C# Discussion Boards - CodeProject

Dan Neely29-Jun-06 2:21

29-Jun-06 2:21

Nader Elshehabi wrote:
I totally agree on the assembly language issue, but I thought that there was a managed DirectX in C#. Don't you think this will take over in game development in the next few years?

No. The need for an occasional full garbage collect on a gig of memory will kill gaming uses, because stopping for a second or three is completely unacceptable.

unmanaged DLL access from C#

farquem828-Jun-06 3:06

farquem8

28-Jun-06 3:06

I am attempting to access functions from an unmanaged C DLL. One of these is generating an Unhandled Exception: "attempt to read or write protected memory".

I have examples similar to mine on the web, all of which come down to the need for manual intervention in Marshaling. However, the function causing the problem for me returns void, and I can find no examples which deal with this case. Is this because I am barking up the wrong tree?

DLL function prototype:

<br />
void GetRNGstate(void);<br />

C# Code:

<br />
class TestLink<br />
    {<br />
        [DllImport("X.dll")]<br />
        [return: MarshalAs(UnmanagedType.IUknown)]<br />
        public static extern void GetRNGstate();<br />
<br />
        ...<br />
<br />
        static void Main()<br />
        {<br />
<br />
            GetRNGstate(); // Unhandled Exception<br />
<br />
            ...<br />
        }<br />
    }<br />

Any assistance appreciated.

Re: unmanaged DLL access from C#

Rojan Gh.28-Jun-06 3:33

Rojan Gh.

28-Jun-06 3:33

Hi!
At first I have to say that I'm not that expert, but some experiences:
I sometimes face the same problem, and when I search for the answer, I get the point: I just assigned or passed the wrong type of arguments or didn't pass the necessary arguments, as you said the function prototype is like this:

void GetRNGstate(void);

so I think you should do this:

[DllImport("X.dll")]
public static extern void GetRNGstate(delegate yourDelegate);

There is a really useful tool that I sometimes use and will help you undrestand how to use DllImport method and attribute (It uses windows API): ApiViewer 2004

Forgive me if I'm wrong! But just test it!
Smile | :)

Sojaner!

Re: unmanaged DLL access from C#

leppie28-Jun-06 7:28

leppie

28-Jun-06 7:28

farquem8 wrote:
[return: MarshalAs(UnmanagedType.IUknown)]

Remove that! Poke tongue | ;-P

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Re: unmanaged DLL access from C#

Rojan Gh.28-Jun-06 11:08

Rojan Gh.

28-Jun-06 11:08

Do you mean what I told is that wrong that should be removed? WTF | :WTF:

Sojaner!

Urgent

Shiv528-Jun-06 2:55

Shiv5

28-Jun-06 2:55

Dear All,

I have stored procedure of Dept(add/update/insert) and for Company(add/update/insert).

How to groups the procedure using then Procedure Groups in SQLServer

Re: Urgent

Dan Neely28-Jun-06 3:06

Dan Neely

28-Jun-06 3:06

Number 3.

http://www.codeproject.com/script/comments/forums.asp?msg=1278604&forumid=1649#xx1278604xx

Clickety Police

Colin Angus Mackay28-Jun-06 5:50

Colin Angus Mackay

28-Jun-06 5:50

http://www.codeproject.com/script/comments/forums.asp?msg=1278604&forumid=1649#xx1278604xx[^]

Scottish Developers events:
* .NET debugging, tracing and instrumentation by Duncan Edwards Jones and Code Coverage in .NET by Craig Murphy
* Developer Day Scotland: are you interested in speaking or attending?
My: Website | Blog

Re: Urgent

J4amieC28-Jun-06 3:44

J4amieC

28-Jun-06 3:44

Shiv, you are getting beyond a joke now. Seriously stop with the URGENT!

Current blacklist
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Re: Urgent

Josh Smith28-Jun-06 3:48

Josh Smith

28-Jun-06 3:48

The only thing which you should consider to be 'urgent' is seeking immediate and comprehensive psychiatric treatment.

Re: Urgent [modified]

User 665828-Jun-06 3:58

User 6658

28-Jun-06 3:58

That's a bit harsh. Some people just don't know how to use the internet correctly. Sigh | :sigh:

modified 12-Sep-18 21:01pm.

Re: Urgent

Josh Smith28-Jun-06 5:11

Josh Smith

28-Jun-06 5:11

That guy has been told dozens of times not to post every question as "Urgent", so I disagree that I am being harsh. The guy must have issues and really should get some help.

Josh

Re: Urgent

Paul Conrad28-Jun-06 8:00

Paul Conrad

28-Jun-06 8:00

Josh Smith wrote:
That guy has been told dozens of times not to post every question as "Urgent", so I disagree that I am being harsh. The guy must have issues and really should get some help.

Maybe some people don't understand that "urgent" is not the magic word and it is also not my middle name Smile | :)

I do not think you are being harse because these "urgent" posts really start pissing me off. Urgent! I need the winning lottery ticket for tonight Laugh | :laugh:

Re: Urgent

BoneSoft28-Jun-06 10:34

BoneSoft

28-Jun-06 10:34

Paul Conrad wrote:
Maybe some people don't understand that "urgent" is not the magic word

Then the multiple replies stating so to every request should help them get a clue.

Try code model generation tools at BoneSoft.com.

Re: Urgent

stancrm28-Jun-06 3:58

stancrm

28-Jun-06 3:58

This is an example of a person, who doesn't want to do his/her own homework and just put the assignment into this forum and hope that someone replying and never giveup.

Sorry, but it's wrong.

- DON'T PUT URGENT INTO SUBJECT Mad | :mad: