Closing a Com Port

[geek]

I have a CVI application that utilizes a DLL (developed by someone else) that calls a DLL (developed by someone else) to initialize/open the com port to be used in my application.

This is OK for me because I dont need to worry about which com port I am using, but the only problem is when I exit my program the com port is still open and will not close out until I terminate execution of my CVI program. I guess because the DLL that opened the com port does not know when my program exits.

My question is, can I close a com port from within my application not knowing exactly which com port I am using?

In my testing obviously I know what com port I am using and when I try to do a CloseCom(4) it still does not close out the com port that I am using and obviously from a task manager perspective my program is still running.

Any ideas, Thanks.

[test_man]

I think CVI can only close comport if it is opened by cvi. Dll must close comport once you call its deinitialize function if it has any.

I also noticed that in CVI closes comport itself after you exit/stop debug application even if you don't call CloseCom function from cvi application.

[geek]

Is there a Windows Command or some sort of override command that will close the com port out for me? Because I dont have access to the DLL that initialzied the com port. Is there anyway I can close that com port at all?

Otherwise my problem will never exit out correctly until that com port is closed.

Any suggestions?

Thanks