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Multiple monitor positions and dimensions

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I know a little about DLLs and Structs, but not quite enough to figure out how this works. Basically, I want to be able to create a window that is exactly the right size and position to completely fill up any given monitor except for the primary one attached to a system. To do this I need to find out how many monitors are attached (so the program will fail if there's only one monitor, and offer a choice if there's more than two), and what the dimensions and absolute positions of each monitor are.

MSDN has this information about monitors, but I couldn't make heads nor tails of it:


And while searching around, I found this, which looks very helpful but it's in VB:


Can any experienced developers give me a hand with the DLL calls, or maybe find another (hopefully easier) way to get this done?

Edited by Sokko
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to get the list of monitors maybe scriptomatic will help you out.

So long,


Scripts & functions Organize Includes Let Scite organize the include files

Yahtzee The game "Yahtzee" (Kniffel, DiceLion)

LoginWrapper Secure scripts by adding a query (authentication)

_RunOnlyOnThis UDF Make sure that a script can only be executed on ... (Windows / HD / ...)

Internet-Café Server/Client Application Open CD, Start Browser, Lock remote client, etc.

MultipleFuncsWithOneHotkey Start different funcs by hitting one hotkey different times

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Thanks for the pointer. Unfortunately, I was unable to find a class that would provide the needed information, though admittedly I don't really know anything at all about classes or WMI. Have you found a class that provides the multiple-monitor info?

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just on the fly before I'm going to LV...

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])


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

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)
    Return $nResult[0]

Maybe you find it helpfull...


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Wow, thanks! I'll be sure to save that code for later. In this case, though, I just recently found an easier way around it: Have the user drag a "stub" window onto the desired monitor and click a button, then delete the stub, create the actual GUI at the same location (using WinGetPos) with the $WS_MAXIMIZE style, and retrieve its width and height to get the monitor's dimensions (again with WinGetPos).

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