Re: Open File.... Dimmed

From:
"Alex Blekhman" <xfkt@oohay.moc>
Newsgroups:
microsoft.public.vc.language
Date:
Sat, 25 Nov 2006 11:05:00 +0200
Message-ID:
<ebYyCDHEHHA.4112@TK2MSFTNGP03.phx.gbl>
"Jacky Luk" wrote:

I haven't done much to my application. But when I added
the OnOpenDocument() to it, the menu item "open file..."
was dimmed. When I deleted everything associated with
OnOpenDocument(), the item was suddenly enabled. So does
anyone know what is going on?


You failed to provide appropriate ON_UPDATE_COMMAND_UI
handler. When you provide command handler, you also have to
provide corresponding ON_UPDATE_COMMAND_UI handler.
Otherwise menu item will be disabled. You need to understand
how command and message routing is implemented in MFC. Read
at least these technical notes:

"TN006: Message Maps"
http://msdn2.microsoft.com/en-us/library/0812b0wa(VS.80).aspx

"TN021: Command and Message Routing"
http://msdn2.microsoft.com/en-us/library/xt2c310k(VS.80).aspx

"TN022: Standard Commands Implementation"
http://msdn2.microsoft.com/en-us/library/11861byt(VS.80).aspx

Also, look into MFC's reference for command routing
description:

"Message Handling and Mapping"
http://msdn2.microsoft.com/en-us/library/6d1asasd(VS.80).aspx

Just dedicate half an hour to it and read everything in this
section. Especially pay attention to sections: "How the
Framework Calls a Handler" and "How the Framework Searches
Message Maps".

HTH
Alex

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