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Menu items

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Join Date: Mar 2005

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atrusmre

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Menu items

Dec 1st, 2005

I have a MFC application that uses a menu, I want the menu disabled by default (easy enough), but what command do I use to reenable it? I tried

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GetDlgItem(IDM_FILE_TEST)->EnableWindow(TRUE);
GetDlgItem(IDM_FILE_TEST)->EnableWindow(TRUE);

The program runs up until it executes that statement, then it crashes. Any ideas?

Thanx,
Atrus

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Join Date: Jun 2005

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WolfPack

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Re: Menu items

Dec 1st, 2005

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CMenu* menu = GetMenu();
CMenu* submenu = menu->GetSubMenu(0);
submenu->EnableMenuItem(ID_MENUITEM_YOU_WANT_TO_ENABLE, MF_BYCOMMAND | MF_DISABLED | MF_GRAYED);
CMenu* menu = GetMenu();
CMenu* submenu = menu->GetSubMenu(0);
submenu->EnableMenuItem(ID_MENUITEM_YOU_WANT_TO_ENABLE, MF_BYCOMMAND | MF_DISABLED | MF_GRAYED);

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Join Date: Jun 2005

Posts: 1,496

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WolfPack

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Re: Menu items

Dec 1st, 2005

Just for your information, GetDlgItem is used only for the child windows of the mother dialog. The menu is a separate entity. There for

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GetDlgItem(IDM_FILE_TEST)

will return NULL and

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GetDlgItem(IDM_FILE_TEST)->EnableWindow()
GetDlgItem(IDM_FILE_TEST)->EnableWindow()

will fail.

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Join Date: Mar 2005

Posts: 64

Reputation: atrusmre is an unknown quantity at this point

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atrusmre

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Re: Menu items

Dec 1st, 2005

I realized before I posted that that was odviously the wrong thing to use, but it was the closest I could think of. (As a side note, my question was about enabling, and you aswnered how to disable, but I figured it out

And it works) Just a couple of questions. Why the whole CMenu stuff. Why can't you just do?

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EnableMenuItem(ID_MENUITEM_YOU_WANT_TO_ENABLE, MF_BYCOMMAND | MF_DISABLED | MF_GRAYED);

Thanx,
Atrus

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Join Date: Jun 2005

Posts: 1,496

Reputation: WolfPack has a spectacular aura about

Solved Threads: 104

WolfPack

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Mentally Challenged Mod.

Re: Menu items

Dec 1st, 2005

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Originally Posted by atrusmre

(As a side note, my question was about enabling, and you aswnered how to disable, but I figured it out And it works)

Okay. My Bad. I pasted some code I had somewhere so forgot to change it.

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Originally Posted by atrusmre

Why the whole CMenu stuff. Why can't you just do?
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C Syntax (Toggle Plain Text)
 
EnableMenuItem(ID_MENUITEM_YOU_WANT_TO_ENABLE, MF_BYCOMMAND | MF_DISABLED | MF_GRAYED);
EnableMenuItem(ID_MENUITEM_YOU_WANT_TO_ENABLE, MF_BYCOMMAND | MF_DISABLED | MF_GRAYED);

Well it is like this. You can call CWnd::GetDlgItem directly because it is a member function of the CWnd class. So the appropriate function of your dialog window will be called even if you didnt specify the Object you are calling for.

In Contrast, the CMenu::EnableMenuItem function is not a member of the CWnd Class. It is a member of the CMenu Class. To call this inside the Dialog window, you will have to first get the handle for the object of the desired menu item using CWnd::GetMenu(). Actually what you get here is the pointer for the Menubar. Then use the CMenu::GetSubMenu to get the Menu you want and call the CMenu::EnableMenuItem() function.