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C# ->> Memcache and deserialisation

Posted on 2014-03-24
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Last Modified: 2014-03-24
Hi,

I have a little C# application that successfully collects a value from memcache, it then attemptss to deserialise what I have using a memoryStream and BinaryFormatter.

Here is the code...

using (MemcachedClient writeClient = new MemcachedClient())
            {                
                string frObj= writeClient.Get<string>("myser");                
                byte[] byteArray = Encoding.ASCII.GetBytes(frObj);
                MemoryStream stream = new MemoryStream(byteArray);
                stream.Position = 0;
                BinaryFormatter bf = new BinaryFormatter();
                object d = bf.Deserialize(stream);
            }

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I can get at the data and retrieve it. I just cant deserialise it into an object. The follow line gives me a SerialisationException was unhandled runtime.
 object d = bf.Deserialize(stream);

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It states the following.
End of Stream encountered before parsing was completed.

I was wondering if anyone can help me to resolve this and prevent this runtime error or at least handle it.

Thank you.
Regards,
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Question by:meetsys
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8 Comments
 
LVL 75

Expert Comment

by:käµfm³d 👽
ID: 39951214
Deserialize the byte array that the MemoryStream holds, not the MemoryStream itself. In other words, change line 8 to:

 object d = bf.Deserialize(stream.ToArray());

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Author Comment

by:meetsys
ID: 39951237
That just gives off more runtime errors.

I get this one...

cannot convert from 'byte[]' to 'System.IO.Stream'

and an invalid arguments. This site is great. I never know about it before. Any ideas where I am going wrong.
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LVL 75

Expert Comment

by:käµfm³d 👽
ID: 39951241
What does your serialization code look like?
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Author Comment

by:meetsys
ID: 39951251
The serialisation code is a string of data that comes from another program. In fact it is actually serialised in .php and then passed to the 3rd party memcache and then picked up in c#. I'm just trying to deserialise it, not worried if it comes out wrong. Even if its not the same as how it went in. Just want to have something output.
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LVL 75

Expert Comment

by:käµfm³d 👽
ID: 39951258
If we're talking about the same PHP code that you demonstrated in your previous question, then I don't see where there is any serialization going on. Even if there were, you are talking about serialization/deserialization between two different programming languages. If you truly are serializing in your PHP code, then you need to use a form of serialization that is more cross-platform, like XML or JSON.
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Author Comment

by:meetsys
ID: 39951272
Sure I get it. But it should still do something. Some sort of process that doesn't involve the runtime error I was enquiring about. Thats all I am looking to resolve at present.
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LVL 75

Accepted Solution

by:
käµfm³d   👽 earned 2000 total points
ID: 39951277
OK, then if I am correct in that you are not serializing in the PHP, then simply remove the BinaryFormatter business.

i.e.

using (MemcachedClient writeClient = new MemcachedClient())
{                
    string frObj = writeClient.Get<string>("myser");
}

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Since it's a string that you put into memcached, that should be what you are getting back. No need to deserialize anything. Had you put something more involved into memcached--say a JSON object--then deserailization may come into play.
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Author Closing Comment

by:meetsys
ID: 39951482
Thanks for all your advise kaufmed. Really appreciate it. Tricky business, some of this serialisation, memcache stuff. Thanks
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