Desktop Workarea, multiple monitors

[MarkRobbins]

I can get the 'workarea' of the primary monitor using:

Func _GetDesktopArea()
  Local Const $SPI_GETWORKAREA = 48
  Local $tWorkArea = DllStructCreate($tagRECT)
  _WinAPI_SystemParametersInfo($SPI_GETWORKAREA, 0, DllStructGetPtr($tWorkArea))
  Local $aReturn[4] = [DllStructGetData($tWorkArea, "Left"), DllStructGetData($tWorkArea, "Top"), _
          DllStructGetData($tWorkArea, "Right") - DllStructGetData($tWorkArea, "Left"), DllStructGetData($tWorkArea, "Bottom") - DllStructGetData($tWorkArea, "Top")]
  Return $aReturn
EndFunc   ;==>_GetDesktopArea

MSDN says to use GetMonitorInfo() to get workarea of monitors other than the Primary.

However, when I do this the rect I receive from this function for Primary or Secondary is not a workarea, but a fullscreen rect.

#include <WinApi.au3>
#include <Array.au3>
#include <StructureConstants.au3>


;get monitor handles
Local $edm=_WinAPI_EnumDisplayMonitors();$hDC = 0, $tRECT = 0
If @Error Then MsgBox(0,'Error','_WinAPI_EnumDisplayMonitors')

Local $mh1=$edm[2][0]; 1 for first handle, 2 for second
Local $mr1=$edm[1][1]; supposedly a rect

; use my handle to get monitor infos
Local $vh=_WinAPI_GetMonitorInfo($mh1)
If @Error Then MsgBox(0,'Error','_WinAPI_GetMonitorInfo')
; $vh now filled with
; [0] - $tagRECT structure that specifies the display monitor rectangle, in virtual-screen coordinates.
; [1] - $tagRECT structure that specifies the work area rectangle of the display monitor that can be used by applications, in virtual-screen coordinates.
; [2] - 1 (True) for the primary display monitor, or 0 (False) otherwise.
; [3] - The device name of the monitor being used, e.g. "\\.\DISPLAY1".

Local $aReturn[4] = [DllStructGetData($vh[1], 'Left') _
                    ,DllStructGetData($vh[1], 'Top') _
                    ,DllStructGetData($vh[1], 'Right') - DllStructGetData($vh[1], 'Left') _
                    ,DllStructGetData($vh[1], 'Bottom') - DllStructGetData($vh[1], 'Top') _
                    ]

_ArrayDisplay($aReturn)
Exit

So to reiterate- the MonitorInfo workarea rect does not jive with the one gotten with SPI for the Primary monitor, therefore it doesn't work for the Secondary monitor either - it just gets the true (virtual) dimensions.

I smell a Microsoft thing. I have looked on StackOverflow with no success. Can anyone get a workarea!=desktop with this code?

Edited July 30, 2013 by MarkRobbins

[guinness]

MarkRobbins got that function from here.

[jaberwacky]

Seems like it returns the correct information.  The reason that it wouldn't return the whole display coords on the first mon is because of the taskbar.  The opposite for the second monitor.  This is my theory.  I'm not a Windows guru.