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KryTonX

GetPixel - Pixel Color of background Window

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Hello there,

as I used this function in a lot of projects, I might as well share it :)

It gets a color value from a background (or foreground of course) window by using a combination of WinAPI.au3 and GDIPlus.au3 (might as well be replaced with https://msdn.microsoft.com/en-us/library/windows/desktop/dd144909(v=vs.85).aspx which should work too and is maybe a bit faster, as it wouldn't need to create an extra GDIPlus Bitmap).

 

Long story short; here is the function:

 

;===================================================================================================================================
;
; Description:      Gets the Color Value from a Pixel (possible in background windows [not hidden!])
; Syntax:           GetColor()
; Parameter(s):
;                   $iX - X Coordinate (In the Window, not whole Screen), get it by using the Autoit Window Info tool!
;                   $iY - Y Coordinate (In the Window, not whole Screen), get it by using the Autoit Window Info tool!
;                   $WinHandle - Handle obtained by WinGetHandle
;                   $iWidth - Width of the Window to Capture
;                   $iHeight - Height of the Window to Capture
;
; Return Value(s):  Hex of Color Value
;
; Requirements: 
; #RequireAdmin Braucht Adminrechte falls ihr auf ein Programm mit Adminrechten zugreifen wollt!
;#include <WinAPI.au3>
;#include <WindowsConstants.au3>
;#include <GDIPlus.au3>
;#include <ScreenCapture.au3>
; #include <Array.au3>
;
; Note: Does NOT work on hidden or minimized windows as Windows stops rendering them.
;       If you do not want to put in the $WinHandle all the time, replace the $WinHandle Parameter
;       with $WinHandle = $hwnd (if $hwnd is your Handle obtained by WinGetHandle)
;
;       Tested only on Windows 10 Professional 64 Bit
;
;===================================================================================================================================

Func GetColor($iX,$iY,$WinHandle)

    _GDIPlus_Startup()

    Local $aPos = WinGetPos($WinHandle)
    $iWidth = $aPos[2]
    $iHeight = $aPos[3]
    Local $hDDC = _WinAPI_GetDC($WinHandle)
    Local $hCDC = _WinAPI_CreateCompatibleDC($hDDC)

    $hBMP = _WinAPI_CreateCompatibleBitmap($hDDC, $iWidth, $iHeight)


    _WinAPI_SelectObject($hCDC, $hBMP)
    DllCall("User32.dll", "int", "PrintWindow", "hwnd", $WinHandle, "hwnd", $hCDC, "int", 0)
    _WinAPI_BitBlt($hCDC, 0, 0, $iWidth, $iHeight, $hDDC, 0, 0, $__SCREENCAPTURECONSTANT_SRCCOPY)


     $BMP = _GDIPlus_BitmapCreateFromHBITMAP($hBMP)
     Local $aPixelColor = _GDIPlus_BitmapGetPixel($BMP, $iX, $iY)

    _WinAPI_ReleaseDC($WinHandle, $hDDC)
    _WinAPI_DeleteDC($hCDC)
    _WinAPI_DeleteObject($hBMP)
   _GDIPlus_ImageDispose($BMP)
    _GDIPlus_Shutdown()

    Return Hex($aPixelColor, 6)
EndFunc   ;==>GetColor


And when we are at it, here is a little program to get the right color values for your program, just press Shift + X after configuration it, by putting in the right Program Title and you will get the coordinates and the color value of your mouse position inside of the program you wanted ^^

 

; #RequireAdmin Braucht Adminrechte falls ihr auf ein Programm mit Adminrechten zugreifen wollt!
#include <WinAPI.au3>
#include <WindowsConstants.au3>
#include <GDIPlus.au3>
#include <ScreenCapture.au3>
#include <Array.au3>


HotKeySet("{ESC}","_exit")
HotKeySet("X","Go")
Global $x
Global $y
Global $hBMP
;~ MsgBox(0,"","OK!")
$Title = "PUT THE TITLE OF YOUR WINDOW HERE!"
$hwnd = WinGetHandle($Title)
MsgBox (0,"",$hwnd)

While 1
Sleep (100)
WEnd

Func Go()
Local $MousePos = _WinAPI_GetMousePos(True, $hWnd)
$x = DllStructGetData($MousePos, "X")
$y = DllStructGetData($MousePos, "Y")
;~ $x = if you want to set them manual
;~ $y = use this and comment out both DLLStructGetData
$Color = GetColor($x, $y, $hwnd)
MsgBox(0,"","x: " &$x& " y: " &$y& " Color: " &$Color)
EndFunc

