Passing a COM object as a parameter via Remoting

[Catherine Jones]

Hi all, we need urgent help in a matter.

We are trying to pass a COM object from the client to server and are

facing some problems in the same.

We've our client in C# as well as the Server in C# and we're using

remoting for client to server communication.

Out client first creates an object of type System.__ComObj ect and

then passes it to our server using remoting, the

scenario can be visualized as :-

Com Server

Component A Exposing Interface IA and IB

C# Client

Type comType = Type.GetTypeFro mCLSID( CLSID_A )

object objDisp = Activator.Creat eInstance( comType );

TcpChannel chnl = new TcpChannel( 8086 );

ChannelServices .RegisterChanne l( chnl );

//Through Reflection now we call a method on this IA which returns

Dispatch of IB ( in C# we get this as System.__ComObj ect )

Now we're creating a CAO for our component CSA and call the method

which expects as parameter the System.__ComObj ect Created earlier

RemotingConfigu ration.Register ActivatedClient Type( typeof( CSA ),

"tcp://8085" );

CSA objCSA = new CSA.CSA();

objCSA.getSomet hing( objDisp );



C# Assembly

Component CSA

protected object m_objSess;

CSA::getSomethi ng( objDisp )

{

m_objSess = objDisp;

//Now using reflection we call a method of this

System.__ComObj ect passed as parameter
}



C# Server

BinaryServerFor matterSinkProvi der prov = new

BinaryServerFor matterSinkProvi der();

prov.TypeFilter Level = TypeFilterLevel .Full;
IDictionary prop = new HashTable();
prop["port"] = 8085;

TcpChannel chnl = new TcpChannel( prop, null, prov );

ChannelServices .RegisterChanne l( chnl );

RemotingConfigu ration.Register ActivatedServic eType( typeof( CSA ) );

System.Console. Readline();


Now on executing the code ,at line marked in red it throws an

exception telling that "System.Runtime .Remoting.Remot ingException: This

remoting proxy has no channel sink which means either the server has

no registered server channels that are listening, or this application has

no suitable client channel to talk to the server."

To remove this we opened a bi-directional ( as shown in the code

with blue color ) channel but when we do this the call hangs ( does not come

out ) from the line marked in red ( while invoking the method using

reflection ).

Could you please throw some light on the missing snippets of code if

any and provide us some guideline as to how to proceed to make the calls

successful.

Thanks a lot for your time!

[Tom Carter]

Hi Catherine,

First off there is no color that I can see in this post so it's a
bit difficult to follow. However, a couple of ideas come to mind.. No
firewall issues right?, Can you go back to the single directional
channels and verify that the port is actually open and ready to
recieve/transmit data? netstat...

else try...

TcpChannel channel = new TcpChannel(9000 );
ChannelServices .RegisterChanne l(channel);

SampleWellKnown objectWellKnown = new SampleWellKnown ();

// After the channel is registered, the object needs to be registered
// with the remoting infrastructure. So, Marshal is called.
ObjRef objrefWellKnown = RemotingService s.Marshal(objec tWellKnown,
"objectWellKnow nUri");
Console.WriteLi ne("An instance of SampleWellKnown type is published at
{0}.", objrefWellKnown .URI);

Console.WriteLi ne("Press enter to unregister SampleWellKnown , so that
it is no longer available on this channel.");
Console.ReadLin e();
RemotingService s.Disconnect(ob jectWellKnown);

