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Windows 编程[17] - 更换菜单: LoadMenu、DestroyMenu、SetMenu本例效果图:
本例在资源文件中备有两组菜单, 程序实现运行时切换.
本例使用的资源文件(TestRes.rc):MyMenu1 MENUEXBEGIN MENUITEM "Open" ,101 MENUITEM "Edit" ,102 MENUITEM "Help" ,103 MENUITEM "Chinese" ,104 ,MFT_RIGHTJUSTIFYEND
MyMenu2 MENUEXBEGIN MENUITEM "打开" ,201 MENUITEM "编辑" ,202 MENUITEM "帮助" ,203 MENUITEM "English" ,204 ,MFT_RIGHTJUSTIFYEND
本例代码文件:program Project1;
{$R 'TestRes.res' 'TestRes.rc'}
uses Windows, Messages;
{收到 WM_COMMAND 消息时需要做的工作}procedure OnCommand(h: HWND; wParam: Integer);var hm : HMENU;begin case wParam of 104,204: begin {104 和 204 是在资源文件中指定的菜单标识} 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 消息后调用 OnCommand 过程} 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.
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