qt 多线程

兼容适配 软件兼容
1 
    //*************dialog.h**************//
   #ifndef DIALOG_H  
   #define DIALOG_H  
   #include <QDialog>  
   #define MAXSIZE 5  //最大的线程数  
   class QDialogButtonBox;  
   class QProgressBar;  
   class QPushButton;  
   class WorkThread;  
   class ThreadDlg : public QDialog  
   {  
   Q_OBJECT  
   public:  
   ThreadDlg(QWidget *parent = 0);  
   public slots:  
   void start();     
   void stop();  
   private:  
   QPushButton *startButton;  
   QPushButton *quitButton;  
   QPushButton *stopButton;  
   QDialogButtonBox *buttonBox;  
   WorkThread* threadVector[MAXSIZE];  
   };  
   #endif  
   //***********end end end************//  

 
   //***********mainwindow.h************//  
   
   
   #ifndef WORKTHREAD_H  
   #define WORKTHREAD_H  
   #include <QThread>  
   class WorkThread : public QThread  
   {  
   protected:  
   void run();   //重新实现run()函数  
   };  
   
   #endif  
   //***********end end end************//  


   //***********dialog.cpp************//  
   
   
   #include <QtGui>  
   #include "workThread.h"  
   #include "dialog.h"  
   
   ThreadDlg::ThreadDlg(QWidget *parent)       
   : QDialog(parent)  
   {  
   startButton = new QPushButton(tr("开始"));  
   quitButton = new QPushButton(tr("退出"));  
   stopButton = new QPushButton(tr("停止"));  
   stopButton->setEnabled(false);  
   buttonBox = new QDialogButtonBox;  
   buttonBox->addButton(startButton, QDialogButtonBox::ActionRole);  
   buttonBox->addButton(stopButton, QDialogButtonBox::ActionRole);  
   buttonBox->addButton(quitButton, QDialogButtonBox::RejectRole);  
   connect(startButton, SIGNAL(clicked()), this, SLOT(start()));  
   connect(quitButton, SIGNAL(clicked()), this, SLOT(close()));  
   connect(stopButton, SIGNAL(clicked()), this, SLOT(stop()));  
   QVBoxLayout *mainLayout = new QVBoxLayout;  
   mainLayout->addWidget(buttonBox);  
   setLayout(mainLayout);  
   setWindowTitle(tr("启动线程"));  
   }  
   void ThreadDlg::start()  
   {  
   for(int i=0;i<MAXSIZE;i++)  
   {  
   threadVector[i] = new WorkThread();   //创建线程  
   }  
   
   for(int i=0;i<MAXSIZE;i++)  
   {  
   threadVector[i]->start(QThread::LowestPriority);   //启动线程同时设置它的优先级，当然也可以不带，使用默认的优先级  
   }  
   stopButton->setEnabled(true);  
   startButton->setEnabled(false);  
   }  
   void ThreadDlg::stop()  
   {  
   for(int i=0;i<MAXSIZE;i++)  
   {  
   threadVector[i]->terminate();    //终止线程  
   threadVector[i]->wait();    //阻塞等待  
   }  
   startButton->setEnabled(true);  
   stopButton->setEnabled(false);  
   }  
   //***********end end end************//  


   //***********mainwindow.cpp************//
   
   #include "workThread.h"  
   #include "dialog.h"  
   #include <QTextEdit>  
   #include <QDebug>  
   #include <stdio.h>  
   void WorkThread::run()  
   {  
   while(true)  
   for (int n = 0; n < 10;++n) {  
   printf("%d\n",n);  //打印输出  
   }  
   }  
   
   //***********end end end************//  
   
   //***********main.cpp************//  
   
   
   #include <QApplication>  
   #include <QtCore>  
   #include "dialog.h"  
   int main(int argc, char *argv[])  
   {  
   QApplication app(argc, argv);  
   QTextCodec::setCodecForTr( QTextCodec::codecForName("gb2312"));   
   ThreadDlg dialog;  
   dialog.show();  
   return dialog.exec();  
   }  
   //***********end end end************//

其中的“threadVector[i]->terminate(); ”，terminate()函数的调用便不会立刻终止线程，因为线程的何时终止取决于系统的调度策略，所在在之后又调用了wait()函数是线程阻塞等待直到退出或者超时。
最后加以一点就是在.pro文件中加入一行代码才能成功运行：
CONFIG+=thread