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 root@42.121.13.248");     // process.start("ssh", QStringList() << "root@42.121.13.248" << "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 ); 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 ); 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：