Windows 编程[7]

zz775520666

本次我把生成窗口的过程做了简化, 以凸现新注入的代码; 本例效果图:




program Project1;
uses
Windows, Messages;
function WndProc(wnd: HWND; msg: UINT; wParam: Integer; lParam: Integer): Integer; stdcall;
begin
Result := 0;
case msg of
WM_CREATE : MessageBeep(48);    {在收到 WM_CREATE 消息时发出一个声音}
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.