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：