New to this and could use some help/input

[Gintaras]

Function Dialog213

Code:

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str dd=
;BEGIN DIALOG
;0 "" 0x90C80AC8 0x0 0 0 224 136 "Dialog"
;3 Edit 0x54032000 0x200 8 8 64 12 ""
;1 Button 0x54030001 0x4 116 116 48 14 "OK"
;2 Button 0x54030000 0x4 168 116 48 14 "Cancel"
;END DIALOG
;DIALOG EDITOR: "" 0x2040500 "*" "" "" ""

str controls = "3"
str e3
if(!ShowDialog(dd &sub.DlgProc &controls)) ret


#sub DlgProc
function# hDlg message wParam lParam

sel message
,case WM_INITDIALOG
,SendMessage id(3 hDlg) EM_LIMITTEXT 4 0 ;;max 4 characters
,case WM_DESTROY
,case WM_COMMAND goto messages2
ret
;messages2
sel wParam
,case IDOK
,case IDCANCEL
,case EN_MAXTEXT<<16|3
,mes "Max length 4"
ret 1