Method OpenVideoMixProjectorAsync

Opens a projector of the preview, the program or the multiview of OBS Studio, and returns when OBS Studio has answered.

public Task OpenVideoMixProjectorAsync(MixType mix, int? monitorIndex = null, string? geometry = null, CancellationToken cancellationToken = default)

mix MixType: What the projector shows.
monitorIndex int?: The index of the monitor that the projector fills (see GetMonitorsAsync(CancellationToken)), or null (or -1) for a window.
geometry string: The position and size of the window, as Qt writes them (base64), for a projector in a window; it can not be given together with a monitor, or null.
cancellationToken CancellationToken: A token that ends the wait. A change that was not sent yet is not sent.

It changes nothing in the model, so the call does not wait for it. See SetEnabledAsync(bool, CancellationToken) for the order of changes.

ObsNotConnectedException: There is no connection to OBS Studio. Nothing was changed.
ObsNotReadyException: OBS Studio is changing its scene collection, or did so after the call. Nothing was changed.
ObsUnknownOutcomeException: OBS Studio did not answer in time, or the connection ended: it is not known whether it opened the projector.
ObsResponseException: OBS Studio refused the request (a monitor and a geometry were both given, or the monitor does not exist).