Qt 中开启线程的多种方式小结

class Thread : public QThread
{
    Q_OBJECT
public:
	virtual void run() override;
}

void Thread::run()
{
	...
}

class Test : public QObject
{
    Q_OBJECT
public:
    void test();
}

QThread th;
Test test;
test.moveToThread(&th);

#include <QObject>
#include <QRunnable>
#include <QThread>
#include <QThreadPool>
#include <QDebug>

class BPrint : public QRunnable
{
	void run()
	{
	    for ( int count = 0; count < 5; ++count )
	    {
			qDebug() << QThread::currentThread();
			QThread::msleep(1000);
	    }
	}
};

int main(int arGC, char *argv[])
{
	QCoreApplication a(argc, argv);
 
	QThreadPool threadpool;	           		// 构建一个本地的线程池
	threadpool.setMaxThreadCount(3);        // 线程池中最大的线程数
	
    for ( int num = 0; num < 100; ++num )
	{
	    BPrint *print;    					// 循环构建可在线程池中运行的任务
	    threadpool.start(print);      		// 线程池分配一个线程运行该任务
	    QThread::msleep(1000);
	}
	
	return a.exec();
}

#include <thread>
void threadfun1()
{
    std::cout << "threadfun1 - 1\r\n" << std::endl;
    std::this_thread::sleep_for(std::chrono::seconds(1));
    std::cout << "threadfun1 - 2" << std::endl;
}

void threadfun2(int iParam, std::string sParam)
{
    std::cout << "threadfun2 - 1" << std::endl;
    std::this_thread::sleep_for(std::chrono::seconds(5));
    std::cout << "threadfun2 - 2" << std::endl;
}

int main()
{
    std::thread t1(threadfun1);
    std::thread t2(threadfun2, 10, "abc");
    t1.join();		// 等待线程 t1 执行完毕
    std::cout << "join" << std::endl;
    t2.detach();	// 将线程 t2 与主线程分离
    std::cout << "detach" << std::endl;
}

运行结果：
threadfun1 - 1
threadfun2 - 1

threadfun1 - 2
join
detach

extern void func();
QFuture<void> future = QtConcurrent::run(func);

extern void FuncWithArguments(int arg1, const QString &string);

int integer = ...;
QString string = ...;
// 需要传递的参数，则跟在函数名之后，依次加入
QFuture<void> future = QtConcurrent::run(FuncWithArguments, integer, string);

extern QString Func(const QByteArray &input);

QByteArray byte_array = ...;
QFuture<QString> future = QtConcurrent::run(func, byte_array);
...
QString result = future.result();

QByteArray bytearray = "hello world";
// 在一个单独的线程中，调用 QByteArray 的常量成员函数 split()，传递给 run() 函数的参数是 bytearray
QFuture< QList<QByteArray> > future = QtConcurrent::run(bytearray, &QByteArray::split, ',');
...
QList<QByteArray> result = future.result();

QImage image = ...;
// 在一个单独的线程中，调用 QImage 的非常量成员函数 invertPixels()，传递给 run() 函数的参数是 &image
QFuture<void> future = QtConcurrent::run(&image, &QImage::invertPixels, QImage::InvertRgba);
...
future.waitForFinished();

#include <QFuture>
#include <QtConcurrent>
#include <QThreadPool>

QThreadPool pool;
QFuture<void> future = QtConcurrent::run(&pool, [&](QObject *receiver){
    cv::Mat mat = QYImageProcessing::convertQImageToMat(image);
    cv::Mat center = cv::imread("dynaPhase_center.png");
    
    dynaPhase_alive = QYImageProcessing::getDiffPoint(mat, center);
    
    // 根据三个点自适应模拟条纹
    cv::Mat ret = DynamicCarrier::DC_Adaptive_Simulation(dynaPhase_center, dynaPhase_alive, dynaPhase_align);
    ret = ret*255;
    ret.convertTo(ret, CV_8UC1);
    QImage adaptive = QYImageProcessing::convertMatToQImage(ret);
    
    QYAlignControl *align = static_cast<QYAlignControl *>(receiver);
    align->callQmlGetAlivePoint(adaptive, dynaPhase_alive.x, dynaPhase_alive.y);
}, this);