Chek if com port is in use by another application

[Tassos]

Hello!

It's my first time in the forum and i need your help!
I want to check, in vb 2008 code, if a com port is in use by another application so not to mess with it.
is the a way to do it?

Thank you very much,

Tassos

[Jan Axelson]

See this discussion:

http://stackoverflow.com/questions/195483/c-check-if-a-com-serial-port-is-already-open

Jan

[Tassos]

Thank you very much!

[Duss]

The solution to that problem in C# works very well. However, when I try the same approach in C++ (Windows Forms Application) it simply fails to catch the situation and fais into an error (exception) that actually is not caught by the program, even if I use the generic "Exception" type.

It is very annoying because my C++ application sometimes shows an existing COMport but it is already being used by another application and the program cannot determine if it really is being used or not.

Does anyone have an explanation?

[Jan Axelson]

Trying to open the port (with CreateFile) should tell you if it's in use.

Jan