Console.WriteLi ne("Press enter to end the server process.");
Console.ReadLin e();

~~~~~~~~~~~~~
Tommie Carter
www.premiertechnology.com
--
"Catherine Jones" <no*@moreply.co m> wrote in message news:<#Y******* *******@TK2MSFT NGP10.phx.gbl>. ..

Hi all, we need urgent help in a matter.

We are trying to pass a COM object from the client to server and are

facing some problems in the same.

We've our client in C# as well as the Server in C# and we're using

remoting for client to server communication.

Out client first creates an object of type System.__ComObj ect and

then passes it to our server using remoting, the

scenario can be visualized as :-

Com Server

Component A Exposing Interface IA and IB

C# Client

Type comType = Type.GetTypeFro mCLSID( CLSID_A )

object objDisp = Activator.Creat eInstance( comType );

TcpChannel chnl = new TcpChannel( 8086 );

ChannelServices .RegisterChanne l( chnl );

//Through Reflection now we call a method on this IA which returns

Dispatch of IB ( in C# we get this as System.__ComObj ect )

Now we're creating a CAO for our component CSA and call the method

which expects as parameter the System.__ComObj ect Created earlier

RemotingConfigu ration.Register ActivatedClient Type( typeof( CSA ),

"tcp://8085" );

CSA objCSA = new CSA.CSA();

objCSA.getSomet hing( objDisp );



C# Assembly

Component CSA

protected object m_objSess;

CSA::getSomethi ng( objDisp )

{

m_objSess = objDisp;

//Now using reflection we call a method of this

System.__ComObj ect passed as parameter
}



C# Server

BinaryServerFor matterSinkProvi der prov = new

BinaryServerFor matterSinkProvi der();

prov.TypeFilter Level = TypeFilterLevel .Full;
IDictionary prop = new HashTable();
prop["port"] = 8085;

TcpChannel chnl = new TcpChannel( prop, null, prov );

ChannelServices .RegisterChanne l( chnl );

RemotingConfigu ration.Register ActivatedServic eType( typeof( CSA ) );

System.Console. Readline();


Now on executing the code ,at line marked in red it throws an

exception telling that "System.Runtime .Remoting.Remot ingException: This

remoting proxy has no channel sink which means either the server has

no registered server channels that are listening, or this application has

no suitable client channel to talk to the server."

To remove this we opened a bi-directional ( as shown in the code

with blue color ) channel but when we do this the call hangs ( does not come

out ) from the line marked in red ( while invoking the method using

reflection ).

Could you please throw some light on the missing snippets of code if

any and provide us some guideline as to how to proceed to make the calls

successful.

Thanks a lot for your time!

[enrico sabbadin]

drop
ChannelServices .RegisterChanne l (new TcpChannel(0));

on startup in the "process" throwing the exception.

about hanging .. you might be facing an STA thread lock due to reentrancy ..
have a look at this

http://www.dotnetremoting.cc/FAQs/Ha...pplication.asp (the
link might be invalid, ingo site has moved if i rememebr well)
you can download from here
(http://www.codearchitects.com/casubs...n/default.aspx) a message
brokering system implemented in .net remoting which shows how to handle
correctly the above mentioned issues.

p.s.: i think you should avoid passing com objects across machine and
process boundaries .. you are asking for troubles ..

there are security issues and marshaling implementatin bugs for some -
execution flow/object type passed - patterns

IMO

"Catherine Jones" <no*@moreply.co m> wrote in message
news:#Y******** ******@TK2MSFTN GP10.phx.gbl...

Hi all, we need urgent help in a matter.

We are trying to pass a COM object from the client to server and are

facing some problems in the same.

We've our client in C# as well as the Server in C# and we're using

remoting for client to server communication.

Out client first creates an object of type System.__ComObj ect and

then passes it to our server using remoting, the

scenario can be visualized as :-

Com Server

Component A Exposing Interface IA and IB

C# Client

Type comType = Type.GetTypeFro mCLSID( CLSID_A )

object objDisp = Activator.Creat eInstance( comType );

TcpChannel chnl = new TcpChannel( 8086 );

ChannelServices .RegisterChanne l( chnl );

//Through Reflection now we call a method on this IA which returns

Dispatch of IB ( in C# we get this as System.__ComObj ect )

