C / C++ / MFC

23-Jul-01 22:38

I would like to know if someone could answer me to simple problem: We suppose that we create a class MyClass where there are methods(method1(), method2()...) where one have to use another method of MyClass. For example, suppose that method1 need of method2 in its implementation, how could i do that?

thanks in advance

gerald

Christian Graus23-Jul-01 23:01

Christian Graus

23-Jul-01 23:01

I don't understand ? You want to call method1() from inside method2() ? What's the problem ? Just do it.

If you mean from another instance of the class, make the method static and you'll only have one instance of the method across all classes.

Christian

#include "std_disclaimer.h"

The careful application of terror is also a form of communication.

Eagles may soar, but weasels don't get sucked into jet engines.

Gerry23-Jul-01 23:03

23-Jul-01 23:03

Not sure what you are after, perhaps you are talking about 2 objects, & passing one object into the other & calling a method.

Please Expand.

Gerry.

Christian Graus23-Jul-01 23:06

Christian Graus

23-Jul-01 23:06

Y'know, if you answered the guy who asked the question instead of me, he'd get an email alert that you were offering to help him. That would probably be a good thing.

Christian

#include "std_disclaimer.h"

The careful application of terror is also a form of communication.

Eagles may soar, but weasels don't get sucked into jet engines.

Gerry23-Jul-01 23:58

23-Jul-01 23:58

Sorry about that, clicked on the wrong button.

Smile | :)

Gerry.

Gérald Mercet23-Jul-01 23:05

23-Jul-01 23:05

So could i do that:
double MyClass::method1()
{....}

double MyClass::method2()
{.
.
.
double m=method1();
.
}

gerald

Gerry23-Jul-01 23:13

23-Jul-01 23:13

Yes, you can do that....You need to decide if the methods are public or private!

Gerry.

Gérald Mercet23-Jul-01 23:23

23-Jul-01 23:23

thanks for your help

Christian Graus23-Jul-01 23:16

Christian Graus

23-Jul-01 23:16

Absolutely.

You could also go

return method1();

at the end of method2 if you wanted to. It's completely available to you.

Christian

#include "std_disclaimer.h"

The careful application of terror is also a form of communication.

Eagles may soar, but weasels don't get sucked into jet engines.

Gérald Mercet23-Jul-01 23:24

23-Jul-01 23:24

thanks for your help!

how pointers work?

23-Jul-01 22:07

This Visual C++ is rather strange to me and I like to know about pointers... I´ve been working with Visual C++ only a two months and now this hole thing is just banging the head in the wall... So how these pointers are used? Meaning that where you construct the pointers and when you use them?

There were before a question, where somebody disclaim a working with directories etc. And there is pointer
pListoBox-> How you generate this kind of pointer in the code? Here is code which I copy / pasted earlier discussion (This code is written Carlos Antollini):

while(haveFile)
{
havefile = finder.FindNextfile();
if(finder.GetFileName().Find(".") == -1 && !finder.IsDirectory())
pListBox->AddString(((LPCTSTR)finder.GetFileTitle());
}

Gerry23-Jul-01 22:52

23-Jul-01 22:52

Pointers can be used anywhere in the programs you write. These are to save memory on startup and are faster to access and easier passed between methods.

We can allocate memory, use the resources, & deallocate the memory, keeping our system in good shape.

So, if we had.
someFunction() {
CListBox myListBox //Allocate memory on stack.

myListBox.AddString(""); //Call method.
}//Object destroyed on exit (out of scope).

or we could have

someFunction() {
CListBox* pListBox = new CListBox; //Allocate memory on stack.

pListBox->AddString(""); //Call method.

delete pListBox; //Destroy memory, give the system back the memory on the heap.
}

We can easily pass our pointers to other functions, saving time, no overhead in copying objects, copy by reference or copy by value, value is slower.

Hope this helps a bit....The best way to get experience with pointers is to use.

Gerry.

23-Jul-01 23:23

I think you can go read "A Beginner's Guide to Pointers"
which written by Andrew Peace. You can find this article in this site, it is quite helpful.
http://www.codeproject.com/cpp/pointers.asp
Hope this can help you... Smile | :)

23-Jul-01 23:39

Thanks for advises! I go and look that article...

And thanks very much of that code before, it clears also this thing much!

Re: Title: Out of memory ...

23-Jul-01 23:40

Thanks for advises! I go and look that article...

And thanks very much of that code before, it clears also this thing much!

Thanks Gerry & anomyous

23-Jul-01 23:41

I will look that article and thanks also that code, it helped out for understanding pointers!

Smile | :)

Title: Out of memory ...

Hadi Rezaee23-Jul-01 21:27

Hadi Rezaee

23-Jul-01 21:27

I'm writing program about database.
In my database i have 3 tables:

CDINFO, PERSON, GETGIVE

And i have 3 fields in CDINFO table:

FILMNAME ---> Text
FILMCODE ---> Integer
COUNT ---> Integer

I'm using of three objects of CDaoRecordset for opening each table ...
Now, i want to add new record in CDINFO:

COleVariant var;
char *szFilm = new char[50];
var.vt = VT_INT;

GetDlgItemText(IDC_EDIT1, szFilm, 50);
var.intVal = GetDlgItemInt(IDC_EDIT2);

m_rsCDINFO->AddNew();
m_rsCDINFO->SetFieldValue("FILMCODE", var);
m_rsCDINFO->SetFieldValue("FILMNAME", szFilm);
m_rsCDINFO->SetFieldValue("COUNT", var);
m_rsCDINFO->Update();

SetDlgItemText(IDC_EDIT1, "");
SetDlgItemText(IDC_EDIT2, "");

delete[] szFilm;

This code have not any error or warning, but when i'll running this code, program indicate to me error about: "Out of memory" !!!
Please tell me, what is my wrong ?
Confused | :confused:

My month article: Game programming by DirectX by Lan Mader.
Please visit in: www.geocities.com/hadi_rezaie/index.html

Hadi Rezaie

Gerry23-Jul-01 23:44