Gdip_BitmapFromHWND returns blank window

[Brazolek123]

My code:
#Warn All, off
SetWorkingDir %A_ScriptDir% ; Ensures a consistent starting directory.
CoordMode, Mouse, Screen

#Include gdip.ahk ; is in the post attachment if anyone needs

If (!pToken := Gdip_Startup()){
ExitApp
}
return

f1::
WinGet, id, ID, A
return

f2::
pBitmap := Gdip_BitmapFromHWND(id)
Gdip_SaveBitmapToFile(pBitmap, "screen.bmp", 100)
Gdip_DisposeImage(pBitmap)
return

f12::
exitapp

My result:


I'm testing it on Win10 x64 and being honest I'm out of ideas. Not sure if it returns blank window because of win10, graphic card, because of the target app itself... Have you got any tips for me? What can be wrong?

Thanks in advance

[Frosti]

You want to make a screenshot from a window? You receive a hwnd to a window instead with Winget. There are much screenshot functions around in this forum. I'm not on my computer at moment, so I can't post one.

[iseahound]

Code: Select all

image := 0x187410 ; Some sort of hwnd. 

               image := WinExist(image) ? WinExist(image) : image
               if DllCall("IsIconic", "ptr",image)
                  DllCall("ShowWindow", "ptr",image, "int",4) ; Restore if minimized!
               VarSetCapacity(rc, 16)
               DllCall("GetClientRect", "ptr",image, "ptr",&rc)
               hbm := CreateDIBSection(NumGet(rc, 8, "int"), NumGet(rc, 12, "int"))
               VarSetCapacity(rc, 0)
               hdc := CreateCompatibleDC()
               obm := SelectObject(hdc, hbm)
               DllCall("PrintWindow", "ptr",image, "ptr",hdc, "uint",0x3)
               pBitmap := Gdip_CreateBitmapFromHBITMAP(hbm)
               SelectObject(hdc, obm), DeleteObject(hbm), DeleteDC(hdc)
               return pBitmap