{
Copyright (c) 1996 by Charlie Calvert
Modifications by Florian Klaempfl
Standard Windows API application written in Object Pascal.
No VCL code included. This is all done on the Windows API
level.
}
{$APPTYPE GUI}
{$MODE DELPHI}
program WinHello;
uses
Windows;
const
AppName = 'WinHello';
function WindowProc(Window: HWnd; AMessage: UINT; WParam : WPARAM;
LParam: LPARAM): LRESULT; stdcall; export;
var
dc : hdc;
ps : paintstruct;
r : rect;
begin
WindowProc := 0;
case AMessage of
wm_paint:
begin
dc:=BeginPaint(Window,@ps);
GetClientRect(Window,@r);
DrawText(dc,'Hello world by Free Pascal',-1,@r,
DT_SINGLELINE or DT_CENTER or DT_VCENTER);
EndPaint(Window,ps);
Exit;
end;
wm_Destroy:
begin
PostQuitMessage(0);
Exit;
end;
end;
WindowProc := DefWindowProc(Window, AMessage, WParam, LParam);
end;
{ Register the Window Class }
function WinRegister: Boolean;
var
WindowClass: WndClass;
begin
WindowClass.Style := cs_hRedraw or cs_vRedraw;
WindowClass.lpfnWndProc := WndProc(@WindowProc);
WindowClass.cbClsExtra := 0;
WindowClass.cbWndExtra := 0;
WindowClass.hInstance := system.MainInstance;
WindowClass.hIcon := LoadIcon(0, idi_Application);
WindowClass.hCursor := LoadCursor(0, idc_Arrow);
WindowClass.hbrBackground := GetStockObject(WHITE_BRUSH);
WindowClass.lpszMenuName := nil;
WindowClass.lpszClassName := AppName;
Result := RegisterClass(WindowClass) <> 0;
end;
{ Create the Window Class }
function WinCreate: HWnd;
var
hWindow: HWnd;
begin
hWindow := CreateWindow(AppName, 'Hello world program',
ws_OverlappedWindow, cw_UseDefault, cw_UseDefault,
cw_UseDefault, cw_UseDefault, 0, 0, system.MainInstance, nil);
if hWindow <> 0 then begin
ShowWindow(hWindow, CmdShow);
ShowWindow(hWindow, SW_SHOW);
UpdateWindow(hWindow);
end;
Result := hWindow;
end;
var
AMessage: Msg;
hWindow: HWnd;
begin
if not WinRegister then begin
MessageBox(0, 'Register failed', nil, mb_Ok);
Exit;
end;
hWindow := WinCreate;
if longint(hWindow) = 0 then begin
MessageBox(0, 'WinCreate failed', nil, mb_Ok);
Exit;
end;
while GetMessage(@AMessage, 0, 0, 0) do begin
TranslateMessage(AMessage);
DispatchMessage(AMessage);
end;
Halt(AMessage.wParam);
end.