我一直在尝试让这个简单的示例使用由按钮激活的线程来工作。它基于以下问题的解决方案:
How to implement frequent start/stop of a thread (QThread)
上面的示例解决方案和我下面的代码之间的主要区别是:
- 我使用了 QWidget 而不是 MainWindow
- 为了清楚起见,我更改了信号的名称
- 我的代码包含调试信息
- 我尝试消除 worker 创建的信号,因为它们似乎没有做任何事情
开始/停止信号似乎没有触发它们相应的插槽,但我没有足够的经验来解决原因。
此外,我不确定信号的用途:
SignalToObj_mainThreadGUI()
那只是可以使用而不能使用的东西吗?
一段时间以来,我一直在尝试让这段代码正常工作,因此非常感谢任何帮助。
main.cpp
#include "threadtest.h" #include <QApplication> int main(int argc, char *argv[]) { QApplication a(argc, argv); ThreadTest w; w.show(); return a.exec(); }
线程测试.h
#include <QWidget> #include <QThread> #include "worker.h" namespace Ui { class ThreadTest; } class ThreadTest : public QWidget { Q_OBJECT public: explicit ThreadTest(QWidget *parent = 0); ~ThreadTest(); signals: void startWorkSignal(); void stopWorkSignal(); private slots: void on_startButton_clicked(); void on_stopButton_clicked(); private: Ui::ThreadTest *ui; worker *myWorker; QThread *WorkerThread; };
线程测试.cpp
#include "threadtest.h" #include "ui_threadtest.h" ThreadTest::ThreadTest(QWidget *parent) : QWidget(parent), ui(new Ui::ThreadTest) { ui->setupUi(this); myWorker = new worker; WorkerThread = new QThread; myWorker->moveToThread(WorkerThread); connect(this, SIGNAL(startWorkSignal()), myWorker, SLOT(StartWork()) ); connect(this, SIGNAL(stopWorkSignal()), myWorker, SLOT(StopWork()) ); //Debug this->dumpObjectInfo(); myWorker->dumpObjectInfo(); } ThreadTest::~ThreadTest() { delete ui; } void ThreadTest::on_startButton_clicked() { qDebug() << "startwork signal emmitted"; emit startWorkSignal(); } void ThreadTest::on_stopButton_clicked() { qDebug() << "stopwork signal emmitted"; emit stopWorkSignal(); }
worker.h
#include <QObject> #include <QDebug> class worker : public QObject { Q_OBJECT public: explicit worker(QObject *parent = 0); ~worker(); signals: void SignalToObj_mainThreadGUI(); //void running(); //void stopped(); public slots: void StopWork(); void StartWork(); private slots: void do_Work(); private: volatile bool running, stopped; };
worker.cpp
#include "worker.h" worker::worker(QObject *parent) : QObject(parent), stopped(false), running(false) { qDebug() << "running: " << running; qDebug() << "stopped: " << stopped; } worker::~worker() {} void worker::do_Work() { qDebug() << "inside do Work"; emit SignalToObj_mainThreadGUI(); if (!running || stopped) return; // actual work here /* for (int i = 0; i < 100; i++) { qDebug() << "count: " + i; } */ QMetaObject::invokeMethod(this, "do_Work", Qt::QueuedConnection); } void worker::StopWork() { qDebug() << "inside StopWork"; stopped = true; running = false; //emit stopped(); } void worker::StartWork() { qDebug() << "inside StartWork"; stopped = false; running = true; //emit running(); do_Work(); }
最佳答案
你应该写
WorkerThread->start();
或者您可以使用 ThreadTest 对象的线程来代替 WorkerThread(在这种情况下不需要 WorkerThread):
myWorker->moveToThread(thread()); // this->thread
关于c++ - Qt - 使用由按钮控制的线程的简单示例,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/31281361/