Qt线程(1) moveToThread

  • 若在Qt准备使用线程类一般有两种方式(1) 采用WorkObject配合QThread进行使用 (2)继承QThread, 重载run()函数即可。
  • 注:采用Qt::Concurrent之类的不在本文讨论范围内.

　　方式一、采用WorkObject配合QThread进行使用

  1. 创建一个用于计算的对象，该对象的运算相关函数防止在public slots 下：
     1 //..Object.h
 2 class CObject : public QObject
 3 {
 4     Q_OBJECT
 5 public:
 6     explicit CObject(QObject *parent = 0);
 7     ~CObject();
 8 
 9 signals:
10     void sigFinish(const QString &s); //跨线程请注意使用const
11 
12 public slots:
13     void Run();
14     void Stop();
15 
16 private:
17     bool m_bStop;
18 };
19 
20 //..Object.cpp
21 CObject::CObject(QObject *parent)
22     : QObject(parent),m_bStop(false)
23 {
24 
25 }
26 
27 void CObject::Run()
28 {
29     int i = 0;
30     while(1)
31     {
32         if(m_bStop)
33         {
34             return;
35         }
36         qDebug()<<"Object TheradID = "<<QThread::currentThreadId();
37         qDebug()<<"Run i = "<<i;
38         sleep(1);
39         if(++i == 10)
40         {
41             emit sigFinish("Finish");//信号是线程安全的,当然这得扯到后面的连接方式
42         }
43     }
44 }
45 
46 void CObject::Stop()
47 {
48     m_bStop = true;
49     emit sigFinish("Stop");//!!按照需求添加
50 }
  2. 创建一个测试对象CTest
     1 //..test.h
 2 class CTest : public QObject
 3 {
 4     Q_OBJECT
 5 public:
 6     explicit CTest(QObject *parent = 0);
 7     void Run();
 8     void Stop();
 9 
10 signals:
11 
12 private slots:
13     void slotFinish(const QString &);
14 
15 private:
16     QList<CObject *> m_ListObj;
17 };
18 
19 //..test.cpp
20 CTest::CTest(QObject *parent) : QObject(parent)
21 {
22 
23 }
24 
25 void CTest::Run()
26 {
27     QThread *pThread = new QThread(this); // 只充当一个作为另个线程的入口
28     CObject *pObj = new CObject; //注意:moveToThread不能使用在双亲对象上
29     m_ListObj.append(pObj);
30     
31     qDebug()<<"Current Main Run Thread = "<<QThread::currentThreadId();
32   
33     connect(pObj,SIGNAL(sigFinish(QString)),pObj,SLOT(deleteLater())); 
34     connect(pObj,SIGNAL(sigFinish(QString)),pThread,SLOT(quit()));
35     connect(pObj,SIGNAL(sigFinish(QString)),this,SLOT(slotFinish(QString)));
36     
37     connect(pThread,SIGNAL(started()),pObj,SLOT(Run()));
38     connect(pThread,SIGNAL(finished()),pObj,SLOT(deleteLater()));
39     
40      pObj->moveToThread(pThread);
41 
42     pThread->start();
43 }
44 void CTest::Stop()
45 {
46     foreach (CObject *pObj, m_ListObj)
47     {
48         if(!QMetaObject::invokeMethod(pObj,"Stop",Qt::DirectConnection))//!!留个坑,为什么autoConnection会没反应
49         {
50             qDebug()<<"error";
51         }
52     }
53     m_ListObj.clear();
54 }
55 
56 void CTest::slotFinish(const QString &s)
57 {
58     qDebug()<<"Main Thread Receive:"<<s;
59 }
  3. main.cpp
     1 //..main.cpp
 2 int main(int argc, char *argv[])
 3 {
 4     QCoreApplication a(argc, argv);
 5     CTest test;
 6     test.Run();
 7     sleep(5);
 8     test.Stop();
 9     return a.exec();
10 }
  4. 执行结果

　　

　　Well Done,方式2见Qt线程(2) QThread中使用WorkObject?

posted @ 2016-03-06 11:31  GoMountains  阅读(627)  评论(0)  编辑  收藏  举报