Allow for capturing obscured windows
General information:
- OS name: Windows
- OS version: 10
- OS architecture: 64 bits
- Resolutions:
- Monitor 1: 1920x1080
- Monitor 2: 1920x1080
- Python version: 3.8.3
- MSS version: 6.0.0
Description of the warning/error
This is not related to an error message. This has to do with capturing obscured windows.
Other details
In order to capture an obscured window, a library I have been using in AHK which also uses dll capture has figured out how to do it. I understand that this is not written in python or c, but this code may be an assistance in understanding the steps he has done in order to utilize the GetDCEx call.
Essentially he does what seems to be two captures, which is not ideal, but it works. I was hoping that it would be possible to collaborate on implementing this feature into your library, or if you would rather use this code as a starting point:
Bind Window function to set and remember the window
Some of the code here is not really necessary. Mostly it is just having a static value saved in the class which can be assigned to a window handle. When performing further screenshots, this handle will be used the get the DC instead of the screen.
BindWindow(window_id:=0, set_exstyle:=0, get:=0)
{
static id, old, Ptr:=A_PtrSize ? "UPtr" : "UInt"
if (get)
return, id
if (window_id)
{
id:=window_id, old:=0
if (set_exstyle)
{
WinGet, old, ExStyle, ahk_id %id%
WinSet, Transparent, 255, ahk_id %id%
Loop, 30
{
Sleep, 100
WinGet, i, Transparent, ahk_id %id%
}
Until (i=255)
}
}
else
{
if (old)
WinSet, ExStyle, %old%, ahk_id %id%
id:=old:=0
}
}Capturing the screenshot, determining if a window handle is present and using that instead
if (hBM) and !(w<1 or h<1)
{
win:=DllCall("GetDesktopWindow", Ptr)
hDC:=DllCall("GetWindowDC", Ptr,win, Ptr)
mDC:=DllCall("CreateCompatibleDC", Ptr,hDC, Ptr)
oBM:=DllCall("SelectObject", Ptr,mDC, Ptr,hBM, Ptr)
DllCall("BitBlt",Ptr,mDC,"int",x-zx,"int",y-zy,"int",w,"int",h
, Ptr,hDC, "int",x, "int",y, "uint",0x00CC0020) ; |0x40000000)
DllCall("ReleaseDC", Ptr,win, Ptr,hDC)
if (id:=BindWindow(0,0,1))
WinGet, id, ID, ahk_id %id%
if (id)
{
WinGetPos, wx, wy, ww, wh, ahk_id %id%
left:=x, right:=x+w-1, up:=y, down:=y+h-1
left:=left<wx ? wx:left, right:=right>wx+ww-1 ? wx+ww-1:right
up:=up<wy ? wy:up, down:=down>wy+wh-1 ? wy+wh-1:down
x:=left, y:=up, w:=right-left+1, h:=down-up+1
}
if (id) and !(w<1 or h<1)
{
hDC2:=DllCall("GetDCEx", Ptr,id, Ptr,0, "int",3, Ptr)
DllCall("BitBlt",Ptr,mDC,"int",x-zx,"int",y-zy,"int",w,"int",h
, Ptr,hDC2, "int",x-wx, "int",y-wy, "uint",0x00CC0020) ; |0x40000000)
DllCall("ReleaseDC", Ptr,id, Ptr,hDC2)
}
DllCall("SelectObject", Ptr,mDC, Ptr,oBM)
DllCall("DeleteDC", Ptr,mDC)
}
How does funding with Polar work?
Pay now to fund the work behind this issue.
Get updates on progress being made.
Maintainer is rewarded once the issue is completed.
Backer
You're funding impactful open source efforts
Contributor
You want to contribute to this effort
Maintainer
You want to get funding like this too