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#include <GUIConstantsEx.au3>
#include <WindowsConstants.au3>
$GUI_Main = GUICreate("My GUI") ; will create a dialog box that when displayed is centered
GUISetState(@SW_SHOW)
_GuiRoundCorners($GUI_Main, 100, 0, 40, 40, 0)
While 1
$msg = GUIGetMsg()
If $msg = $GUI_EVENT_CLOSE Then ExitLoop
WEnd
; Round corners function
; Last optional parameter $BotCrnrs - Default 1 (True) shows bottom rounded corners
; - 0 (False) shows square bottom corners
Func _GuiRoundCorners($h_win, $i_x1, $i_y1, $i_x3, $i_y3, $BotCrnrs = True); thanks gafrost
Local $XS_pos, $XS_ret, $XS_ret2
$XS_pos = WinGetPos($h_win)
If Not $BotCrnrs Then $ret2 = DllCall("gdi32.dll", "long", "CreateRectRgn", "long", _
$i_x1, "long", $XS_pos[3]-$i_y3, "long", $XS_pos[2]-1, "long", $XS_pos[3])
$XS_ret = DllCall("gdi32.dll", "long", "CreateRoundRectRgn", _
"long", $i_x1, _
"long", $i_y1, _
"long", $XS_pos[2], _
"long", $XS_pos[3], _
"long", $i_x3, _
"long", $i_y3)
If Not $BotCrnrs Then DllCall("gdi32.dll", "long", "CombineRgn", "long", $XS_ret[0], "long", $XS_ret[0], _
"long", $ret2[0], "int", 2)
If $XS_ret[0] Then
$XS_ret = DllCall("user32.dll", "long", "SetWindowRgn", "hwnd", $h_win, "long", $XS_ret[0], "int", 1)
EndIf
EndFunc ;==>_GuiRoundCorners