本例效果圖:
本例在資源文件中備有兩組菜單, 程序實現運行時切換.
本例使用的資源文件(TestRes.rc):
MyMenu1 MENUEX
BEGIN
MENUITEM "Open" ,101
MENUITEM "Edit" ,102
MENUITEM "Help" ,103
MENUITEM "Chinese" ,104 ,MFT_RIGHTJUSTIFY
END
MyMenu2 MENUEX
BEGIN
MENUITEM "打開" ,201
MENUITEM "編輯" ,202
MENUITEM "幫助" ,203
MENUITEM "English" ,204 ,MFT_RIGHTJUSTIFY
END
本例代碼文件:
program Project1;
{$R 'TestRes.res' 'TestRes.rc'}
uses
Windows, Messages;
{收到 WM_COMMAND 消息時需要做的工作}
procedure OnCommand(h: HWND; wParam: Integer);
var
hm : HMENU;
begin
case wParam of
104,204: begin {104 和 204 是在資源文件中指定的菜單標識}
if LoWord(wParam) = 104 then
hm := LoadMenu(HInstance, 'MyMenu2')
else
hm := LoadMenu(HInstance, 'MyMenu1');
DestroyMenu(GetMenu(h));
SetMenu(h, hm);
DrawMenuBar(h);
end;
end;
end;
function WndProc(wnd: HWND; msg: UINT; wParam: Integer; lParam: Integer): Integer; stdcall;
begin
Result := 0;
case msg of
WM_COMMAND : OnCommand(wnd, wParam); {收到 WM_COMMAND 消息後調用 OnCommand 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 := 'MyMenu1';
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.