Ruby：窗口打印屏幕win32API調用

Question

當您按下alt + printscreen（至少在Windows中）時，您會看到當前活動（和可見？）窗口的屏幕截圖。

如何使用win32Api調用調用此函數？

Answer 1

Win32::Screenshot怎麼樣？
https://github.com/jarmo/win32screenshot

gem install win32screenshot  

require 'win32/screenshot' 

# Take a screenshot of the foreground 
Win32::Screenshot::Take.of(:foreground).write("image.png") 

# Take a screenshot of the window with the specified title 
Win32::Screenshot::Take.of(:window, :title => "Abc").write("image.bmp")