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Questions tagged [bitblt]

BitBlt WinAPI function performs a bit-block transfer of the color data corresponding to a rectangle of pixels from the specified source device context into a destination device context.

BitBlt is a Windows API function, which performs a bit-block transfer of the color data corresponding to a rectangle of pixels from the specified source device context into a destination device context.

A raster operation code is also passed to the BitBlt function, which affects how the source DC and destination DC are merged together. For example, bits can be ANDed, ORed, XORed, etc.. together for different effects.

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Saving pixels from screen HDC

Many forums give the following code regarding how to get into an array a copy of the screen's pixels: char* Pixels = NULL; HDC MemDC = CreateCompatibleDC(Context); HBITMAP Section = CreateDIBSection(Context, &Info, DIB_RGB_COLORS, (void**)&Pixels,…
sergiu reznicencu
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Does Direct3D makes calls to bitBlt from GDI32.dll

I coded a demo application which uses https://learn.microsoft.com/en-us/windows/desktop/api/d3d9/nf-d3d9-idirect3ddevice9-getfrontbufferdata to perform screen capture of the my desktop. My problem is when i use APImonitor I can see that when I…
Sabri ghazi
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Making a bitmap of a window capture support transparency

I have a function which captures an image of a specified window handle and then saves the image to a png file. I'm using gdi32. This works fine, but for a window which has transparency (example: typical fancy game launcher), the transparent areas…
Sakuya
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BitBlt drawing black squares (Windows 7)

I am creating a desktop virtualization capture driver. Basically, the driver opens a virtualized desktop and captures the screen into a bitmap buffer and sends it to the client which then gets drawn onto their screen (GetDIBits/SetDIBits). The…
user10072928
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How can i take a screenshot of the webbrowser hidden and minimized

I am trying to make a application the takes screnshots of the webbrowser hidden and minimized and put it to a picturebox or save it as a bitmap. I know that there are drawtobitmap, bitblt, copyfromscreen and some other ways, but no one do the job if…
Vadim R. Kovalev
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How can I get the image of a PictureBox generated with OpenGL?

I have associated the PictureBox to OpenGL through its handle hDC = GetDC((HWND)picBoxA->Handle.ToInt64()); This works perfectly and the graphics are drawn in the PictureBox. The problem is that I've been looking for all day for a way to get the…
user2168007
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Is it possible to BitBlt directly on to a GDI+ bitmap?

I am trying to BitBlt from an HBITMAP to a GDI+ bitmap. I tried this, but nothing happens: Bitmap Buffer = New Bitmap(608, 392) Graphics BufferGraphics = Graphics.FromImage(Buffer); IntPtr hBufferDC =…
jnm2
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Screenshot (PIL)ImageGrab.grab / BitBlt on Win10 only return the Background?

i have a big problem with windows 10, normaly i used PIL (Python) to get a nice and clean screenshot from inside a program. but with windows 10 this does not work anymore, now i become only everything on the Desktop but my FullScreen Window is…
Talirion
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can I convert bmp in-memory data into a much more smaller png in-momory data?

my program 's purpose is making a screen capture every 1/16 second , and send it by socket to remote server . current this program can work with BMP format screen capture , however , the BMP format data have too many bytes to send , it obviously…
yangl
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Delphi: capture app window in Windows10

Prior to Windows10 (and possibly W8) we could use a simple BitBlt to capture a window: function WindowSSToBmp(h: hWnd; var b: TBitmap): Boolean; Var DC: HDC; r: TRect; begin Windows.GetWindowRect(h,r); b.Width := r.Right - r.Left; …
hikari
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Writing to a memory bitmap within an memDC does not show up after bitblt, MFC dialog program

In my MFC dialog program, i want to update a bitmap in the dialog window every 2 seconds. I use a memory bitmap buffer for drawing into, and OnTimer() is called from an MFC timer every 2seconds, and calls UpdateRateGraphics() which draws to a bitmap…
Fred
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Bitblt window capture fails on MEmu (android emulator)

Try to capture the MEmu emulator's window with bitblt() (or Printwindow() - have the same issue) but can't grab the content of the window, only the background picture. Captured window: Original window: Tried with every program related window…
István Piroska
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Grab certain windows in Windows 10

I try to grab specific windows on Windows 10. I read some articles from MSDN to get familiar with APIs. My goal is to grab some certain windows, even if there are some windows on top of them (equivalent to OS X CGWindowList API). So if there are 2…
Daniel
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BitBlt function produces empty bitmap when compiled for x86 in .NET 2.0 VB app

I have a BitBlt wrapper function in my VB project. It works just fine when compiled as Any CPU, but when I aim it at x86 it creates an empty bitmap. I must use x86 as other parts of the app require it. Any ideas what could be wrong? Here is the…
Brian Sweeney
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BItBlt issue when using enhanced meta file DC as source DC

I am working on an application which is using emf for buffer drawing. I am trying to save this emf to a bitmap image file using BitBlt. But no drawings are saved to bitmap. I know I can use PlayEnhMetaFile() but I have to use BitBlt or GDI/GDI+…
Rizwan Hanif
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