Modify message map at run-time - C / C++ / MFC Discussion Boards

12-Nov-02 3:10

Hello I need your expert help. I am trying to make my app to auto hide on start up. Here are part of the code..

CTestDlg.h
----------
I put this on the message map.

afx_msg void OnWindowPosChanging(WINDOWPOS* lpwndpos);

CTestDlg.cpp
------------
I put the following line in BEGIN_MESSAGE_MAP(CTestDlg, CDialog)

ON_WM_WINDOWPOSCHANGING()

And have the following function

void CTestDlg::OnWindowPosChanging (WINDOWPOS* lpwndpos)
{
    CDialog::OnWindowPosChanging(lpwndpos);

    if (lpwndpos->flags & SWP_SHOWWINDOW) {
	lpwndpos->flags &= ~SWP_SHOWWINDOW;
    }
}

It compile without any error but when I run the program the dialog are still visible. Any ideas?

Thank you very much.

Re: Auto hide dialog base app on startup.

567890123412-Nov-02 3:55

5678901234

12-Nov-02 3:55

Try to change flags before call to base class function.

Re: Auto hide dialog base app on startup.

Nitron12-Nov-02 4:08

Nitron

12-Nov-02 4:08

In OnInitDialog try:

if(!this->ShowWindow(SW_HIDE))
{
     <code>//handle the error if there is any</code>
     ...
}

to show it again:

if(!this->ShowWindow(SW_SHOW))
{
     <code>//handle the error if there is any</code>
     ...
}

Nitron
_________________________________________--
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Re: Auto hide dialog base app on startup.

Mazdak12-Nov-02 5:28

Mazdak

12-Nov-02 5:28

This is not very fast solution.

Mazy

"And the carpet needs a haircut, and the spotlight looks like a prison break
And the telephone's out of cigarettes, and the balcony is on the make
And the piano has been drinking, the piano has been drinking...not me...not me-Tom Waits

Re: Auto hide dialog base app on startup.

Nitron12-Nov-02 8:11

Nitron

12-Nov-02 8:11

Mazdak wrote:
This is not very fast solution.

um... Unsure | :~

... ok...

So how do you show/hide a modeless dialog?

A show/hide cycle on my machine took about 12.679709572027 ms over 1000 samples.^* That would be 6.3398547860135 ms to show or hide. I don't know about you, but I'm sure I can't distinguish the difference between 1/158th of a second or 1/200th of a second.

^* Measurements acquired via timer class found here[^].

Nitron
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Re: Auto hide dialog base app on startup.

Mazdak12-Nov-02 9:02

Mazdak

12-Nov-02 9:02

Well for the modeless dialog you have to do that.In slow machines if you do your way,the main dialog or window maybe become visible for a very short time.Thats why I say it is slower.

Mazy

"And the carpet needs a haircut, and the spotlight looks like a prison break
And the telephone's out of cigarettes, and the balcony is on the make
And the piano has been drinking, the piano has been drinking...not me...not me-Tom Waits

A simpler way

Alvaro Mendez12-Nov-02 6:01

Alvaro Mendez

12-Nov-02 6:01

Here's a simpler way:

1. Uncheck the "Visible" checkbox from the dialog resource.
2. Construct the dialog box modelessly:

In your CWinApp-derived class, replace the code in your InitInstance (after Enable3dControlStatic) with something like this:

static CYourDlg dlg;
 
dlg.Create(CYourDlg::IDD);
m_pMainWnd = &dlg;
 
return TRUE;

Regards,
Alvaro

Well done is better than well said. -- Benjamin Franklin

Modify message map at run-time

Hostalet Wandosell12-Nov-02 3:08

Hostalet Wandosell

12-Nov-02 3:08

I am trying to modify the message map at run-time, to create new handles.

Everything lokks fine, but i get this error

Compiler Error C2276 'operator' : illegal address of bound member function expression

when I try to assign the handle function "MaximizeDialog"

AFX_MSGMAP_ENTRY newEntry;
newEntry.nMessage = WM_COMMAND;
newEntry.nCode = CN_COMMAND;
newEntry.nID = (WORD)nID;
newEntry.nLastID = (WORD)nID;
newEntry.nSig = AfxSig_bw;
newEntry.pfn = (AFX_PMSG)(BOOL (AFX_MSG_CALL CCmdTarget::*) (UINT))&MaximizeDialog;

_messageEntries[i] = newEntry;

What can I do ? thanks !

-----
Mit freundlichen Grüssen/Best Regards/Un cordial saludo.

Ing. José Manuel Hostalet Wandosell, Fraunhofer IPA, Abt.323/Robotersysteme
Nobelstrasse 12, D-70569 Stuttgart (Germany)
mailto:jose.hostalet@ipa.fhg.de, http://www.ipa.fhg.de

Re: Modify message map at run-time

Alvaro Mendez12-Nov-02 6:07

Alvaro Mendez

12-Nov-02 6:07

Here's a quick stab at your problem: try removing the "&" from the front of MaximizeDialog.

Regards,
Alvaro

Well done is better than well said. -- Benjamin Franklin

Re: Modify message map at run-time

Hostalet Wandosell13-Nov-02 4:10

Hostalet Wandosell

13-Nov-02 4:10

Thank you !

But I still dont understand, why this '&' is in the definition of windows

#define ON_COMMAND_EX(id, memberFxn)\
	{ WM_COMMAND, CN_COMMAND, (WORD)id, (WORD)id, AfxSig_bw, \
	(AFX_PMSG)(BOOL (AFX_MSG_CALL CCmdTarget::*) (UINT))&memberFxn },

and works when i use the original macro. Confused | :confused:

-----
Mit freundlichen Grüssen/Best Regards/Un cordial saludo.

