Last updated: 11. 1.1998, 17:45
<*/NOWARN:F*> MODULE ShowBit; (*----------------------------------------------------------- SHOWBIT.C --- Shows bitmaps in BITLIB dynamic link library (c) Charles Petzold, 1996 ShowBit.mod --- Translation to Stony Brook Modula-2 (c) Peter Stadler, 1998 -----------------------------------------------------------*) IMPORT SYSTEM; IMPORT WINUSER; IMPORT WIN32; IMPORT WINGDI; IMPORT Strings; IMPORT WINX; CONST szAppName = "ShowBit"; VAR hwnd : WIN32.HWND; msg : WINUSER.MSG; wc : WINUSER.WNDCLASSEX; VAR (* static in WndProc *) hLibrary : WIN32.HINSTANCE; iCurrent : INTEGER = 1; (*********************************************************************) PROCEDURE DrawBitmap (hdc : WIN32.HDC; (*********************************************************************) xStart : INTEGER; yStart : INTEGER; hBitmap : WIN32.HBITMAP); VAR bm : WINGDI.BITMAP; hMemDC : WIN32.HDC; pt : WIN32.POINT; BEGIN hMemDC := WINGDI.CreateCompatibleDC (hdc); WINGDI.SelectObject (hMemDC, SYSTEM.CAST(WIN32.HGDIOBJ,hBitmap)); WINGDI.GetObject (SYSTEM.CAST(WIN32.HGDIOBJ,hBitmap), SIZE (WINGDI.BITMAP), SYSTEM.CAST(WIN32.PSTR,SYSTEM.ADR(bm))); pt.x := bm.bmWidth; pt.y := bm.bmHeight; WINGDI.BitBlt (hdc, xStart, yStart, pt.x, pt.y, hMemDC, 0, 0, WINGDI.SRCCOPY); WINGDI.DeleteDC (hMemDC); END DrawBitmap; <*/PUSH*> %IF WIN32 %THEN <*/CALLS:WIN32SYSTEM*> %ELSE <*/CALLS:WINSYSTEM*> %END (*++++*****************************************************************) PROCEDURE WndProc (hwnd : WIN32.HWND; iMsg : WIN32.UINT; wParam : WIN32.WPARAM; lParam : WIN32.LPARAM) : WIN32.LRESULT [EXPORT]; (**********************************************************************) VAR hdc : WIN32.HDC; ps : WINUSER.PAINTSTRUCT; hBitmap : WIN32.HBITMAP; lpstr : WIN32.LPSTR; BEGIN CASE (iMsg) OF | WINUSER.WM_CREATE : hLibrary := WIN32.LoadLibrary ("BitLib.DLL"); IF (hLibrary = NIL) THEN WINUSER.DestroyWindow (hwnd); END; RETURN 0; | WINUSER.WM_CHAR : IF (hLibrary # NIL) THEN INC(iCurrent); WINUSER.InvalidateRect (hwnd, WINX.NIL_RECT, TRUE); END; RETURN 0; | WINUSER.WM_PAINT : hdc := WINUSER.BeginPaint (hwnd, ps); IF (hLibrary # NIL) THEN lpstr := WINUSER.MAKEINTRESOURCE (iCurrent); hBitmap := WINUSER.LoadBitmap (hLibrary,lpstr^); IF (hBitmap = NIL) THEN iCurrent := 1; hBitmap := WINUSER.LoadBitmap (hLibrary,lpstr^); END; IF (hBitmap # NIL) THEN DrawBitmap (hdc, 0, 0, hBitmap); WINGDI.DeleteObject (SYSTEM.CAST(WIN32.HGDIOBJ,hBitmap)); END; END; WINUSER.EndPaint (hwnd, ps); RETURN 0; | WINUSER.WM_DESTROY : IF (hLibrary # NIL) THEN WIN32.FreeLibrary (hLibrary); END; WINUSER.PostQuitMessage (0); RETURN 0; ELSE RETURN WINUSER.DefWindowProc (hwnd, iMsg, wParam, lParam); END; END WndProc; <*/POP*> (*++++*****************************************************************) PROCEDURE InitApplication () : BOOLEAN; (**********************************************************************) VAR rc : CARDINAL; BEGIN wc.cbSize := SIZE(WINUSER.WNDCLASSEX); wc.style := WINUSER.CS_HREDRAW BOR WINUSER.CS_VREDRAW; wc.lpfnWndProc := WndProc; wc.cbClsExtra := 0; wc.cbWndExtra := 0; wc.hInstance := WINX.Instance; wc.hIcon := WINUSER.LoadIcon (NIL, WINUSER.IDI_APPLICATION^); wc.hCursor := WINUSER.LoadCursor (NIL, WINUSER.IDC_ARROW^); wc.hbrBackground := SYSTEM.CAST(WIN32.HBRUSH, WINGDI.GetStockObject (WINGDI.WHITE_BRUSH)); wc.lpszMenuName := NIL; wc.lpszClassName := SYSTEM.ADR(szAppName); wc.hIconSm := WINUSER.LoadIcon (NIL, WINUSER.IDI_APPLICATION^); rc := WINUSER.RegisterClassEx (wc); RETURN rc #0; END InitApplication; (*++++*****************************************************************) PROCEDURE InitMainWindow () : BOOLEAN; (**********************************************************************) BEGIN hwnd := WINUSER.CreateWindow (szAppName, (* window class name *) "Show Bitmaps from BITLIB (Press Key), Translation to Stony Brook Modula-2", (* window caption *) WINUSER.WS_OVERLAPPEDWINDOW, (* window style *) WINUSER.CW_USEDEFAULT, (* initial x position *) WINUSER.CW_USEDEFAULT, (* initial y position *) WINUSER.CW_USEDEFAULT, (* initial x size *) WINUSER.CW_USEDEFAULT, (* initial y size *) NIL, (* parent window handle *) NIL, (* window menu handle *) WINX.Instance, (* program instance handle *) NIL); (* creation parameters *) IF hwnd = NIL THEN RETURN FALSE; END; WINUSER.ShowWindow (hwnd, WINUSER.SW_SHOWDEFAULT); WINUSER.UpdateWindow (hwnd); RETURN TRUE; END InitMainWindow; (*++++*****************************************************************) BEGIN IF InitApplication() AND InitMainWindow() THEN WHILE (WINUSER.GetMessage(msg,NIL,0,0)) DO WINUSER.TranslateMessage(msg); WINUSER.DispatchMessage(msg); END; END; END ShowBit.