How to display an image on a label from a folder containing images.

[qt_user]

I have to display a number of images from a folder in bin onto a label or any other widget with an alterable frame rate??

[grabalon]

What have you tried?

[qt_user]

thanx for showing concern...............................
I am able to display a single image from a folder onto a label but don't know how to go beyond that. I mean how would I get a slide show kind of a thing??

[aamer4yu]

Have a look at QTimer

Also if you are using 4.6.3, you have animation classes,, but try the timer thing first

[kremuwa]

Create a QTimer, connect its timeout() signal to the slot in which you'll change the images. In such slot you should use setPixmap function.
Example:

QTimer *slideShow = new QTimer(this);
connect(slideShow,SIGNAL(timeout()),this,SLOT(changePixmap()));
//...
MainWindow::changePixmap()
{
        ui.labelName.setPixmap(QPixmap("C:/path_to_image/imageName" + QString.setNum(imgNum) + ".ext")); //imgNum can be for example a private object of MainWindow class
        imgNum = (imgNum + 1) % 10 //for a series of 10 images with names "imageName(0-9).ext"
}

QTimer *slideShow = new QTimer(this);
connect(slideShow,SIGNAL(timeout()),this,SLOT(changePixmap()));
//...
MainWindow::changePixmap()
{
        ui.labelName.setPixmap(QPixmap("C:/path_to_image/imageName" + QString.setNum(imgNum) + ".ext")); //imgNum can be for example a private object of MainWindow class
        imgNum = (imgNum + 1) % 10 //for a series of 10 images with names "imageName(0-9).ext"
}

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[qt_user]

Create a QTimer, connect its timeout() signal to the slot in which you'll change the images. In such slot you should use setPixmap function.
Example:

QTimer *slideShow = new QTimer(this);
connect(slideShow,SIGNAL(timeout()),this,SLOT(changePixmap()));
//...
MainWindow::changePixmap()
{
        ui.labelName.setPixmap(QPixmap("C:/path_to_image/imageName" + QString.setNum(imgNum) + ".ext")); //imgNum can be for example a private object of MainWindow class
        imgNum = (imgNum + 1) % 10 //for a series of 10 images with names "imageName(0-9).ext"
}

QTimer *slideShow = new QTimer(this);
connect(slideShow,SIGNAL(timeout()),this,SLOT(changePixmap()));
//...
MainWindow::changePixmap()
{
        ui.labelName.setPixmap(QPixmap("C:/path_to_image/imageName" + QString.setNum(imgNum) + ".ext")); //imgNum can be for example a private object of MainWindow class
        imgNum = (imgNum + 1) % 10 //for a series of 10 images with names "imageName(0-9).ext"
}

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I have implemented it as :
// MainWindow.cpp consists of this snippet:

QTimer *timer = new QTimer;

QStringList fileName = QFileDialog::getOpenFileNames(this,
tr("Open Image"), "C:/qt-win-opensource-src-4.5.0/bin/", tr("Image Files (*.png *.jpg *.bmp *.avi *.gif)"));

QStringListIterator iterator(fileName);
label = new QLabel;
connect(timer,SIGNAL(timeout()),this,SLOT(nextPict ure(QStringListIterator&)));
timer->start(5000);


//And the slot nextPicture is defined as:
void MainWindow::nextPicture(QStringListIterator& iterator)
{
if(iterator.hasNext())
{
label->clear();
label->setPixmap(QPixmap(iterator.next()));
workspace->addWindow(label);
label->show();
}
}
But this is not displaying even a single image(which was getting displayed earlier).
Thanx in advance.

[aamer4yu]

connect(timer,SIGNAL(timeout()),this,SLOT(nextPict ure(QStringListIterator&)));

You cannot connect that. It must be returning false.

The slot MUST have equal to or less than arguments than the signal, and each argument matching like in functions..