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timmy2

What's wrong with my understanding of this code?

By timmy2, in AutoIt General Help and Support

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timmy2    9

timmy2
Posted

I found >this thread started by chuber while searching for a way to get the useable desktop area (size of primary monitor desktop minus taskbar).

My first bit of bafflement was why the code written by chuber does not match the quote of his code in the reply that follows his post.

Since I didn't want to tackle figuring out Sysinternal's debug viewer I went with the version of his code that omits all the lines starting with "If $DEBUG_001...". (more is omitted than that but I think it's missing only comments)  I'll paste this version below. It compiles fine.

What chuber posted is a function. So my first goal is to write a simple MsgBox that will show me the results of his function.

When I insert a simple MsgBox to see the results of his function...

MsgBox(0,"test",$aDesktop_Pos[0])

...I get an error saying "Subscript used with non-Array variable.", yet he used $aDesktop_Pos as an array variable throughout his function and it's a global variable. What part of this do I not understand and how can I extract the info I'm seeking?

Here's the code from the original thread.

;
#cs
    Script:        Desktop client size and Taskbar position (code snippet)
    Author:        Bruce Huber (cbruce)
    AutoIt:        v3.2.12.1
    Date:        2008.08.13 - Original release

    Purpose:
        Determine whether the Taskbar is visible or hidden and where it is docked on the Desktop.
        Also calculate the available Desktop client region, accounting for any Taskbar space.
#ce

;    Desktop and Taskbar position information - GetDesktopAndTaskbarPos().
Global Enum $DTP_X, $DTP_Y, $DTP_W, $DTP_H
Global $aDesktop_Pos, $aTaskbar_Pos
Global Enum $TBDL_UNKNOWN, $TBDL_LEFT, $TBDL_RIGHT, $TBDL_TOP, $TBDL_BOTTOM
Global $Taskbar_Dock_Location = $TBDL_UNKNOWN
Global $Taskbar_Visible
  

Func GetDesktopAndTaskbarPos()
    ;    Get the Desktop size - which includes the Taskbar space, if the Taskbar is visible.
    $aDesktop_Pos = WinGetPos( "Program Manager")
    ;    Get the Taskbar size.
    $aTaskbar_Pos = WinGetPos( "[Class:Shell_TrayWnd]")
    ;    Determine if Taskbar is taking up space on the Desktop.
    If ( $aTaskbar_Pos[$DTP_X] > -3) And ( $aTaskbar_Pos[$DTP_Y] > -3) And ( $aTaskbar_Pos[$DTP_X] < ( $aDesktop_Pos[$DTP_W] - 5)) And ( $aTaskbar_Pos[$DTP_Y] < ( $aDesktop_Pos[$DTP_H] - 5)) Then
        ;    Taskbar is Visible.
        $Taskbar_Visible = True
        ;    Calculate the parameters of the AVAILABLE Desktop client region.
        If ( $aTaskbar_Pos[$DTP_X] < 1) and ( $aTaskbar_Pos[$DTP_Y] > 0) and ( $aTaskbar_Pos[$DTP_W] > $aTaskbar_Pos[$DTP_H]) Then
            ;    Taskbar is on the BOTTOM.
            $Taskbar_Dock_Location = $TBDL_BOTTOM
            ;    We need to adjust the Desktop Height.
            $aDesktop_Pos[$DTP_H] = $aTaskbar_Pos[$DTP_Y] - 1
        ElseIf ( $aTaskbar_Pos[$DTP_X] < 1) and ( $aTaskbar_Pos[$DTP_Y] < 1) and ( $aTaskbar_Pos[$DTP_W] < $aTaskbar_Pos[$DTP_H]) Then
            ;    Taskbar is on the LEFT.
            $Taskbar_Dock_Location = $TBDL_LEFT
            ;    We need to adjust the Desktop X and Width.
            $aDesktop_Pos[$DTP_X] = $aTaskbar_Pos[$DTP_X] + $aTaskbar_Pos[$DTP_W] + 1
            $aDesktop_Pos[$DTP_W] = $aTaskbar_Pos[$DTP_X] - 1
        ElseIf ( $aTaskbar_Pos[$DTP_X] > 0) and ( $aTaskbar_Pos[$DTP_Y] < 1) and ( $aTaskbar_Pos[$DTP_W] < $aTaskbar_Pos[$DTP_H]) Then
            ;    Taskbar is on the RIGHT.
            $Taskbar_Dock_Location = $TBDL_RIGHT
            ;    We need to adjust the Desktop Width.
            $aDesktop_Pos[$DTP_W] = $aTaskbar_Pos[$DTP_X] - 1
        ElseIf ( $aTaskbar_Pos[$DTP_X] < 1) and ( $aTaskbar_Pos[$DTP_Y] < 1) and ( $aTaskbar_Pos[$DTP_W] > $aTaskbar_Pos[$DTP_H]) Then
            ;    Taskbar is on the TOP.
            $Taskbar_Dock_Location = $TBDL_TOP
            ;    We need to adjust the Desktop Y and Height.
            $aDesktop_Pos[$DTP_Y] = $aTaskbar_Pos[$DTP_Y] + $aTaskbar_Pos[$DTP_H] + 1
            $aDesktop_Pos[$DTP_H] = $aTaskbar_Pos[$DTP_Y] - 1
        Else
            ;    Where the heck has the Taskbar gone?
            $Taskbar_Dock_Location = $TBDL_UNKNOWN
        EndIf
    Else
        ;    Taskbar is Hidden.
        $Taskbar_Visible = False
    EndIf
    #cs
            $aDesktop_Pos now contains parameters that only define the AVAILABLE Desktop client region.  This will
        be the entire Desktop if the Taskbar is hidden.  Otherwise, the region will be the Desktop area minus the
        Taskbar area.

