Re: Events on remote class and AddHandler

From: Sylvain Ross (sross_at_free.fr)
Date: 07/20/04 

Date: Tue, 20 Jul 2004 14:21:02 -0700

Thx Bob for your answer but I still have the problem :

I created on my client a class derived of MarshallByRefObject named
BlahClass, with only one sub "Blah" which display a messagebox for
testing purpose.

On my client form I instanciate an object from this class, and then write :
AddHandler myObj.myEvent,addressof myInstanceOfBlahClass.Blah

But I still have the problem.

Note that I created an other class that inherits from
MarshallByRefObject because I can't do it directly on my Form since it's
inheriting from Windows.Forms.Form

Thx in advance.

Bob Rundle wrote:
> Most likely your handler is in a class not derived from MBR. In this case
> the server wants to instantiate the object and is complaining that it can't
> find the assembly so that it can instantiate the object.
>
> Bob Rundle
>
> "Sylvain Ross" <sross@free.fr> wrote in message
> news:40fc7a83$0$29381$626a14ce@news.free.fr...
>
>>Hi,
>>I'm trying to raise an event from a remote class to a client.
>>
>>Here is it :
>>
>>I got a remote server serving a class Hello.
>>This class gots a public event defined like this
>>Public event myEvent()
>>
>>Then, on my client, I'm able to retreive my remote object correctly
>>(referenced by myObj).
>>But when trying to add the handler like this :
>>AddHandler myObj.myEvent,addressof aSubSomeWhere
>>I have no compilation error but a runtime exception :
>>
>>
>>
>
> ===========================================================================
>
>>System.IO.FileNotFoundException: File or assembly name Client, or one of
>>its dependencies, was not found.
>>File name: "Client"
>>
>>Server stack trace:
>> at System.Reflection.Assembly.nLoad(AssemblyName fileName, String
>>codeBase, Boolean isStringized, Evidence assemblySecurity, Boolean
>>throwOnFileNotFound, Assembly locationHint, StackCrawlMark& stackMark)
>> at System.Reflection.Assembly.InternalLoad(AssemblyName assemblyRef,
>>Boolean stringized, Evidence assemblySecurity, StackCrawlMark& stackMark)
>> at System.Reflection.Assembly.InternalLoad(String assemblyString,
>>Evidence assemblySecurity, StackCrawlMark& stackMark)
>> at System.Reflection.Assembly.Load(String assemblyString)
>> at
>>
>
> System.Runtime.Serialization.FormatterServices.LoadAssemblyFromString(String
>
>>assemblyName)
>> at System.DelegateSerializationHolder.GetDelegate(DelegateEntry de)
>> at System.DelegateSerializationHolder.GetRealObject(StreamingContext
>>context)
>> at
>>
>
> System.Runtime.Serialization.ObjectManager.ResolveObjectReference(ObjectHold
> er
>
>>holder)
>> at System.Runtime.Serialization.ObjectManager.DoFixups()
>> at
>>
>
> System.Runtime.Serialization.Formatters.Binary.ObjectReader.Deserialize(Head
> erHandler
>
>>handler, __BinaryParser serParser, Boolean fCheck, IMethodCallMessage
>>methodCallMessage)
>> at
>>
>
> System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Deserialize(S
> tream
>
>>serializationStream, HeaderHandler handler, Boolean fCheck,
>>IMethodCallMessage methodCallMessage)
>> at
>>
>
> System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Deserialize(S
> tream
>
>>serializationStream, HeaderHandler handler)
>> at
>>
>
> System.Runtime.Remoting.Channels.CoreChannel.DeserializeBinaryRequestMessage
> (String
>
>>objectUri, Stream inputStream, Boolean bStrictBinding)
>> at
>>
>
> System.Runtime.Remoting.Channels.BinaryServerFormatterSink.ProcessMessage(IS
> erverChannelSinkStack
>
>>sinkStack, IMessage requestMsg, ITransportHeaders requestHeaders, Stream
>>requestStream, IMessage& responseMsg, ITransportHeaders&
>>responseHeaders, Stream& responseStream)
>>
>>Exception rethrown at [0]:
>> at
>>System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage
>>reqMsg, IMessage retMsg)
>> at
>>System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData&
>>msgData, Int32 type)
>> at PublishedClasses.IHelloClass.add_endOfAll(endOfAllEventHandler obj)
>> at Client.Form1.Button1_Click(Object sender, EventArgs e) in
>>C:\Temp\RemotingClient\Client\Form1.vb:line 73
>>
>>Fusion log follows:
>>=== Pre-bind state information ===
>>LOG: DisplayName = Client, Version=1.0.1661.32062, Culture=neutral,
>>PublicKeyToken=null
>> (Fully-specified)
>>LOG: Appbase = C:\Temp\RemotingServer\Server\bin\
>>LOG: Initial PrivatePath = NULL
>>Calling assembly : (Unknown).
>>===
>>
>>LOG: Policy not being applied to reference at this time (private,
>>custom, partial, or location-based assembly bind).
>>LOG: Post-policy reference: Client, Version=1.0.1661.32062,
>>Culture=neutral, PublicKeyToken=null
>>LOG: Attempting download of new URL
>>file:///C:/Temp/RemotingServer/Server/bin/Client.DLL.
>>LOG: Attempting download of new URL
>>file:///C:/Temp/RemotingServer/Server/bin/Client/Client.DLL.
>>LOG: Attempting download of new URL
>>file:///C:/Temp/RemotingServer/Server/bin/Client.EXE.
>>LOG: Attempting download of new URL
>>file:///C:/Temp/RemotingServer/Server/bin/Client/Client.EXE.
>>
>>
>
> ===========================================================================
>
>>
>>If anyone got an idea, I don't even know if event a raisable remotely,
>>are they ?
>>
>>
>>Thx in advance
>>
>>Sylvain
>
>
>