Grisgram

Hi, I just wrote a little Utility in AutoIt which allows you to capture a screen region from a running application and get the PixelChecksum for that region so you can use the value later in your code to compare it. Just start the script, enter the dimensions of the area to capture and click the "Capture" Button. Then activate the window to capture and move the mouse to the point (top left corner) where you want to capture and press your hotkey. The script will then capture that area, calculate the PixelChecksum and display it in a Textbox so you can copy it to your script. The coordinates where you captured (in the client area of that window) will also be displayed. I found it quite useful to automate some browser applications when it came to detect which kind of message or image is displayed in a specific area. Here's the script, enjoy it and please let me know any enhancements you build into it or bugs you find. cheers, #include <GUIConstants.au3> #include <ScreenCapture.au3> Opt("GUIOnEventMode", 1); Change to OnEvent mode Opt("PixelCoordMode", 1); Screen coordinates Opt("MouseCoordMode", 1); Screen coordinates ; ----------------------------------------------------------------------- ; --- M A I N P R O G R A M --- I N I T I A L I Z A T I O N ; ----------------------------------------------------------------------- ; Create the main window $mainwindow = GUICreate("AutoIt CheckSummer", 640, 400) GUISetOnEvent($GUI_EVENT_CLOSE, "frm_Close") ; Create the picture box to hold the capture GUICtrlCreateLabel("Captured image:", 240, 69) $pic = GUICtrlCreateGraphic(240, 90, 256, 256) GUICtrlSetBkColor($pic, 0xffffff) GUICtrlCreateLabel("Captured image pixel checksum:", 240, 353) $checksum = GUICtrlCreateEdit("0", 400, 350, 96, 20, $ES_NUMBER) GUICtrlCreateLabel("Captured at mouse position:", 240, 370) $capturepos = GUICtrlCreateLabel(" ", 400, 370) GUICtrlCreateLabel("This tool is used to capture a portion of an image and get the PixelChecksum for it.", 10, 10) GUICtrlCreateLabel("Set the capture dimension in the textboxes then activate target window and move the mouse to the capture point.", 10, 24) GUICtrlCreateLabel("The maximum image size to be captured for checksum is 256x256 pixels.", 10, 38) GUICtrlCreateLabel("Width:", 10, 75) GUICtrlCreateLabel("Height:", 10, 99) $txtWidth = GUICtrlCreateEdit("32", 50, 72, 60, 20, $ES_NUMBER) $txtHeight = GUICtrlCreateEdit("32", 50, 96, 60, 20, $ES_NUMBER) $cmdCapture = GUICtrlCreateButton("Capture!", 35, 120, 90) GUICtrlSetOnEvent($cmdCapture, "CaptureNow") GUICtrlCreateLabel("Hotkey:", 10, 163) $txtHotkey = GUICtrlCreateEdit("c", 50, 160, 60, 20) GUICtrlCreateLabel("Press the hotkey when the mouse is", 10, 190) GUICtrlCreateLabel("positioned at the capture point.", 10, 204) GUICtrlCreateLabel("You can enter any custom hotkey here.", 10, 218) GUICtrlCreateLabel("Modifier help:", 10, 240) GUICtrlCreateLabel("^ ... Control", 10, 254) GUICtrlCreateLabel("! ... Alt", 10, 268) GUICtrlCreateLabel("+ ... Shift", 10, 282) GUICtrlCreateLabel("# ... Windows key", 10, 296) GUISwitch($mainwindow) GUISetState(@SW_SHOW) $lastimg = 0 ; Idle loop While 1 Sleep(1000) WEnd ; ----------------------------------------------------------------------- ; --- E V E N T M E T H O D S - $mainwindow ; ----------------------------------------------------------------------- Func frm_Close() If @GUI_WINHANDLE = $mainwindow Then Exit EndFunc ; ----------------------------------------------------------------------- ; --- E V E N T M E T H O D S - $cmdCapture ; ----------------------------------------------------------------------- Func CaptureNow() $wi = GUICtrlRead($txtWidth) $he = GUICtrlRead($txtHeight) if ($wi < 1 or $wi > 256 or $he < 1 or $he > 256) Then MsgBox(0, "Dimension error", "Width and Height must be between 1 and 256 (both including)!") Return EndIf HotKeySet(GUICtrlRead($txtHotkey), "CaptureKeyPressed") EndFunc Func CaptureKeyPressed() Opt("PixelCoordMode", 1); Screen coordinates Opt("MouseCoordMode", 1); Screen coordinates $mouse = MouseGetPos() $wi = GUICtrlRead($txtWidth) $he = GUICtrlRead($txtHeight) _ScreenCapture_Capture(@TempDir & "\capture.bmp", $mouse[0], $mouse[1], $mouse[0] + $wi, $mouse[1] + $he, False) ; Get the mouse pos where the capture happened (in the client area of the active form) Opt("PixelCoordMode", 2); Client area of active window Opt("MouseCoordMode", 2); Client area of active window $winmouse = MouseGetPos() ;Beep(1000, 50) Sleep(1000) WinActivate("AutoIt CheckSummer") WinWaitActive("AutoIt CheckSummer") GUICtrlSetData($capturepos, $winmouse[0] & " . " & $winmouse[1]) if $lastimg <> 0 Then GUICtrlDelete($lastimg) $lastimg = GUICtrlCreatePic(@TempDir & "\capture.bmp", 240, 90, $wi, $he) GUICtrlSetData($checksum, PixelChecksum(240, 90, 240 + $wi - 1, 90 + $he - 1, 1)) EndFunc

