<<Windows驱动开发技术详解>>随书光盘源码,共23章,开发环境主要是Visual studio.

				#include 
				#include 
				#include 
				#include "function.h"
				
				HANDLE GetDeviceViaInterface( GUID* pGuid, DWORD instance)
				{
					// Get handle to relevant device information set
					HDEVINFO info = SetupDiGetClassDevs(pGuid, NULL, NULL, DIGCF_PRESENT | DIGCF_INTERFACEDEVICE);
					if(info==INVALID_HANDLE_VALUE)
					{
						printf("No HDEVINFO available for this GUID\n");
						return NULL;
					}
				
					// Get interface data for the requested instance
					SP_INTERFACE_DEVICE_DATA ifdata;
					ifdata.cbSize = sizeof(ifdata);
					if(!SetupDiEnumDeviceInterfaces(info, NULL, pGuid, instance, &ifdata))
					{
						printf("No SP_INTERFACE_DEVICE_DATA available for this GUID instance\n");
						SetupDiDestroyDeviceInfoList(info);
						return NULL;
					}
				
					// Get size of symbolic link name
					DWORD ReqLen;
					SetupDiGetDeviceInterfaceDetail(info, &ifdata, NULL, 0, &ReqLen, NULL);
					PSP_INTERFACE_DEVICE_DETAIL_DATA ifDetail = (PSP_INTERFACE_DEVICE_DETAIL_DATA)(new char[ReqLen]);
					if( ifDetail==NULL)
					{
						SetupDiDestroyDeviceInfoList(info);
						return NULL;
					}
				
					// Get symbolic link name
					ifDetail->cbSize = sizeof(SP_INTERFACE_DEVICE_DETAIL_DATA);
					if( !SetupDiGetDeviceInterfaceDetail(info, &ifdata, ifDetail, ReqLen, NULL, NULL))
					{
						SetupDiDestroyDeviceInfoList(info);
						delete ifDetail;
						return NULL;
					}
				
					printf("Symbolic link is %s\n",ifDetail->DevicePath);
					// Open file
					HANDLE rv = CreateFile( ifDetail->DevicePath, 
						GENERIC_READ | GENERIC_WRITE,
						FILE_SHARE_READ | FILE_SHARE_WRITE,
						NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
					if( rv==INVALID_HANDLE_VALUE) rv = NULL;
				
					delete ifDetail;
					SetupDiDestroyDeviceInfoList(info);
					return rv;
				}