S
sword
How can I check whether a file exists?
I
Ivan Vecerina
: How can I check whether a file exists?
You'll get the same answer here as in the C NG
The portable way to check for this is to try to open
the file (you may use ifstream, or fopen as in C)
to check if it succeeds, then close it immediately.
Two main issues are:
- various operating systems may have various
restrictions on visibility or accessibility
of files within a given storage/directory.
- on a multitasking OS, a file that exists
at a given time may be deleted by the next
statement.
So in general, best is to just try to use the file,
and report the error at that point.
hth-Ivan
You'll get the same answer here as in the C NG
The portable way to check for this is to try to open
the file (you may use ifstream, or fopen as in C)
to check if it succeeds, then close it immediately.
Two main issues are:
- various operating systems may have various
restrictions on visibility or accessibility
of files within a given storage/directory.
- on a multitasking OS, a file that exists
at a given time may be deleted by the next
statement.
So in general, best is to just try to use the file,
and report the error at that point.
hth-Ivan
B
Bruintje Beer
sword said:
man access
John
S
sword
Thanks
J
Jakob Bieling
Bruintje Beer said:
Are you aware of the fact this will not lead to any solution to the
problem at all in many cases?
M
Moonlit
Hi,
On most platforms there is a function called fstat, stat and lstat that uses
a filename, or descriptor and lets you check for various stuff about a file
(I believe it returns
'-1' if a file doesn't exist) Available on linux, solaris, windows, dec and
probably many more.
--
Regards, Ron AF Greve
http://moonlit.xs4all.nl
On most platforms there is a function called fstat, stat and lstat that uses
a filename, or descriptor and lets you check for various stuff about a file
(I believe it returns
'-1' if a file doesn't exist) Available on linux, solaris, windows, dec and
probably many more.
--
Regards, Ron AF Greve
http://moonlit.xs4all.nl