一、说明
QFutureWatcher provides information and notifications about a QFuture. Use the setFuture() function to start watching a particular QFuture.
二、代码
1 #include "widget.h"
2 #include "ui_widget.h"
3 #include <QtConcurrent>
4 #include <QFuture>
5 #include <QFutureWatcher>
6 #include <QTimer>
7 #include <QDateTime>
8 Widget::Widget(QWidget *parent)
9 : QWidget(parent)
10 , ui(new Ui::Widget)
11 {
12 ui->setupUi(this);
13
14 QFutureWatcher<void> *pwatcher = new QFutureWatcher<void>;
15 connect(pwatcher, SIGNAL(finished()),
16 this, SLOT(on_finished()));
17
18 QFuture<void> f1 = QtConcurrent::run(hello,QString("demo1"));
19 QFuture<void> f2 = QtConcurrent::run([=]{
20 hello("demo2");
21 //延时
22 _sleep(3000);
23 });
24
25 pwatcher->setFuture(f2);
26 }
27
28 Widget::~Widget()
29 {
30 delete ui;
31 }
32
33 void Widget::hello(const QString &str)
34 {
35 qDebug()<<"Widget hello"<<str<<"from"<<QThread::currentThread();
36 }
37
38 void Widget::on_finished()
39 {
40 qDebug()<<"Widget QFuture f2 on_finished";
41 }
