Retrieving PCI coordinates by Windows' API (us

问题:

Is there a way to obtain PCI coordinates (bus/slot/function numbers) of devices by using Windows c/c++ API (e.g PnP Configuration Manager API)? I already know how to do it in kernel mode, I need an user-mode solution. My target system is Windows XP-32 bit.

回答1:

I've eventually found a simple solution (it was just a matter of digging into MSDN).

This minimal code finds the device's PCI coordinates in terms of bus/slot/function:

DWORD bus, addr, slot, func;
HDEVINFO h; // Obtained by SetupDiGetClassDevs
SP_DEVINFO_DATA d; // Filled by SetupDiGetDeviceInterfaceDetail

SetupDiGetDeviceRegistryProperty(h,&d,SPDRP_BUSNUMBER,NULL,&bus,sizeof(bus),NULL);
SetupDiGetDeviceRegistryProperty(h,&d,SPDRP_ADDRESS,NULL,&addr,sizeof(addr),NULL);
slot = (addr >> 16) & 0xFFFF;
func = addr & 0xFFFF;

Note: for real production the output buffer's size must be obtained by a previous call of the API function in order to allocate it dynamically, and error checks must be added, of course.