C / C++ / MFC Discussion Boards

laiju9-Jun-05 4:57

9-Jun-05 4:57

This may be a general doubt but I do need clarification .
I have declared a userdefined class object m_pElement as a member of CMainFrame.
I want to release its memory in the destructor in the foll.manner.

CMainFrame::~CMainFrame()
{
if (m_pElement)
delete m_Element;
}

But if I had not declared memory for pElement using 'new' the above destruction leads to exception.
How to check for allocated memory and then release the memory for pElement.

laiju

Re: ailFreeing memory

Cedric Moonen9-Jun-05 5:05

Cedric Moonen

9-Jun-05 5:05

In the class constructor of CMainFrame, set pointer to NULL:

CMainFrame::CMainFrame()<br />
{<br />
m_pElement = NULL;<br />
}

Like that, in your destructor, if the pointer is NULL, it won't be destroyed.

Re: ailFreeing memory

Budric B.9-Jun-05 5:13

Budric B.

9-Jun-05 5:13

Set m_pElement to NULL in your constructor. Then, the if statement will actually work and the delete will not be executed. And even if it is, it's not a problem to delete a pointer to NULL. In your case however, m_pElement can point to 0x0ccccc (arbitrary) and you're trying to delete it which is not legal.

Read a line from a text file

bkphat9-Jun-05 4:34

bkphat

9-Jun-05 4:34

i am working in MFC VC++ and need to read a specfic line, and only that line from a text file. Is there a readline() function or something like that?

thanks

Re: Read a line from a text file

toxcct9-Jun-05 5:18

toxcct

9-Jun-05 5:18

is std::ifstream::getline() useful ?

cheers,

TOXCCT >>> GEII power
[toxcct][VisualCalc]

Re: Read a line from a text file

James R. Twine9-Jun-05 5:49

James R. Twine

9-Jun-05 5:49

   There is _fgetts(...) function.

   Are you looking for something MFC-specific, like CStdioFile::ReadString(...)...? Or something that uses native Win32 HANDLEs?

   Peace!

-=- James

If you think it costs a lot to do it right, just wait until you find out how much it costs to do it wrong!
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Changing the font of a control ( CStatic )

Maximilien9-Jun-05 4:34

Maximilien

9-Jun-05 4:34

I'm not sure I'm doing the right thing.

I have a CStatic in a dialog ( with the associated variable in the dialog class ), and I want to change the "weight" of the font of the CStatic, make it bold or normal depending on a state.

Can I do something like :

// a user pressed a button to make the CStatic bold...
 CFont* font = m_MaxStatic.GetFont();
 LOGFONT logFont;

 font->GetLogFont( &logFont );
 logFont.lfWeight = FW_BOLD;

 CFont newFont;
 newFont.CreateFontIndirect( &logFont );
 m_MaxStatic.SetFont(&newFont);

when I do the above, the font seems ok, it appears bold, but if the dialogs ( or the control ) gets invalidated, the font (size) is different.

Do I need to make the 2 different fonts (normal and bold) class members ( of either the dialog or a derived CStatic class ) ? or is there a better way to dinamically change the font of a control ?

Should there be a functional difference between small fonts vs. large fonts.

Thanks a lot.

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: Changing the font of a control ( CStatic )

James R. Twine9-Jun-05 4:42

James R. Twine

9-Jun-05 4:42

Maximilien wrote:
CFont newFont;

   You are creating the font correctly. But since it is local to the function, it goes out of scope when the function exits. This means that the font the control is trying to use has been destroyed. So the next time it tries to draw, it no longer has a valid font.

   Make the CFont object a member of the class. That should do it for you.

   Peace!

-=- James

Re: Changing the font of a control ( CStatic )

Maximilien9-Jun-05 5:32

Maximilien

9-Jun-05 5:32

Yeah, thanks, It figures ...

(ranting)
it's kind of weird that I have a CWnd object with the SetFont() method and I need to keep a local copy of the font ... why can't it copy the font instead of keeping a pointer to it.

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: Changing the font of a control ( CStatic )

James R. Twine9-Jun-05 5:45

James R. Twine

9-Jun-05 5:45

   It allows only a single instance of the same font to be used with multiple controls, and you (the developer) maintain its lifetime, so there is no additional allocate-copy-deallocate overhead.

   I would not want to set the font for 20 controls on a non-modal dialog, then open a few copies of that dialog, and have MFC have a bunch of identical copies of a font being managed.

   Peace!

-=- James

Re: Changing the font of a control ( CStatic )

Michael Dunn9-Jun-05 6:55

Michael Dunn

9-Jun-05 6:55

7.2: I'm trying to change the font of a dialog control, but it's not having any effect. Why?[^]

--Mike--
Visual C++ MVP Cool | :cool:

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Re: Changing the font of a control ( CStatic )

Maximilien9-Jun-05 7:04

Maximilien

9-Jun-05 7:04

Thanks for the faq link ...

