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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> Windows 編程[8] - WM_PAINT 消息

Windows 編程[8] - WM_PAINT 消息

編輯:Delphi

本例效果圖:

Windows 編程[8] - WM_PAINT 消息 

program Project1;

uses
 Windows, Messages;

{供 WM_PAINT 消息調用的自定義過程}
procedure OnPaint(h: HWND);
const
 str = 'CodeGear Delphi 2007';
var
 DC: HDC;
 ps: PAINTSTRUCT;
 Rect: TRect;
begin
 MessageBeep(0);
 DC := BeginPaint(h, ps);
 GetClIEntRect(h, Rect);
 DrawText(DC, PChar(str), -1, Rect, DT_SINGLELINE or DT_CENTER or DT_VCENTER);
 EndPaint(h, ps);
end;

function WndProc(wnd: HWND; msg: UINT; wParam: Integer; lParam: Integer): Integer; stdcall;
begin
 Result := 0;
 case msg of
  WM_PAINT : OnPaint(wnd); {在收到 WM_PAINT 消息時調用自定義的 OnPaint 過程}
  WM_DESTROY: PostQuitMessage(0);
 else
  Result := DefWindowProc(wnd, msg, wParam, lParam);
 end;
end;

function RegMyWndClass: Boolean;
var
 cls: TWndClass;
begin
 cls.style     := CS_HREDRAW or CS_VREDRAW;
 cls.lpfnWndProc  := @WndProc;
 cls.cbClsExtra  := 0;
 cls.cbWndExtra  := 0;
 cls.hInstance   := HInstance;
 cls.hIcon     := 0;
 cls.hCursor    := LoadCursor(0, IDC_ARROW);
 cls.hbrBackground := HBRUSH(COLOR_WINDOW + 1);
 cls.lpszMenuName := nil;
 cls.lpszClassName := 'MyWnd';
 Result := RegisterClass(cls) <> 0;
end;

{程序入口}
const
 tit = 'New Form';
 ws = WS_OVERLAPPEDWINDOW;
 x = 100; y = 100; w = 300; h = 180;
var
 hWnd: THandle;
 Msg : TMsg;
begin
 RegMyWndClass;
 hWnd := CreateWindow('MyWnd', tit, ws, x, y, w, h, 0, 0, HInstance, nil);
 ShowWindow(hWnd, SW_SHOWNORMAL);
 UpdateWindow(hWnd);

 while(GetMessage(Msg, 0, 0, 0)) do
 begin
  TranslateMessage(Msg);
  DispatchMessage(Msg);
 end;
end.


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