"ab" mode in fopen

[pereges]

Can I use this mode to create a new file , add some data and then
append more data ? How is it different from ab+ ?

 

[Kenneth Brody]

[Critical part of question in subject: "ab" mode in fopen]

Can I use this mode to create a new file , add some data and then
append more data ?
Yes.

How is it different from ab+ ?

"ab" is "append; open or create binary file for writing at end-of-file"
and "ab+" is "append; open or create binary file for update, writing at
end-of-file".

In other words, the difference is that "ab" is write-only, while "ab+"
is read/write.

--
+-------------------------+--------------------+-----------------------+
| Kenneth J. Brody | www.hvcomputer.com | #include |
| kenbrody/at\spamcop.net | www.fptech.com | <std_disclaimer.h> |
+-------------------------+--------------------+-----------------------+
Don't e-mail me at: <mailto:[email protected]>

 

[pereges]

[Critical part of question in subject: "ab" mode in fopen]

Can I use this mode to create a new file , add some data and then
append more data ?
Yes.

How is it different from ab+ ?

"ab" is "append; open or create binary file for writing at end-of-file"
and "ab+" is "append; open or create binary file for update, writing at
end-of-file".

In other words, the difference is that "ab" is write-only, while "ab+"
is read/write.

Then in that case, ab+ is better if you want to do write followed by
read in same function.

 

[Joachim Schmitz]

[Critical part of question in subject: "ab" mode in fopen]

Can I use this mode to create a new file , add some data and then
append more data ?
Yes.

How is it different from ab+ ?

"ab" is "append; open or create binary file for writing at
end-of-file" and "ab+" is "append; open or create binary file for
update, writing at end-of-file".

In other words, the difference is that "ab" is write-only, while
"ab+" is read/write.

Then in that case, ab+ is better if you want to do write followed by
read in same function.

replace 'better' with 'correct'

Bye, Jojo

 

[Nick Keighley]

Can I use this mode to create a new file , add some  data and then
append more data ? How is it different from ab+ ?

I think someone may have mentioned this, could please include the
subject of the post in the body of the post.

Have you considered reading the documentaion for this?
Any good C book would have answered your question.
As would google.

http://www.opengroup.org/onlinepubs/007908799/xsh/fopen.html