#include-once
;===============================================================================
; 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