how to retrieve a pci vga device base address ?

["Louis Lu" <netlu visto com>]

Hi 
  As we know, we can look at $>proc/pci to find out the 
whole PCi devices information.(ie. vendor id, device id and 
base address...etc.).  However, what if I tried to retrieve 
these vendor id, device id and base address from a PCi VGA 
device, is there anybody know how to do it by using GTK or
C in Linux?  

I am using RedgHat Linuxv6.1, Kernel 2.2.12
GNOME 1.0.39 and GTK.

I have developed a dialog and need these three (PCI) 
information to continue my project.  

I would appreciate if anyone can give a suggestion, sample 
code or references.  

Thanks in advance.

Louis
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