Screen Capture Example

Screen Capture demonstrates how to capture a screen using QScreenCapture. The example shows a list of screens and a live preview of the selected item using a QMediaCaptureSession and a QVideoWidget. There is also a button to start and stop the capturing.

Running the Example

To run the example from Qt Creator, open the Welcome mode and select the example from Examples. For more information, visit Building and Running an Example.

Application Structure

The example consists of two custom classes. The UI and all screen capture functionality is implemented in the class ScreenCapturePreview. The class ScreenListModel only serves as a model behind the QListView widget. The main function creates a ScreenCapturePreview object, which in turn creates an instance of QScreenCapture, QMediaCaptureSession and QVideoWidget in addition to all the UI widgets.

The list is populated with the return value of QGuiApplication::screens().

When a list item is selected, it is connected to the QScreenCapture object with QScreenCapture::setScreen(). The QScreenCapture object is connected to the QMediaCaptureSession object with QMediaCaptureSession::setScreenCapture(), which in turn is connected to the QVideoWidget object with QMediaCaptureSession::setVideoOutput(). Thus the screen capture output is previewed in the video widget on the right hand side of the UI.

The start/stop button calls QScreenCapture::start() and QScreenCapture::stop().

A QMessageBox pops up if the QScreenCapture::errorOccurred signal is emitted.

Example project @ code.qt.io