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Hi
Make the constructors private, then create a static member function called InitYourObject().
CYourClass * CYourClass::InitYourObject()<br />
{<br />
try<br />
{<br />
CYourClass *object = new CYourClass;<br />
return object;<br />
}<br />
catch(...)<br />
{<br />
return NULL;
}<br />
}
To create an object call
CYourClass *myObject = CYourClass::InitObject();
Hope it helps
Regards
The Best Religion is Science.
Once you understand it, you will know God.
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I avoid putting error handing in the constructor (short of the occasional ASSERT). The constructor is for constructing. If there's a possibility of bad/invalid data, you should either allow the construction to happen and set appropriate conditions in the object to indicate invalid data, or you should validate data BEFORE construction so you can assume that everything is okay at the time of construction. I feel it makes the code much more maintainable (with appropriate and copious code comments of course).
Of course, this is just the way I do it and I'm sure others will want to argue their own approach. You guys have fun with that.
"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001
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I want to implement a username/password authentication system in my MFC/VC++6 application. the idea is to have username/password pairs and previlige level of the user stored encrypted in a file and while authenticating a user get, decrypt and match the info and set previlige level. Plz have any code?
Thanks in advance.
sohail
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How secure does it have to be ? MD5 code is easy to find on the web, you can store MD5 hashes of usernames and passwords, and apply the hash to what the user types in ( rather than have to unencrypt the records in your text file ). This has the advantage that a hash that cannot be reversed is more secure, so long as the hacker doesn't know what the algorithm is.
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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hi,
I'm completely agree. It is the encryption for CISCO Routers for admin or to connect in remote rooters and create a WAN-Path (At least two years ago when I made the CCNAs). You can not uncrypt (at least not very easy) but you can always apply the encryption to whatever the user types and compare both encrypted logins or passwords
--------
M.D.V.
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
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You may use Crypto API, see here [^] for a code sample.
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
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i want code for a editor which is looks like a c editor.
plz send the code. the code is must and should in vc++ only
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ROTFL - that's brilliant.
This site is for asking people to help you, not to make random requests for people to send you complete projects.
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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google
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
Support CRY- Child Relief and You
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Hi
Does anyone know what is the use of having the member function of the = operator has private?
eg Class A
{
A& operator=(const A& a);
public:
void display()
}
what is the use of having A& operator=(const A& a)function has private ?
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To prevent people from using it. For example, if you have a very complex object, or are just too lazy to implement a copy constructor and assignment operator.
Peace!
-=- James Please rate this message - let me know if I helped or not!<HR>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!
Avoid driving a vehicle taller than you and remember that Professional Driver on Closed Course does not mean your Dumb Ass on a Public Road!
See DeleteFXPFiles
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Hi
Do you know how to do exception handling in constructor?
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Yes, I know how to do both catching exceptions in the constructor, and catching them from the calling code that is invoking the constructor.
Peace!
-=- James Please rate this message - let me know if I helped or not!<HR>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!
Avoid driving a vehicle taller than you and remember that Professional Driver on Closed Course does not mean your Dumb Ass on a Public Road!
See DeleteFXPFiles
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... and where is your smile?
--
=====
Arman
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See here.
"A good athlete is the result of a good and worthy opponent." - David Crow
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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hi all
i want to convert wstrint to WCHAR* how to do that?
i am getting following error:
error C2664: 'UnicodeToUtf8' : cannot convert parameter 1 from 'std::wstring *__w64 ' to 'const WCHAR *'
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use the c_str() method of wstring for instance:
std::wstring myWideString = L"FOO";
const WCHAR * pMyWideString = myWideString.c_str();
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
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C_str()
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
Support CRY- Child Relief and You
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How can we hide a column in a list control, an option is to set the column width to zero, but it can be visually identified by maipulating header of zero width column.
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Thanks ![Rose | [Rose]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/rose.gif)
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You're welcome.
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Hi,
I want to define preprocessor constants in command line.
In source it would be something like this:
#define STR_SOMETHING "something"
Now how can I get the same result in command line using /D?
I tried in VS 2005, in Project Property Pages->Configuration Properties-> C/C++->Preprocessor-> Preprocessor Definitions…
Adding STR_SOMETHING=”something” doesn’t work. In Command line it looks like this:
/D "SOMETHING="something"".
The problem is with "".
Any idea how to do this?
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