Unimplemented.
int fwide(
   FILE *stream,
   int mode;
);
Parameters
- stream 
 Pointer to FILE structure (ignored).
- mode 
 The new width of the stream: positive for wide character, negative for byte, zero to leave unchanged. (This value is ignored.)
Return Value
This function currently just returns mode.
Remarks
The current version of this function does not comply with the Standard.
Requirements
| Function | Required header | 
|---|---|
| fwide | <wchar.h> | 
For more information, see Compatibility.