The DIEnumDevicesProc function is an application-defined callback function that receives DirectInput devices as a result of a call to the IDirectInput::EnumDevices method.
BOOL CALLBACK DIEnumDevicesProc(
  LPCDIDEVICEINSTANCE lpddi,  
  LPVOID pvRef               
);
 Returns DIENUM_CONTINUE to continue the enumeration or DIENUM_STOP to stop the enumeration.
  Windows NT/2000: Requires Windows 2000.
  Windows 95/98: Requires Windows 95 or later. Available as a redistributable for Windows 95.
  Header: Declared in dinput.h.
  Import Library: User-defined.