Using CList and collections properly? - C / C++ / MFC Discussion Boards

Kelly Herald31-Dec-03 17:28

31-Dec-03 17:28

Your CFont object needs to be moved to the header file of your dialog class.

What's happening is that the CFont object is being created on the stack within your function and when the function exits the CFont object goes out of scope and it's destructor is being called.

shultas wrote:
Also: I am wondering if there is a way to set the default font for the dialog buttons or set the font / size for the button text with the resource editor (instead of having to have code to "change" the font of the button) ?

This would be a nice feature. Microsoft, are you listening?

Kelly Herald
Software Developer
MPC

Re: Using SetFont() on a button control

Rajesh match31-Dec-03 19:56

Rajesh match

31-Dec-03 19:56

LOGFONT logFont;

logFont.lfHeight = 12;
logFont.lfWidth = 0;
logFont.lfWeight = FW_BOLD;
logFont.lfItalic = FALSE;
logFont.lfUnderline = FALSE;
logFont.lfStrikeOut = FALSE;
logFont.lfEscapement = 0;
logFont.lfOrientation = 0;
lstrcpy(logFont.lfFaceName, _T("Arial"));

m_font.CreateFontIndirect(&logFont); // Create the font.
GetDlgItem(IDC_BUTTON)->SetFont(&m_font);
Declare CFont in .h file

Re: Using SetFont() on a button control

shultas1-Jan-04 9:57

shultas

1-Jan-04 9:57

When I put the declaration of Cfont on the .h file, it whined saying that multiple definitions were found (probably because that .h file is included in several places). (I did not put it in the class declaration, but after the class declaration).

But, what I did is right up top in my .c file where the <include> statements were, I put Cfont ListBoxFont; in there and it worked perfectly Big Grin | :-D

Thanks for the tips!

Re: Using SetFont() on a button control

J.B.1-Jan-04 18:10

J.B.

1-Jan-04 18:10

shultas wrote:
When I put the declaration of Cfont on the .h file, it whined saying that multiple definitions were found (probably because that .h file is included in several places). (I did not put it in the class declaration, but after the class declaration).

Try to put the CFont declaration in the class scope, as a class member.

shultas wrote:
But, what I did is right up top in my .c file where the statements were, I put Cfont ListBoxFont; in there and it worked perfectly

That has essentially the same effect I believe. Since here it's been declared as a global variable, the CFont still exists after exiting OnInitDialog()

Intercepting Mouse Clicks

__Cerb31-Dec-03 10:06

__Cerb

31-Dec-03 10:06

Is there a way to intercept mouse clicks when the current window is minimized or inactive?

Thanks

~Mike

Re: Intercepting Mouse Clicks

alex.barylski31-Dec-03 10:17

alex.barylski

31-Dec-03 10:17

When ou click on a window, it will become active and you'll recieve your mouse messages.

when you window is minimized, you want to capture mouse clicks inside another window?

Probably best to look into hooks Smile | :)

HTH

Cheers

The word of the day is legs, let's go back to my house and spread the word Poke tongue | ;-P

Re: Intercepting Mouse Clicks

__Cerb31-Dec-03 10:26

__Cerb

31-Dec-03 10:26

Yes, actually I want to intercept every mouse click once the "Start" button of my program is clicked... can you help me?

Using CList and collections properly?

Cloaca31-Dec-03 9:01

Cloaca

31-Dec-03 9:01

Hello everyone,

I have been working on an MFC SDI program whose Document actually has lists of lists (and possibly a list of a list of a list). I would like to get into a good habit and be consistent with the way I maintain collections (mostly lists, occasionally arrays and maps). Almost all my objects are derived from CObject (for serializing, etc.).

I guess it comes down to picking between CList<type, type>, CList<type, type&>, CList<type*, type*> and whatever other combinations. To keep sane, I think I always want to use CList<type*, type*>. That way, I just use the new operator at the point where an object needs to be instantiated and call delete on it (while traversing the list or sublist) at the 'outer' list's destructor.

