CaptureWnd offscreen

[Terenz]

CaptureWnd of ScreenCapture UDF can't capture offscreen and i don't care. But i don't like the result of the output image, example with this script:

#include <ScreenCapture.au3>

Run("notepad.exe")
$hNot = WinWait("[CLASS:Notepad]")
WinMove($hNot, "", -180, 0, 300, 300) ; just for test of a window in offscreen position!
_ScreenCapture_CaptureWnd("Test.jpg", $hNot)
WinClose($hNot)

This is the image:

With all that black background, instead i prefer something like this ( edited image )

The UDF use _WinAPI_GetDesktopWindow and _WinAPI_GetDC so probabily but i don't know how to do is possible to use region ( CreateRectRgn \ SetWindowRgn? ) to subtract the "un-visible" area for get the result like the second image. Please show me how to do, thanks

Or are welcome any suggestion

Edited December 3, 2015 by Terenz

[UEZ]

#include <ScreenCapture.au3>

Run("notepad.exe")
$hNot = WinWait("[CLASS:Notepad]")
WinMove($hNot, "", -180, 0, 300, 300)
Sleep(500)
_ScreenCapture_Capture("Test.jpg", 0, 0, -180 + 300, 300)
WinClose($hNot)

 

[Terenz]

UEZ,

Thanks for the answer but don't take the example too serious

I'll clarify, the question is:

CaptureWnd for offscreen window add that ugly black background. Instead i want to have in the saved image only the visible part of the window. I have think to use region but that was just an idea. The expected result is the second image on the first post. Thanks again

[UEZ]

That's what the code is doing. It captures only the visible part of the window.

[Terenz]

Yes but with that code i can cover if the window is moved on the left, but if is offscreen on top-left, top-right, bottom, bottom-left, bottom-right and so on there are many situation. Regions wasn't a good idea? 

[UEZ]

You can check for the coordinate of the window and check afterwards which part is off the screen. That shouldn't be a big deal.

[johnmcloud]

Make a copy of CaptureWnd function and add a couple of new variable for check SM_CXSCREEN - $SM_CYSCREEN using _WinAPI_GetSystemMetrics. Than compare the original variable of the Window with that and if is > than use the value reported from GetSystemMetrics. In this case you have always a good image

I don't know if it work in a multi monitor configuration, i don't have one. Maybe UEZ know.

[UEZ]

I've one in my office (3 screens). If I find a slot I will code a function.