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I have a function that returns a char* and would like to know which way to handle this as to avoid a leak.
If the function were in this format
char* Function(void)
{
char *szString = new char[50];
return szString;
}
And was called like so:
char *szBuffer = Function();
would deleting szBuffer like so:
delete szBuffer
effectively erase the allocated memory?
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You need to call delete this way
<br />
delete [] szBuffer;<br />
Sonork 100.41263:Anthony_Yio
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I can do it too with delete(szBuffer), right?
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Thanks for the reply but a subquestion. Aren't the brackets supposed to be placed after delete only in case of multidimensional array?
and if not, does this mean I have memory leaks all over my code when I have used new and delete directly? (...oh god no!!!)
eg. char *szString = new char[20]; delete szString
Or does this apply solely because it was returned from a function?
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hmmm, I just realized that ommitting the brackets only delets the first element...I have a lot of search/replacing to do!!!!
Thanks for the help
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Actualy ommitting the brackets does free the memory, but only calls that destructor for the first object in the array. The brackets tells delete to call the destructor of every item in the array. Therefor, for basic types you could get away with not using the brackets (not recommened).
If you are creating an array of objects that also allocate memory for there own use, then you must use the brackets so that there destructors will be called inorder for them to clean up after themselfs (a.k.a. free any memory they allocated).
INTP
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For multidimensional array like below
<br />
int *pSomething = new int [2][2];<br />
the clean up codes will be
<br />
delete [] [] pSomething;<br />
I am not sure if
<br />
char *szString = new char[20]; delete szString<br /> \
[MODIFIED]
will cause a memory leak to your program
[/MODIFIED]
Sonork 100.41263:Anthony_Yio
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Marshall Cline's FAQ is a great resource for looking things up C++
C++ FAQ
"No matter where you go, there your are." - Buckaroo Banzai
-pete
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I CANT PLAY COUNTER STRIKE CUS OF VISUAL C++ :S:S:S:S:S:S
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Congratulations. You are now officially the owner of the most stupid, pathetic, ridiculous, useless, worthless pile-of-crap post on this message board.
Ryan "Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"
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if i start playing counter strike it sas runtime error Visual C++
can anyone help me
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Why not? It seems like it would be the opposite - you can't play visual C++ because of Counter Stike.
/\ |_ E X E GG
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Hi!
I have created a very simple program (a wizard application) with Microsoft Visual C++ .Net 2003. I want to make it stand-alone, ie to create an executable that doesn't need extra DLL.
I notice that my application is linked with mscoree.dll, and imports the CorExitProcess function from ths library.
Before, with Visual C++ 6, with the same compiler options, my executables didn't needed more DLL.
Is there a way to create stand-alone executables with Visual C++ .Net 2003 ? I'm using only MFC.
Thks in advance!
Appstmd
http://www.atlence.com
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I notice that my application is linked with mscoree.dll,
That is because your program uses the .NET framework.
Is there a way to create stand-alone executables with Visual C++ .Net 2003 ? I'm using only MFC.
Start your program as MFC application and use MFC in a static library. Do not use managed extension in your project setting which will add clr(.NET) support to your program.
Sonork 100.41263:Anthony_Yio
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Thanks for your answer. I use MFC in a static library, but how can I disable managed extension in my project? I cannot find it in the project settings dialog.
Thks in advance!
Appstmd
http://www.atlence.com
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In your project properties
General - Project Defaults - Use Managed Extensions
Sonork 100.41263:Anthony_Yio
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This parameter is already set to 'No'. I think it must be a bug in the C++ .Net 2003 compiler...
Thks in advance!
Appstmd
http://www.atlence.com
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It seems that my application runs anyway on a PC that doesn't have the mscoree.dll file.
Thks in advance!
Appstmd
http://www.atlence.com
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Hi,
i'm implementing a tray icon for a cformview mfc sdi app. I want to know which message captures when you press close in the app. (the Cross on the top right part of the program.
I know that the CDialog has the OnCancel, so it closes when you press esc. But it doen't work with cformview .
I tried OnClose, but when i press the X it never goes there. Any ideas?
thanks!
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Why not capture the WM_DESTROY message? That autta work.
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I have 2 GUI applications. One is running on a laptop and is a acting like a data server sending TCP/IP connection based, messages to a client over an Ethernet link. The client program is running on another system. The client loops in Read() and gets the server data. During test, in a lab, the data seems to arrive at the client correctly. But, should I use a checksum to verify that the data is always correct on the client side??? My Ethernet cable may be long...and in a possibly noisey environment in the field. I believe the underlying features of TCP/IP verifys checksum.
Any ideas??
Thanks.
Jerry
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You shouldn't have to. The lower levels of the protocol stack handle data integrity issues. There is nothing stopping you from doing this though.
__________________________________________
a two cent stamp short of going postal.
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I have a dialog box application that I would like to remember some strings that i type in for the next time the program starts... I don't want to just write them to a text file for obvious security problems, i was thinking more like writing them to a string table, but i don't know if i can do that while the program is running rather than while programming it...
Any suggestions will be greatly appreciated and i can give more information if need be.
thx
ix
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First, depending on who you are securing the data from, string tables are no more secure than a text file.
Second, security is a large complex issue, you should read much about it before you begin to assume what is secure.
Third, you cannot write the resources of a file that is currently loaded.
"No matter where you go, there your are." - Buckaroo Banzai
-pete
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