Managed C++/CLI

Re: printing the address of a non static member function of a clss

6-Mar-06 3:34

firstly, you can be sure that the compiler shares only one copy of the member functions body.

but you could do this to test :

class cls {
    public;
    void f() {
    }
};
 
void main() {
    cls a, b;
    printf("%l %l", (void*)(&(a.f)), (void*)(&(b.f)));
}

-- modified at 13:19 Monday 6th March, 2006 (thanks Mike)

Amr Shahin6-Mar-06 3:51

Amr Shahin

6-Mar-06 3:51

the code u gave me didnt work!!

another thing
if the compiler always shares the space why would static functions exist in the first place???!!!

Re: printing the address of a non static member function of a clss

toxcct6-Mar-06 4:00

Re: printing the address of a non static member function of a clss

6-Mar-06 4:00

Amr Shahin wrote:
the code u gave me didnt work!!

why ?? any error ?

Amr Shahin wrote:
if the compiler always shares the space why would static functions exist in the first place???!!!

the difference between static/non-static member function are for the implicit this parameter. generally, a member function knows on which object it works on, because it is getting an implicit parameter, which is in C++ the this pointer. i say generally because static member function don't ! they can only perform general task, and can only access static members...

but no way this has to relates with body copies. a function body is written once in the source code, do why would it be loaded multiple times in memory.
the only difference between the calls are the parameters the function receives, but this is a stack problem...

Michael Dunn6-Mar-06 5:01

Michael Dunn

6-Mar-06 5:01

Amr Shahin wrote:
cout << (void*)f <<endl;

Change that to:

cout << (void*) &cls::f <<endl;

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

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Re: printing the address of a non static member function of a clss

Amr Shahin6-Mar-06 19:31

Amr Shahin

6-Mar-06 19:31

i tried ur code and it gave me the following error:

/***********************
test.cpp:13: error: invalid use of non-static member function ‘void cls::f()’
test.cpp:13: error: converting from ‘void (cls: Smile | :)

()’ to ‘void
****************************!!!/

any ideas ??

Problem Interfacing with Parallel Port

kmaster3-Mar-06 15:20

kmaster

3-Mar-06 15:20

Hi, I'm new to parallel port. Just to seek some help from here.

I've downloaded the Borland C++ 5.5 command line compiler...(I've followed all the steps required)
I also copied "inpout32.dll" to my system directory (C:\WINDOWS\system)
I'm using Windows 98... (LPT1 0378H)

But why I still can't run my programs? (written in C) Confused | :confused:

#include "stdio.h"
#include "dos.h"
#include "conio.h"

/********************************************/
/*This program set the parallel port outputs*/
/********************************************/

void main (void)
{
clrscr(); /* clear screen */
outportb(0x378,0xff); /* output the data to parallel port */
getch(); /* wait for keypress before exiting */
}

-- modified at 21:24 Friday 3rd March, 2006

Gordon Brandly3-Mar-06 15:40

Gordon Brandly

3-Mar-06 15:40

OK, let me be the first to tell you that you posted this question to the wrong forum. This is the C++/CLI forum.
I think your best bet would be to ask this question in the Hardware forum (since you're using Borland C++, I don't think the Visual C++ forum would be appropriate).

Having said that, I'll take a go at your problem (but you'd probably get a better answer over in Hardware): I believe that the free Borland C++ 5.5 is a Win32-only compiler, so I assume that's why you including that inpout32 DLL.

I'm pretty sure the code you wrote would work OK in Borland C++ 5.02 (or older) if you have it produce a 16-bit MS-DOS executable. Functions like outportb() are native to the compiler, and I don't think that 5.5, being a 32-bit compiler, even has those I/O functions. What you need to do is call the 32-bit functions in the DLL.

Assuming you're using the logix4u DLL, you can find a sample working program for Borland C++ here: http://www.hytherion.com/beattidp/comput/pport.htm[^]. The Test2.C program you'll find there should do the trick, I think.

Hope that helps.

kmaster3-Mar-06 20:35

kmaster

3-Mar-06 20:35

Sorry, I'm new to this site. Anyway, thanks for replying my message. Smile | :)

I've gone through "http://www.hytherion.com/beattidp/comput/pport.htm" Test2.C..

In order for the programs to work correctly with Borland 5.5, I have to add this two additional lines to it? Please advice.

#include "stdio.h"
#include "dos.h"
#include "conio.h"

/********************************************/
/*This program set the parallel port outputs*/
/********************************************/

short _stdcall Inp32(short portaddr);
void _stdcall Out32(short portaddr, short datum);
void main (void)
{
clrscr(); /* clear screen */
Out32(0x378,0xff); /* output the data to parallel port */
getch(); /* wait for keypress before exiting */
}

-- modified at 10:02 Sunday 5th March, 2006

Gordon Brandly5-Mar-06 9:16

Gordon Brandly

5-Mar-06 9:16

Adding those two lines would make the program work if you had one of the commercial Borland compilers. With any of the commercial versions you get a utility called IMPLIB that you would use to tell the compiler how to link to the functions in inpout32.dll. Since the free version 5.5 doesn't come with any utilities, you have to go through a more-complex technique of dynamically loading inpout32.dll.

