Qt子线程传递数据到主线程简单实例

窗口文件cmainwindow.cpp
CMainWindow::CMainWindow(QWidget*parent):

QMainWindow(parent),

ui(newUi::CMainWindow)

{

ui->setupUi(this);
....

connect(threadA,SIGNAL(signalUpdateData(QString)),this,SLOT(slotUpdateDate(QString)),Qt::DirectConnection); // 事件同步传递
...
}

voidCMainWindow::slotUpdateDate(QStringtext)

{

qDebug("receivesignalshowMsg");

ui->label->setText(text);

}

线程文件csubthread.cpp：

voidCSubThread::run()

{

qDebug()<<"run";

while(!isStopped)

{

qDebug()<<this->objectName()<<"run...,"<<QTime::currentTime().toString();

emitsignalUpdateData(QTime::currentTime().toString());

qDebug("has post signal");

QThread::msleep(2000);

}
}

输入出：

"ThreadA" run..., "11:23:45"

receive signal showMsg

has post signal

"ThreadA" run..., "11:23:47"

receive signal showMsg

has post signal