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0048_Windows Screen Saver.pas
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Pascal/Delphi Source File
|
1994-11-30
|
3KB
|
135 lines
{
From: bobs@dragons.nest.nl (Bob Swart)
{ here is a very small screensaver. It compiles to less than 3Kbytes: }
{$A+,B-,D-,F+,G+,I-,K-,L-,N-,P-,Q-,R-,S+,T-,V-,W+,X+,Y-}
{$M 8192,0,8192}
program ScrnSave;
{$D SCRNSAVE: Bob Swart}
uses WinTypes,
WinProcs;
function MyYield: Boolean;
var msg: TMsg;
begin
while PeekMessage(msg, 0, 0, 0, PM_REMOVE) do
begin
if msg.message = WM_QUIT then
begin
PostQuitMessage(msg.wParam);
MyYield := TRUE;
EXIT
end
else
begin
TranslateMessage(msg);
DispatchMessage(msg)
end
end;
MyYield := FALSE
end {MyYield};
function DefSaverProc(hwnd: HWND; msg,wp: Word; lp: LongInt): LongInt; export;
Const SC_SCREENSAVE = $F140;
begin
DefSaverProc := 0;
case msg of
WM_CREATE: ShowCursor(FALSE);
WM_DESTROY: begin
ShowCursor(TRUE);
PostQuitMessage(0);
end;
WM_SYSCOMMAND: if wp <> SC_SCREENSAVE then { screen saver starten }
PostMessage(hwnd, WM_CLOSE, 0, 0);
WM_ACTIVATEAPP: if wp = 0 then PostMessage(hwnd, WM_CLOSE, 0, 0);
WM_KEYDOWN,
WM_SYSKEYDOWN,
{ WM_MOUSEMOVE, => I don't like my screensaver to stop on a mousemove }
WM_LBUTTONDOWN,
WM_MBUTTONDOWN,
WM_RBUTTONDOWN: PostMessage(hwnd, WM_CLOSE, 0, 0);
else
DefSaverProc := DefWindowProc(hwnd, msg, wp, lp)
end {case}
end {DefSaverProc};
function WndProc(hwnd: HWND; msg, wp: Word; lp: LongInt): LongInt; export;
var ps: TPaintStruct;
X,Y: Integer;
R,G,B: Byte;
Dc: HDC;
begin
WndProc := 0;
case msg of
WM_PAINT:
begin
beginPaint(hwnd, ps);
endPaint(hwnd, ps);
Dc := GetDC(hwnd);
SetBkMode(Dc,TRANSPARENT);
X := GetSystemMetrics(SM_CXSCREEN);
Y := GetSystemMetrics(SM_CYSCREEN);
while NOT MyYield do
begin
R := Random($FF);
G := Random($FF);
B := Random($FF);
SetTextColor(Dc,RGB(R,G,B));
TextOut(Dc,Random(X),Random(Y),'Bob Swart',9);
end;
releasedc(Dc, hwnd)
end;
else
WndProc := CallWindowProc(@DefSaverProc, hwnd, msg, wp, lp)
end
end {WndProc};
function BlackBox(WndProc: TFARPROC): Integer;
var msg: TMsg;
Const wc: TWndClass=();
begin
wc.style := CS_OWNDC;
wc.lpfnWndProc := WndProc;
wc.hInstance := hInstance;
wc.hbrBackground := GetStockObject(BLACK_BRUSH);
wc.lpszClassName := 'BlackBox';
RegisterClass(wc);
CreateWindow('BlackBox', nil, WS_POPUP+WS_MAXIMIZE+WS_VISIBLE,
0, 0, 0, 0, 0, 0, hInstance, nil);
while GetMessage(msg, 0, 0, 0) do DispatchMessage(msg);
BlackBox := msg.wParam
end {BlackBox};
function Configure: Integer;
begin
Configure :=
MessageBox(HWnd(0),
'Borland Pascal Performance Optimiziation screen saver demo',
'DOS/Win Special 94/4',
mb_OK OR mb_IconInformation)
end {Configure};
begin
if hPrevInst <> 0 then Halt(1);
Randomize;
while ord(CmdLine[0]) <> 0 do
begin
if (CmdLine[0] = '-') OR (CmdLine[0] = '/') then
begin
Inc(CmdLine);
case CmdLine[0] of
's', 'S': blackbox(@WndProc) { activate };
'c', 'C': configure
end
end;
Inc(CmdLine)
end
end.