Re: Screen redraw.. - C / C++ / MFC Discussion Boards

JKallen11-Feb-05 11:47

11-Feb-05 11:47

What is the event message when the user clicks the x in the system menu.

Background:

I have disabled OnCancel() and OnOK() so that in my dialog-based app the esc and return keys don't close the app.

I have the OnFileExit (when user selects file exit) method calling EndDialog(IDOK) directly. What function is called when the user clicks on the x?

Long and short of it is I dont want keyboard commands (other than alt navigation) to close the app.

Re: SIMPLE: "x" in System menu

David Crow11-Feb-05 12:18

David Crow

11-Feb-05 12:18

JKallen wrote:
What function is called when the user clicks on the x?

Have you looked at OnClose()?

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Re: SIMPLE: "x" in System menu

JKallen11-Feb-05 13:48

JKallen

11-Feb-05 13:48

Yes. The problem is esc and return call OnOK and OnCancel, so doing anything to OnClose wont change anything.

I think the problem is that clicking the x calls OnCancel (or OnOK doesnt matter which for my purposes).

I need a way to differentiate between hitting the return key and the esc key from clicking the x or selecting file close.

I dont want to get into Virtual Keys right now. Im not at that stage in writing this application yet. I try to write applications in phases. It makes things much simpler when I add functionality in groups.

Re: SIMPLE: "x" in System menu

David Crow12-Feb-05 14:37

David Crow

12-Feb-05 14:37

JKallen wrote:
I need a way to differentiate between hitting the return key and the esc key from clicking the x or selecting file close.

Then implement the following handlers:

OnOK()
OnCancel()
OnClose()
DestroyWindow()

and note when each are called (e.g., breakpoint, message box).

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Re: SIMPLE: "x" in System menu

Shog⁹11-Feb-05 12:25

Shog⁹

11-Feb-05 12:25

The message WM_SYSCOMMAND, with the command id SC_CLOSE. Spy++ is your friend.

However, you would be better off either disabling or hiding the [X] rather than leaving it visible and making it non-functional. This sort of thing is confusing and frustrating to users.

To hide: remove the WS_SYSMENU style from the window.
To disable: retrieve the system menu by calling GetSystemMenu(), then disable and gray the SC_CLOSE option by calling EnableMenuItem().

You should then disable the command (and also the Alt+F4 mnemonic)by intercepting the WM_SYSCOMMAND message and avoiding the default behavior if the command ID is SC_CLOSE.

Shog⁹

I'm not the Jack of Diamonds... I'm not the six of spades.
I don't know what you thought; I'm not your astronaut...

Re: SIMPLE: "x" in System menu

JKallen11-Feb-05 13:54

JKallen

11-Feb-05 13:54

OK That worked. I aggree with respect to irritating users.

What I have done (which works) in case you are interested is

1) disabled the OnOK and OnCancel to address the user hitting the esc and return keys
2) created an event handler to deal with user clicking file exit that calls EndDialog(IDOK)
3) edited the OnSysCommand function so that if SC_CLOSE is the message, it calls EndDialog(IDOK) as well

Exactly the result I was looking for.

Thanks.

Screen redraw..

Neil scsn11-Feb-05 10:29

Neil scsn

11-Feb-05 10:29

HI,
I have an MFC splitter CView screen. When I resize it , by moving the bottom right of the main window, the whole screen gets redraw, and flickers. There are many shapes on the screen , so altering the OnEraseBKnd() is a bit tricky.

I have saw application where, when they resize the screen, an outline is only displayed until it the mouse button is release, then it is redrawing. Does anyone know how to do this?

Regards
Scott

Re: Screen redraw..

Shog⁹11-Feb-05 12:00

Shog⁹

11-Feb-05 12:00

NeilDevlin wrote:
Does anyone know how to do this?

