How to open COMXX files(serial port)

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C++

C

Win32

serial-port

Hey everyone.

I've problem with serial port.

I've written a program that can read ports COM1 to COM9, but can open COMXX(like com10, com11, etc.)

I've searched and learnt that tCOM1–COM9 are part of the reserved names in the NT namespaces.
it says that "To acces files like COMXX you need to write "\\.\COMXX".

I've tried this, but didn't make it.

Does anybody have an idea?
My best regards...

The code below return an invalid handle value because of this problem:

myPort = CreateFile("\\.\COM14",
              GENERIC_READ | GENERIC_WRITE,
              0,    /* exclusive access  */
              NULL, /* no security attrs */
              OPEN_EXISTING,
              0,
              NULL );