How can load menu dynamically?

CreateMenu

CreateMenu() creates a new menu and returns the handle.

Syntax

 HMENU WINAPI CreateMenu();

Parameters

None

Return value

Handle to a newly created menu (HMENU).

AppendMenu

Appends a new item to the end of the specified menu bar, drop-down menu, submenu, or shortcut menu. You can use this function to specify the content, appearance, and behavior of the menu item.

Syntax

 BOOL WINAPI AppendMenu(

         HMENU hMenu,

         UINT uFlags,

         UINT_PTR uIDNewItem,

         LPCTSTR lpNewItem

 );

Parameters

hMenu (HMENU) A handle to the menu bar, drop-down menu, submenu, or shortcut menu to be changed.
uFlags (UINT) Controls the appearance and behavior of the new menu item. This parameter can be a combination of the following values. Value Meaning MF_BITMAP, MF_CHECKED, MF_DISABLED, MF_ENABLED, MF_GRAYED, MF_MENUBARBREAK, MF_MENUBREAK, MF_OWNERDRAW, MF_POPUP, MF_SEPARATOR, MF_STRING,MF_UNCHECKED
uIDNewItem (UINT_PTR) The identifier of the new menu item or, if the uFlags parameter is set to MF_POPUP, a handle to the drop-down menu or submenu.
lpNewItem (LPCTSTR) The content of the new menu item. The interpretation of lpNewItem depends on whether the uFlags parameter includes the following values. MF_BITMAP, MF_OWNERDRAW, MF_STRING

Return value

If the function succeeds, the return value is nonzero. If the function fails, the return value is zero/FALSE. To get extended error information, call GetLastError.

 #include <windows.h>

 #define IDM_FILE_NEW 1000

 #define IDM_FILE_OPEN 1001

 #define IDM_FILE_CLOSE 1002

 #define IDM_FILE_EXIT 1003

 #define IDM_HELP_ABOUT 1004

 LRESULT CALLBACK WndProc(HWND hWnd,

                          UINT message, 

                          WPARAM wParam,

                          LPARAM lParam);

 int APIENTRY WinMain(HINSTANCE hInstance,

                      HINSTANCE hPrevInstance,

                      LPSTR     lpCmdLine,

                      int       nCmdShow)

 {

   WNDCLASS wc;

   MSG msg;

   HWND hWnd;

   HMENU hMenu;

   ZeroMemory(&wc, sizeof(WNDCLASS));

   wc.style           = CS_HREDRAW | CS_VREDRAW;

   wc.lpfnWndProc     = (WNDPROC)WndProc;

   wc.hInstance       = hInstance;

   wc.hCursor         = LoadCursor(NULL, IDC_ARROW);

   wc.hbrBackground   = (HBRUSH)(COLOR_BACKGROUND);

   wc.lpszClassName   = (LPCTSTR)"MyDynMenuClass";

   RegisterClass(&wc);

    hWnd = CreateWindow("MyDynMenuClass", "Dynamic Menu", WS_OVERLAPPEDWINDOW,

       CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);

   ShowWindow(hWnd, nCmdShow);

   UpdateWindow(hWnd);

   while (GetMessage(&msg, NULL, 0, 0)) 

   {

     DispatchMessage(&msg);

   }

   return 0;

 }

 HMENU hMainMenu;

 HMENU hFileMenu;

 HMENU hHelpMenu;

 LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)

 {

   int nSel;

   char * caption_menu[] = { "New", "Open", "Close", "Exit", "About"};

   char msg[50];

   switch (message) 

   {

     case WM_CREATE:

     {

       /* Creating our dynamic menu */

       hMainMenu = CreateMenu();

       hFileMenu = CreateMenu();

       hHelpMenu = CreateMenu();

       AppendMenu(hFileMenu, MF_BYPOSITION | MF_STRING, IDM_FILE_NEW, "New");

       AppendMenu(hFileMenu, MF_BYPOSITION | MF_STRING, IDM_FILE_OPEN, "Open");

       AppendMenu(hFileMenu, MF_BYPOSITION | MF_STRING, IDM_FILE_CLOSE, "Close");

       AppendMenu(hFileMenu, MF_BYPOSITION | MF_SEPARATOR, 0, NULL);

       AppendMenu(hFileMenu, MF_BYPOSITION | MF_STRING, IDM_FILE_EXIT, "Exit");

       AppendMenu(hHelpMenu, MF_BYPOSITION | MF_STRING,IDM_HELP_ABOUT, "About");

       AppendMenu(hMainMenu,MF_POPUP | MF_STRING,(UINT)hFileMenu, "File");

       AppendMenu(hMainMenu,MF_POPUP | MF_STRING,(UINT)hHelpMenu, "Help");

       SetMenu(hWnd, hMainMenu);

       break;

     }

     case WM_COMMAND:

     {

       if(wParam >= IDM_FILE_NEW && wParam <= IDM_HELP_ABOUT) {

         sprintf(msg, "Clicked on %s", caption_menu[wParam -IDM_FILE_NEW]);

         MessageBox(hWnd, msg, "Main Menu", MB_OK);

       }

       DefWindowProc(hWnd, message, wParam, lParam);

       break;

     }

     case WM_DESTROY:

     {

       /* Free menu handles */

       DestroyMenu(hHelpMenu);

       DestroyMenu(hFileMenu);

       DestroyMenu(hMainMenu);

       PostQuitMessage(0);

       break;

     }

     default:

       return DefWindowProc(hWnd, message, wParam, lParam);

    }

    return 0;

 }

About our authors: Team EQA

How can load menu dynamically?

CreateMenu

Syntax

Parameters

Return value

AppendMenu

Syntax

Parameters

Return value

Further readings