Dual display

overview It is possible to display 2 identical video windows, e.g. for a teacher to see the video preview on a 1st monitor, and for students to see the same video on a 2nd monitor in full screen mode.

The default video window is handled through the "Display_" properties and methods.

The 2nd video window is handled through the "DualDisplay_" identical properties and methods.

default video window By default, only the 1st video window is active (Display_Active = true) and the 2nd video window is disabled (DualDisplay_Active = false).

By default, the 1st video window is embedded in the TVideoGrabber control (Display_Embedded = true).

activation/deactivation of the dual display To activate the 2nd video window, enable DualDisplay_Active before calling StartPreview, StartRecording or OpenPlayer.

Then the 2nd video window can be shown or hidden when the preview/recording/playback is running by enabling or disabling DualDisplay_Visible.

multi-monitors display It is possible to send each video window on the monitor. Simply assign the Display_Monitor or DualDisplay_Monitor property with the index of the desired monitor.

2 global functions help to get information on the available monitors:

1) MonitorsCount returns the number of monitors available on the current platform.

Therefore Display_Monitor or DualDisplay_Monitor accept a value in the 0..MonitorsCount -1 range.

2) MonitorBounds returns the bounds of the specified monitor in the 0..MonitorsCount -1 range.

The bounds returned are intented to help to position the video window within the screen bounds.

window location

When it is not embedded (Display_Embedded = false), the video window:

• can by placed on the screen by assigning Display_Left and Display_Top,

• can be sized by assigning Display_Width and Display_Height.

However, rather than assigning these properties one by one, it is possible to set all of them at the same time by using Display_SetLocation.