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OnPreviewStarted

event

Delphi
property OnPreviewStarted: TOnEventNotification read FOnPreviewStarted write FOnPreviewStarted;
C++Builder
__property TOnEventNotification OnPreviewStarted = {read=FOnPreviewStarted, write=FOnPreviewStarted};
typedef void __fastcall (__closure *TOnEventNotification)(System::TObject* Sender);
C#
public event EventHandler OnPreviewStarted;
VB.NET
Public Event OnPreviewStarted As EventHandler
C++/Qt
void SetOnPreviewStarted (TOnPreviewStartedCb OnPreviewStartedCb);
typedef void CALLBACK TOnPreviewStartedCb (void *Object, void *Sender);

Occurs after calling StartPreview, just before the first video frame is rendered.