Now we're creating a CAO for our component CSA and call the method

which expects as parameter the System.__ComObj ect Created earlier

RemotingConfigu ration.Register ActivatedClient Type( typeof( CSA ),

"tcp://8085" );

CSA objCSA = new CSA.CSA();

objCSA.getSomet hing( objDisp );



C# Assembly

Component CSA

protected object m_objSess;

CSA::getSomethi ng( objDisp )

{

m_objSess = objDisp;

//Now using reflection we call a method of this

System.__ComObj ect passed as parameter
}



C# Server

BinaryServerFor matterSinkProvi der prov = new

BinaryServerFor matterSinkProvi der();

prov.TypeFilter Level = TypeFilterLevel .Full;
IDictionary prop = new HashTable();
prop["port"] = 8085;

TcpChannel chnl = new TcpChannel( prop, null, prov );

ChannelServices .RegisterChanne l( chnl );

RemotingConfigu ration.Register ActivatedServic eType( typeof( CSA ) );

System.Console. Readline();


Now on executing the code ,at line marked in red it throws an

exception telling that "System.Runtime .Remoting.Remot ingException: This

remoting proxy has no channel sink which means either the server has

no registered server channels that are listening, or this application has

no suitable client channel to talk to the server."

To remove this we opened a bi-directional ( as shown in the code

with blue color ) channel but when we do this the call hangs ( does not come
out ) from the line marked in red ( while invoking the method using

reflection ).

Could you please throw some light on the missing snippets of code if

any and provide us some guideline as to how to proceed to make the calls

successful.

Thanks a lot for your time!

[Catherine Jones]

Hi Enrico

Thanks for your time.
Although I'm able to find the issue related to hanging problem

( it was due to reentrancy problem ),

I come up to two solutions for this problem to solve:

1. Is to span a new worker thread

2. to use Moniker ( using the api createObjRefMon iker )

I just want your input on, if using createObjRefMon iker is safe ?

Regards.

"enrico sabbadin @ infinito" <sabbadin@infin ito_xyz.it> wrote in message
news:%2******** ********@TK2MSF TNGP11.phx.gbl. ..

drop
ChannelServices .RegisterChanne l (new TcpChannel(0));

on startup in the "process" throwing the exception.

about hanging .. you might be facing an STA thread lock due to reentrancy ... have a look at this

http://www.dotnetremoting.cc/FAQs/Ha...pplication.asp (the link might be invalid, ingo site has moved if i rememebr well)
you can download from here
(http://www.codearchitects.com/casubs...n/default.aspx) a message
brokering system implemented in .net remoting which shows how to handle
correctly the above mentioned issues.

p.s.: i think you should avoid passing com objects across machine and
process boundaries .. you are asking for troubles ..

there are security issues and marshaling implementatin bugs for some -
execution flow/object type passed - patterns

IMO

"Catherine Jones" <no*@moreply.co m> wrote in message
news:#Y******** ******@TK2MSFTN GP10.phx.gbl...

Hi all, we need urgent help in a matter.

We are trying to pass a COM object from the client to server and are

facing some problems in the same.

We've our client in C# as well as the Server in C# and we're using

remoting for client to server communication.

Out client first creates an object of type System.__ComObj ect and

then passes it to our server using remoting, the

scenario can be visualized as :-

Com Server

Component A Exposing Interface IA and IB

C# Client

Type comType = Type.GetTypeFro mCLSID( CLSID_A )

object objDisp = Activator.Creat eInstance( comType );

TcpChannel chnl = new TcpChannel( 8086 );

ChannelServices .RegisterChanne l( chnl );

//Through Reflection now we call a method on this IA which returns

Dispatch of IB ( in C# we get this as System.__ComObj ect )

Now we're creating a CAO for our component CSA and call the method

which expects as parameter the System.__ComObj ect Created earlier

RemotingConfigu ration.Register ActivatedClient Type( typeof( CSA ),

"tcp://8085" );

CSA objCSA = new CSA.CSA();

objCSA.getSomet hing( objDisp );



C# Assembly

Component CSA

protected object m_objSess;

CSA::getSomethi ng( objDisp )

{

m_objSess = objDisp;

//Now using reflection we call a method of this

System.__ComObj ect passed as parameter
}



C# Server