I would like comments about this. Is it safe? Is it a decent practice to keep? How can I prevent double deleting the same objects (if that could even happen)? Does this choice affect how I code the required copy constructor and assignment operator (which always seem to involve references)?

Thanks in advance for any advice and comments!
Happy New Year, Smile | :)

Eric

Re: Using CList and collections properly?

Cloaca5-Jan-04 4:21

Cloaca

5-Jan-04 4:21

Is this the proper forum to ask this question, or should I move it elsewhere?

Thanks,
Eric

NMAKE, Implicit Rules and unknown file types

Bryan Anslow31-Dec-03 8:06

Bryan Anslow

31-Dec-03 8:06

Using NMAKE (the VC++6 version) and a makefile, I can easily write implcit rules to compile *.c *.cpp and *.asm files.

However, if I write an implicit rule to compile an *.a39 file, I always get an error;

NMAKE : fatal error U1073: don't know how to make 'D:\v400\bld\obj\testprg.o'

It seems that if it is not a "normal" filetype then NMAKE will not find it.

Is there any way around this (apart from renaming my files)?

Thanks,

Bryan.

DAO in SDK app (supports MFC)

Jay231-Dec-03 6:19

Jay2

31-Dec-03 6:19

Hi

When closing access database file objects in c++ I keep getting this error:- Debug Assertion Failed.
It happens as I close the CDaoDatabase object but I have noticed that when it is debugged and stepped over there are no errors.

Why doesn't this work?

CDaoDatabase    db;<br />
db.Open( _T("c:\\database.mdb") );<br />
db.Close();

Also are there any good examples of using the MS Jet Engine including V4 if pos.

Many thanks

Jason

Re: DAO in SDK app (supports MFC)

Selvam R1-Jan-04 19:21

Selvam R

1-Jan-04 19:21

Hello,

I think this article helps to you.

http://funducode.com/freevc/database/database2.htm

With Regards,
R.Selvam

Compare sign of numbers in C++

Gagnon Claude31-Dec-03 6:19

Gagnon Claude

31-Dec-03 6:19

Hi,

How can we compare sign of numbers in C++ ?

Bye,
Claude

Re: Compare sign of numbers in C++

Dominik Reichl31-Dec-03 6:59

Dominik Reichl

31-Dec-03 6:59

int i = -5; // int is assumed to be 32 bits
BOOL bNegativeNumber = i >> 31;
ASSERT(bNegativeNumber == TRUE);
...
short sh = 4;
BOOL bNegative16 = sh >> 15;
ASSERT(sh == FALSE);

Hope you meant that Big Grin | :-D

Dominik

_outp(0x64, 0xAD);
and
__asm mov al, 0xAD __asm out 0x64, al
do the same... but what do they do??
(doesn't work on NT)

Re: Compare sign of numbers in C++

Stefan Pedersen1-Jan-04 7:00

Stefan Pedersen

1-Jan-04 7:00

I hope you are joking... the size of integers are only specified in realtive form (i.e. sizeof(char) <= sizeof(int) and so on).
Bitshifting based on static numbers are bound to fail.
Use comparisons instead (as in the post below).

And if the paths that I have followed/have tread against the flow/there is no need for sorrow
I am coming home
Return, Crüxshadows

Re: Compare sign of numbers in C++

Tim Smith31-Dec-03 10:41

Tim Smith

31-Dec-03 10:41

int a = 145;
int b = -51;

bool fIsDifferent = (a >= 0) ^ (b >= 0);

Tim Smith

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

Resizing controls in MFC

Rafael Fernández López31-Dec-03 5:43

Rafael Fernández López

31-Dec-03 5:43

Hi !!

My app is being developed in MFC, VC++7. How can I make my controls resizable ?? I mean, when an user clicks on the corner to make the window bigger or smaller... please if the piece of code could be provided it would be great!!