Func _Exit()
   Exit
EndFunc

Func GetColor($iX,$iY,$WinHandle)

    _GDIPlus_Startup()

    Local $aPos = WinGetPos($WinHandle)
    $iWidth = $aPos[2]
    $iHeight = $aPos[3]
    Local $hDDC = _WinAPI_GetDC($WinHandle)
    Local $hCDC = _WinAPI_CreateCompatibleDC($hDDC)

    $hBMP = _WinAPI_CreateCompatibleBitmap($hDDC, $iWidth, $iHeight)


    _WinAPI_SelectObject($hCDC, $hBMP)
    DllCall("User32.dll", "int", "PrintWindow", "hwnd", $WinHandle, "hwnd", $hCDC, "int", 0)
    _WinAPI_BitBlt($hCDC, 0, 0, $iWidth, $iHeight, $hDDC, 0, 0, $__SCREENCAPTURECONSTANT_SRCCOPY)


     $BMP = _GDIPlus_BitmapCreateFromHBITMAP($hBMP)
     Local $aPixelColor = _GDIPlus_BitmapGetPixel($BMP, $iX, $iY)

    _WinAPI_ReleaseDC($WinHandle, $hDDC)
    _WinAPI_DeleteDC($hCDC)
    _WinAPI_DeleteObject($hBMP)
   _GDIPlus_ImageDispose($BMP)
    _GDIPlus_Shutdown()

    Return Hex($aPixelColor, 6)
EndFunc   ;==>GetColor




I hope  I was able to help somebody on the long run :)
If you have any improvements or found any mistake, please let me know and I will try to improve the function as soon as possible.

Also please excuse my "not so clean" coding, I am still learning ;)


Have fun,
KryTonX
 

EDIT: Thanks at JohnOne for his improvements on the Script, I have added WinGetPos...I wonder why I never got that Idea :D

Edited by KryTonX

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Appears to do what it says on the tin.

;#RequireAdmin
#include <WinAPI.au3>
#include <WindowsConstants.au3>
#include <GDIPlus.au3>
#include <ScreenCapture.au3>
#include <Array.au3>

$scite = WinGetHandle("[ACTIVE]")
$gui = GUICreate("gui", 1000, 500)
GUISetBkColor(0x112233)
GUISetState()
WinActivate($scite)
Sleep(500)
$hwnd = WinGetHandle("gui")
MsgBox(0, 0, GetColor(100, 100, $hwnd))


Func GetColor($iX, $iY, $WinHandle)

    Local $aPos = WinGetPos($WinHandle)
    $iWidth = $aPos[2]
    $iHeight = $aPos[3]

    _GDIPlus_Startup()

    Local $hDDC = _WinAPI_GetDC($WinHandle)
    Local $hCDC = _WinAPI_CreateCompatibleDC($hDDC)

    $hBMP = _WinAPI_CreateCompatibleBitmap($hDDC, $iWidth, $iHeight)

    _WinAPI_SelectObject($hCDC, $hBMP)
    DllCall("User32.dll", "int", "PrintWindow", "hwnd", $WinHandle, "hwnd", $hCDC, "int", 0)
    _WinAPI_BitBlt($hCDC, 0, 0, $iWidth, $iHeight, $hDDC, 0, 0, $__SCREENCAPTURECONSTANT_SRCCOPY)

    $BMP = _GDIPlus_BitmapCreateFromHBITMAP($hBMP)
    Local $aPixelColor = _GDIPlus_BitmapGetPixel($BMP, $iX, $iY)

    _WinAPI_ReleaseDC($WinHandle, $hDDC)
    _WinAPI_DeleteDC($hCDC)
    _WinAPI_DeleteObject($hBMP)
    _GDIPlus_ImageDispose($BMP)

    Return Hex($aPixelColor, 6)
EndFunc   ;==>GetColor

Note: altered func params and does not require admin.

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Thanks for your little improvement :)

I have added the change.

For me, somehow, it still doesn't give back the right ColorValue without Admin rights -_- I will let it in for now, if some people can confirm that it works without I will put it out!

 

Thanks for your help :)

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Perhaps the window you are looking at is admin window, and that requires admin rights.

Anyway, might be prudent to shut down _GDIPlus_Startup().

Added :)

You are probably right with the Admin rights,

Fixed it in the code!

Edited by KryTonX

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