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Questions tagged [dwm]

For questions about the Desktop Window Manager (DWM), which handles desktop composition in Windows Vista and later versions. For questions about the Dynamic Window Manager (DWM) for X, use [x-dwm].

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Add image to window title bar

I want to add an image to the window's title bar. I know that is not possible with native Winforms tools but it should be able with the WinApi calls. [DllImport("user32.dll", SetLastError = true)] private static extern IntPtr…
DerApe
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Why is it my application which contains DWM thumbnail lags when the target app was moved to second monitor?

Scenario: I have a wpf fullscreen borderless application that displays a live thumbnail of a borderless, fullscreen UWP app that plays video. My laptop setup includes 1 extended monitor thru HDMI port. My wpf app can display a live thumbnail of the…
Keinth Mac
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Screenshot of the specific window (HWND, HW accelerated)

I need to capture a snapshots/screenshots of the specific window (HWND) that is using HW acceleration and record them to a video stream. While using BitBlt or PrintWindow I'm able to capture image data only if this window is not HW accelerated, else…
Gediminas
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DwmSetWindowAttribute does not work with DWMWA_CLOAK

I recently started using lower level windows APIsn with C# for an application prototype and I stumble upon a problem that I cannot get my way around: Consider the following piece of code: public class dW { [DllImport("dwmapi.dll")] public…
Kyle Oliveira
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How easy is it in DWM to make an 'always on top' thumbnail for an existing window

I really like when you hover over a window in Vista on the taskbar and it gives you a little preview. if it is video it even plays in the thumbnail. Often I really wish I could 'tear off' this little window and keep it as an 'always on top'…
Simon_Weaver
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Programmatically (first-time!) enable aero theme/desktop composition

I want to enable desktop composition on a Windows 7 machine programmatically (preferrable C#) and already tried to do it with the infamous DwmEnableComposition P/Invoke. However, this does not seem to work if DWM has never been enabled (and the…
Christoph
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Screen capturing based on Windows Magnification API fails on Windows 7 64 bit With Aero theme disabled

I'm trying to capture the desktop screen using Windows Magnification APIs based on code sample given in https://www.codeproject.com/Articles/607288/Screenshot-using-the-Magnification-library?msg=5570528#xx5570528xx. The program (32bit executable)…
iamrameshkumar
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DwmGetWindowAttribute doesn't get the correct Rect size for MediaPlayer if it's in full screen mode

I am trying to get application size using this code : [DllImport(@"dwmapi.dll")] private static extern int DwmGetWindowAttribute(IntPtr hwnd, int dwAttribute, out Rect pvAttribute, int cbAttribute); [Serializable,…
Ebram
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How does DwmQueryThumbnailSourceSize determine window size?

I wrote an Alt-Tab replacement application. I use DwmQueryThumbnailSourceSize to determine window sizes, and construct my layout. However this function is available only after I have already constructed the Dwm thumbnails. If I knew the window sizes…
Frigo
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How to enable windows docking with frameless electron window

So electron has a feature where you can make a BrowserWindow frameless with 'frame' option set to false. From version 1.4.14 and onwards, docking (with windows key + left/right) or dragging the window (and maximizing) does not work anymore. I can't…
Perfection
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Detect show/hide Task View (Win+Tab)

I'm developing a Application Desktop Toolbar (next Toolbar). Toolbar receives ABN_FULLSCREENAPP notification when a fullscreen application window is opened or closed (e.g. through F11). A window is fullscreen when its client area occupies the entire…
Asaq
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How do I mimic the windows 7 UI?

I want to try and get the same look as Windows 7, with the aero glass dropping down just a little bit so that there can be a back button/address bar/ search box. Are there any tutorials on how to do this? I really need something simple, as I tried…
Sean
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Windows 10 Desktop Window Manager swap timing?

I have a few questions regarding the Desktop Window Manager (aka DWM) in Windows 10: Background: For an OpenGL application I wrote in C++ I need precise timing regarding the swap of the front and back buffers in OpenGL and the realization of these…
VoodooCode
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Windows Vista/7 glass completely broken?

I'm trying to get the media player glass effect for an application, but I'm facing roadblocks all around. Is it me, or is it the API? I started by calling: MARGINS margins = { -1, -1, -1, -1 }; HRESULT result = ::DwmExtendFrameIntoClientArea(m_hWnd,…
Coder
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How to capture DWM window buffers for virtual reality app

I want to be able to build something similar to the now defunct vr program Envelop. It allows you to interact with your Windows 10 windows in a VR space https://www.youtube.com/watch?v=XPCq089MQDI From reading on wikipedia i see that windows write…
Mr Bell
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