That's why Test2.c is so much more complicated than your example; somewhere in there you'll see a call to the Win32 LoadLibrary() function, which is the heart of the dynamic loading technique. Though, as you can see in there, there are a lot of housekeeping details to take care of.

So, I think you have two choices:
1. Try compiling Test2.c, and if that's successful, study it until you understand it well enough to modify for your purposes.
2. Buy a commercial Borland or Microsoft compiler so you can use the simpler code you posted in your message. Another alternative might be the free Open Watcom[^] compiler, if it happens to come with an IMPLIB utility.

Good luck!

kmaster6-Mar-06 2:36

kmaster

6-Mar-06 2:36

OK! I think i would go for Microsoft VC++ compiler because my college has it! I think that would be more easier right?

Thanks for your advice Smile | :)

Convert Dicemal To Binry In C++

Gordon Brandly6-Mar-06 17:17

Gordon Brandly

6-Mar-06 17:17

Sure, that sounds reasonable. Just make sure it has the IMPLIB utility -- I don't think Visual C++ 2005 Express Edition has it, but I think all the other editions (and other years' editions) do have it.

Miss PC3-Mar-06 2:06

3-Mar-06 2:06

Hello Every One

I need your help to make a programm in C++
The program convert the dicemal numbers to binary using Recursion ..

I hope That you can help me ..

Waiting for you ..

Cedric Moonen3-Mar-06 3:02

3-Mar-06 3:02

There is no decimal or binary numbers. This is just a language misuse. A number is a number and is independent of its representation which can be decimal, hexadecimal, binary, ...

A small example (yup, for thos who know, it's still the good one with the apples Poke tongue | ;-P

). So, let's say you have 21 apples on a table, you can say "I have 21 apples", or "I have 0x15 apples" or "I have 0b10101 apples". You still have the same number of apples on your table, no matter which representation you use.

So, your question make as much sense as asking "I want to convert my 21 apples in binary, how to do that ?"

So, what you want to do exactly ? Converting a number into a string in binary or what ?

toxcct3-Mar-06 3:19

3-Mar-06 3:19

is it me, or we are repeating ourselves these days ?! Smile | :)

Cedric Moonen3-Mar-06 3:23

3-Mar-06 3:23

I don't know why but I have exactly the same feeling Wink | ;)

I think I will make a standard post and make a copy-paste each time. Maybe with some variations: instead of apples I can choose bananas, pears, oranges and why not fishes ?

toxcct3-Mar-06 3:26

3-Mar-06 3:26

i am personnaly getting a bit bored and am thinking of storing a link of a good answer on the subject, then only paste it as a reply...
especially when the question is asked in the wrong forum Sigh | :sigh:

Miss PC3-Mar-06 3:40

3-Mar-06 3:40

Thaaaaaanx alot every body for your replies
and I hope find answer for my quistion
Iam Sorry if I put my quistion in the wrong forum Blush | :O

but Iam new user

....still waiting for your help....

Miss PC3-Mar-06 3:30

3-Mar-06 3:30

Thanx alot for your explain Rose | [Rose]

now I undestand the difference Wink | ;)

ofcourse I mean convert the decimal numbuer to a binary string Smile | :)

So .. can any body help me?? Cool | :cool:

Cedric Moonen3-Mar-06 3:34

3-Mar-06 3:34

Take a look at _ltoa[^] function. It will convert a number into a string and you can specify the base of the value (2 in your case).

The Right Answer

Miss PC3-Mar-06 3:50

3-Mar-06 3:50

see this code .. try to apply it
Iam very happy .. Thanx alot for your helping

let's see the code .. if you have any guestion I will help you

#include <iostream.h><br />
#include <conio.h><br />
<br />
void convert(int i) {<br />
 if(i > 0) {<br />
   convert(i/2);<br />
   cout << i %2;<br />
 }<br />
}<br />
int main() {<br />
 int a;<br />
 cout<< "Please Enter The Number That You Want To Convert >> \t";<br />
 cin >> a;<br />
 convert(a);<br />
 getch();<br />
 return 0;<br />
}

Re: The Right Answer

Cedric Moonen3-Mar-06 3:56

3-Mar-06 3:56

Ouch, sorry, I forgot that you wanted to do with recursion (is it a homework BTW ?)

Yup, I think this will work (didn't check it in detail but it looks correct).

Re: The Right Answer

Miss PC3-Mar-06 4:09