C / C++ / MFC

How to authorize a dll loading.

31-May-07 23:26

anilkrupakar wrote:
I am running five instances of an exe simultaneously. will there be any memory sharing or memory over writings.

No.

anilkrupakar wrote:
Suppose i have a strcuture i the code . when i am running five instances will memory allocated for that structure will be different?

Yes.

You have to explicitely handle shared memory if you need it.
Smile | :)

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.

BusaBird31-May-07 23:09

BusaBird

31-May-07 23:09

Hi all,

Is there a way to allow only a specified program to load a dll.

For example: There is a dll called "test.dll" and I don't want other programs loading it except "test.exe". Is there a way to check the caller in dll main function and denide access if the caller is not authorized.

thanks.
Arun

Re: How to authorize a dll loading. [modified]

Jeffrey Walton1-Jun-07 7:27

Jeffrey Walton

1-Jun-07 7:27

Hi Toxcct,

toxcct wrote:
that's stupid...

You're not playing well with others in the sandbox...

I've received the same sort of answers before (from PhD's no less). It made no sense because there was no context of the problem domain. What do you know of the OP's problem domain or project requirements? I did not see it in the original post.

Perhaps the OP has developed an RSA Integer Factorization algorithm he wants to use in his work only: the first being his RSA modulous generation program (to test that n = p * q ), and a second to factor other's moduli. In this case he may not want to share the functionality - for example, the NSA[^] has threatened him with bodily harm.

Finally, what if the DLL is actually a resource of custom graphics or messages...

Jeff

Rajkumar R1-Jun-07 0:12

Rajkumar R

1-Jun-07 0:12

Hi,
I am not sure whether we can deny access to dll using system control.
But you can do that in your way.

For instance if your dll export a function
CYourDllClass *CreateInstance();
and the object it returns is needed for further processing.

you can do this

CYourDllClass *CreateInstance(yourSecurityKey)
{
if (Authorised(yourSecurityKey))
{
return new CYourDllClass();
}
else
{
return NULL;
}
}

Best Regards

-- modified at 6:42 Friday 1st June, 2007

Jeffrey Walton1-Jun-07 7:47

Jeffrey Walton

1-Jun-07 7:47

Hi BusaBird,

I'm not sure if you can exit at load (other than return an error from DllMain), but the following may help:

How to let a DLL know which application uses it[^]

Jeff

BusaBird5-Jun-07 2:21

BusaBird

5-Jun-07 2:21

Thanks for your reply.

Jeffrey Walton5-Jun-07 2:26

Jeffrey Walton

5-Jun-07 2:26

No problem BusaBird. Apparently, others did not think so highly of the response - I received two 1.0's. Ouch!

Perhaps one of the poster's who I criticized for the content of their message has taken revenge. Oh well.

Jeff

error C2061: Please Help

Programm3r31-May-07 22:47

31-May-07 22:47

Hi all,

For some or other strange reason when I compile my project I receive the following error:

Error 1 error C2061: syntax error : identifier 'LPSECURITY_ATTRIBUTES' c:\program files\microsoft visual studio 8\vc\platformsdk\include\winuser.h 1317

winuser.h Confused | :confused:

Can anyone please assists me.
Many Thanks.
Regards,

The only programmers that are better than C programmers are those who code in 1's and 0's..... Smile | :)

Programm3r
My Blog: ^_^

toxcct31-May-07 22:56

toxcct

31-May-07 22:56

do you have any other error before this one ?
moreover, what compiler do you use exactly ?