BinaryServerFor matterSinkProvi der prov = new

BinaryServerFor matterSinkProvi der();

prov.TypeFilter Level = TypeFilterLevel .Full;
IDictionary prop = new HashTable();
prop["port"] = 8085;

TcpChannel chnl = new TcpChannel( prop, null, prov );

ChannelServices .RegisterChanne l( chnl );

RemotingConfigu ration.Register ActivatedServic eType( typeof( CSA ) );

System.Console. Readline();


Now on executing the code ,at line marked in red it throws an

exception telling that "System.Runtime .Remoting.Remot ingException: This

remoting proxy has no channel sink which means either the server has

no registered server channels that are listening, or this application has
no suitable client channel to talk to the server."

To remove this we opened a bi-directional ( as shown in the code

with blue color ) channel but when we do this the call hangs ( does not

come

out ) from the line marked in red ( while invoking the method using

reflection ).

Could you please throw some light on the missing snippets of code if

any and provide us some guideline as to how to proceed to make the calls

successful.

Thanks a lot for your time!

[enrico sabbadin]

I've faced the problem in a message brokering system. In this case I put the
message in a .net queue , where another thread picks it up and deliver the
message. Using async delegate or the trhead pool is not an option if you
need to guarantee message / method call delivery order

I've never used createObjRefMon iker , will you elaborate on this option ?
"Catherine Jones" <no*@moreply.co m> wrote in message
news:ez******** ******@TK2MSFTN GP12.phx.gbl...

Hi Enrico

Thanks for your time.
Although I'm able to find the issue related to hanging problem

( it was due to reentrancy problem ),

I come up to two solutions for this problem to solve:

1. Is to span a new worker thread

2. to use Moniker ( using the api createObjRefMon iker )

I just want your input on, if using createObjRefMon iker is safe ?

Regards.

"enrico sabbadin @ infinito" <sabbadin@infin ito_xyz.it> wrote in message
news:%2******** ********@TK2MSF TNGP11.phx.gbl. ..

drop
ChannelServices .RegisterChanne l (new TcpChannel(0));

on startup in the "process" throwing the exception.

about hanging .. you might be facing an STA thread lock due to reentrancy

..

have a look at this

http://www.dotnetremoting.cc/FAQs/Ha...pplication.asp

(the

link might be invalid, ingo site has moved if i rememebr well)
you can download from here
(http://www.codearchitects.com/casubs...n/default.aspx) a message
brokering system implemented in .net remoting which shows how to handle
correctly the above mentioned issues.

p.s.: i think you should avoid passing com objects across machine and
process boundaries .. you are asking for troubles ..

there are security issues and marshaling implementatin bugs for some -
execution flow/object type passed - patterns

IMO

"Catherine Jones" <no*@moreply.co m> wrote in message
news:#Y******** ******@TK2MSFTN GP10.phx.gbl...

Hi all, we need urgent help in a matter.

We are trying to pass a COM object from the client to server and are

facing some problems in the same.

We've our client in C# as well as the Server in C# and we're using

remoting for client to server communication.

Out client first creates an object of type System.__ComObj ect and

then passes it to our server using remoting, the

scenario can be visualized as :-

Com Server

Component A Exposing Interface IA and IB

C# Client

Type comType = Type.GetTypeFro mCLSID( CLSID_A )

object objDisp = Activator.Creat eInstance( comType );

TcpChannel chnl = new TcpChannel( 8086 );

ChannelServices .RegisterChanne l( chnl );

//Through Reflection now we call a method on this IA which returns

Dispatch of IB ( in C# we get this as System.__ComObj ect )

Now we're creating a CAO for our component CSA and call the method

which expects as parameter the System.__ComObj ect Created earlier

RemotingConfigu ration.Register ActivatedClient Type( typeof( CSA ),

"tcp://8085" );

CSA objCSA = new CSA.CSA();

objCSA.getSomet hing( objDisp );



C# Assembly

Component CSA

protected object m_objSess;

CSA::getSomethi ng( objDisp )

{

m_objSess = objDisp;

//Now using reflection we call a method of this

System.__ComObj ect passed as parameter
}



C# Server

BinaryServerFor matterSinkProvi der prov = new

BinaryServerFor matterSinkProvi der();

