Esmirna

i want to take control over the ports, so no one could acces to the devices attached there. When trying to use the CreateFile function, i don't know where the lpDeviceName is stored so i cannot call it. Where can i find the root and name of all ports or devices of a computer? for example usb ports, cdrom...

Eggbert

>i want to take control over the ports, so no one could acces to the devices attached there.
To what end?

Esmirna

mater thesis

Eggbert

The easiest way to lock a port is to disable the service/daemon. This terminates the device driver and nobody can access the device. Alternatively you could truly lock the device by writing or reading to it infinitely to create your own micro-DoS attack.

However, I imagine that you want your code to be able to access the device while disallowing any other programs access. For that, you need to work with the device driver (through the proper interface) to lock it for your exclusive use. How to go about that depends heavily on your system, hardware, and the driver involved.

Esmirna

> you need to work with the device driver

i'm working with a wXP, so i don´t know where to look for the interface of their usb drivers. msdn maybe?

but i still don´t understand why can´t i open a handle of the port using CreateFie and then block any other acces by open it on a restricted mode

Eggbert

>i still don´t understand why can´t i open a handle of the port using
>CreateFie and then block any other acces by open it on a restricted mode
CreateFile will not work if you don't have the correct name to open. This may give you some ideas on finding the name.