FMX：控制手柄

Question

I'm working with DirectShow in firemonkey, and i have a problem with outputting Video.

iVideoWindow.Put_Owner(Panel1.Handle); 

I need handle of TPanel, to display video at it. But FMX controls have no handle. I know, that Firemonkey is not based on traditional windows and FMX do not provide this, but how to solve this problem? I have no idea, please, help me.

Answer 1

If you want to get a window handle as an HWND (windows api) type, you can now call this function:

WindowHandleToPlatform(form1.Handle).wnd

Put in your uses section:

uses
  FMX.Platform.Win;

Note that just calling WindowHandleToPlatform(form1.Handle) will not work, you have to access .wnd to obtain the winapi handle.

Since this makes an application less portable, it is also a good idea to put {$IFDEF MSWINDOWS} whenever doing this, and if you ever port to MacOS, you'll have to write code for that platform. Or put this code into a separate unit that deals with MS Windows related code only, and IFDEF the unit into your uses.

Answer 2

FmxHandleToHWND is marked deprecated now.

WindowHandleToPlatform will convert given FireMonkey handle to its platform dependent window handle (in your case a Windows handle).

Answer 3

To get handle of a panel, try this :

uses 
  FMX.Platform.Win;

var
  Handle : HWND;

begin

  Handle := TWinWindowHandle (Panel1).Wnd;

end;

Answer 4

Use Timage control, then you can assign your output to Image1.Bitmap.Handle. Its the only component that provides window Handle under FMX