prov.TypeFilter Level = TypeFilterLevel .Full;
IDictionary prop = new HashTable();
prop["port"] = 8085;

TcpChannel chnl = new TcpChannel( prop, null, prov );

ChannelServices .RegisterChanne l( chnl );

RemotingConfigu ration.Register ActivatedServic eType( typeof( CSA ) );

System.Console. Readline();


Now on executing the code ,at line marked in red it throws an

exception telling that "System.Runtime .Remoting.Remot ingException: This
remoting proxy has no channel sink which means either the server has

no registered server channels that are listening, or this application has
no suitable client channel to talk to the server."

To remove this we opened a bi-directional ( as shown in the code

with blue color ) channel but when we do this the call hangs ( does not come

out ) from the line marked in red ( while invoking the method using

reflection ).

Could you please throw some light on the missing snippets of code if

any and provide us some guideline as to how to proceed to make the

calls
successful.

Thanks a lot for your time!

[Catherine Jones]

Hello Enrico
Firstly thanks a lot for all your help and time.
I really appreciate that you are following up with me here.
Please help me resolve the issue.
We're making an MTA thread ( by default all the worker threads are MTA ) and there by we are marshalling our com object in this thread using
RuntimeServices .Marshal() and then unmarshal it in the worker thread using RuntimeServices .UnMarshal() and then call the method on server

passing this marshalled object.So what happens is that the Trasparent Proxy object lies with the main thread whereas the servercall goes on the child thread.

We prototyped it and it seems to work fine.

createObjRefMon iker :

Well in this case we create a named moniker of our com object and pass that name to server instead of the object itself, now using this name we get the com object reference on server and call the method on this.

Regards

Catherine
"enrico sabbadin @ infinito" <sabbadin@infin ito_xyz.it> wrote in message news:%2******** **********@tk2m sftngp13.phx.gb l...

I've faced the problem in a message brokering system. In this case I put the
message in a .net queue , where another thread picks it up and deliver the
message. Using async delegate or the trhead pool is not an option if you
need to guarantee message / method call delivery order

I've never used createObjRefMon iker , will you elaborate on this option ?


"Catherine Jones" <no*@moreply.co m> wrote in message
news:ez******** ******@TK2MSFTN GP12.phx.gbl...

Hi Enrico

Thanks for your time.
Although I'm able to find the issue related to hanging problem

( it was due to reentrancy problem ),

I come up to two solutions for this problem to solve:

1. Is to span a new worker thread

2. to use Moniker ( using the api createObjRefMon iker )

I just want your input on, if using createObjRefMon iker is safe ?

Regards.

"enrico sabbadin @ infinito" <sabbadin@infin ito_xyz.it> wrote in message
news:%2******** ********@TK2MSF TNGP11.phx.gbl. ..

drop
ChannelServices .RegisterChanne l (new TcpChannel(0));

on startup in the "process" throwing the exception.

about hanging .. you might be facing an STA thread lock due to reentrancy

..

have a look at this

http://www.dotnetremoting.cc/FAQs/Ha...pplication.asp

(the

link might be invalid, ingo site has moved if i rememebr well)
you can download from here
(http://www.codearchitects.com/casubs...n/default.aspx) a message
brokering system implemented in .net remoting which shows how to handle
correctly the above mentioned issues.

p.s.: i think you should avoid passing com objects across machine and
process boundaries .. you are asking for troubles ..

there are security issues and marshaling implementatin bugs for some -
execution flow/object type passed - patterns

IMO

"Catherine Jones" <no*@moreply.co m> wrote in message
news:#Y******** ******@TK2MSFTN GP10.phx.gbl...
> Hi all, we need urgent help in a matter.
>
> We are trying to pass a COM object from the client to server and are
>
> facing some problems in the same.
>
> We've our client in C# as well as the Server in C# and we're using
>
> remoting for client to server communication.
>
> Out client first creates an object of type System.__ComObj ect and
>
> then passes it to our server using remoting, the
>
> scenario can be visualized as :-
