RE: Epics C# Library problems

["Bertrand Alain" <alain.bertrand@psi.ch>]

Currently the client implementation we made support arrays up to 65K elements, as we use only the 16 bit element count. I didn't found yet how Epics sends over arrays bigger than that and until I find it, I can't implement a fix.

 

However I will try to check if there is some hints somewhere.

 

If somebody do have the info about how the header is constructed for bigger arrays (and at the same time for variable sized array) it would help me adding those features inside the library.

 

Sincerely,

 

Alain Bertrand

 

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From: Perrier Pierre [mailto:piperrier@sopragroup.com]
Sent: Thursday, September 22, 2011 10:42 AM
To: Bertrand Alain
Cc: tech-talk@aps.anl.gov
Subject: RE: Epics C# Library problems

 

Hello,

 

It’s what I’ve did for the monitor and it doesn’t seem to work. With this context I’ve tested the monitoring of a string waveform record which has a length 2 elements and all seems ok. I think that the problem is caused by the length of my waveform record which is 307,200

 

Cheers,

 

Pierre Perrier

 

 

De : Bertrand Alain [mailto:alain.bertrand@psi.ch]
Envoyé : jeudi 22 septembre 2011 08:54
À : Perrier Pierre; tech-talk@aps.anl.gov
Objet : RE: Epics C# Library problems

 

For a simple get you should do the following:

 

EpicsClient client = new EpicsClient();

client.Config.ServerList.Clear();

client.Config.ServerList.Add("129.129.130.88:5064"); // replace with the broadcast address or with the server / gateway one

EpicsChannel<int[]> record = client.CreateChannel<int[]>("TOTO:INT");

int[] data = "">

for (int i = 0; i < data.Length; i++)

{

    if (i != 0)

        Console.Write(", ");

    Console.Write(i);

}

Console.WriteLine("");

 

 

For a monitor:

 

static void Main(string[] args)

{

    EpicsClient client = new EpicsClient();

    client.Config.ServerList.Clear();

    client.Config.ServerList.Add("129.129.130.88:5064"); // replace with the broadcast address or with the server / gateway one

    EpicsChannel<int[]> record = client.CreateChannel<int[]>("TOTO:INT");

    record.MonitorChanged += new EpicsDelegate<int[]>(record_MonitorChanged);

    Console.ReadKey();

}

 

static void record_MonitorChanged(EpicsChannel<int[]> sender, int[] newValue)

{

    for (int i = 0; i < newValue.Length; i++)

    {

        if (i != 0)

            Console.Write(", ");

        Console.Write(newValue[i]);

    }

    Console.WriteLine("");

}

 

Personally I never use the Get function.

 

Cheers,

 

Alain Bertrand

 

 

 

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From: tech-talk-bounces@aps.anl.gov [mailto:tech-talk-bounces@aps.anl.gov] On Behalf Of Perrier Pierre
Sent: Wednesday, September 21, 2011 4:40 PM
To: tech-talk@aps.anl.gov
Subject: Epics C# Library problems

 

Hello,

 

I’m trying the EPICS C# Library in order to create a client to manage a Camera IOC. Unfortunately, I have some problems with the monitoring of waveforms records.

 

I want to monitor a waveform PV which contains data of a 640x480 gray scale picture (integers from 0 to 255). So it’s a large waveform of 307,200 elements. When  I process the following code, I catch a “Server did not respond in Time to Get Request” exception ( or , in debug mode,  the code doesn’t return).

 

 

EpicsClient m_client = new EpicsClient();

try{

                EpicsChannel<int> m_acquisitionCamera = m_client.CreateChannel<int>(“CameraJAI :Acquisition”) ;

                Int[] l_data = m_acquisitionCamera.Get<int[]>() ; 

} catch (Exception e){

                System.Console.WriteLine(e.Message) ;

                System.Console.WriteLine(e.StackTrace) ;

}

 

Is there a way to fix this problem ? Any advices ? In order to really create a monitor, someone can show me a short sample of an EPICS C# monitor which manages an array record.

 

 

Best Regards,

Pierre PERRIER

Stagiaire - MCO LIL

Sopra group.

Parc Innolin
9 rue du Golf 33700 Merignac
Phone : +33 (0)5 56 12 79 59
piperrier@sopragroup.com - www.sopragroup.com

 

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