🚀 go-pugleaf

"JD" <nospam@nospam.com> wrote in message
news:4492cbf9$1@newsgroups.borland.com...

> After some searching, it's been decided that the thread
> should not use WaitCommEvent

Why not?  That is the correct way to wait for events on a COM port.  Have
you read the MSDN articles on working with communication ports yet?  I
strongly suggest that you do so.

    Communications Resources

http://msdn.microsoft.com/library/en-us/devio/base/communications_resources.asp

    Serial Communications in Win32
    http://msdn.microsoft.com/library/en-us/dnfiles/html/msdn_serial.asp

The second article has a lot of sample source code in it.

> What I'm trying to do now is open the port twice

You can't do that.  A COM port can only be opened once.

> once for reading and another for writing

You would have to open it once for both reading and writing at the same
time:

    WCom = ::CreateFile( TEXT("COM1"), GENERIC_READ | GENERIC_WRITE, 0,
...);

Notice above that the sharing rights must also be set to 0 for exclusive
access.  You cannot share a COM port.

> but on the second call to CreateFile, I get an Access denied error:

As you should be.


Gambit