Communicate with USB printer

Hello,


I read that I can communicate with a USB printer using CreateFile.
But the problem is what to give as parameter for the filename ?

I tried several things but at this time nothing works :

   FileHandle := CreateFile(PChar(PortName),
                            GENERIC_READ or GENERIC_WRITE,
                            0,
                            nil,
                            OPEN_EXISTING,
                            0,
                            0);

I tried the printername, the port name ('USB002' and '\USB002')

What can I try else ?

Thanks

Regards