Ing. José Manuel Hostalet Wandosell, Fraunhofer IPA, Abt.323/Robotersysteme
Nobelstrasse 12, D-70569 Stuttgart (Germany)
mailto:jose.hostalet@ipa.fhg.de, http://www.ipa.fhg.de

Re: Modify message map at run-time

ian mariano12-Nov-02 6:16

ian mariano

12-Nov-02 6:16

MFC hat viele nützliche <<message macros>>, und dieser Artikel kann Ihnen helfen: TN021: Command and Message Routing[^]. Also, TN006: Message Maps[^]

"The greatest danger to humanity is humanity without an open mind."
- Ian Mariano - http://www.ian-space.com/

Help with ClassWizard please!

georgiek5012-Nov-02 2:47

georgiek50

12-Nov-02 2:47

When I loaded up VC++ 6.0 today and went to my resource editor to edit a dialog box in my project, every time I double clicked on a part of it the MFC Class Wizard popped up and told me to add the dialog to a class. I am not using MFC, I have no idea how this setting got turned on and more importantly I don't know how to get rid of it so I can get on with my project. Someone please tell me how to de-activate this feature it is driving me nuts Mad | :mad:

Thanks!

Re: Help with ClassWizard please!

567890123412-Nov-02 4:04

5678901234

12-Nov-02 4:04

Tools - Options - Compatibility - uncheck "Double-click in Dialog editor edits code (MFC only)".

By this way feature is deactivated completely. I really don't know what to do if you want to deactivate it only for non-MFC projects.

Re: Help with ClassWizard please!

georgiek5012-Nov-02 5:56

georgiek50

12-Nov-02 5:56

Thanks a lot, that did the trick.

Flicker and Cwnd

Pyt12-Nov-02 1:58

Pyt

12-Nov-02 1:58

Hi all,

I developped a MDI application that shows a timetable for an appointment system. It basically show staff members and the appointments they are assigned. Each appointment is represented using a derived CWnd object. You get information on appointments by hovering on them using another CWnd derived object.
My problem is that I've got a lot of flicker when i'm dragging appointments or when I hovering on appointments. It really flicker when there's a lot of appointments showing up.
I tried implementing double-buffering but it didn't change anything, any idea?

Pyt

Re: Flicker and Cwnd

Prem Kumar12-Nov-02 2:16

Prem Kumar

12-Nov-02 2:16

Try to show the information by testing for a time lag
of say about 500 ms to 1 sec.

I think windows tooltips are also implemented in this manner

Re: Flicker and Cwnd

KarstenK12-Nov-02 3:01

KarstenK

12-Nov-02 3:01

You can should draw at first to a memory dc and the draw to the screen.

Another solution is to use timers for redrawing.

My experience is also if it doesn´t work, may be there an conceptional mistake.
(Oversized solution)

IMHO: that each appointment is a CWnd seems to be no good idea. I would internally work with an array and access it via the screen coordinates. The output would be simple Retangles. Suspicious | :suss:

Try it @ home. (B&B)

Re: Flicker and Cwnd

Pyt12-Nov-02 3:16

Pyt

12-Nov-02 3:16

Hi,
The thing is that my controls are drawing themselves and that I already implemented a memory dc in the drawing code.
Could the problem be that my view is not actually drawing the controls, but just sending a WM_PAINT message to each of my derived CWnd controls ?

Re: Flicker and Cwnd

KarstenK12-Nov-02 3:22

KarstenK

12-Nov-02 3:22

You´re right. You have understood the principle architecture of the Windows API. Cool | :cool:

My suggestion implies that the area would be drawn by the "containing" window.

Try it @ home. (B&B)

Re: Flicker and Cwnd

Pyt12-Nov-02 3:31

Pyt

12-Nov-02 3:31

Thanks for the info, i'll give it a go.

Pyt

Re: Flicker and Cwnd

Gary Kirkham12-Nov-02 10:51

Gary Kirkham

12-Nov-02 10:51

There is an article here on CP that will help you implement double-buffering

http://www.codeproject.com/gdi/flickerfree.asp

Gary Kirkham

A working Program is one that has only unobserved bugs

Re: Flicker and Cwnd

Patje12-Nov-02 21:42

Patje

12-Nov-02 21:42

By the way, did you know that 'flicker' is dutch 'slang' for a homosexual guy?
Imagine what MS-Word said a few years ago when I typed in a meeting report that one of our applications had a flicker-problem...

(I know this really belongs in the lounge-forum, but I couldn't resist, sorry).

Enjoy life, this is not a rehearsal !!!

vsprintf

Hans Ruck12-Nov-02 1:53

Hans Ruck

12-Nov-02 1:53

Is there a way to find the minimum necessary size for the buffer argument of vsprintf before making the call?

rechi

Re: vsprintf

C^hris L^osinger12-Nov-02 5:10

C^hris L^osinger

12-Nov-02 5:10

sprintf works by calling a the low-level output function (_output) with a stream handle. that same output function handles all printf-style output (printf, sprintf, fprintf, etc). the output function simply outputs to a stream, which can grow as large as necessary.

so... to simulate it... run down the format string, parse it, add up the size of all the output specs. not easy.

-c

A conclusion is simply the place where someone got tired of thinking.

Smaller Animals Software

Re: vsprintf

Tim Smith12-Nov-02 6:20

Tim Smith

12-Nov-02 6:20

Use _vsnprintf and if it returns -1, your buffer is too small.

Tim Smith

I'm going to patent thought. I have yet to see any prior art.

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