Qt每3秒把程序最前显示一次，只是调整Z序列

相关资料：

https://www.bbsmax.com/A/l1dymbEbde/     Qt主窗体显示最前

https://download.csdn.net/download/zhujianqiangqq/19821845    代码包下载

实例：

.pro

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++11

# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += 
    main.cpp 
    mainwindow.cpp

HEADERS += 
    mainwindow.h

FORMS += 
    mainwindow.ui

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

main.cpp

#include "mainwindow.h"

#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    return a.exec();
}

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QTimer>

QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

private:
    void on_TimerEvent();

private:
    Ui::MainWindow *ui;
    QTimer *m_pTimer = NULL;
};
#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"

#ifdef Q_OS_WIN
#pragma comment(lib, "user32.lib")
#include <qt_windows.h>
#endif

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    m_pTimer = new QTimer(this);
    m_pTimer->setSingleShot(false);
    m_pTimer->start(3000);// 每3秒后最新显示一次
    connect(m_pTimer, &QTimer::timeout, this, &MainWindow::on_TimerEvent);
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::on_TimerEvent()
{
    if (this->isMinimized())
    {
        this->showNormal();
    }
    // 设置窗口置顶
    ::SetWindowPos(HWND(this->winId()), HWND_TOPMOST, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE | SWP_SHOWWINDOW);
    // 恢复普通窗口
    ::SetWindowPos(HWND(this->winId()), HWND_NOTOPMOST, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE | SWP_SHOWWINDOW);

    this->show();
    this->activateWindow();
}