread.h   SOURCES += \     Worker.cpp \     MyThread.cpp \     main.cpp

Worker.h

#ifndef WORKER_H #define WORKER_H   #include <QObject> #include <QThread>  //要开启线程的时候需要使用头文件<QThread> #include <QDebug> class Worker : public QObject {     Q_OBJECT public:     explicit Worker(QObject *parent = 0);       QThread _thread;       bool event(QEvent *ev)     {         //通过QThread::currentThread()可以获得当前线程信息         qDebug() << "event:" << QThread::currentThread();         return QObject::event(ev);     } signals:   public slots:     void doWork()     {         qDebug() << QThread::currentThread();     } };   #endif // WORKER_H

Worker.cpp

#include "Worker.h"   Worker::Worker(QObject *parent) :     QObject(parent) {     //this->moveToThread(&_thread);     _thread.start();     connect(&_thread, SIGNAL(finished()), this, SLOT(deleteLater())); }

MyThread.h

#ifndef MYTHREAD_H #define MYTHREAD_H   #include <QThread> #include <QDebug> class MyThread : public QThread {     Q_OBJECT public:     explicit MyThread(QObject *parent = 0);       void foo()     {         qDebug() << QThread::currentThread();     }       void run()     {         foo();         qDebug() << "thread is run";     }   signals:   public slots:   };   #endif // MYTHREAD_H

MyThread.cpp

#include "mythread.h"   MyThread::MyThread(QObject *parent) :     QThread(parent) { }

main.cpp

#include <QCoreApplication> #include "mythread.h" #include "worker.h" #include <QTimer> int main(int argc, char* argv[]) {     QCoreApplication app(argc, argv); #if 0     MyThread thread;     thread.start();       thread.foo(); #endif       qDebug() << "main thread is"<<QThread::currentThread();     Worker* worker = new Worker();     QTimer* timer = new QTimer;     //worker->moveToThread(&thread);       QObject::connect(timer, SIGNAL(timeout()), worker, SLOT(doWork()));     timer->setInterval(1000);     timer->start();       return app.exec(); }

运行结果：