I'm using Visual C# 2005 and what I tried to do is a simple program that captures a screen region for me, paste it into a PictureBox control and then calculate the checksum for me. The capture part is working fine, the picture is displayed, and then this method is called: (The image is always painted at 0,0 which is the top left corner of the picture box) AutoItX3Class ai = new AutoItX3Class(); private void GetCheckSum() { if (pic.Image != null) { pic.Refresh(); lblChecksum.Text = ai.PixelChecksum(pic.Left, pic.Top, pic.Image.Width - 1, pic.Image.Height - 1 , 1).ToString(); } else lblChecksum.Text = "0"; } So, what happens? As long as the captured image is 3x3 pixels or smaller everything works fine, but as soon as I capture a larger area (for my current project I need to capture 48x16 pixels, which is one specific line of text in a graphical application), the return value is always -2.17 billion. On the other side, the same "code" (= the same way of capturing) in a pure AutoIt-GUI-Application works fine and I get correct checksums. Thanks for any more help on this.

Hi, we experimented today a little with the PixelChecksum wrapper in the AutoItX com control and we found that the return value for a region greater than about 10 pixels always returns -2.17 billion which looks like an integer overflow. should the return value be a long? in any .au3 script it works fine, but not with the dll (the same calls, the same region and the same amount of pixels scanned). Did anyone else experience this problem or is there any solution around? I used the search function but didn't find any topic on that behavior. thanks for any help grisgram

Not yet, no. Thanks for this hint... /away to try it out... thx

if i use the window title of the mdi CHILD i get an error and no array is returned from the function. If I use the title of the MDI Frame i get (of course) the coordinates of the main window. This approach doesn't work or I missed something fundamental. Seems like I have no way to access the inner form of a MDI. Can you explain that a little closer please or do you have any other ideas? thx, mike

Hi, I have a MDI Application running which opens several child windows. I want to access a specified pixel in one of those childs. How can I do that? ActiveWindow is always the MDI-Frame. I can't tell, where it is located on the screen, so absolute coordinates do not work. I need relative. The window spy shows me the title of the active child window somewhere in its list of the "visible window text" area... How can I access one specific child window in an MDI frame? I need the coordinates (inside the MDI frame) of this window to go ahead from there and find the pixel I am so desperately looking for Any help appreciated! thanks, Mike

yes yes you are sooo right seems like i have my confuse day today. of course i take the value 0... thank you! gris

I think I can answer my stupid noob question by myself - sorry for bothering you there's the mousemove command - I will try speed setting to 100. Sorry again. Cheers, mike

Hi, I am fairly new to AutoIt and just wrote some small scripts to get a feeling for the "how-to's". What I find strange is the command MouseClick. If i use it, AutoIt simulates (a dang slow) movement of the mouse across the screen until it reaches the specified coordinates. On my (graphical) business machine with a resolution of > 2000 pixels horizontal and about 1400 pixels vertical it often takes 4-5 seconds for the mouse to arrive on the coordinates specified. this is MUCH too slow. Is there an option I missed or some other trick where i just "SET" the mouseposition to a specified coordinate without having to wait eons for the mouse to "move" there... ? There's a MouseGetPos command, but unfortunately no MouseSetPos. I know there exist WM_ messages in Windows that allow the direct setting of a position. Any way to do this? Because this slow movement makes it almost impossible (and very ineffective) for me to use this about perfect script language. Thanks for any help on this! Cheers, Mike