Dialog return value

[r0n]

If I have dialog in a function called "test_return_value", how can I return any value (negative, 0 or positive) upon pressing a button in that dialog?
For example the below dialog, see button text. (Preferably without using thread/global vairables.)

If want to use the function "test_return_value" function like this:

Code:

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if(test_return_value=-77) out "-77"

I can't do it with: DT_Ret(hDlg -77), DT_Ok(hDlg -77), DT_EndDialog(hDlg -77), ...
(if it is possible, then I am using in an incorrect way).

Function test_return_value

Code:

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str dd=
;BEGIN DIALOG
;0 "" 0x90C80AC8 0x0 0 0 224 136 "Dialog"
;3 Button 0x54032000 0x0 72 44 86 39 "upon pressing this button, close this dialog and return -77"
;END DIALOG
;DIALOG EDITOR: "" 0x2040601 "*" "" "" ""

if(!ShowDialog(dd &sub.DlgProc 0)) 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 3
,,;; When this button is pressed
,,;; 1. Close this dialog
,,;; 2. Return: -77
,,;; ...
ret 1