VistaIOOpenFile(3)

NAME
VistaIOOpenInputFile, VistaIOOpenOutputFile - open file with error checking

SYNOPSIS
#include <vistaio.h>

FILE *VistaIOOpenInputFile (VistaIOStringConst filename, VistaIOBoolean nofail);

FILE *VistaIOOpenOutputFile (VistaIOStringConst filename, VistaIOBoolean nofail);

ARGUMENTS

filename
    Specifies he name of the file to be opened.

nofail
    Specifies whether the routine should exit the program if the file cannot be opened.

DESCRIPTION
These routines open a file while checking for failure and recognizing the special filename ``-'' as denoting the standard input or output stream.

If filename is NULL or it is the string ``-'', either stdin or stdout is returned. Otherwise, an attempt is made to open the named file for either reading or writing, as appropriate. If the attempt is successful, the resulting file pointer is returned.

The nofail argument determines what happens if a file cannot be opened. If nofail is FALSE then a warning message is issued and NULL is returned. If nofail is TRUE then a fatal error message is issued and the program is terminated.

RETURN VALUES
Either routing returns a pointer to the opened FILE if successful. Otherwise it returns NULL or doesn't return at all (depending on nofail).

SEE ALSO
VistaIOIdentifyFiles(3), VistaIOReadObjects(3), VistaIOWriteObjects(3),

DIAGNOSTICS

``Unable to open input/output file filename.''

AUTHOR
Art Pope <pope@cs.ubc.ca> Adaption to vistaio: Gert Wollny <gw.fossdev@gmail.com>