Re: i can't add a CArray member to a class !!! error c2248 !!! - C / C++ / MFC Discussion Boards

i can't add a CArray member to a class !!! error c2248 !!!

aliusam6-Dec-08 6:44

6-Dec-08 6:44

my program works fine, untill i tried to add some feature.
i added a " CArray<CString> AA " to my class in the header file and the code no longer compiles, i did not refrence the variable yet and it gives me a function related error, here is the error:

1>D:\Program Files\Microsoft Visual Studio 8\VC\atlmfc\include\afxtempl.h(272) : error C2248: 'CObject::operator =' : cannot access private member declared in class 'CObject'
1> D:\Program Files\Microsoft Visual Studio 8\VC\atlmfc\include\afx.h(554) : see declaration of 'CObject::operator ='
1> D:\Program Files\Microsoft Visual Studio 8\VC\atlmfc\include\afx.h(524) : see declaration of 'CObject'
1> This diagnostic occurred in the compiler generated function 'CArray<TYPE> &CArray<TYPE>::operator =(const CArray<TYPE> & )'
1> with
1> [
1> TYPE=CString
1> ]

if i comment out the line " CArray<CString> AA " the code compiles with no problem, i am using CArray in other parts in the program but not as members, they are created inside functions and they work fine

why is the error and what can i do about it?? i want to read a list from a text file that a user saves

Ali Usam AlCherchefchi

modified on Saturday, December 6, 2008 1:16 PM

Re: i can't add a CArray member to a class !!! error c2248 !!!

Jijo.Raj6-Dec-08 9:33

Jijo.Raj

6-Dec-08 9:33

Might be due to the parameters for CArray constructor. Try this one.

CArray<CString,CString&> AA;

I hope that will fix the error. Well, if you just want to keep a list of string, you could use CStringArray as well.

Regards,
Jijo.

_____________________________________________________

http://weseetips.com[^] Visual C++ tips and tricks. Updated daily.

Re: i can't add a CArray member to a class !!! error c2248 !!!

aliusam6-Dec-08 10:56

aliusam

6-Dec-08 10:56

thanks for the reply but that did not help
i tried

CArray<CString,CString&> AA;

and

CStringArray AA;

same error in both cases, it is looking for the operator =, but i did not use the variable yet Confused | :confused:

Ali Usam AlCherchefchi

Re: i can't add a CArray member to a class !!! error c2248 !!!

Jijo.Raj6-Dec-08 11:06

Jijo.Raj

6-Dec-08 11:06

Could you please post the code snippet of the whole class? So that i can have a look at it.

Regards,
Jijo.

_____________________________________________________

http://weseetips.com[^] Visual C++ tips and tricks. Updated daily.

Re: i can't add a CArray member to a class !!! error c2248 !!!

aliusam7-Dec-08 22:23

aliusam

7-Dec-08 22:23

hiii

this is the header:

#pragma once
#include "ga_dna.h"
#include "afxtempl.h"

#define NoOf_cValues		20
#define NoOf_rValues		51


class GA_Individual
{
public:
	GA_Individual(void);
public:
	virtual ~GA_Individual(void);
public:
	GA_DNA dna1;
           .
           .
           .
           .
           .
	// constructors
	GA_Individual(GA_DNA* pDNA);
	
	static unsigned short c[NoOf_cValues];
	static unsigned short r[NoOf_rValues];
public:
	// always call this function befor using the class to initialize it
	static bool initIndiv(void);


	CArray <CString> opamp;        //tried "	CArray <CString,CString&> opamp;
" and the same
};

the .cpp is like:

#include "StdAfx.h"
#include "GA_Individual.h"
//#define _CRT_RAND_S		// required to use rand_s()	// defined in the compiler comand line
#include "stdlib.h"
#include "windows.h"

#include <tchar.h>
#include <math.h>

unsigned short GA_Individual::c[NoOf_cValues];
unsigned short GA_Individual::r[NoOf_rValues];

GA_Individual::GA_Individual(void)
: Age(0)
{
	CArray <CString> opamp(void);   // i tried this line but it did not solve a thing
}

GA_Individual::~GA_Individual(void)
{
}

GA_Individual::GA_Individual(GA_DNA* pDNA)
{
......
}

bool GA_Individual::initIndiv(void)
{
......
}
.
....... other function definitions here
.

i noticed a thing, if i make the array a ststic ( static CArray <cstring> opamp; ) member the code compiles, i can use it as a static with few axtra lines, but i am thinking what if using it as static was not an option, one should be able to add any type to the class, right, even if it did not have the operator '=' ???

