How to Use CMenu to dynamically add pop-up menus and response functions in MFC

Method:
Use the CMenu class in MFC to dynamically add pop-up menus and Response Functions

Steps:

1. Declare a menu:

CMenu menu;

2. Generate a menu object:

Menu. CreatePopupMenu ();

3. Add the following content to the menu:

Menu. AppendMenu (MF_STRING, WM_CLEARHOSTS, "Clear HOSTS ");

For more information about the AppendMenu function, see MSDN. WM_CLEARHOSTS is a custom message, and the last parameter is the text of the menu. Click this menu to call the WM_CLEARHOSTS message processing function.

4. Add a bullet menu:

CMenu submenu;

Submenu. CreatePopupMenu ();

Menu. AppendMenu (MF_POPUP, (UINT_PTR) (submenu. m_hMenu), "sub ");

5. The menu disappears automatically when the focus is lost.

SetForegroundWindow ();

6. Set the menu position:

Menu. TrackPopupMenu ();

The above steps are a complete step for dynamically generating menus. When there are many dynamically generated menus and the menus are not fixed

It is difficult and unrealistic to define a message and message processing function for each menu. Now we will introduce a method to dynamically respond to dynamically generated menus.

The principle is to use the OnCommand function.

First, you must specify an ID for each dynamically generated menu.

Menu. AppendMenu (MF_STRING, ID, "yourMenuName ");

The parameter ID is a unique integer that can be specified by you. When you click this menu, the system sends a message, which takes priority.

Received by the OnCommand function. The original form of the OnCommand function is:

BOOL OnCommand (WPARAM wParam, LPARAM lParam );

If you specify the menu ID as 10001, the response function is written as follows:

BOOL OnCommand (WPARAM wParam, LPARAM lParam)

{
Int menuID = LOWORD (wParam );
If (menuID & gt; 10000)
{
// Add your own processing code
}
}