asynchronuous functions do not work in a c# used by CVI application dll

Hello

I have an application written with CVI 9.0.1, who must interact with a dll c# 2010 (which has no window) through a CVI<->wrapper .net (created with the controller of the CVI useful .net).

This c# dll uses the functions asynchronuous, as NetworkStream.BeginRead () and EndRead() of an object of System.Net.Sockets.TcpClient for example.

These asynchronuous functions work very well when the c# dll is used by a c# application (with a main window) or the c# dll is converted into a stand-alone c# program (having a window with buttons, call its methods, just to try), but asynchronuous functions do not work when my c# dll is called by my CVI application (which is my goal) : execution remains inside the NetworkStream.BeginRead () for example (for the concerned thread).

NetworkStream.BeginRead () can be bypassed successfully by using the function alternator NetworkStream.Read () instead, but the c# dll uses any other asynchronuous functions which have no associated alternator function.

Here's some c# code (I don't have the source code of the Snmp object; got_trap() method is never called when asynchonuous calls do not work):

public void run() / / wire

{

SNMP snmp = null;

Try

{

SNMP = new Snmp (true);

SNMP. NotifyListenPort = 162;

SNMP. NotifyRegister (null, null, new NotifyCallback (got_trap), CB_DATA_);

isActive = true;

Timeout.Infinite;

}

...

}

Thinking it might be a problem with the window messages that could not be processed (in the c# dll), I tried to replace the Timeout.Infinite statement in the code where the management of asynchronuous are held, by a creation of window over my loop of messages in Win32 window, but asynchronuous functions do not work better (while my loop seems to process messages successfully) :

Form myForm = new Form(); an empty window

myForm.Show ();

int bRet;

MSG msg = new MSG();

While ((bRet = GetMessage (out msg, IntPtr.Zero, 0, 0))! = 0)

{

If (bRet == - 1).

{

handle the error and possibly out

}

on the other

{

Switch (msg.message)

{

default: / / everything else

TranslateMessage (Ref msg);

DispatchMessage (Ref msg);

break;

}

}

}

Any idea?

Thank you

rvfr.

Solved: in fact, the Assembly of snmp I used just need to be registered dotNet.

rvfr.

Tags: NI Software

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