原创 OpenByInterface函数编译注意

// OpenByIntf.cpp - open device by device interface
// Copyright (c) 1998 Compuware Corporation

#define NOCRYPT   // prevent attempt to include missing files
#define _INC_EXCPT  // prevent excpt.h from being included

#include <stdlib.h>
#include <windows.h>
#include <winioctl.h>
#include <devintf.h> // DriverWorks

// OpenByInterface
//
// Opens the nth device found with the given interface class

HANDLE OpenByInterface(
  GUID* pClassGuid, // points to the GUID that identifies the interface class
  DWORD instance,  // specifies which instance of the enumerated devices to open
  PDWORD pError  // address of variable to receive error status
  )
{
 HANDLE hDev;
 CDeviceInterfaceClass DevClass(pClassGuid, pError);

 if (*pError != ERROR_SUCCESS)
  return INVALID_HANDLE_VALUE;

 CDeviceInterface DevInterface(&DevClass, instance, pError);

 if (*pError != ERROR_SUCCESS)
  return INVALID_HANDLE_VALUE;

 hDev = CreateFile(
  DevInterface.DevicePath(),
  GENERIC_READ | GENERIC_WRITE,
  FILE_SHARE_READ | FILE_SHARE_WRITE,
  NULL,
  OPEN_EXISTING,
  FILE_ATTRIBUTE_NORMAL,
  NULL
  );

 if (hDev == INVALID_HANDLE_VALUE)
  *pError = GetLastError();

 return hDev;
}

VC 6 或vs2008编译上面接口函数时候要link 到setupapi.lib库文件，编译才不出错