It's not too hard. But it's also a user preference - in Windows display settings, the user is able to choose which method of window resizing they prefer. It is somewhat rude to disregard that. Instead, you should work to eliminate or reduce the flicker in your display. Common techniques include double-buffering, redrawing only the areas uncovered by resizing, and waiting until the user has finished sizing to completely redraw the window.

Shog⁹

I'm not the Jack of Diamonds... I'm not the six of spades.
I don't know what you thought; I'm not your astronaut...

Re: Screen redraw..

Neil scsn11-Feb-05 12:07

Neil scsn

11-Feb-05 12:07

Thanks for the reply.
What i really wish to do is wait until the user has finished sizing before redrawing the window. Basically when the left button is released the window will be redrawing. Also I would like to draw an outline (black frame) of the new window position while being sized.

Any ideas on how to do this?

ps. The application will only be ran on XP/2000, in case it can only be done on these.

Neil

Re: Screen redraw..

Shog⁹11-Feb-05 12:49

Shog⁹

11-Feb-05 12:49

A useful technique is to simply delay resizing the children of your frame for a short while. In an MDI app, subclass your MdiClient window, and in the WM_SIZE handler set a timer for half a second or so. Do not call the base class. In the WM_TIMER handler, set a flag checked by your WM_SIZE handler to let it know that it's time to resize - then send yourself a WM_SIZE message with the appropriate parameters. For an SDI or dialog app, simply do this for your frame or dialog window instead of the MDI client.

The results of this are that the user is still able to view window contents while resizing, yet you are saved from having to deal with repainting quickly in all your child windows.

Shog⁹

I'm not the Jack of Diamonds... I'm not the six of spades.
I don't know what you thought; I'm not your astronaut...

Neural Network Code

bitpusher11-Feb-05 10:21

bitpusher

11-Feb-05 10:21

Hello,

I wish to download my brain to a computer before the end, so to do this, I'd I'll need to start testing and working with some schemes. Are there any MFC resources out there for designing neural networks?

thanks!

JennyP

Re: Neural Network Code

rocky_pulley11-Feb-05 14:13

rocky_pulley

11-Feb-05 14:13

Do you know anything about Neural Networks yet? You have to have a good background in AI (not to mention a lot of math too) to be able to grasp any of the concepts. I don't know why there would be any MFC resources for it, it's not GUI programming.

-- Rocky Dean Pulley

Re: Neural Network Code

bitpusher11-Feb-05 14:30

bitpusher

11-Feb-05 14:30

Thanks for the reply. I'm about 1/3 of the way through the text book "Neural Networks," so I know what I know today, and tomorrow, I'll know more. Smile | :)

I was a little inaccurate when requesting MFC code---I should have said "C++" code. I did program a "brain" about a year ago in C++, but it didn't contain any teaching algorithms. So, this time around, I thought I would try to not reinvent some of the basics (e.g., cell class, etc.).

thanks,

JennyP

Re: Neural Network Code

humps12-Feb-05 0:25

humps

12-Feb-05 0:25

Jenny

If you ever succeed with this, can I have my brain backed up as well ? I can provide a blank DVD.

Thanks,

Neil Humphreys.

Re: Neural Network Code

rocky_pulley12-Feb-05 6:28

rocky_pulley

12-Feb-05 6:28

Yea me too, I'll provide you with a floppy disk. You should have some space left over on it that you can use for something else if you want.

-- Rocky Dean Pulley

Re: Neural Network Code

conniepooh25-Mar-05 19:08

conniepooh

25-Mar-05 19:08

:-Omy hv an assignment to do digit recognition..
but i cat make it run..
coz of header file problem..
may i know how to solve it?
thanks..
i know how to count in multilayer perceptron,but not cant success to make it work..
thanks for answer me..

Re: Neural Network Code

conniepooh25-Mar-05 19:13

conniepooh

25-Mar-05 19:13

sorry for my surprise email u..
do u noe how to do digit recognition by using MLP?
i know all the theory part,but when write in C++,cant run at all..many problem exist..include header file..
thanks for answer me..

