Used by IDXTransform::GetInOutInfo to specify whether an input or output data object is required.
Syntax
typedef enum DXINOUTINFOFLAGS { 
  DXINOUTF_OPTIONAL  = ( 1L << 0 )
} DXINOUTINFOFLAGS;
Constants
- DXINOUTF_OPTIONAL
 Indicates the input or output data object is not required
Remarks
Using NULL instead of DXINOUTF_OPTIONAL indicates that the input or output data object is required.
Requirements
| Minimum supported client | Windows XP | 
| Minimum supported server | Windows 2000 Server | 
| Header | Dxtrans.h | 
| IDL | Dxtrans.idl |