_ChangeScreenResEx

[zeffy]

It works fine when I use

_ChangeScreenResEx(1, 800, 600)

but it sets @error to 1, and doesnt do anything. If I use

_ChangeScreenResEx(1, 1366, 768)

which is my default screen resolution, can someone help me with this?

Thanks, Zef.

[zeffy]

26 views and no replies? please i really need help D:

[martin]

26 views and no replies? please i really need help D:

Difficult to help because I have no idea what _ChangeScreenResEx is so you need to either show us the code or at least give a link. Then maybe tell us what OS you are using.

[zeffy]

Difficult to help because I have no idea what _ChangeScreenResEx is so you need to either show us the code or at least give a link. Then maybe tell us what OS you are using.

Oh, sorry I posted this thread really early in the morning, here's the code.

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;===============================================================================
; Function Name:    _ChangeScreenResEx()
; Description:    Changes the current screen geometry, colour and refresh rate.
; Version:        1.0.0.0
; Parameter(s):  $i_DisplayNum - Display to change, starting at 1
;                  $i_Width - Width of the desktop screen in pixels. (horizontal resolution)
;                  $i_Height - Height of the desktop screen in pixels. (vertical resolution)
;                   $i_BitsPP - Depth of the desktop screen in bits per pixel.
;                   $i_RefreshRate - Refresh rate of the desktop screen in hertz.
; Requirement(s):   AutoIt Beta > 3.1
; Return Value(s):  On Success - Screen is adjusted, @ERROR = 0
;                  On Failure - sets @ERROR = 1
; Forum(s):
; Author(s):        Original code - psandu.ro, PartyPooper
;                  Modifications - bobchernow
;===============================================================================
Func _ChangeScreenResEx($i_DisplayNum = 1, $i_Width = @DesktopWidth, $i_Height = @DesktopHeight, $i_BitsPP = @DesktopDepth, $i_RefreshRate = @DesktopRefresh)
    Local Const $DM_PELSWIDTH = 0x00080000
    Local Const $DM_PELSHEIGHT = 0x00100000
    Local Const $DM_BITSPERPEL = 0x00040000
    Local Const $DM_DISPLAYFREQUENCY = 0x00400000
    Local Const $CDS_TEST = 0x00000002
    Local Const $CDS_UPDATEREGISTRY = 0x00000001
    Local Const $DISP_CHANGE_RESTART = 1
    Local Const $DISP_CHANGE_SUCCESSFUL = 0
    Local Const $HWND_BROADCAST = 0xffff
    Local Const $WM_DISPLAYCHANGE = 0x007E
    If $i_Width = "" Or $i_Width = -1 Then $i_Width = @DesktopWidth; default to current setting
    If $i_Height = "" Or $i_Height = -1 Then $i_Height = @DesktopHeight; default to current setting
    If $i_BitsPP = "" Or $i_BitsPP = -1 Then $i_BitsPP = @DesktopDepth; default to current setting
    If $i_RefreshRate = "" Or $i_RefreshRate = -1 Then $i_RefreshRate = @DesktopRefresh; default to current setting
    Local $DEVMODE = DllStructCreate("byte[32];int[10];byte[32];int[6]")
    Local $s_Display

    $s_Display = "\\.\Display" & $i_DisplayNum

    Local $B = DllCall("user32.dll", "int", "EnumDisplaySettings", "ptr", 0, "int", 0, "ptr", DllStructGetPtr($DEVMODE))

    If @error Then
        $B = 0
        SetError(1)
        Return $B
    Else
        $B = $B[0]
    EndIf
    If $B <> 0 Then
        DllStructSetData($DEVMODE, 2, BitOR($DM_PELSWIDTH, $DM_PELSHEIGHT, $DM_BITSPERPEL, $DM_DISPLAYFREQUENCY), 5)
        DllStructSetData($DEVMODE, 4, $i_Width, 2)
        DllStructSetData($DEVMODE, 4, $i_Height, 3)
        DllStructSetData($DEVMODE, 4, $i_BitsPP, 1)
        DllStructSetData($DEVMODE, 4, $i_RefreshRate, 5)

        $B = DllCall("user32.dll", "int", "ChangeDisplaySettingsEx","str", $s_Display, "ptr", DllStructGetPtr($DEVMODE), "hwnd", 0, "dword", $CDS_TEST, "lparam", 0)
        If @error Then
            $B = -1
        Else
            $B = $B[0]
        EndIf
        Select
            Case $B = $DISP_CHANGE_RESTART
                $DEVMODE = ""
                Return 2
            Case $B = $DISP_CHANGE_SUCCESSFUL
                DllCall("user32.dll", "int", "ChangeDisplaySettingsEx","str", $s_Display, "ptr", DllStructGetPtr($DEVMODE), "hwnd", 0, "dword", $CDS_UPDATEREGISTRY, "lparam", 0)
                DllCall("user32.dll", "int", "SendMessage", "hwnd", $HWND_BROADCAST, "int", $WM_DISPLAYCHANGE, _
                        "int", $i_BitsPP, "int", $i_Height * 2 ^ 16 + $i_Width)
                $DEVMODE = ""
                Return 1
            Case Else
                $DEVMODE = ""
                SetError(1)
                Return $B
        EndSelect
    EndIf
EndFunc;==>_ChangeScreenResEx

And I'm on Windows 7 Ultimate 64-bit

[zeffy]

bump, I posted what you said you needed to help.

[MvGulik]

whatever Edited February 7, 2011 by MvGulik

[zeffy]

DLLcaling not my thing, but ...

There are two SetError() in that code. And both set it to 1.

Change the first one to SetError(91) and the lower one to SetError(92). Than rerun you code. And report back the error value you got that time.

Might narrow it down a bit.

---

Change the first to SetError(91,@extended), and include the extended value to in case you got a 91 error.

Thanks for replying, I did what you said, and @error returned 92

[MvGulik]

whatever Edited February 7, 2011 by MvGulik

[zeffy]

92. ok

Looking at MSDN:ChangeDisplaySettingsEx, section: Return Value.

There it lists the possible return states.

By changing SetError(92) to SetError(92,$ you can get the value that was actually returned by the dllcall. (as @extended value)

And that value can be used to Identity the failure reason ... one problem though.

This UDF Code only contains 2 of the possible 7 returned states. And I don't know where or how to find those others.

Post that value and hopefully someone else might tell you which on that is.

$B = -2

Edited May 3, 2010 by zeffy

[MvGulik]

whatever Edited February 7, 2011 by MvGulik

[zeffy]

Public Const DISP_CHANGE_SUCCESSFUL = 0

Public Const DISP_CHANGE_RESTART = 1

Public Const DISP_CHANGE_FAILED = -1

Public Const DISP_CHANGE_BADMODE = -2 -> The graphics mode is not supported.

Public Const DISP_CHANGE_NOTUPDATED = -3

Public Const DISP_CHANGE_BADFLAGS = -4

Public Const DISP_CHANGE_BADPARAM = -5

Ps: I'm off.

well, that's disappointing, i had another idea to do the same thing. Thanks for the help.