How take screenshot of scrolling window in C#

Question

What is the easiest way in C# to take a screenshot of a complete scrolling Window?

I have sceen examples on here using a web browser, but in this case the window is a Windows desktop application.

Answer 1

You can get windows to redirect a WM_PAINT to an offscreen buffer with WM_PRINT and WM_PRINTCLIENT. This is better than screenscraping because it makes sure that obscured parts of a window(behind other windows) is painted anyway. If your target window scrolls by scrolling a child window position, WM_PRINT should apply. Just maybe it also helps your scenario.

Answer 2

Just 3 lines of code is enough

Bitmap b = new Bitmap(pnlOuter.Width, pnlOuter.Height);
pnlOuter.DrawToBitmap(b, new Rectangle(0, 0, pnlOuter.Width, pnlOuter.Height));
b.Save("D:\\bitmapImage.jpg");

pnlOuter is a panel that contains all the controls to be shown in image with extended height to contain all the inner controls. The containing form may have scroll bars enabled.

Answer 3

我通过使用Win API并拍摄了多个屏幕截图，在每个屏幕截图之间滚动然后将它们连接在一起来解决了这个问题。