Last updated: 18. 1.1998, 12:43
<* +M2EXTENSIONS *> MODULE Beeper1; (*----------------------------------------- BEEPER1.C --- Timer Demo Program No. 1 (c) Charles Petzold, 1996 Beeper1.mod --- Translation to XDS Modula-2 (c) Peter Stadler, 1997 -----------------------------------------*) IMPORT Windows; IMPORT SYSTEM; CONST ID_TIMER = 1; CONST szAppName = "Beeper1"; VAR hwnd : Windows.HWND; msg : Windows.MSG; wc : Windows.WNDCLASSEX; fFlipFlop : BOOLEAN; (*++++*****************************************************************) PROCEDURE [Windows.CALLBACK] WndProc (hwnd : Windows.HWND; (**********************************************************************) iMsg : Windows.UINT; wParam : Windows.WPARAM; lParam : Windows.LPARAM) : Windows.LRESULT; VAR hBrush : Windows.HBRUSH; hdc : Windows.HDC; ps : Windows.PAINTSTRUCT; rc : Windows.RECT; BEGIN CASE (iMsg) OF | Windows.WM_TIMER : Windows.MessageBeep (SYSTEM.CAST(Windows.MB_SET,0)); fFlipFlop := NOT fFlipFlop; Windows.InvalidateRect (hwnd, NIL, FALSE); RETURN 0; | Windows.WM_PAINT : hdc := Windows.BeginPaint (hwnd, ps); Windows.GetClientRect (hwnd, rc); IF(fFlipFlop=TRUE) THEN hBrush := Windows.CreateSolidBrush (Windows.RGB(255,0,0)); ELSE hBrush := Windows.CreateSolidBrush (Windows.RGB(0,0,255)); END; Windows.FillRect (hdc, rc, hBrush); Windows.EndPaint (hwnd, ps); Windows.DeleteObject (SYSTEM.CAST(Windows.HGDIOBJ,hBrush)); RETURN 0; | Windows.WM_DESTROY : Windows.KillTimer (hwnd, ID_TIMER); Windows.PostQuitMessage (0); RETURN 0; ELSE RETURN Windows.DefWindowProc (hwnd, iMsg, wParam, lParam); END; END WndProc; (*++++*****************************************************************) PROCEDURE InitApplication () : BOOLEAN; (**********************************************************************) BEGIN wc.cbSize := SIZE(wc); wc.style := Windows.CS_HREDRAW + Windows.CS_VREDRAW; wc.lpfnWndProc := WndProc; wc.cbClsExtra := 0; wc.cbWndExtra := 0; wc.hInstance := Windows.MyInstance(); wc.hIcon := Windows.LoadIcon (NIL, Windows.IDI_APPLICATION); wc.hCursor := Windows.LoadCursor (NIL, Windows.IDC_ARROW); wc.hbrBackground := SYSTEM.CAST(Windows.HBRUSH, Windows.GetStockObject (Windows.WHITE_BRUSH)); wc.lpszMenuName := NIL; wc.lpszClassName := SYSTEM.ADR(szAppName); wc.hIconSm := Windows.LoadIcon (NIL,Windows.IDI_APPLICATION); RETURN Windows.RegisterClassEx(wc)#0; END InitApplication; (*++++*****************************************************************) PROCEDURE InitMainWindow () : BOOLEAN; (**********************************************************************) BEGIN hwnd := Windows.CreateWindow (szAppName, "Beeper1 Timer Demo: Translation to XDS Modula-2", Windows.WS_OVERLAPPEDWINDOW, Windows.CW_USEDEFAULT, Windows.CW_USEDEFAULT, Windows.CW_USEDEFAULT, Windows.CW_USEDEFAULT, NIL, NIL, Windows.MyInstance(), NIL); WHILE(Windows.SetTimer (hwnd, ID_TIMER, 1000, NIL)=0) DO IF(Windows.IDCANCEL = Windows.MessageBox (hwnd, "Too many clocks or timers!", szAppName, Windows.MB_ICONEXCLAMATION + Windows.MB_RETRYCANCEL)) THEN RETURN FALSE; END; END; Windows.ShowWindow (hwnd, Windows.SW_SHOWDEFAULT); Windows.UpdateWindow (hwnd); RETURN TRUE; END InitMainWindow; BEGIN fFlipFlop := FALSE; IF InitApplication() AND InitMainWindow() THEN WHILE (Windows.GetMessage(msg,NIL,0,0)) DO Windows.TranslateMessage(msg); Windows.DispatchMessage(msg); END; END; END Beeper1.