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Is there a standard way to get access to the redirection surfaces?
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Free Yu
Apr 15, 2021, 10:02:57 PM4/15/21
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Hi,
I'm writing an application to stream the content of specified windows. The BitBlt works well for many applications, and even for DirectX applications.
However, when trying to get the content of Microsoft Word or PowerPoint, the magic fails and returns a black rectangle of pixels.
I wonder whether there's a standard way to get the bits of the window content for any windows.
Thanks,
--
freyu
I'm writing an application to stream the content of specified windows. The BitBlt works well for many applications, and even for DirectX applications.
However, when trying to get the content of Microsoft Word or PowerPoint, the magic fails and returns a black rectangle of pixels.
I wonder whether there's a standard way to get the bits of the window content for any windows.
Thanks,
--
freyu
Christian Astor
Apr 17, 2021, 5:54:20 AM4/17/21
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Free Yu a écrit :
> I'm writing an application to stream the content of specified windows. The BitBlt works well for many applications, and even for DirectX applications.
> However, when trying to get the content of Microsoft Word or PowerPoint, the magic fails and returns a black rectangle of pixels.
>
> I wonder whether there's a standard way to get the bits of the window content for any windows.
A way is with DwmRegisterThumbnail
(used by Explorer Thumbnails in the Taskbar)
(then D3DXSaveSurfaceToFileInMemory to get the HBITMAP)
or also recent methods :
https://blogs.windows.com/windowsdeveloper/2019/09/16/new-ways-to-do-screen-capture/
> I'm writing an application to stream the content of specified windows. The BitBlt works well for many applications, and even for DirectX applications.
> However, when trying to get the content of Microsoft Word or PowerPoint, the magic fails and returns a black rectangle of pixels.
>
> I wonder whether there's a standard way to get the bits of the window content for any windows.
(used by Explorer Thumbnails in the Taskbar)
(then D3DXSaveSurfaceToFileInMemory to get the HBITMAP)
or also recent methods :
https://blogs.windows.com/windowsdeveloper/2019/09/16/new-ways-to-do-screen-capture/
Free Yu
Apr 20, 2021, 5:53:27 AM4/20/21
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Thumbnail interface might be a low level mipmap.
Christian Astor
Apr 21, 2021, 2:02:31 PM4/21/21
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Free Yu a écrit :
> Thanks a lot. I'll give it a try. But I doubt that the content retrieved from
> Thumbnail interface might be a low level mipmap.
What do you mean by "low level bitmap" ?
It is an exact live copy of the window (if it is a video, it is animated
and you can extract a HBITMAP with D3DX)
> Thanks a lot. I'll give it a try. But I doubt that the content retrieved from
> Thumbnail interface might be a low level mipmap.
It is an exact live copy of the window (if it is a video, it is animated
and you can extract a HBITMAP with D3DX)
Jevgenijs Malcevs
Oct 29, 2022, 4:20:23 AM10/29/22
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среда, 21 апреля 2021 г. в 21:02:31 UTC+3, Christian ASTOR:
> and you can extract a HBITMAP with D3DX)
Can You please give example how to get surface from DwmRegisterThumbnail?
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