Get a pointer to a VI

[dbtestcon]

I am using an ActiveX control that wants me to provide a pointer to the location of a sub routine.  The subroutine processes information passed back by the ActiveX control. How would this be coded in LV?  In C++, it looks like the code below:

int ProcessFile(const char *filein)
{
SetOutputHandler(myOutputHandler);

// addtional calls to ActiveX to process filein

}

void myOutputHandler(int type,int param)
{
  // routine to process tyep and param
}

So to sum it up, how do I create  myOutputHandler in LV and provide the ActiveX control a pointer to it?

[Wiebe@CARYA]

Only way to get a pointer to a vi is to build the vi into a dll, and use
loadlibrary and getprocaddress to get a pointer to the function.

There is actually another way, that uses .NET to get a pointer to a callback
that is inserted into a com object or something like that. I don't have any
experiance with that though.

Regards,

Wiebe.

[chrisger]

Hi there

if the control exports an event then you can use the "register event callback" function. This will let you pass a VI reference to a vi that will be called when the event arrives.

Can you post some code (including the control)?

[dbtestcon]

No.... unfortunatly no event is returned by the .dll.   It insists that I pass it a pointer and the it will decide when my code will be called.  I tossed that particular software in the trash and am going with a software vendor that is a bit more complient in the ways of coding.

I looked at the .net stuff as well as it might have worked with the whole delegate and proxy, but again decided it was too much trouble.

Thanks for the feedback!