Time delay in loading progress bar (GIF Format)

[jsulm]

@sankarapandiyan There is an easy way to move some work into another thread: https://doc.qt.io/qt-5/qtconcurrentrun.html

[JonB]

@jsulm
I don't want to sully this discussion, but could you just give a quick "yes" or "no" to my

But in any case, is it safe to use processEvents() inside a slot? Won't that potentially mess things up?

e.g. can't user press button a second time while in slot for first time and cause havoc?

[jsulm]

@JonB said in Time delay in loading progress bar (GIF Format):

e.g. can't user press button a second time while in slot for first time and cause havoc?

I guess he/she can :-)
But same applies to using thread: you have to make sure you don't trigger the same action when it is already being executed. Not hard to implement (disconnect the slot or use a guard variable).

[sankarapandiyan]

@jsulm @JonB I have used process event( ), And i get a output what i want .. But at last both the progress bar gif windows and task windows are closed automatically .Here i want to hide a progress bar gif window at last , but here both windows are closed . So how to fix this problem .

this is my code

void MainWindow::on_pushButton_4_clicked()
{
    QMovie*movie=new QMovie(":/somegif.gif");
    qDebug() << "test1";
        if(!movie->isValid()){
            //something went Wrong
            return;
        }
        //play GIF
        auto label=new QLabel();
        label->resize(400,180);
        label->setMovie(movie);
        label->show();
        movie->start();

        QTimer*timer=new QTimer(this);
        connect(timer,SIGNAL(timeout()),this,SLOT(PrintDebugInTimer()));
        timer->start(1000);
        //start time to close it after 10 sec
        QTimer::singleShot(10000,[label,&timer]{
           // label->close();
            label->deleteLater();
            timer->stop();
        });

    Mat image = imread("/home/pi/test.jpg");
    //Rect myROI(445, 745, 400, 400);
    //Mat crop = image(myROI);
    //imwrite("/home/pi/1.png", crop);
    Mat roi1 = image( Rect(2000,730,400,400));
    Mat roi2 = image( Rect(1220,720,400,400));
    Mat roi3 = image( Rect(445,745,400,400));
    imwrite("/home/pi/1.png", roi1);
    imwrite("/home/pi/2.png", roi2);
    imwrite("/home/pi/3.png", roi3);

    digitalWrite(7,LOW);
    digitalWrite(5,HIGH);

    for(int i=0;i<(35*50);i++)
    {
        QCoreApplication::processEvents();

        digitalWrite(4,1);
        //delay(0.5);//for milliseconds
        usleep(250);//for micro seconds
        digitalWrite(4,0);
        //delay(0.5);//for milliseconds
        usleep(250);//for micro seconds
    }
    digitalWrite(7,HIGH);
    popMessageBox();
    Mat image1 = imread("/home/pi/test.jpg");
    Mat roi4 = image1( Rect(2000,730,400,400));
    Mat roi5 = image1( Rect(1220,720,400,400));
    Mat roi6 = image1( Rect(445,745,400,400));
    imwrite("/home/pi/4.png", roi4);
    imwrite("/home/pi/5.png", roi5);
    imwrite("/home/pi/6.png", roi6);
    digitalWrite(7,LOW);
    digitalWrite(5,HIGH);

    for(int i=0;i<(34*50);i++)
    {
        QCoreApplication::processEvents();

        digitalWrite(4,1);
        //delay(0.5);//for milliseconds
        usleep(250);//for micro seconds
        digitalWrite(4,0);
        //delay(0.5);//for milliseconds
        usleep(250);//for micro seconds
    }
    digitalWrite(7,HIGH);
    popMessageBox();
    Mat image2 = imread("/home/pi/test.jpg");
    Mat roi7 = image2( Rect(2000,730,400,400));
    Mat roi8 = image2( Rect(1220,720,400,400));
    Mat roi9 = image2( Rect(445,745,400,400));
    imwrite("/home/pi/7.png", roi7);
    imwrite("/home/pi/8.png", roi8);
    imwrite("/home/pi/9.png", roi9);
    digitalWrite(7,LOW);
    digitalWrite(5,HIGH);

    for(int i=0;i<(34*50);i++)
    {
        QCoreApplication::processEvents();

        digitalWrite(4,1);
        //delay(0.5);//for milliseconds
        usleep(250);//for micro seconds
        digitalWrite(4,0);
        //delay(0.5);//for milliseconds
        usleep(250);//for micro seconds
    }
    digitalWrite(7,HIGH);
    popMessageBox();
    Mat image3 = imread("/home/pi/test.jpg");
    Mat roi10 = image3( Rect(2000,730,400,400));
    Mat roi11 = image3( Rect(1220,720,400,400));
    imwrite("/home/pi/10.png", roi10);
    imwrite("/home/pi/11.png", roi11);

