File Lock Check

khajalid's Avatar, Join Date: Mar 2009
Go4Expert Member
I m making an project in which i have to access a file from from 2 programs. One program is in vc++ and other in php.In this i need to lock the file when one of the program is using it.So, when php is using the file, file get locked but if in the mean time when file is locked if vc++ needs to access it it must check whether the file is already been locked or not. so how to check for it using vc++.

-regards.
Ankush Gupta.
0
shabbir's Avatar, Join Date: Jul 2004
Go4Expert Founder
Use the Opening Flags for Exclusive Read/Write permission
0
khajalid's Avatar, Join Date: Mar 2009
Go4Expert Member
I m a student so can u tell me How to implement that?
0
shabbir's Avatar, Join Date: Jul 2004
Go4Expert Founder
Read / Write files have the needed modes for that and see the File opening API in both.

How you are trying to read the file in both and I would tell you the modes.
0
khajalid's Avatar, Join Date: Mar 2009
Go4Expert Member
i m implementing it as
fp=fopen("login.txt","r");
0
shabbir's Avatar, Join Date: Jul 2004
Go4Expert Founder
I assume you are mentioning this in PHP and try using this flock API . ( http://in.php.net/flock )

For C++ also let me know the API you are using ?
0
khajalid's Avatar, Join Date: Mar 2009
Go4Expert Member
no, it is in c and i need to check the lock through c which was implemented by php.
0
khajalid's Avatar, Join Date: Mar 2009
Go4Expert Member
Also i need to lock file through c after checking if it is unlocked.
i have nthg to do with php.i is not my nwork.
0
shabbir's Avatar, Join Date: Jul 2004
Go4Expert Founder
If you are using Linux you can do is change the chmod of the file to the needed values so others can only access it as per your permission set.

If you are using Windows then try using _open function