            $Taskbar_Dock_Location now specifies WHERE, on the Desktop, that the Taskbar is docked.
    #ce
EndFunc   ; GetDesktopAndTaskbarPos()
;

I realize there's> a post in another thread that uses a different approach to finding the data I seek but all I need are "x,y,h,w" and I can't figure out how to extact that info from the script provided in that code (copy pasted below).  This is humbling.

Global Const $MONITOR_DEFAULTTONULL     = 0x00000000
Global Const $MONITOR_DEFAULTTOPRIMARY  = 0x00000001
Global Const $MONITOR_DEFAULTTONEAREST  = 0x00000002

Global Const $CCHDEVICENAME             = 32
Global Const $MONITORINFOF_PRIMARY      = 0x00000001


$hMonitor = GetMonitorFromPoint(0, 0)
;$hMonitor = GetMonitorFromPoint(-2, 0)
;$hMonitor = GetMonitorFromPoint(@DesktopWidth, 0)

If $hMonitor <> 0 Then
    Dim $arMonitorInfos[4]
    If GetMonitorInfos($hMonitor, $arMonitorInfos) Then _
        Msgbox(0, "Monitor-Infos", "Rect-Monitor" & @Tab & ": " & $arMonitorInfos[0] & @LF & _
                            "Rect-Workarea" & @Tab & ": " & $arMonitorInfos[1] & @LF & _
                            "PrimaryMonitor?" & @Tab & ": " & $arMonitorInfos[2] & @LF & _
                            "Devicename" & @Tab & ": " & $arMonitorInfos[3])
EndIf

Exit

Func GetMonitorFromPoint($x, $y)
    $hMonitor = DllCall("user32.dll", "hwnd", "MonitorFromPoint", _
                                            "int", $x, _
                                            "int", $y, _
                                            "int", $MONITOR_DEFAULTTONULL)
    Return $hMonitor[0]
EndFunc


Func GetMonitorInfos($hMonitor, ByRef $arMonitorInfos)
    Local $stMONITORINFOEX = DllStructCreate("dword;int[4];int[4];dword;char[" & $CCHDEVICENAME & "]")
    DllStructSetData($stMONITORINFOEX, 1, DllStructGetSize($stMONITORINFOEX))

