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Hello,
How can i access class member variable directly without creating object of that class.
I think there are two way, one way is declaring member variable as static.
What is the other way to access it?Abhijit
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Abhijit D. Babar wrote: I think there are two way, one way is declaring member variable as static.
What is the other way to access it?
There isn't another way.
 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.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
[My articles]
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learn about the class concept. A member makes only sence if have an instance. 
if it is a global values (as computer name) use a static variable.Press F1 for help or google it.
Greetings from Germany
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Hello,
Why MFC application create two resource file ".rc" and ".rc2" or What is the difference between .rc and .rc2 files.
.rc2 file does not contain anything, then why it use or created by MFC.Abhijit
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In the *.rc2 file it is said:
#ifdef APSTUDIO_INVOKED
#error this file is not editable by Microsoft Visual C++
#endif //APSTUDIO_INVOKED
Regards.
--------
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?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpfull answers is nice, but saying thanks can be even nicer.
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Ok, it is having something in file, but what is use of that.
What it indicates.Abhijit
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Take a look on documentation[^]Regards.
--------
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?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpfull answers is nice, but saying thanks can be even nicer.
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| you can include resources, which will not be editable in the Resource editor of the VS. Interesting for constant stuff as error messages or data as images. Press F1 for help or google it.
Greetings from Germany
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Hello,
In my MFC application, i added one Dialog resource and give class name as CSample.
I can invoke this dialog through;
CSample obj;
obj.DoModal();
Can i create user defined constructor for dialog class CSample.
If i want to pass some parameter to this class through constructor, can i pass it?Abhijit
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Yes, you can. Just declare the type in the header file and add the definition in the cpp file.
I wonder why haven't you tried?!
“Follow your bliss.” – Joseph Campbell
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I just want to pass the parameter for dialog class before dialog get invoke.
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Abhijit D. Babar wrote: I just want to pass the parameter for dialog class before dialog get invoke.
Go ahead.
“Follow your bliss.” – Joseph Campbell
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Abhijit D. Babar wrote:
Can i create user defined constructor for dialog class CSample.
Yes.
Abhijit D. Babar wrote: If i want to pass some parameter to this class through constructor, can i pass it?
Yes.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.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
[My articles]
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Yes, you can create user defined constructor, and yes, you can pass parameters through the constructor to the dialog, but as the CDialog already gets a CWnd* as constructor parameter, NULL if nothing else is said.
CSample (CWnd* pParent = NULL);
I would use Set/Get methodes to pass parameters, because if you overload the constructor parameters, it may be that the MFC (if you use it) gives you problems if you have an error overloading the constructor. After just use the contructor to initialize the member variables/pointers
I mean:
CSample obj;
obj.SetParam1(value1);
obj.SetParam2(value2);
...
obj.DoModal ();
So you are passing the parameters before it gets invoked as you said in an answer to RajeshRegards.
--------
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?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpfull answers is nice, but saying thanks can be even nicer.
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Nelek wrote: I would use Set/Get methodes to pass parameters, because if you overload the constructor parameters, it may be that the MFC (if you use it) gives you problems if you have an error overloading the constructor. After just use the contructor to initialize the member variables/pointers
Well, it looks to me a super-defensive approach.
[added]
Actually, I suppose I didn't get you. You are right, error handling in class constructor is troublesome. 
[/added]
 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.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
[My articles]
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Thanks Regards.
--------
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?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpfull answers is nice, but saying thanks can be even nicer.
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Hello,
I want to know datatype for "this" pointer in C++.
Can you explain with small example.Abhijit
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There are two ways to look at it:
1. this is a pointer and all pointers are of type ptrdiff_t.
2. Since this is defined for a particular class, its type is the pointer to that class.
-Saurabh
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| Your #2 is right. I'm afraid you fell asleep while typing your #1. ptrdiff_t is the type for the difference between 2 pointers. No pointers are themselves of type ptrdiff_t. Please do not read this signature.
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Yes any pointer except class-function-pointers can be saved in prtdiff_t type. It is 32-bits on 32-bit machine and 64-bit on 64-bit machine. Don't let them diff in type confuse you. Check the following articles.
About size_t and ptrdiff_t[^]
http://www.viva64.com/terminology/ptrdiff_t.html[^]
If you don't believe them then here are the definitions from crtdefs file:
#ifndef _INTPTR_T_DEFINED
#ifdef _WIN64
typedef __int64 intptr_t;
#else
typedef _W64 int intptr_t;
#endif
#define _INTPTR_T_DEFINED
#endif
#ifndef _PTRDIFF_T_DEFINED
#ifdef _WIN64
typedef __int64 ptrdiff_t;
#else
typedef _W64 int ptrdiff_t;
#endif
#define _PTRDIFF_T_DEFINED
#endif
As you can see, intptr_t and ptrdiff_t are defined identically.
-Saurabh
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Well that's three people who got it wrong. ptrdiff_t is an integral value used to store the difference between two pointers. While you can store a pointer (by casting) in such a variable that is not the same as saying that the datatype of this is ptrdiff_t. The datatype of this is always pointer to the instance of the class in which it is used.txtspeak is the realm of 9 year old children, not developers. Christian Graus
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 Richard, being one of the three posts leading up to yours ( and having gotten a 1 vote ) are you saying that I got it wrong? If so, I don't understand as we were both saying the same thing. Specifically:
ptrdiff_t is the type for the difference between 2 pointers. No pointers are themselves of type ptrdiff_t.
and refering to Saurabh's post
this ... , its type is the pointer to that class.Please do not read this signature.
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| Sorry no, I was not challenging your comments, with which I obviously agree; nor did I 1-vote you. I was alluding to the comments in Saurabh's post (and the linked articles) that there was not much difference between pointers and ptrdiff_t types. txtspeak is the realm of 9 year old children, not developers. Christian Graus
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| I didn't think you were the 1-voter, but I was puzzled by who the "3 people" were. I didn't think of the 2 links. BTW, the two links are evidently 1 person. The article linked to on CP also appears on the business website linked to. Please do not read this signature.
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It's type is a pointer to the class in which you are using it. Suppose you are using the this keyword inside a method of the CMyClass class, then its type will be CMyClass*.
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