I have a project that need translate the attached C# code into LabVIEW GUI (CSharp_EventLog.pdf), trying to do some basic code shown as EventLog.PNG, but seems not working. I do send event from server side, but this piece of code does not get any response. I am not familiar with ActiveX and C#, need some suggestions on: 1. Is there any wrong with my LabVIEW code, why there is no event response? Read C# code, there seems Class cast and/or Automation refnum cast? not sure how to code it in LabVIEW. 2. In the Call back vi, event data is variant, I expected to be string. Thanks in advance. Jason

It looks like you are receiving not event data, but reference to event object. You need to convert it to ActiveX object, not to string. Then you can work with activex object: get properties (Property node should show field Date C# analog is evt.Date) and call methods (GetEventKey(evt)). You can not write in C# something like ToString(evt). May be you can, but you will get the same 64 bit hex number, not event data. You write ToString(evt.Date) - first get evt field Date, then show it as string. To convert, you need class specifier constant. Copy TCEVENTLogger... control to callback vi, convert it to constant and select correct ActiveX class (something like Event from TCEVENTLOGGERLib).

LabVIEW

C# activeX

Solved!

Author

Hi Alexander_Sobolev,

It solves the problem. Thank you very much.

Here attached the callback VI, I tested it and I could get the correct SourceName and GetMsgString from this VI.

Jason

Message 11 of 11

(770 Views)

LabVIEW

C# activeX

Re: C# activeX