    QPixmap pix1,pix2,pix3,pix4,pix5,pix6,pix7,pix8,pix9,pix10,pix11;
    pix1.load("/home/pi/11.png");
    pix2.load("/home/pi/10.png");
    pix3.load("/home/pi/9.png");
    pix4.load("/home/pi/8.png");
    pix5.load("/home/pi/7.png");
    pix6.load("/home/pi/6.png");
    pix7.load("/home/pi/5.png");
    pix8.load("/home/pi/4.png");
    pix9.load("/home/pi/3.png");
    pix10.load("/home/pi/2.png");
    pix11.load("/home/pi/1.png");
    pix1 = pix1.scaled(100, 100, Qt::KeepAspectRatio, Qt::SmoothTransformation);
    pix2 = pix2.scaled(100, 100, Qt::KeepAspectRatio, Qt::SmoothTransformation);
    pix3 = pix3.scaled(100, 100, Qt::KeepAspectRatio, Qt::SmoothTransformation);
    pix4 = pix4.scaled(100, 100, Qt::KeepAspectRatio, Qt::SmoothTransformation);
    pix5 = pix5.scaled(100, 100, Qt::KeepAspectRatio, Qt::SmoothTransformation);
    pix6 = pix6.scaled(100, 100, Qt::KeepAspectRatio, Qt::SmoothTransformation);
    pix7 = pix7.scaled(100, 100, Qt::KeepAspectRatio, Qt::SmoothTransformation);
    pix8 = pix8.scaled(100, 100, Qt::KeepAspectRatio, Qt::SmoothTransformation);
    pix9 = pix9.scaled(100, 100, Qt::KeepAspectRatio, Qt::SmoothTransformation);
    pix10 = pix10.scaled(100, 100, Qt::KeepAspectRatio, Qt::SmoothTransformation);



    ui->label_3->setPixmap(pix1);
    ui->label_4->setPixmap(pix2);
    ui->label_5->setPixmap(pix3);
    ui->label_6->setPixmap(pix4);
    ui->label_7->setPixmap(pix5);
    ui->label_8->setPixmap(pix6);
    ui->label_9->setPixmap(pix7);
    ui->label_10->setPixmap(pix8);
    ui->label_11->setPixmap(pix9);
    ui->label_12->setPixmap(pix10);
    ui->label_13->setPixmap(pix11);
    Scalar meanValue;
    meanValue = mean(roi1);
    
    qDebug()<<meanValue[0];
    qDebug()<<meanValue[1];
    qDebug()<<meanValue[2];


}

[jsulm]

@sankarapandiyan said in Time delay in loading progress bar (GIF Format):

So how to fix this problem

Sorry I don't understand you. What exactly do you want to close and when?

[sankarapandiyan]

@jsulm actually the push button (in the First window )pressed the progress bar runs first , After loading the progress bar window ( second window ). while closing second window simultaneously the first and second windows closed together , But what i want is i need to stay the ( First window ) on rest . i dont want to close ...

[jsulm]

@sankarapandiyan Sorry, without code I have no idea...

[sankarapandiyan]

@jsulm @JonB @small_bird @mrjj

void MainWindow::on_pushButton_4_clicked()
{
    QMovie*movie=new QMovie(":/somegif.gif");
    qDebug() << "test1";
        if(!movie->isValid()){
            //something went Wrong
            return;
        }
        //play GIF
        auto label=new QLabel();
        label->resize(400,180);
        label->setMovie(movie);
        label->show();
        movie->start();

        QTimer*timer=new QTimer(this);
        connect(timer,SIGNAL(timeout()),this,SLOT(PrintDebugInTimer()));
        timer->start(1000);
        //start time to close it after 10 sec
        QTimer::singleShot(10000,[label,&timer]{
           // label->close();
            label->deleteLater();
            timer->stop();
        });

    Mat image = imread("/home/pi/test.jpg");
    //Rect myROI(445, 745, 400, 400);
    //Mat crop = image(myROI);
    //imwrite("/home/pi/1.png", crop);
    Mat roi1 = image( Rect(2000,730,400,400));
    Mat roi2 = image( Rect(1220,720,400,400));
    Mat roi3 = image( Rect(445,745,400,400));
    imwrite("/home/pi/1.png", roi1);
    imwrite("/home/pi/2.png", roi2);
    imwrite("/home/pi/3.png", roi3);

    digitalWrite(7,LOW);
    digitalWrite(5,HIGH);

    for(int i=0;i<(35*50);i++)
    {
        QCoreApplication::processEvents();

        digitalWrite(4,1);
        //delay(0.5);//for milliseconds
        usleep(250);//for micro seconds
        digitalWrite(4,0);
        //delay(0.5);//for milliseconds
        usleep(250);//for micro seconds
    }
    digitalWrite(7,HIGH);
    popMessageBox();
    Mat image1 = imread("/home/pi/test.jpg");
    Mat roi4 = image1( Rect(2000,730,400,400));
    Mat roi5 = image1( Rect(1220,720,400,400));
    Mat roi6 = image1( Rect(445,745,400,400));
    imwrite("/home/pi/4.png", roi4);
    imwrite("/home/pi/5.png", roi5);
    imwrite("/home/pi/6.png", roi6);
    digitalWrite(7,LOW);
    digitalWrite(5,HIGH);

