开发环境 Qt5.5.1、Qt Creator 3.5.1
#include <QCoreApplication>
#include <QObject>
#include <QDebug>
#include <QThread>
#include <QThreadPool>
#include <QPointer>
class MyRunnable;
//事件类
class MyEvent: public QEvent {
public:
MyRunnable *m_runnable;
QString m_message;
MyEvent(MyRunnable *r, QString message): QEvent(eventType()), m_runnable(r), m_message(message) { }
static QEvent::Type eventType(){
if(s_eventType == QEvent::None) {
//注册一个自定义类型1000-65535
s_eventType = (QEvent::Type)registerEventType();
//qDebug()<<"registerEventType "<<(int)s_eventType;
}
return s_eventType;
}
private:
static QEvent::Type s_eventType;
};
QEvent::Type MyEvent::s_eventType = QEvent::None;
//线程的耗时操作
class MyRunnable :public QRunnable{
public:
MyRunnable(QObject* observer): m_observer(observer){
}
//Override
void run();
private:
//QPointer是为QObject对象提供保护指针的模板类
//一个保护指针 QPointer,行为类似正常的C++指针，只不过其在引用对象删除之后会自动设置为0. T必须是QObject的子类
//保护指针在你要保存别人创建的QObject对象，且有可能其已经被删除而你仍然持有其引用的时候非常有用。
//Qt也提供QSharedPointer,一个基于引用计数的共享指针对象实现，其能使用单个指针用于维护一个引用集合
//就是说，如果指代的对象被删除，则后面对该对象的所有操作不会执行，因此也不会抛异常
QPointer<QObject> m_observer;
};
//Override
void MyRunnable::run() {
QString message;
message.append(QString::number((int)QThread::currentThreadId())+" start\r\n");
message.append(QThread::currentThread()->objectName()+"\r\n");
QThread::sleep(1);
message.append(QString::number((int)QThread::currentThreadId())+" end\r\n");
QCoreApplication::postEvent(m_observer, new MyEvent(this, message));
}
//主程序中的消息处理程序
class MyProcesser: public QObject {
public:
MyProcesser() {
}
//Override
bool event(QEvent *);
void process();
void abort();
private:
QList<MyRunnable*> m_runnableList;
};
bool MyProcesser::event(QEvent *e) {
if(e->type() == MyEvent::eventType()) {
qDebug()<<"processer get event, type is "<<(int)e->type();
qDebug()<<((MyEvent*)e)->m_message;
m_runnableList.removeOne(((MyEvent*)e)->m_runnable);
}
}
void MyProcesser::process() {
MyRunnable* runnable = new MyRunnable(this);
m_runnableList.append(runnable);
//是否线程池替你删除
//If auto-deletion is enabled, QThreadPool will automatically delete this runnable after calling run();
//otherwise, ownership remains with the application programmer.
runnable->setAutoDelete(false);
QThreadPool::globalInstance()->start(runnable);
}
void MyProcesser::abort() {
int size = m_runnableList.size();
MyRunnable* r;
for(int i=0;i<size;i++) {
r = m_runnableList.at(i);
m_runnableList.removeAt(i);
}
}
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
qDebug()<<"main thread "<<QThread::currentThreadId()<<" start";
qDebug()<<"main thread "<<QThread::currentThread()->objectName();
MyProcesser processer;
processer.process();
processer.process();
return a.exec();
}