Pixelgetcolor() problem

[MrTam]

I use pixelgetcolor() on an inactive window. It was return incorrect result.

Simple code

#include <NomadMemory.au3>
#include <GUIConstantsEx.au3>
#include <StaticConstants.au3>

$title="Corel" ; window title
global $img[150][150]
Opt("PixelCoordMode", 0)
If WinExists($title) Then
    $handle=WinGetHandle($title)
    ;WinActivate($title) 
    For $i=0 to 99
        For $j=0 to 99
            $img[$i][$j]=PixelGetColor($i,$j,$handle)
        Next
    Next
    ;draw picture
    GUICreate("Test",400,300,-1,-1)
    $graphic=GUICtrlCreateGraphic(50,50,200,200)
    GUICtrlSetBkColor($graphic, 0xffffff)
    for $i=0 to 99
        for $j=0 to 99
            GUICtrlSetGraphic($graphic, $GUI_GR_COLOR, "0x"&Hex($img[$i][$j],6))
            GUICtrlSetGraphic($graphic,$GUI_GR_PIXEL,$i,$j)
        Next
    Next
    GUISetState(@SW_SHOW)
    
    While 1
        $msg = GUIGetMsg()
        If $msg = $GUI_EVENT_CLOSE Then Exit
    WEnd    
Else
        MsgBox(64,"Alert","Window not exist!")
        exit
Endif

If I add WinActivate($title) line, every OK. Else, it was return result on active window (wrong!)

I use AutoIt lastest version.

P.S.: Sorry for may bad English!

[JohnOne]

If the window you are trying to retrieve the color from is not visible on screen, pixelgetcolor() will not work.

[MrTam]

Thanks for reply!

pixelgetcolor() function has hwnd parameter. It's not useful?

[JohnOne]

It is useful only if the window is visible Im afraid.