Last updated: 26. 1.1998, 23:36
<* +M2EXTENSIONS *> MODULE ClipView; (*----------------------------------------- CLIPVIEW.C --- Simple Clipboard Viewer (c) Charles Petzold, 1996 ClipView.mod --- Translation to XDS Modula-2 (c) Peter Stadler, 1997 -----------------------------------------*) IMPORT Windows; IMPORT SYSTEM; CONST szAppName= "ClipView"; VAR hwnd : Windows.HWND; msg : Windows.MSG; wc : Windows.WNDCLASSEX; hwndNextViewer : Windows.HWND; hGMem : Windows.HGLOBAL; hdc : Windows.HDC; pGMem : Windows.PSTR; ps : Windows.PAINTSTRUCT; rect : Windows.RECT; rc : Windows.RECT; (*++++*****************************************************************) PROCEDURE [Windows.CALLBACK] WndProc (hwnd : Windows.HWND; (**********************************************************************) iMsg : Windows.UINT; wParam : Windows.WPARAM; lParam : Windows.LPARAM) : Windows.LRESULT; BEGIN CASE (iMsg) OF | Windows.WM_CREATE : hwndNextViewer := Windows.SetClipboardViewer (hwnd); RETURN 0; | Windows.WM_CHANGECBCHAIN : IF (SYSTEM.CAST(Windows.HWND,wParam) = hwndNextViewer) THEN hwndNextViewer := SYSTEM.CAST(Windows.HWND,lParam); ELSIF (hwndNextViewer#NIL) THEN Windows.SendMessage (hwndNextViewer, iMsg, wParam, lParam); END; RETURN 0; | Windows.WM_DRAWCLIPBOARD : IF (hwndNextViewer#NIL) THEN Windows.SendMessage (hwndNextViewer, iMsg, wParam, lParam); END; Windows.InvalidateRect (hwnd, rc, TRUE); RETURN 0; | Windows.WM_PAINT : hdc := Windows.BeginPaint (hwnd, ps); Windows.GetClientRect (hwnd, rect); Windows.OpenClipboard (hwnd); hGMem := SYSTEM.CAST(Windows.HGLOBAL,Windows.GetClipboardData (Windows.CF_TEXT)); IF (hGMem # NIL) THEN pGMem := SYSTEM.CAST(Windows.PSTR,Windows.GlobalLock (hGMem)); Windows.DrawText (hdc, pGMem, -1, rect, Windows.DT_EXPANDTABS); Windows.GlobalUnlock (hGMem); END; Windows.CloseClipboard (); Windows.EndPaint (hwnd, ps); RETURN 0; | Windows.WM_DESTROY : Windows.ChangeClipboardChain (hwnd, hwndNextViewer); 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 := NIL; 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 ( SYSTEM.ADR(szAppName), (* window class name *) "Simple Clipboard Viewer (Text only): XDS Modula-2", (* window caption *) Windows.WS_OVERLAPPEDWINDOW, (* window style *) Windows.CW_USEDEFAULT, (* initial x position *) Windows.CW_USEDEFAULT, (* initial y position *) Windows.CW_USEDEFAULT, (* initial x size *) Windows.CW_USEDEFAULT, (* initial y size *) NIL, (* parent window handle *) NIL, (* window menu handle *) wc.hInstance, (* program instance handle *) NIL); (* creation parameters *) IF hwnd = NIL THEN RETURN FALSE; END; Windows.ShowWindow (hwnd, Windows.SW_SHOWDEFAULT); Windows.UpdateWindow (hwnd); RETURN TRUE; END InitMainWindow; BEGIN IF InitApplication() AND InitMainWindow() THEN WHILE (Windows.GetMessage(msg,NIL,0,0)) DO Windows.TranslateMessage(msg); Windows.DispatchMessage(msg); END; END; END ClipView.