QThread用法
采用Qt的QThread类编写多线程程序已经很长一段时间了,但是直到今天才发现一直都在错误的使用QThread,关于QThread的使用,有一句话总结得很好:
QThread 应该被看做是操作系统线程的接口或控制点,而不应该包含需要在新线程中运行的代码。需要运行的代码应该放到一个QObject的子类中,然后将该子类的对象moveToThread到新线程中。
参考来源:http://hi.baidu.com/dbzhang800/item/c14c97dd15318d17e1f46f41
一段参考代码如下:
#include <QtCore/QCoreApplication> #include <QtCore/QObject> #include <QtCore/QThread> #include <QtCore/QDebug> class Dummy:public QObject { Q_OBJECT public: Dummy(QObject* parent=0):QObject(parent) {} public slots: void emitsig() { emit sig(); } signals: void sig(); }; class Object:public QObject { Q_OBJECT public: Object(){} public slots: void slot() { qDebug()<<"from thread slot:" <<QThread::currentThreadId(); } }; #include "main.moc" int main(int argc, char *argv[]) { QCoreApplication a(argc, argv); qDebug()<<"main thread:"<<QThread::currentThreadId(); QThread thread; Object obj; Dummy dummy; obj.moveToThread(&thread); QObject::connect(&dummy, SIGNAL(sig()), &obj, SLOT(slot())); thread.start(); dummy.emitsig(); return a.exec(); }
代码来源:http://hi.baidu.com/dbzhang800/item/1e931317d37d71dcbe904247