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<< Click to display table of contents >> TRVCamera.VideoDeviceIndex, VideoDeviceCount, VideoDeviceList, VideoDeviceIdList |
Properties controlling USB webcams and monitors (displays).
property VideoDeviceIndex: Integer;
property VideoDeviceCount: Integer; // read-only
property VideoDeviceList[Index: Integer]: String; // read-only
property VideoDeviceIdList[Index : Integer]: String; // read-only
These properties are used if DeviceType=rvdtWebCamera or rvdtDesktop. VideoDeviceIdList is used only for web cameras.
DeviceType=rvdtWebCamera
VideoDeviceCount returns the count of webcams (video capture devices).
VideoDeviceList[Index] (where Index is in the range 0..VideoDeviceCount-1) returns names of webcams. These names can be shown to users in the application UI.
VideoDeviceIdList[Index] (where Index is in the range 0..VideoDeviceCount-1) returns identifiers of webcams. These identifiers are unique on the computer.
Assign a value in the range 0..VideoDeviceCount-1 to VideoDeviceIndex to choose the webcam.
To play video from the camera, call PlayVideoStream.
DeviceType=rvdtDesktop
VideoDeviceCount returns the count of monitors + 1.
The 0-th device corresponds to the whole desktop, the indexes from 1 to VideoDeviceCount-1 correspond to monitors (the i-th device corresponds to Screen.Monitors[i-1]).
VideoDeviceList[Index] (where Index is in the range 0..VideoDeviceCount-1) returns a description of a device (a desktop or a monitor).
Assign a value in the range 0..VideoDeviceCount-1 to VideoDeviceIndex to choose the desktop or a monitor as a video source (if DesktopMode=rvdmFull)
To play video from the desktop, call PlayVideoStream.
[FMX note]: in FireMonkey, multiple monitors are supported since Delphi XE7. For Delphi XE6, VideoDeviceCount returns 1 and VideoDeviceList[0] returns the description of the primary monitor.
See also
•TRVWebCamDialog component