Import HBitmap directly?

[Christian Berg]

Hi!

I am capture the screen and trying to present the captured image in a D2DImage. Everything works fine, but the question is if it can be more efficient.

Right now I am getting a hBitmap from the Cope screen function, which I convert into a GDI which I send to D2D image which converts it back to an hbitmap?

Do you think there could be an option to feed the hbitmap directly?

success = BitBlt(memoryDc, 0, 0, region.Width, region.Height, desktopDc, region.Left, region.Top, RasterOperations.SRCCOPY Or RasterOperations.CAPTUREBLT)

    D2Dimage.Dispose()
    D2Dimage = Nothing
    D2Dimage = device.CreateBitmapFromGDIBitmap(image.FromHbitmap(bitmap))

Best
Christian

Dim desktophWnd As IntPtr
Dim desktopDc As IntPtr
Dim memoryDc As IntPtr
Dim bitmap As IntPtr
Dim oldBitmap As IntPtr
Dim success As Boolean
'Dim result As Bitmap
desktophWnd = GetDesktopWindow()
desktopDc = GetWindowDC(desktophWnd)
memoryDc = CreateCompatibleDC(desktopDc)
bitmap = CreateCompatibleBitmap(desktopDc, region.Width, region.Height)
oldBitmap = SelectObject(memoryDc, bitmap)

    success = BitBlt(memoryDc, 0, 0, region.Width, region.Height, desktopDc, region.Left, region.Top, RasterOperations.SRCCOPY Or RasterOperations.CAPTUREBLT)


    D2Dimage.Dispose()
    D2Dimage = Nothing
    D2Dimage = device.CreateBitmapFromGDIBitmap(image.FromHbitmap(bitmap))


    SelectObject(memoryDc, oldBitmap)
    DeleteObject(bitmap)
    DeleteDC(memoryDc)
    ReleaseDC(desktophWnd, desktopDc)

[Jingwood]

I have added a new API method CreateBitmapFromHBitmap, you can try this method from the latest source code.

D2Dimage = device.CreateBitmapFromHBitmap(hbitmap)

2b4f395

By the way, if you capture the entire screen, you may consider to use this method, which doesn't need to use hbitmap. I am not sure if it brings better performance.
https://stackoverflow.com/questions/5049122/capture-the-screen-shot-using-net

[Christian Berg]

Thanks!
Way much faster and more importantly less memory usage. An awesome library just got better!

Christian

[Christian Berg]

And.. Thanks for the link. I wanted to capture a region of the screen. Trying to capture a window but having issues with application which are hardware rendered so right now the best effort is to capture a part of a screen but I really would like to capture a window and the content of it rather than the screen.

[Jingwood]

Glad to hear that works.