Ali Usam AlCherchefchi

Re: i can't add a CArray member to a class !!! error c2248 !!!

Richard Andrew x646-Dec-08 15:13

Richard Andrew x64

6-Dec-08 15:13

When you put it as a member in the header file, it gets instantiated as soon as the class is instantiated. You don't need to reference it to cause it to be called.

Therefore, you need to call the constructor in the header file, like so:

CArray<cstring,cstring> AA();

Re: i can't add a CArray member to a class !!! error c2248 !!!

aliusam7-Dec-08 22:42

aliusam

7-Dec-08 22:42

i tried but the same error, i also tried the initialization list but the same.

Ali Usam AlCherchefchi

Re: i can't add a CArray member to a class !!! error c2248 !!!

Snorri Kristjansson7-Dec-08 0:44

Snorri Kristjansson

7-Dec-08 0:44

"TYPE" needs to overload the '=' operator to work because when an item is added to the collection (CArray) a new instance of "TYPE" is created and the 'source' is copied into the new instance.
So for this to work you need to create a new class and overload the '=' operator to copy all data members.
BTW why don't you use CStringArray?

Re: i can't add a CArray member to a class !!! error c2248 !!!

aliusam7-Dec-08 22:34

aliusam

7-Dec-08 22:34

you mean to drive a class from "TYPE" and overload the '=' operator?? the CString already have one, or you mean to drive from the CArray and overload the '='??? i think this will work but not necessary, if the code will use the '=' operator each time i add an item this will be a big performance problem as the array may be long, 1000 or 10000, not sure yet.
now i think the problem is the class could not construct the array, but adding it in the constructor did not help!!!!

Ali Usam AlCherchefchi

Re: i can't add a CArray member to a class !!! error c2248 !!!

Snorri Kristjansson8-Dec-08 5:57

Snorri Kristjansson

8-Dec-08 5:57

No I don't mean that.
The error message you get is related to the '=' operator. Probably the class you declare the CArray in already has one? Or at least you are using '=' somewhere in your code for an instance of that class. You need to copy the AA member in the '=' operator definition yourself. E.g. AA.Copy( source.AA ); the CArray template does not have an '=' operator.

Re: i can't add a CArray member to a class !!! error c2248 !!!

aliusam9-Dec-08 11:42

aliusam

9-Dec-08 11:42

hiiii
thank you all for the help, now it is working really great.
but let me make things clear so if someone had the same problem can see where the error, cause the message you get from the compiler is not even close from the problem.

let say you have a class:

class BB
{
public
BB();
virtual ~BB();

CArray<cstring> AA; // or even a CAtringArray
BB &operator=(const BB &otherBB) // without this operator you cant add a CArray or CStringArray
}

Snorri wrote:
Probably the class you declare the CArray in already has one? Or at least you are using '=' somewhere in your code for an instance of that class

when i read that i new the problem, it is in my class, see no class has no operator'=' (that if you used it in the program), so if you dont define one, the compiler will, and it will do it by calling each member's '=' operator, and if the operator is not existed then it stops and gives an error, evry one knows that but the error explanation dont even mentions it, and when i searched i didnot find an answer, so one can be drifted away. thanks all again

regards

Ali Usam AlCherchefchi

Process

messages6-Dec-08 3:21

messages

6-Dec-08 3:21

Hi everyone
I want to learn programming about process but my search was not successful on the net because they are on the Java of course codeproject has some articles about process and threads but I want to learn it of basis so do you know any good book or source?
Thanks

Re: Process

Jijo.Raj6-Dec-08 4:36

Jijo.Raj

6-Dec-08 4:36

I recommend you this book - Programming Applications for Microsoft Windows by Jeffrey Richter.[^] Its an excellent one which covers process, threads and other stuffs.

Well, regarding articles, did you check the Process & Threads[^] section in codeproject?

Regards,
Jijo.

_____________________________________________________

http://weseetips.com[^] Visual C++ tips and tricks. Updated daily.