    for(int i=0;i<(34*50);i++)
    {
        QCoreApplication::processEvents();

        digitalWrite(4,1);
        //delay(0.5);//for milliseconds
        usleep(250);//for micro seconds
        digitalWrite(4,0);
        //delay(0.5);//for milliseconds
        usleep(250);//for micro seconds
    }
    digitalWrite(7,HIGH);
    popMessageBox();
    Mat image2 = imread("/home/pi/test.jpg");
    Mat roi7 = image2( Rect(2000,730,400,400));
    Mat roi8 = image2( Rect(1220,720,400,400));
    Mat roi9 = image2( Rect(445,745,400,400));
    imwrite("/home/pi/7.png", roi7);
    imwrite("/home/pi/8.png", roi8);
    imwrite("/home/pi/9.png", roi9);
    digitalWrite(7,LOW);
    digitalWrite(5,HIGH);

    for(int i=0;i<(34*50);i++)
    {
        QCoreApplication::processEvents();

        digitalWrite(4,1);
        //delay(0.5);//for milliseconds
        usleep(250);//for micro seconds
        digitalWrite(4,0);
        //delay(0.5);//for milliseconds
        usleep(250);//for micro seconds
    }
    digitalWrite(7,HIGH);
    popMessageBox();
    Mat image3 = imread("/home/pi/test.jpg");
    Mat roi10 = image3( Rect(2000,730,400,400));
    Mat roi11 = image3( Rect(1220,720,400,400));
    imwrite("/home/pi/10.png", roi10);
    imwrite("/home/pi/11.png", roi11);

    QPixmap pix1,pix2,pix3,pix4,pix5,pix6,pix7,pix8,pix9,pix10,pix11;
    pix1.load("/home/pi/11.png");
    pix2.load("/home/pi/10.png");
    pix3.load("/home/pi/9.png");
    pix4.load("/home/pi/8.png");
    pix5.load("/home/pi/7.png");
    pix6.load("/home/pi/6.png");
    pix7.load("/home/pi/5.png");
    pix8.load("/home/pi/4.png");
    pix9.load("/home/pi/3.png");
    pix10.load("/home/pi/2.png");
    pix11.load("/home/pi/1.png");
    pix1 = pix1.scaled(100, 100, Qt::KeepAspectRatio, Qt::SmoothTransformation);
    pix2 = pix2.scaled(100, 100, Qt::KeepAspectRatio, Qt::SmoothTransformation);
    pix3 = pix3.scaled(100, 100, Qt::KeepAspectRatio, Qt::SmoothTransformation);
    pix4 = pix4.scaled(100, 100, Qt::KeepAspectRatio, Qt::SmoothTransformation);
    pix5 = pix5.scaled(100, 100, Qt::KeepAspectRatio, Qt::SmoothTransformation);
    pix6 = pix6.scaled(100, 100, Qt::KeepAspectRatio, Qt::SmoothTransformation);
    pix7 = pix7.scaled(100, 100, Qt::KeepAspectRatio, Qt::SmoothTransformation);
    pix8 = pix8.scaled(100, 100, Qt::KeepAspectRatio, Qt::SmoothTransformation);
    pix9 = pix9.scaled(100, 100, Qt::KeepAspectRatio, Qt::SmoothTransformation);
    pix10 = pix10.scaled(100, 100, Qt::KeepAspectRatio, Qt::SmoothTransformation);



    ui->label_3->setPixmap(pix1);
    ui->label_4->setPixmap(pix2);
    ui->label_5->setPixmap(pix3);
    ui->label_6->setPixmap(pix4);
    ui->label_7->setPixmap(pix5);
    ui->label_8->setPixmap(pix6);
    ui->label_9->setPixmap(pix7);
    ui->label_10->setPixmap(pix8);
    ui->label_11->setPixmap(pix9);
    ui->label_12->setPixmap(pix10);
    ui->label_13->setPixmap(pix11);
    Scalar meanValue;
    meanValue = mean(roi1);
    
    qDebug()<<meanValue[0];
    qDebug()<<meanValue[1];
    qDebug()<<meanValue[2];


}

this is my output
i have checked

with q debug

https://postimg.cc/gallery/1e0w5cul2/

This is my code and this is my out put

[jsulm]

@sankarapandiyan Well, your app is actually crashing. The code is pretty messy to be honest.

QTimer*timer=new QTimer(this);
connect(timer,SIGNAL(timeout()),this,SLOT(PrintDebugInTimer()));
timer->start(1000);
//start time to close it after 10 sec
QTimer::singleShot(10000,[label,&timer]{
// label->close();
    label->deleteLater();
    timer->stop(); // It crashes here. Means timer is already destroyed - do you delete it or its parent somewhere?
});

[sankarapandiyan]

This post is deleted!

[sankarapandiyan]

@jsulm said in Time delay in loading progress bar (GIF Format):

It crashes here. Means timer is already destroyed

You are Absolutely Right!!!!!!

Now its Works .. Great Thanks ................ @jsulm @mrjj @JonB