>
>
>
> Com Server
>
> Component A Exposing Interface IA and IB
>
> C# Client
>
> Type comType = Type.GetTypeFro mCLSID( CLSID_A )
>
> object objDisp = Activator.Creat eInstance( comType );
>
> TcpChannel chnl = new TcpChannel( 8086 );
>
> ChannelServices .RegisterChanne l( chnl );
>
> //Through Reflection now we call a method on this IA which returns
>
> Dispatch of IB ( in C# we get this as System.__ComObj ect )
>
> Now we're creating a CAO for our component CSA and call the method
>
> which expects as parameter the System.__ComObj ect Created earlier
>
> RemotingConfigu ration.Register ActivatedClient Type( typeof( CSA ),
>
> "tcp://8085" );
>
> CSA objCSA = new CSA.CSA();
>
> objCSA.getSomet hing( objDisp );
>
>
>
>
>
>
>
>
>
> C# Assembly
>
> Component CSA
>
>
>
>
>
> protected object m_objSess;
>
> CSA::getSomethi ng( objDisp )
>
> {
>
> m_objSess = objDisp;
>
> //Now using reflection we call a method of this
>
> System.__ComObj ect passed as parameter
>
>
> }
>
>
>
>
>
>
>
> C# Server
>
> BinaryServerFor matterSinkProvi der prov = new
>
> BinaryServerFor matterSinkProvi der();
>
> prov.TypeFilter Level = TypeFilterLevel .Full;
>
>
> IDictionary prop = new HashTable();
>
>
> prop["port"] = 8085;
>
> TcpChannel chnl = new TcpChannel( prop, null, prov );
>
> ChannelServices .RegisterChanne l( chnl );
>
> RemotingConfigu ration.Register ActivatedServic eType( typeof( CSA ) );
>
>
>
> System.Console. Readline();
>
>
>
>
>
>
> Now on executing the code ,at line marked in red it throws an
>
> exception telling that "System.Runtime .Remoting.Remot ingException:

This >
> remoting proxy has no channel sink which means either the server has
>
> no registered server channels that are listening, or this application

has

>
> no suitable client channel to talk to the server."
>
> To remove this we opened a bi-directional ( as shown in the code
>
> with blue color ) channel but when we do this the call hangs ( does not come
>
> out ) from the line marked in red ( while invoking the method using
>
> reflection ).
>
>
>
> Could you please throw some light on the missing snippets of code if
>
> any and provide us some guideline as to how to proceed to make the calls >
> successful.
>
> Thanks a lot for your time!
>
>

[enrico sabbadin]

thanks about the info on createObjRefMon iker.

using :
RuntimeServices .Marshal() and then unmarshal it in the worker thread using
RuntimeServices .UnMarshal() and then call the method on server

sounds like the coorect equivalent of what you had to do on native code , so
i think you are in the correct path

however, another option i think of is to use the GIT (global interface
table) to (marshal once, get a token, unmarshal (many times) using the
token)

btw , did you solve
------
System.Runtime. Remoting.Remoti ngException: This remoting proxy has no
channel sink which means either the server has no registered server channels
that are listening, or this application has no suitable client channel to
talk to the server."
------

dropping
ChannelServices .RegisterChanne l (new TcpChannel(0));
on the client side ?
"Catherine Jones" <no*@moreply.co m> wrote in message
news:u3******** *****@tk2msftng p13.phx.gbl...
Hello Enrico
Firstly thanks a lot for all your help and time.
I really appreciate that you are following up with me here.
Please help me resolve the issue.
We're making an MTA thread ( by default all the worker threads are MTA ) and
there by we are marshalling our com object in this thread using
RuntimeServices .Marshal() and then unmarshal it in the worker thread using
RuntimeServices .UnMarshal() and then call the method on server

passing this marshalled object.So what happens is that the Trasparent Proxy
object lies with the main thread whereas the servercall goes on the child
thread.

We prototyped it and it seems to work fine.

createObjRefMon iker :

Well in this case we create a named moniker of our com object and pass that
name to server instead of the object itself, now using this name we get the
com object reference on server and call the method on this.

Regards

Catherine
"enrico sabbadin @ infinito" <sabbadin@infin ito_xyz.it> wrote in message
news:%2******** **********@tk2m sftngp13.phx.gb l...

I've faced the problem in a message brokering system. In this case I put the message in a .net queue , where another thread picks it up and deliver the