Obtaining List of File Names

bitpusher11-Feb-05 10:19

bitpusher

11-Feb-05 10:19

Hello,

I'm working on a project in which the user will click on a directory, and this app will grab all the files in the directory (and all subs), parse their names, and create a new CList.

Are there any helpful MFC code and/or resources gathering the files in the subdirectores?

thanks!

JennyP

Re: Obtaining List of File Names

David Crow11-Feb-05 10:21

David Crow

11-Feb-05 10:21

bitpusher wrote:
Are there any helpful MFC code and/or resources gathering the files in the subdirectores?

Check out the CFileFind class.

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Re: Obtaining List of File Names

bitpusher11-Feb-05 10:27

bitpusher

11-Feb-05 10:27

Perfect! Thanks!

Would you happen to know how to get MP3 information as is built into XP (e.g., encoding rate, etc.)?

thanks!

JennyP

Re: Obtaining List of File Names

David Crow11-Feb-05 12:16

David Crow

11-Feb-05 12:16

I would suggest studying the file format. It's available at www.wotsit.org.

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Re: Obtaining List of File Names

Ravi Bhavnani11-Feb-05 12:51

Ravi Bhavnani

11-Feb-05 12:51

bitpusher wrote:
how to get MP3 information as is built into XP (e.g., encoding rate, etc.)?

See this[^] article.

/ravi

My new year's resolution: 2048 x 1536
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ravib@ravib.com

Can I create split windows dynamically?

bilas11-Feb-05 10:06

bilas

11-Feb-05 10:06

Good time of day!
Smile | :)

Please, help me to solve my little problem
I created split window with two views.

<br />
<br />
BOOL CMainFrame::CreateSplitters(int nRows, int nCols, int m_actRow, int m_actCol, CCreateContext* pContext)<br />
{<br />
	m_bInitSplitter = FALSE;<br />
	my_RightView = RUNTIME_CLASS( CRightHTMLView );<br />
	my_LeftView = RUNTIME_CLASS( CMyTree );<br />
	CRect cr; <br />
	GetClientRect( &cr);<br />
	<br />
	/*<br />
	Than I create two split windows using <br />
	m_wndSplitter.Create( this, 1, 2, CSize(0,0), pContext ); <br />
        */<br />
..        <br />
//In next line I have "Debug Assertion Failed".<br />
if ( !m_wndSplitter.CreateView( 0, 0, my_LeftView, CSize(width/5, cr.Height()), pContext ) || !m_wndSplitter.CreateView( /*0, 1,*/m_actRow, m_actCol, my_RightView, CSize(4*width/5, cr.Height(), pContext ))<br />
{<br />
...<br />
}        <br />
//But when I create static split window, it works good.<br />
...<br />
}<br />
<br />

But I need two create split window dynamically, 'cos later I'll need to destroy it and create another two views (but with gorizontal locating)

Please, help me.

Re: Can I create split windows dynamically?

Bob Ciora11-Feb-05 10:34

Bob Ciora

11-Feb-05 10:34

Why not try splitting the OR into two statements? You may be assuming a boolean short-circuit that isn't occurring. So it's calling CreateView twice, not once.

Bob Ciora

Message System Question

Steve Messer11-Feb-05 9:46

Steve Messer

11-Feb-05 9:46

I need to develop a messaging system for my dialog based appication and wanted some pointers on the approach to take. My need is as follows.

1) The main application would be the central control hub of all messages.
2) Plugins would subscribe to messages that they would like to recieve
   a) keyboard presses
   b) volume up
   c) next ( next song event for media player )
   d) etc.
3) The subscriber could possibly send a response to the recieved message.
4) Everything would be done as a result to a recieved message.
5) The subscriber should not have to scan for messages just get them and either process it
   or ignore it.

Hope that make sense.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.