Interop Events

[Stryker.Ninja]

First time poster, please be gentle

I am using a third party ocx control in a C# 2.0 application. The
interop seems to be working fine except for events. When I try and
attach an event, it only succeeds for one event at a time. Examples:

// works by itself
OCXClass.Event1 += new OCXClass.EventHandler(Event1_Sub);

// second call fails
OCXClass.Event1 += new OCXClass.Event1Handler(Event1_Sub);
OCXClass.Event2 += new OCXClass.Event2Handler(Event2_Sub);

// works, but Event 2 is only thing available
OCXClass.Event1 += new OCXClass.Event1Handler(Event1_Sub);
OCXClass.Event1 -= new OCXClass.Event1Handler(Event1_Sub);
OCXClass.Event2 += new OCXClass.Event2Handler(Event2_Sub);

Has anyone seen this type of behavior before? thanks in advance for
any tips.

 

[Dave Sexton]

Hi Stryker,

// second call fails
OCXClass.Event1 += new OCXClass.Event1Handler(Event1_Sub);
OCXClass.Event2 += new OCXClass.Event2Handler(Event2_Sub);

By "fails" do you mean that an Exception is thrown? If so I'd assume that the error has to do with an implementation detail of the
control and since the control is third-party it's hard to say what could actually be happening. Post the error if you can. You
might want to contact the control's vendor or creator on this one.

 

[Stryker]

Thanks Dave,

I did mean exception thrown. Here it is:

[System.Runtime.InteropServices.COMException] = {"Exception from
HRESULT: 0x80040202"}
StackTrace = " at
System.Runtime.InteropServices.ComTypes.IConnectionPoint.Advise(Object
pUnkSink, Int32& pdwCookie)\r\n at
WTReaderNet.ILRXReaderNetXEvents_EventProvider.add_OnTagMovedReader(ILRXReaderNetXEvents_OnTagMovedReaderEventHandler
)\r\n at WTReaderNet.L...

I kind of thought it was too generic to post.

I have contacted the vendor with no response yet, but I have a feeling
it will be "we don't support .Net implementation" since the examples
they give are all in VB6. I was kind of hoping that interop was to
blame, and that someone else had seen a similar problem and had a
workaround.

 

[Dave Sexton]

Hi Styrker,

Postng the error info did the trick. I searched for "HRESULT 0x80040202" on groups.google.com and found the following thread that
seems to address your issue (first of the results):

http://groups.google.com/group/micr...eaec54e3a5b?lnk=st&q=&rnum=1#b0924eaec54e3a5b

HTH

--
Dave Sexton

Thanks Dave,

I did mean exception thrown. Here it is:

[System.Runtime.InteropServices.COMException] = {"Exception from
HRESULT: 0x80040202"}
StackTrace = " at
System.Runtime.InteropServices.ComTypes.IConnectionPoint.Advise(Object
pUnkSink, Int32& pdwCookie)\r\n at
WTReaderNet.ILRXReaderNetXEvents_EventProvider.add_OnTagMovedReader(ILRXReaderNetXEvents_OnTagMovedReaderEventHandler
)\r\n at WTReaderNet.L...

I kind of thought it was too generic to post.

I have contacted the vendor with no response yet, but I have a feeling
it will be "we don't support .Net implementation" since the examples
they give are all in VB6. I was kind of hoping that interop was to
blame, and that someone else had seen a similar problem and had a
workaround.