July 16th, 2013, 04:13 PM
Mapping handles to device to hardware ID for same device
I have two instances of a given device on a given machine (actually they are different devices but they use the same driver). I need to know which of these two instances I am talking to.
The problem seems to boil down to mapping an open device handle (or name, e.g. \\DosDevices\MyDevice-0) to the unique device ID(e.g. PCI\VEN_xxxx&DEV_yyyy&SUBSYS_nnnnnnn&REV_B5\3&11583659&0&E2). Notice that the uniqueness of the ID is in the tail, in this case, '3&11583659&0&E2'.
The handle is obtained from a call to CreateFile(sName, .... ).
The device ID is coming in through a call to CM_Get_Device_ID_Ex(), which in turn uses a descriptor returned by SetupDiEnumDeviceInfo(), which in turn uses a handle returned by SetupDiGetClassDevsEx(), none of which uses a device name or returns a handle of the type returned by CreateFile().
So, I can:
- Use the handle to get the unique ID for that device, then match on the ID from the SetupDi*() and CM_*() functions ... but how to get the ID using the handle?
- Get the name of the device using the SetupDi*() or CM*(), so I can get a handle from CreateFile() ... but how to get the name?
Any other way to do this?
July 17th, 2013, 11:56 AM
Re: Mapping handles to device to hardware ID for same device
I will answer my own question for benefit of the search engines ... I was working on development hardware in which the device ID and vendor ID were set to pre-release default values. The right way to do this is to program the boards with unique IDs, which the hardware engineers will soon be doing.
Click Here to Expand Forum to Full Width
This a Codeguru.com survey!