Sniff | :^)

I will hide under a rock ...

Maximilien Lincourt
Your Head A Splode - Strong Bad

MSVCIRT error

ronwurster9-Jun-05 4:06

ronwurster

9-Jun-05 4:06

I've tried to implement the MATLAB C++ Math Library using Riazi's article posted 28 May 2003. I get a link error 'cannot find the file "MSVCIRT.LIB". I've tried the recommended fix (/nodefaultlib "MVSCRT.LIB" and (/nodefaultlib "MVSCIRT.LIB") which yields more undefined symbols. I've also tried selecting multithreading and still get the error. Any suggestions would be appreciated.

Ron

Re: MSVCIRT error

Blake Miller9-Jun-05 6:29

Blake Miller

9-Jun-05 6:29

If you tell us what some of the undefined symbols are, sometimes we can suggest which library to try linking with. What seems to be missing?

image processing

Arrun9-Jun-05 2:25

Arrun

9-Jun-05 2:25

Hi Everybody,

I am doing a project in image processing using VC++, in which I have to find the intersecting points in a grid.
I tried many corner detection algorithms. Everything works fine with straight lines but not with skewed lines.

Please help me with some algorithm or code

Thanks in advance

Re: image processing

Member 14276929-Jun-05 2:47

Member 1427692

9-Jun-05 2:47

I guess you'll have to take each pixel and verify if it has the same value as at least one from his neighbours.
Something like this:
[ 1 2 3 ]
[ 4 5 6 ]
[ 7 8 9 ]
Now you take pixel #5 and check his value with the ones from that matrix. if it's the same then it is a point of the line(composing the grid), if not then it don't belongs there.
Once you know where the grid lines starts it's easy to identify the intersecting points since you'll know the angle and everything.

Load msword doc files in mfc

GnanaprakashJebaraj9-Jun-05 2:15

GnanaprakashJebaraj

9-Jun-05 2:15

Is it possible to load msword doc and to perform string manipulation.Suppose If we use "Navigate2" we can load the Doc Files,but I was not able to do string manipulation?.Can anyone help out in this.

Thanks,
Gnanaprakash

Re: Load msword doc files in mfc

David Crow9-Jun-05 2:23

David Crow

9-Jun-05 2:23

You need to Google or search MSDN for Word Automation.

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

Re: Load msword doc files in mfc

GnanaprakashJebaraj10-Jun-05 1:30

GnanaprakashJebaraj

10-Jun-05 1:30

David,

Thanks for ur info.Is there any third party controls like CHTMLView.

Re: Load msword doc files in mfc

David Crow10-Jun-05 5:51

David Crow

10-Jun-05 5:51

GnanaprakashJebaraj wrote:
Is there any third party controls like CHTMLView.

Not sure what you mean by "third party" but CHtmlView is part of MFC.

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

Re: Load msword doc files in mfc

ThatsAlok9-Jun-05 18:32

ThatsAlok

9-Jun-05 18:32

Look at this
http://www.mindcracker.com/code/2003/July/WordAddIn.asp[^]

http://www.mindcracker.com/mindcracker/c_cafe/atl/BuildingOffice2KCOMAddInAD.asp[^]

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

cheers,
Alok Gupta

Re: Load msword doc files in mfc

GnanaprakashJebaraj10-Jun-05 1:34

GnanaprakashJebaraj

10-Jun-05 1:34

Alok Gupta,

Thanks for ur info.Is there any third party controls.If we go for Addins we have to port in WinWord.But I need to have in SDI/Dialog.Is there any option.

Thanks,
Gnanaprakash

Re: Load msword doc files in mfc

ThatsAlok10-Jun-05 1:40

ThatsAlok

10-Jun-05 1:40

Microsoft NewsGroup will right place to ask these type of Question Smile | :)

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

cheers,
Alok Gupta

Re: Load msword doc files in mfc

GnanaprakashJebaraj15-Jun-05 20:34

GnanaprakashJebaraj

15-Jun-05 20:34

Thanks for ur info.

www.mindcracker.com/code/2003/July/WordAddIn.asp
I have done all the steps to load Addins in the Word as mentioned in article.I was able to compile code but I couldn't see my addin item button in Word.

Even tried this
Tools -> Customize
Select the Commands Tab
Select Tools in the Categories
Drag the "COM Add-Ins" to a toolbar somewhere.
Click Close.

This article for outlook is working .www.mindcracker.com/mindcracker/c_cafe/atl/BuildingOffice2KCOMAddInAD.asp

How can I see my addin items.Iam using office2000

Thanks,
Gnanaprakash

Parser for C++

Member 14276929-Jun-05 1:01

Member 1427692

9-Jun-05 1:01

I need a parser for C++ that can be integrated in Visual C.
I've tried to make one using yacc and bison but it didn't work(didn't manage to do the file).
Can anyone help me? Do you know where I can find it? Do you have it?
Thank you.

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