ActiveX Multiple instances

[Sulman1]

Hi All,

I am developing an ActiveX at the mo. What I would like to be able to do is when the activex is placed on to a form (probably in UserControl_Initialize() function) is to determine if there is another instance of this activeX on the form already. If there is then I can expose some properties/methods for communicating between the two.

Any thoughts? Is this possible?

Cheers

[Calibra]

Originally posted by Sulman1
Hi All,

I am developing an ActiveX at the mo. What I would like to be able to do is when the activex is placed on to a form (probably in UserControl_Initialize() function) is to determine if there is another instance of this activeX on the form already. If there is then I can expose some properties/methods for communicating between the two.

Any thoughts? Is this possible?

Cheers

Possible?, probably yes,
adviseble> NO, most likely to end in an infinite loop between the 2 component's.

Add an function to the form to check if more than one exists and handle the communication between the component's there.

I even think it goes against the rules of ActiveX to incorparate such an function in an ActiveX component.

[Dave Sell]

Originally posted by Sulman1
Hi All,
I am developing an ActiveX at the mo. What I would like to be able to do is when the activex is placed on to a form (probably in UserControl_Initialize() function) is to determine if there is another instance of this activeX on the form already. If there is then I can expose some properties/methods for communicating between the two.
Any thoughts? Is this possible?
Cheers
Yes. Each could hold a reference to another VB6 object, called a Singleton. There is only one instance of the Singleton, and many clients can all hold a reference to the same object.

I go into it in some detail here:
http://www.vbforums.com/showthread.php?s=&threadid=310103&highlight=Singleton

Go to the very last post of mine and check out the SimulBrowse Singleton.