    $nResult = DllCall("user32.dll", "int", "GetMonitorInfo", _
                                            "hwnd", $hMonitor, _
                                            "ptr", DllStructGetPtr($stMONITORINFOEX))
    If $nResult[0] = 1 Then
        $arMonitorInfos[0] = DllStructGetData($stMONITORINFOEX, 2, 1) & ";" & _
            DllStructGetData($stMONITORINFOEX, 2, 2) & ";" & _
            DllStructGetData($stMONITORINFOEX, 2, 3) & ";" & _
            DllStructGetData($stMONITORINFOEX, 2, 4)
        $arMonitorInfos[1] = DllStructGetData($stMONITORINFOEX, 3, 1) & ";" & _
            DllStructGetData($stMONITORINFOEX, 3, 2) & ";" & _
            DllStructGetData($stMONITORINFOEX, 3, 3) & ";" & _
            DllStructGetData($stMONITORINFOEX, 3, 4)
        $arMonitorInfos[2] = DllStructGetData($stMONITORINFOEX, 4)
        $arMonitorInfos[3] = DllStructGetData($stMONITORINFOEX, 5)
    EndIf

    Return $nResult[0]
EndFunc

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BugFix    28

BugFix
Posted

I've made sometimes the following function for this:

;===============================================================================
; Function Name:   _GetTaskBarProps($hProperty="")
; Description::    Gets the Taskbar properties
; Parameter(s):    $_hProperty    propertiy, you want to get
;                                 "" (default) returns rectangle of taskbar as array [left,top,right,bottom]
;                                 "top"    - X1 left position
;                                 "left"   - Y1 top position
;                                 "height" - Y2-Y1 height of taskbar
;                                 "width"  - X2-X1 width of taskbar
;                                 "align"  - Alignment (Clockwise): 1=right, 2=bottom, 3=left, 4=top
;                  $_fAlignAsStr  TRUE returns alignment as string (left, top, right, bottom), FALSE (default) as number
; Return Value(s): see $_hProperty
; Author(s):       BugFix (bugfix@autoit.de)
;===============================================================================
Func _GetTaskBarProps($_hProperty="", $_fAlignAsStr=False)
    Local $tRect = DllStructCreate("long;long;long;long"), $hWnd, $ret, $vRet, $aAlign[5] = ['', 'right', 'bottom', 'left', 'top']
    $_hProperty = StringStripWS($_hProperty, 3)
    $ret = DllCall("user32.dll", 'long', "FindWindowA", 'str', "Shell_traywnd", 'str', "")
    $hWnd = $ret[0]
    DllCall("User32.dll", "int", "GetWindowRect", "hwnd", $hWnd, "ptr", DllStructGetPtr($tRect))
    Local $left   = DllStructGetData($tRect, 1)
    Local $top    = DllStructGetData($tRect, 2)
    Local $right  = DllStructGetData($tRect, 3)
    Local $bottom = DllStructGetData($tRect, 4)
    If $_hProperty = "" Then
        Local $aOut[4] = [$left, $top, $right, $bottom]
        Return $aOut
    EndIf
    Switch $_hProperty
        Case "top"
            Return $top
        Case "left"
            Return $left
        Case "height"
            Return $bottom - $top
        Case "width"
            Return $right - $left
        Case "align"
            If $top < 1 And $left < 1 Then
                    If $bottom > $right Then $vRet = 3
                    If $right > $bottom Then $vRet = 4
            ElseIf $top < 1 And $left > 0 Then
                $vRet = 1
            Else
                $vRet = 2
            EndIf
    EndSwitch
    If $_fAlignAsStr Then Return $aAlign[$vRet]
    Return $vRet
EndFunc  ;==>_GetTaskBarProps

Best Regards BugFix  

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BrewManNH    1,122

BrewManNH
Posted (edited)

This script doesn't get the primary monitor's dimensions, it gets the total desktop width (dual monitors on my setup), then subtracts the taskbar height from the desktop height but doesn't take into account you might have more than one monitor.

Not to mention, it's poorly written.

EDIT: Just wanted to make a note here that this reply was to the OP, and not to BugFix's post.

Edited by BrewManNH

If I posted any code, assume that code was written using the latest release version unless stated otherwise. Also, if it doesn't work on XP I can't help with that because I don't have access to XP, and I'm not going to.
Give a programmer the correct code and he can do his work for a day. Teach a programmer to debug and he can do his work for a lifetime - by Chirag Gude
How to ask questions the smart way!

