- 6.5. -
Table of Contents
6. Win32 Programming
6.5. Example of Win32 GUI Application
6.5. Example of Win32 GUI
Application
program HelloW;
{$ifndef __WIN32__}
{$define INVALID_TARGET}
{$endif}
{$ifndef __GUI__}
{$define INVALID_TARGET}
{$endif}
{$ifdef INVALID_TARGET}
This program must be compiled for Win32 GUI target only
{$endif}
uses
Windows, MMSystem, Messages;
function MyWndProc conv arg_stdcall
(Window: HWND;
Mess: UINT;
Wp: WParam;
Lp: LParam): LRESULT;
begin
case Mess of
WM_PAINT: begin
declare
var
DC: hDC;
ps: TPaintStruct;
begin
DC := BeginPaint(Window, ps);
TextOut(DC, 0, 0, 'Hello World!', 12);
EndPaint(Window, ps);
Result := 0;
end;
end;
WM_DESTROY: begin
PostQuitMessage(0);
Result := 0;
end;
WM_LBUTTONDOWN: begin
MessageBox(Window, 'This is my message!',
'My message box', MB_OK);
Result := 0;
end;
else
Result := DefWindowProc(Window, Mess, Wp, Lp);
end;
end;
var
wc : TWndClass;
wnd: HWnd;
Msg: TMsg;
begin
FillChar(wc, SizeOf(wc), 0);
with wc do begin
style:=CS_HREDRAW + CS_VREDRAW;
lpfnWndProc := @MyWndProc;
cbClsExtra := 0;
cbWndExtra := 0;
hInstance := System.hInstance;
hIcon := LoadIcon(THandle(NIL), IDI_APPLICATION);
hCursor := LoadCursor(THandle(NIL), IDC_ARROW);
hbrBackGround := COLOR_WINDOW+1;
lpszMenuName := nil;
lpszClassName := 'HelloWorld';
end;
if RegisterClass(wc) = 0 then begin
Exit;
end;
wnd := CreateWindow(wc.lpszClassName,
'GUI Application Demo',
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,
0,
CW_USEDEFAULT,
0, 0, 0,
HInstance,
NIL);
ShowWindow(wnd, SW_RESTORE);
UpdateWindow(wnd);
while GetMessage(Msg,0,0,0) do begin
TranslateMessage(Msg);
DispatchMessage(Msg);
end;
end.
- 6.5. -
