USB Port Identification

[koumodaki]

I have 3 USB ports on my PC. I am using one for my keyboard and other is connected to a mouse and the 3rd one is free. But the device manager of my PC shows 5 USB Universal Host controllers 27C8,27C9,27CA,27CB & 27CC. I will be connecting a controller board to the free USB port. I need to use CreateFile(), ReadFile() and WriteFile() to read and write to the USB port. Now how do I identify the free port?

[Cedric Moonen]

You don't access the USB port the same way you access a serial port (so, you don't specify the "port name" to the CreateFile function). Instead you get a handle to a device driver which will communicate with the USB device. So, you need to give the identification of this driver to the CreateFile function. This is of course totally dependant of which USB device you are trying to communicate with. Normally, this should be described in the documentation of the controller board.

Cédric Moonen Software developer
Charting control [v1.3]