I hereby grant any person the right to use any code I post, that I am the original author of, on the autoitscript.com forums, unless I've specifically stated otherwise in the code or the thread post. If you do use my code all I ask, as a courtesy, is to make note of where you got it from.

Back up and restore Windows user files _Array.au3 - Modified array functions that include support for 2D arrays.  -  ColorChooser - An add-on for SciTE that pops up a color dialog so you can select and paste a color code into a script.  -  Customizable Splashscreen GUI w/Progress Bar - Create a custom "splash screen" GUI with a progress bar and custom label.  -  _FileGetProperty - Retrieve the properties of a file  -  SciTE Toolbar - A toolbar demo for use with the SciTE editor  -  GUIRegisterMsg demo - Demo script to show how to use the Windows messages to interact with controls and your GUI.  -   Latin Square password generator

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Melba23    2,807

Melba23
Posted

timmy2,

Rather than use those old functions, why not use something much simpler to get the useable desktop area? ;)

#include <Array.au3> ; Just for display

$aDeskTopData = _DeskTopData()
$iError = @error
If IsArray($aDeskTopData) Then
    _ArrayDisplay($aDeskTopData)
Else
    MsgBox(0, "Error", $iError)
EndIf

Func _DeskTopData()

    Local $tWorkArea
    ; Determine which struct syntax to use to use
    If @AutoItVersion < "3.3.8.0" Then
        $tWorkArea = DllStructCreate("long Left;long Top;long Right;long Bottom")
    Else
        $tWorkArea = DllStructCreate("struct;long Left;long Top;long Right;long Bottom;endstruct")
    EndIf

    ; Determine available work area ; $SPI_GETWORKAREA = 48
    DllCall("user32.dll", "bool", "SystemParametersInfoW", "uint", 48, "uint", 0, "ptr", DllStructGetPtr($tWorkArea), "uint", 0)
    If @error Then
        Return SetError(2, 0, "")
    EndIf
    Local $aDeskTopData[5] = [DllStructGetData($tWorkArea, "Left"), DllStructGetData($tWorkArea, "Top"), _
            DllStructGetData($tWorkArea, "Right"), DllStructGetData($tWorkArea, "Bottom"), 1] ; Assume taskbar visible

    ; Check if Taskbar is hidden
    Local $aRet = DllCall("shell32.dll", "uint", "SHAppBarMessage", "dword", 0x00000004, "ptr*", 0) ; $ABM_GETSTATE
    If @error Then
        Return SetError(1, 0, "")
    EndIf
    If BitAND($aRet[0], 0x01) Then
        $aDeskTopData[4] = 0 ; Set to hidden
    EndIf

    Return $aDeskTopData

EndFunc   ;==>_DeskTopData
I leave you to do the maths to find out the width and height. ;)

 

M23

Any of my own code posted anywhere on the forum is available for use by others without any restriction of any kind._______My UDFs:

Spoiler

ArrayMultiColSort ---- Sort arrays on multiple columns
ChooseFileFolder ---- Single and multiple selections from specified path treeview listing
Date_Time_Convert -- Easily convert date/time formats, including the language used
ExtMsgBox --------- A highly customisable replacement for MsgBox
GUIExtender -------- Extend and retract multiple sections within a GUI
GUIFrame ---------- Subdivide GUIs into many adjustable frames
GUIListViewEx ------- Insert, delete, move, drag, sort, edit and colour ListView items
GUITreeViewEx ------ Check/clear parent and child checkboxes in a TreeView
Marquee ----------- Scrolling tickertape GUIs
NoFocusLines ------- Remove the dotted focus lines from buttons, sliders, radios and checkboxes
Notify ------------- Small notifications on the edge of the display
Scrollbars ----------Automatically sized scrollbars with a single command
StringSize ---------- Automatically size controls to fit text
Toast -------------- Small GUIs which pop out of the notification area

 

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kaotkbliss    139

kaotkbliss
Posted

I haven't looked at the code, but it also probably doesn't take into account where the taskbar is. rarely I've seen the taskbar along the side of the screen.

