正文
线程.Qt更新界面
小程序：扫一扫查出行【扫一扫了解最新限行尾号】
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1、信号&槽 机制 即可
ZC：个人暂时 测试下来，类似是 PostMessage(...)的方式：
a、是在各自的线程中执行代码，
b、调用 emit不耗时（指的意思是 像调用PostMessage(...)一样 扔完就算，具体 slot中需要执行多久 不关“emit ???()”的事）
2、测试代码：
2.1、h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H#include <QMainWindow>
#include <QThread>namespace Ui {
class MainWindow;
}class MainWindow : public QMainWindow
{
Q_OBJECTpublic:
explicit MainWindow(QWidget *parent = nullptr);
~MainWindow();private slots: void slot01(); void on_pushButton_3_clicked();private:
Ui::MainWindow *ui; int FiCnt;
public:
void UpdateCnt();
};class TthreadZ :public QThread
{
Q_OBJECT
public:
explicit TthreadZ(QObject *parent = ){}
~TthreadZ(){}protected:
void run();signals:
void signal01();};#endif // MAINWINDOW_H
2.2、cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"#include "UdpSocket_ClientZ.h"#include <QThread>
#include <Windows.h>MainWindow *g_pMainWindow = nullptr;void TthreadZ::run()
{
while ()
{
DWORD dwThreadId = ::GetCurrentThreadId(); DWORD dw1 = ::GetTickCount();
emit signal01();
DWORD dw2 = ::GetTickCount(); qDebug() << "TthreadZ.dwThreadId : " << dwThreadId << ". Take time : " << dw1 << " --> " << dw2 << " : " << (dw2-dw1)<<"ms";// if (g_pMainWindow != nullptr)
// g_pMainWindow->UpdateCnt(); Sleep();
qDebug() << "";
}
}MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this); g_pMainWindow = this;
}MainWindow::~MainWindow()
{
delete ui;
}void MainWindow::slot01()
{
DWORD dwThreadId = ::GetCurrentThreadId(); DWORD dw1 = ::GetTickCount();
UpdateCnt();
DWORD dw2 = ::GetTickCount(); qDebug() << "MainWindow.dwThreadId : " << dwThreadId << ". Take time : " << dw1 << " --> " << dw2 << " : " << (dw2-dw1)<<"ms";
}void MainWindow::UpdateCnt()
{
FiCnt ++;
ui->plainTextEdit->appendPlainText(QString::number(FiCnt));
Sleep();
}void MainWindow::on_pushButton_3_clicked()
{
qDebug() << "on_pushButton_3_clicked(1)";
//UpdateCnt();
TthreadZ* p = new TthreadZ();
p->start(); qDebug() << "on_pushButton_3_clicked(2)";
connect(p, &TthreadZ::signal01, this, &MainWindow::slot01);// ZC: 注意这里的参数 函数指针
}
2.3、界面
2.4、控制台输出
on_pushButton_3_clicked(1)
on_pushButton_3_clicked(2)
TthreadZ.dwThreadId : 5344 . Take time : 3605015 --> 3605015 : 0 ms
MainWindow.dwThreadId : 4468 . Take time : 3605015 --> 3605515 : 500 msTthreadZ.dwThreadId : 5344 . Take time : 3606015 --> 3606015 : 0 ms
MainWindow.dwThreadId : 4468 . Take time : 3606015 --> 3606515 : 500 msTthreadZ.dwThreadId : 5344 . Take time : 3607015 --> 3607015 : 0 ms
MainWindow.dwThreadId : 4468 . Take time : 3607015 --> 3607515 : 500 msTthreadZ.dwThreadId : 5344 . Take time : 3608015 --> 3608015 : 0 ms
MainWindow.dwThreadId : 4468 . Take time : 3608015 --> 3608531 : 516 msTthreadZ.dwThreadId : 5344 . Take time : 3609015 --> 3609015 : 0 ms
MainWindow.dwThreadId : 4468 . Take time : 3609015 --> 3609531 : 516 ms
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