Thank you very much !!

Written by: Rafael Fernández López.

void life ( bool me, bool her )
{

if ( her )
{
me = true ;
}
else
{
me = false ;
}

}

Re: Resizing controls in MFC

Michael Dunn31-Dec-03 7:30

Michael Dunn

31-Dec-03 7:30

There are several here on CP, search for "layout manager" or "resize manager"

--Mike--
Ericahist | CP SearchBar v2.0.2 | Homepage | 1ClickPicGrabber New v2.0! | RightClick-Encrypt
Laugh it up, fuzzball.

Change the selection style of a listbox on the fly

shultas31-Dec-03 4:44

shultas

31-Dec-03 4:44

Hello everyone.

I have built a program with a listbox on the main dialog. I desire to use this listbox for multiple purposes, sometimes allowing the user to select an item out of it, othertimes not allowing them to select anything. What I am wondering, is it possible to have code within the program that changes the "selection" property of the listbox from "Single" to "None"?

Thanks!

Re: Change the selection style of a listbox on the fly

valikac31-Dec-03 5:31

valikac

31-Dec-03 5:31

One solution is to derive a class from CListCtrl and do custom selection. Otherwise, one possible solution is to intercept the mouse click.

Kuphryn

Re: Change the selection style of a listbox on the fly

Michael Dunn31-Dec-03 7:34

Michael Dunn

31-Dec-03 7:34

Sure, the selection type is determined by the listbox styles LBS_NOSEL and LBS_MULTIPLESEL so you'd just toggle on/off the style bits as appropriate.

--Mike--
Ericahist | CP SearchBar v2.0.2 | Homepage | 1ClickPicGrabber New v2.0! | RightClick-Encrypt
If my rhyme was a drug, I'd sell it by the gram.

Re: Change the selection style of a listbox on the fly

shultas31-Dec-03 11:11

shultas

31-Dec-03 11:11

(I'm new at VC++). I've been looking for an hour on how to do this. I am wondering could you give me an example of how I would do this? (I tried looking for things such as m_ListBox.SetStyle() but could not find anything?)

Thanks for the reply I do appreciate it!

Re: Change the selection style of a listbox on the fly

Ravi Bhavnani31-Dec-03 19:40

Ravi Bhavnani

31-Dec-03 19:40

See CWnd::GetStyle() and ::SetWindowLong() to dynamically change a control's style.

/ravi

Let's put "civil" back in "civilization"
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ravib@ravib.com

Re: Change the selection style of a listbox on the fly

Michael Dunn31-Dec-03 20:16

Michael Dunn

31-Dec-03 20:16

Close, CWnd::ModifyStyle() is the function to use (assuming you're using MFC which it looks like you are)

// Change to no selection
m_ListBox.ModifyStyle ( LBS_MULTIPLESEL | LBS_NOSEL, LBS_NOSEL );
// Change to multiple selection
m_ListBox.ModifyStyle ( LBS_MULTIPLESEL | LBS_NOSEL, LBS_MULTIPLESEL );
// Change to single selection
m_ListBox.ModifyStyle ( LBS_MULTIPLESEL | LBS_NOSEL, 0 );

--Mike--
Ericahist | CP SearchBar v2.0.2 | Homepage | 1ClickPicGrabber New v2.0! | RightClick-Encrypt
Pinky, are you pondering what I'm pondering?
I think so Brain, but if we shaved our heads, we'd look like weasels!

Change Background color of a word in CRichEditCtrl control

BazM31-Dec-03 3:08

BazM

31-Dec-03 3:08

Hi,

Can anyone please give me a clue about changing the background color of a word in a CRichEditCtrl control?

I've seen the documentation on Rich Edit 2.0 (whereever that lives!) and CHARFORMAT2 but whenever I try it the background color remains unchanged.

BazM

Confused | :confused:

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