I've also noticed that taskbar functions I've found here will sometimes not return the correct properties causing unexpected behavior in scripts (I've only used getting taskbar properties in a loop to catch changes that might be made) so I use this to get the taskbar properties.

$tray = WinGetPos("[CLASS:Shell_TrayWnd]")

With that and these functions, I'm able to calculate the usable screen area

Global $__MonitorList[1][5]
$__MonitorList[0][0] = 0

#Region thanks to xrxca for these functions
Func _GetMonitorFromPoint($XorPoint = 0, $y = 0)
    Local $MousePos, $myX, $myY
    If @NumParams = 0 Then
        $MousePos = MouseGetPos()
        $myX = $MousePos[0]
        $myY = $MousePos[1]
    ElseIf (@NumParams = 1) And IsArray($XorPoint) Then
        $myX = $XorPoint[0]
        $myY = $XorPoint[1]
    Else
        $myX = $XorPoint
        $myY = $y
    EndIf
    If $__MonitorList[0][0] == 0 Then
        _GetMonitors()
    EndIf
    Local $i = 0
    Local $Monitor = 0
    For $i = 1 To $__MonitorList[0][0]
        If ($myX >= $__MonitorList[$i][1]) _
                And ($myX < $__MonitorList[$i][3]) _
                And ($myY >= $__MonitorList[$i][2]) _
                And ($myY < $__MonitorList[$i][4]) Then $Monitor = $i
    Next
    Return $Monitor
EndFunc   ;==>_GetMonitorFromPoint

Func _GetMonitors()
    $__MonitorList[0][0] = 0 ;  Added so that the global array is reset if this is called multiple times
    Local $handle = DllCallbackRegister("_MonitorEnumProc", "int", "hwnd;hwnd;ptr;lparam")
    DllCall("user32.dll", "int", "EnumDisplayMonitors", "hwnd", 0, "ptr", 0, "ptr", DllCallbackGetPtr($handle), "lparam", 0)
    DllCallbackFree($handle)
    Local $i = 0
    For $i = 1 To $__MonitorList[0][0]
        If $__MonitorList[$i][1] < $__MonitorList[0][1] Then $__MonitorList[0][1] = $__MonitorList[$i][1]
        If $__MonitorList[$i][2] < $__MonitorList[0][2] Then $__MonitorList[0][2] = $__MonitorList[$i][2]
        If $__MonitorList[$i][3] > $__MonitorList[0][3] Then $__MonitorList[0][3] = $__MonitorList[$i][3]
        If $__MonitorList[$i][4] > $__MonitorList[0][4] Then $__MonitorList[0][4] = $__MonitorList[$i][4]
    Next
    Return $__MonitorList
EndFunc   ;==>_GetMonitors

Func _MonitorEnumProc($hMonitor, $hDC, $lRect, $lParam)
    Local $Rect = DllStructCreate("int left;int top;int right;int bottom", $lRect)
    $__MonitorList[0][0] += 1
    ReDim $__MonitorList[$__MonitorList[0][0] + 1][5]
    If $hDC = $hDC Then
    EndIf
    If $lParam = $lParam Then
    EndIf
    $__MonitorList[$__MonitorList[0][0]][0] = $hMonitor
    $__MonitorList[$__MonitorList[0][0]][1] = DllStructGetData($Rect, "left")
    $__MonitorList[$__MonitorList[0][0]][2] = DllStructGetData($Rect, "top")
    $__MonitorList[$__MonitorList[0][0]][3] = DllStructGetData($Rect, "right")
    $__MonitorList[$__MonitorList[0][0]][4] = DllStructGetData($Rect, "bottom")
    Return 1 ; Return 1 to continue enumeration
EndFunc   ;==>_MonitorEnumProc
#EndRegion thanks to xrxca for these functions

010101000110100001101001011100110010000001101001011100110010000

001101101011110010010000001110011011010010110011100100001

My Android cat and mouse game
https://play.google.com/store/apps/details?id=com.KaosVisions.WhiskersNSqueek

We're gonna need another Timmy!

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