Re: Process

Mark Salsbery6-Dec-08 6:02

Mark Salsbery

6-Dec-08 6:02

Also there's MSDN:

DLLs, Processes, and Threads[^]

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

create x64 support ocx in visual c++ 6

samira forooghi5-Dec-08 23:18

samira forooghi

5-Dec-08 23:18

hi every one
i have one ocx that build it in mfc6.
i useed it in all Developers at 32 bits windows.
but when i drag control on the form in x64, crash the application.
i rebuile it in x64 and test it again but it didnt work.
pls help me.
how i can create x64 support ocx in visual c++ 6?

Re: create x64 support ocx in visual c++ 6

Hamid_RT6-Dec-08 4:16

Hamid_RT

6-Dec-08 4:16

Did you set MachineX64 (/MACHINE:X64) and other parameters for your project?

Re: create x64 support ocx in visual c++ 6

Hadi Dayvary6-Dec-08 8:11

Hadi Dayvary

6-Dec-08 8:11

Try setting a ocx project in VC9 for x86 and then see which options it sets for it.
maybe it helps
Goodluck Rose | [Rose]

www.logicsims.ir

Re: create x64 support ocx in visual c++ 6 [modified]

samira forooghi6-Dec-08 20:00

samira forooghi

6-Dec-08 20:00

Hi my dear master Big Grin | :-D

i will test it

with special thanks
Goodluck & Goodbye Rose | [Rose]

modified on Sunday, December 7, 2008 2:12 AM

Re: create x64 support ocx in visual c++ 6

Hamid_RT7-Dec-08 17:50

Hamid_RT

7-Dec-08 17:50

samira forooghi wrote:
no i dont .
where i must set it?

See How to: Configure Visual C++ Projects to Target 64-Bit Platforms[^].

How can i get text from CRichEditCtrl

york5285-Dec-08 19:36

york528

5-Dec-08 19:36

it's a chatting tool

and i use spy++ get the RichEdit20A handle from the dialog

but i can't use the handle to get the text

maybe it shields WM_GETTEXT msg

how can i get the text in another way??

Re: How can i get text from CRichEditCtrl

Code-o-mat6-Dec-08 2:14

Code-o-mat

6-Dec-08 2:14

Accessing data of another process isn't that simple...that's one of the main points of protected mode. What do you want to do that involves using spy++ and getting text from a control in another process?

> The problem with computers is that they do what you tell them to do and not what you want them to do. <

Re: How can i get text from CRichEditCtrl

york5286-Dec-08 4:08

york528

6-Dec-08 4:08

i want to carry out the auto reply function

so i have to get the chatting text from the dialog

and then analyse it and reply automatically

it's hard

i know

do more and you will learn more

Poke tongue | ;-P

thanks for reply

Re: How can i get text from CRichEditCtrl

Code-o-mat6-Dec-08 4:53

Code-o-mat

6-Dec-08 4:53

Most IM programs support plugins, maybe it would be easier to write one if the one you want to target there does so? Anyhows, docs say that WM_GETTEXT works over process boundaries for some controls, and for some it doesn't, so i guess for rich edit it doesn't work. You could try a trick but it's not too safe and reliable. You could allocate shared memory, lock it, post WM_GETTEXT to the control passing the address of the shared memory block, wait a while (sadly you can't really know if the rich edit control has processed that message yet or not) and then you should have the text in the memory block. However, this can lead to crashes and asynch problems. You could try for example filling the buffer with 1s, and then after you sent the message keep checking for a 0 character, assuming that you have allocated a big enough buffer, when the 0 is there then the rich edit has probably finished copying its text into the buffer (since 0 should be the last character of the text and we assume it is copying the text from its start to its end). Combining that with maybe some timeouting...
Or on a different aproach, you could inject a DLL into the process that hooks itself to the rich edit control and could for example when the control gets WM_SETTEXT copy the text into some shared buffer and notify your process of the change.
This all is just ideas, don't know if any of it could ever work.

> The problem with computers is that they do what you tell them to do and not what you want them to do. <

Re: How can i get text from CRichEditCtrl

york52810-Dec-08 17:57

york528

10-Dec-08 17:57

Thanks for your advise

I'll have a try Poke tongue | ;-P

How to write(or create) subkey under a key which only by modified by the Admin?

kcynic5-Dec-08 18:55

kcynic

5-Dec-08 18:55

Here, if i wanna modify a register key which need administrator priority, how to do it?
if use normal function RegOpenKeyEx and RegSetValueEx with a KEY_ALL_ACCESS will get a error that the access is denied.
Any ideas?

Regards.

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