Screenshot of UI (Window-Class)

TinyCLR OS
1

Is there a way to take a screenshot of the current UI (4.3" 480x272).

My attempt:

 var Screen = Graphics.FromHdc(Display.DisplayController.Hdc);
 byte[] bmp = Screen.GetBitmap(0, 0, 480, 272);
 var bm = new Bitmap(bmp, 480, 272);

 using (var FileHandle = new FileStream(fi.FullName, FileMode.Create))
       {
           bm.Save(FileHandle, System.Drawing.Imaging.ImageFormat.Bmp);
etc.

produces only a black bitmap

3

You need to call this somewhere before start UI, probably in main().

Graphics.OnFlushEvent += Graphics_OnFlushEvent;

Then every time UI flush to screen , it will trigger function Graphics_OnFlushEvent, then you take data, convert to bitmap and save to bmp format.

Example below:


private static void Graphics_OnFlushEvent(Graphics sender, byte[] data, int x, int y, int width, int height, int originalWidth)
        {
            Debug.WriteLine("count flush " + count++);

            var bmpBitmap = new Bitmap(data, width, height);

            var sdController = StorageController.FromName(SC20260.StorageController.SdCard);

            var provider = FileSystem.Mount(sdController.Hdc);

            
            var stream = new FileStream(@"A:\UICapture.bmp", FileMode.CreateNew);

            bmpBitmap.Save(stream, System.Drawing.Imaging.ImageFormat.Bmp);

            stream.Close();
            FileSystem.Flush(sdController.Hdc);
            FileSystem.Unmount(sdController.Hdc);

        }
1 Like
4

:grinning: Works great :+1:

1 Like
5

Thank for feedback.

The code above just for paste and run, easy for user.

When implement to project, should not call Mount/Unmount every time UI flush, it will slow down system a lot.