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Todd what do you mean by your number 3.
3. You can optionally stop rendering while the user drags the window. This is usually desirable anyways. If you want to drag with the image then consider buffering the image yourself with glcopypixels or something similar. Then do a blit while you drag instead of a render. That works well for CAD style apps where rendering may not be real-time.
I am not understanding it.
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Hi,
I am writing an MFC application which has a menu called IDR_MAINFRAME. Now in the menu I have a menu item File>Listen (ID_FILE_LISTEN).
I want the message handler for this menu item in the view class of my application (CUDPView). So I used the Class Wizard to add the message handler, and it created the following function in the CUDPView.cpp file:
void CUDPView::OnFileListen()
{
// TODO: Add your command handler code here
AfxMessageBox("Ok Code Reachable"); // added by me
}
I added the AfxMessageBox line in the code to see if this function was indeed called when I clicked File>Listen, but it was not called!
Tell me please, what's wrong?
Mike 
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No I dont have any message hanlders anywhere else. Is that necessary? If yes then tell me what I should do?
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No, it's not necessary, but other handlers may be invoked first.
Did you override OnCmdMsg in any class?
Tomasz Sowinski -- http://www.shooltz.com
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Nope! I did on override OnCmdMsg anywhere....I haven't over ridden any functions!
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Well I know, it is all my fault. I haven't really understood how to add a message handler for a menu bar item. I just created an empty MFC project and then added a new menu item (ID_FILE_SOMEITEM).
Then through the Class Wizard on Mesage Maps tab I chose the view class CMyAppView and chose ID_FILE_SOMEITEM in ObjectIDs and then clicked on Command in Messages and clicked the Add Function button.
The class wizard created the function OnFileListen.
I added the same AfxMessageBox("Code Reachable"); line inside the function and when I built the project.....I was expecting it to give me a message box alert on clicking File>SomeItem
But Nothing Happens. Evidently I am making a pretty basic mistake in creation of message handlers.
Tell me what to correct.
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I think you've performed the necessary steps. Is the menu item enabled or it remains grayed?
Tomasz Sowinski -- http://www.shooltz.com
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Ofcourse it is enabled!!!!
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Go into the class wizard for the view class, click on the ID_FILELISTEN item and then tell me if COMMAND or UPDATE_COMMAND_UI is in bold ?
Christian
After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001
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Yes COMMAND is in bold...with the Member function
OnFileListen (ON_ID_FILE_LISTEN:COMMAND)
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Then there is no reason in the world for it not to work. Have you done any manual editing to the files in the command handler area EVER ? Because if you have, it's possible you've confused the Class Wizard. What references to ID_FILE_LISTEN are there in the .h and .cpp file ?
Oh, it's generally good not to ask the same question over and over, especially when two people are already helping you.
Christian
After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001
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I am sorry, but this is really annoying. Apparently I've done everything right.
I had to implement it in a real project, but since it was creating complications, I tried this on an empty (new) project.
I just created a new project, added an item to the menu bar, then used the Class wizard to create a message handling function. Inside the function that the Class wizard created, I just added one line
AfxMessageBox("Code Reachable");
That's it!
But it just does not seem to work!
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I understand what you've done, I want to know if you search all files for the ID_FILE_LISTEN, what comes up. You should have al ine like this in the header:
afx_msg void OnFileListen();
and in your .cpp file
BEGIN_MESSAGE_MAP(CMyView, CView)
ON_COMMAND(ID_FILE_LISTEN, OnFileListen)
END_MESSAGE_MAP()
These are what links the message to the command, are they there ?
As to being frustrated, I can appreciate that, but I'm right here trying to help, and Tomasz also seems to be online, so there is no reason to keep asking while you wait for our replies, it only clogs up the forum with the same question over and over. If I ask a question and don't get an answer, I usually wait at least a day to ask again.
Christian
After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001
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Ok I searched all the files for ID_FILE_LISTEN
Here is what I got
Searching for 'ID_FILE_LISTEN'...
C:\Sockets Programming\111\111.rc(82): MENUITEM "Listen Port", ID_FILE_LISTEN
C:\Sockets Programming\111\111View.cpp(23): ON_COMMAND(ID_FILE_LISTEN, OnFileListen)
C:\Sockets Programming\111\resource.h(5):#define ID_FILE_LISTEN 0
3 occurrence(s) have been found.
Then I searched all the files for OnFileListen and here is what I got
Searching for 'OnFileListen'...
C:\Sockets Programming\111\111View.cpp(23): ON_COMMAND(ID_FILE_LISTEN, OnFileListen)
C:\Sockets Programming\111\111View.cpp(105):void CMy111View::OnFileListen()
C:\Sockets Programming\111\111View.h(51): afx_msg void OnFileListen();
3 occurrence(s) have been found.
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I think I may have it. Is your app an MDI application ? Because if it is, you need to click File:New in order to have an instance of your view class to execute.
Have you tried putting a breakpoint in your message handler and tracing to see if it somehow gets there but fails to show a dialog ?
Apart from that, I'd be overriding WM_COMMAND and doing something like this
if (LOWORD(wParam)== ID_FILE_LISTEN)
{
AfxMessageBox("You clicked ID_FILE_LISTEN");
}
I'd also try adding the handler to the CMainFrame class, or adding them for other handlers not in the ID_FILE_ domain, just to try and narrow down where it's going wrong.
Christian
After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001
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I think I know the problem.
Change the menu ID to something nonzero (in C:\Sockets Programming\111\resource.h(5))
#define ID_FILE_LISTEN 32771
Hope this helps.
// Fazlul
Get RadVC today! Play RAD in VC++
http://www.capitolsoft.com
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How do you know my project is in c:\Sockets Programming\111???
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Because you posted it when you posted the results of your search.
He's right, I should have looked closer at the post, but I wasn't thinking along those lines.
Christian
After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001
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How can i detect and count two blank circles on a bitmap?
My project is to mark quiz MCQs.
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What form do your bitmaps take - have they been scanned ? What does MCQ stand for ?
Christian
After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001
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MCQ = Multiple Choice Questions 
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I'm in the process of developing an application that has two dialog windows open at one time.
I would like to update both of these windows every x seconds, but can only seem to do this when the user clicks a button.
Any idea on how I might get this to update without intervention from the user?
Later I'm going to add in a socket and get data from there to update the windows.
Thanks for any help
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