How to check COM1 port already open or not

[jp071]

Hello,
Anybody can give me idea, How can i check COM port? I want to check, is it already open or not? if it is already open, just avoid to open the port.

Thanks.

[Ancient Dragon]

Just try to open it -- if open files then its probably already opened (assuming COM1 exists and there are no hardware problems)

[jp071]

My problem is not exactly that. I have another software that run semultaniously. The software also can open the COM1 port. If it opened, my program do not need to open COM1 port. Then Just i want to read data from the port.

[jencas]

If the COM1 port is in use by an other process, this resource is locked by the OS and subsequent tries to open the COM1 port will fail.

[jp071]

Thanks for your post. I could able to solve the problem.

[jencas]

Then mark this thread as solved, please

[Salem]

Better yet, tell US what you found out, how you solved it and then mark it closed.
Give something back.