message. Using async delegate or the trhead pool is not an option if you
need to guarantee message / method call delivery order

I've never used createObjRefMon iker , will you elaborate on this option ?
"Catherine Jones" <no*@moreply.co m> wrote in message
news:ez******** ******@TK2MSFTN GP12.phx.gbl...

Hi Enrico

Thanks for your time.
Although I'm able to find the issue related to hanging problem

( it was due to reentrancy problem ),

I come up to two solutions for this problem to solve:

1. Is to span a new worker thread

2. to use Moniker ( using the api createObjRefMon iker )

I just want your input on, if using createObjRefMon iker is safe ?

Regards.

"enrico sabbadin @ infinito" <sabbadin@infin ito_xyz.it> wrote in message
news:%2******** ********@TK2MSF TNGP11.phx.gbl. ..

drop
ChannelServices .RegisterChanne l (new TcpChannel(0));

on startup in the "process" throwing the exception.

about hanging .. you might be facing an STA thread lock due to reentrancy

..

have a look at this

http://www.dotnetremoting.cc/FAQs/Ha...pplication.asp

(the

link might be invalid, ingo site has moved if i rememebr well)
you can download from here
(http://www.codearchitects.com/casubs...n/default.aspx) a message
brokering system implemented in .net remoting which shows how to

handle correctly the above mentioned issues.

p.s.: i think you should avoid passing com objects across machine and
process boundaries .. you are asking for troubles ..

there are security issues and marshaling implementatin bugs for some -
execution flow/object type passed - patterns

IMO

"Catherine Jones" <no*@moreply.co m> wrote in message
news:#Y******** ******@TK2MSFTN GP10.phx.gbl...
> Hi all, we need urgent help in a matter.
>
> We are trying to pass a COM object from the client to server and are
>
> facing some problems in the same.
>
> We've our client in C# as well as the Server in C# and we're using
>
> remoting for client to server communication.
>
> Out client first creates an object of type System.__ComObj ect and
>
> then passes it to our server using remoting, the
>
> scenario can be visualized as :-
>
>
>
> Com Server
>
> Component A Exposing Interface IA and IB
>
> C# Client
>
> Type comType = Type.GetTypeFro mCLSID( CLSID_A )
>
> object objDisp = Activator.Creat eInstance( comType );
>
> TcpChannel chnl = new TcpChannel( 8086 );
>
> ChannelServices .RegisterChanne l( chnl );
>
> //Through Reflection now we call a method on this IA which returns
>
> Dispatch of IB ( in C# we get this as System.__ComObj ect )
>
> Now we're creating a CAO for our component CSA and call the method
>
> which expects as parameter the System.__ComObj ect Created earlier
>
> RemotingConfigu ration.Register ActivatedClient Type( typeof( CSA ),
>
> "tcp://8085" );
>
> CSA objCSA = new CSA.CSA();
>
> objCSA.getSomet hing( objDisp );
>
>
>
>
>
>
>
>
>
> C# Assembly
>
> Component CSA
>
>
>
>
>
> protected object m_objSess;
>
> CSA::getSomethi ng( objDisp )
>
> {
>
> m_objSess = objDisp;
>
> //Now using reflection we call a method of this
>
> System.__ComObj ect passed as parameter
>
>
> }
>
>
>
>
>
>
>
> C# Server
>
> BinaryServerFor matterSinkProvi der prov = new
>
> BinaryServerFor matterSinkProvi der();
>
> prov.TypeFilter Level = TypeFilterLevel .Full;
>
>
> IDictionary prop = new HashTable();
>
>
> prop["port"] = 8085;
>
> TcpChannel chnl = new TcpChannel( prop, null, prov );
>
> ChannelServices .RegisterChanne l( chnl );
>
> RemotingConfigu ration.Register ActivatedServic eType( typeof( CSA ) );
>
>
>
> System.Console. Readline();
>
>
>
>
>
>
> Now on executing the code ,at line marked in red it throws an
>
> exception telling that "System.Runtime .Remoting.Remot ingException:

This >
> remoting proxy has no channel sink which means either the server has
>
> no registered server channels that are listening, or this

application has

>
> no suitable client channel to talk to the server."
>
> To remove this we opened a bi-directional ( as shown in the code
>
> with blue color ) channel but when we do this the call hangs ( does

not come
>
> out ) from the line marked in red ( while invoking the method using
>
> reflection ).
>
>
>
> Could you please throw some light on the missing snippets of code if
>
> any and provide us some guideline as to how to proceed to make the calls >
> successful.
>
> Thanks a lot for your time!
>
>