How to set control text

[win]

I am a newbie. I am learning programming. I want to implement a simple function.

When I click the button(est edit text), the control(edit) displays the character "hello world"

I hope someone can tell me how to write code, thanks in advance

Macro Macro1
Trigger SF9     

Code:

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str dd=
;BEGIN DIALOG
;0 "" 0x90C80AC8 0x0 0 0 320 166 "Dialog"
;3 Edit 0x54030080 0x200 48 36 128 13 "edt"
;4 Button 0x54032000 0x0 52 136 62 14 "set edit text"
;1 Button 0x54030001 0x4 192 136 48 14 "OK"
;2 Button 0x54030000 0x4 256 136 48 14 "Cancel"
;END DIALOG
;DIALOG EDITOR: "" 0x2040700 "*" "" "" ""

str controls = "3"
str e3edt
if(!ShowDialog(dd &sub.DlgProc &controls)) ret

#sub DlgProc
function# hDlg message wParam lParam

sel message
,case WM_INITDIALOG
,case WM_DESTROY
,case WM_COMMAND goto messages2
ret
;messages2
sel wParam
,case IDOK
,case IDCANCEL
,case 4 ;;set edit text
,?????????????
ret 1