#Include "windows.bi"

Dim As HWND Window_Main, Edit_Number, Button_Inc, Button_Rnd
Dim As MSG msg
Dim As Integer n
Dim As String text

'Create a window with an input field and two buttons:
Window_Main = CreateWindow("#32770", "GUI Component Interaction", WS_OVERLAPPEDWINDOW Or WS_VISIBLE, 100, 100, 250, 200, 0, 0, 0, 0)
Var Static_Number = CreateWindow("STATIC", "Value:", WS_VISIBLE Or WS_CHILD, 10, 10, 100, 20, Window_Main, 0, 0, 0)
Edit_Number = CreateWindow("EDIT", "0", WS_BORDER Or WS_VISIBLE Or WS_CHILD Or ES_AUTOHSCROLL Or ES_Number, 110, 10, 100, 20, Window_Main, 0, 0, 0)
Button_Inc = CreateWindow("BUTTON", "Increment", WS_VISIBLE Or WS_CHILD, 110, 40, 100, 20, Window_Main, 0, 0, 0)
Button_Rnd = CreateWindow("BUTTON", "Random", WS_VISIBLE Or WS_CHILD, 110, 70, 100, 20, Window_Main, 0, 0, 0)
													
'Windows message loop:
While GetMessage(@msg, Window_Main, 0, 0)
  TranslateMessage(@msg)
  DispatchMessage(@msg)
  Select Case msg.hwnd
    Case Button_Inc
      If msg.message = WM_LBUTTONDOWN Then
	'Increment value:
	text = Space(GetWindowTextLength(Edit_Number) + 1) 'Buffer for the text
	GetWindowText(Edit_Number, text, Len(text))
	n = Val(text)
	SetWindowText(Edit_Number, Str(n + 1))
      End If
    Case Button_Rnd
      If msg.message = WM_LBUTTONDOWN THEN
	'Random value (max. 100000):
	If MessageBox(0, "Set input field to random value?", "Please confirm", MB_ICONQUESTION Or MB_YESNO) = IDYES Then
	  n = 100000 * RND
	  SetWindowText(Edit_Number, Str(n))
	End If
      End If
    Case Window_Main
      If msg.message = WM_COMMAND Then End
  End Select
Wend

End