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Programm3r31-May-07 23:02

31-May-07 23:02

No, none, only these (all from winuser.h):

Error	1	error C2061: syntax error : identifier 'LPSECURITY_ATTRIBUTES'
Error	2	error C2061: syntax error : identifier 'LPSECURITY_ATTRIBUTES'
Error	9	error C2061: syntax error : identifier 'LPSECURITY_ATTRIBUTES'
Error	10	error C2061: syntax error : identifier 'LPSECURITY_ATTRIBUTES'
Error	12	error C2061: syntax error : identifier 'LPSECURITY_ATTRIBUTES'
Error	13	error C2061: syntax error : identifier 'LPSECURITY_ATTRIBUTES'
Error	14	error C2061: syntax error : identifier 'LPSECURITY_ATTRIBUTES'
Error	15	error C2061: syntax error : identifier 'LPSECURITY_ATTRIBUTES'
Error	21	error C2061: syntax error : identifier 'LPSECURITY_ATTRIBUTES'
Error	22	error C2061: syntax error : identifier 'LPSECURITY_ATTRIBUTES'
Error	23	error C2061: syntax error : identifier 'LPSECURITY_ATTRIBUTES'
Error	24	error C2061: syntax error : identifier 'LPSECURITY_ATTRIBUTES'
Error	26	error C2061: syntax error : identifier 'LPSECURITY_ATTRIBUTES'
Error	27	error C2061: syntax error : identifier 'LPSECURITY_ATTRIBUTES'

The only programmers that are better than C programmers are those who code in 1's and 0's..... Smile | :)

Programm3r
My Blog: ^_^

toxcct31-May-07 23:05

toxcct

31-May-07 23:05

then, as CPallini suggested, haven't youremoved a #include <windows.h> directive in your stdafx.h header ?

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Programm3r31-May-07 23:12

31-May-07 23:12

O.K, so I have created a test win32 console application.

#include "stdafx.h" // NO '#include' here...
#include <conio.h>
#include <windows.h>
#include <winbase.h>
#include <winuser.h>

int _tmain(int argc, _TCHAR* argv[])
{
	printf("Just testing!!!\n");
	_getch();
	return 0;
}

But still

:
Error 1 error C2061: syntax error : identifier 'LPSECURITY_ATTRIBUTES' ..\winuser.h
Error 2 error C2061: syntax error : identifier 'LPSECURITY_ATTRIBUTES' ..\winuser.h

The only programmers that are better than C programmers are those who code in 1's and 0's..... Smile | :)

Programm3r
My Blog: ^_^

CPallini31-May-07 23:24

31-May-07 23:24

Your test code compiles fine on my system (VS 2003).
Have you involuntarily modified any standard header file?
Confused | :confused:

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.

Programm3r31-May-07 23:29

31-May-07 23:29

No....

I have no idea whats going on ...

The only programmers that are better than C programmers are those who code in 1's and 0's..... Smile | :)

Programm3r
My Blog: ^_^

CPallini31-May-07 23:47

31-May-07 23:47

Try to send me (cpallini@tiscalinet.it) your headers...

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.

Programm3r1-Jun-07 0:02

1-Jun-07 0:02

Thanks Pallini,

I'm just busy with the VS2005 repair wizard. So I'll test it again, and let you know whether I got it working or not.

Thank you very much.
Regards,

The only programmers that are better than C programmers are those who code in 1's and 0's..... Smile | :)

Programm3r
My Blog: ^_^

Programm3r1-Jun-07 1:01

1-Jun-07 1:01

Email has been sent.

Regards,

The only programmers that are better than C programmers are those who code in 1's and 0's..... Smile | :)

Programm3r
My Blog: ^_^

Programm3r31-May-07 23:38

31-May-07 23:38

toxcct wrote:
what compiler do you use exactly ?

Visual Studio 2005 Professional Edition.

But I'm going to try a repair installation, maybe it will work.

Regards,

The only programmers that are better than C programmers are those who code in 1's and 0's..... Smile | :)

Programm3r
My Blog: ^_^

CPallini31-May-07 22:57

31-May-07 22:57

In fact winuser.h contains protoypes of functions using LPSECURITY_ATTRIBUTES as parameter, hence it as to be defined.
Maybe you're including (either directly or indirectly) winuser.h without prior to including windows.h.

Smile | :)

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.

Programm3r31-May-07 23:05