[02/03] Delete Lines from a file without writing a new file -
Hello everyone! I am new to these forums. Before posting, I searched through the threads to see if someone had a problem like I did, but I had no luck. If i post something that someone else already asked about I apologize...Anyways to my question.
I am working on a port security application that needs to use a lot of file manipulation like Reading/Writing, etc, but I can't seem to find any good examples of how to delete a line from a text file without writing a new file or to the same file. Here is some general information about the application:
The first application monitors "real time log file" for port security shutdowns and writes those lines to a another text file named (portsecurity.txt) based on a "keyword(s)". That works great.
The next application reads each line from (portsecurity.txt), uses reg exp to find specific words like an "IP address" and a "port number" and adds those to list box on the client interface. This works! The first thing I noticed is sometimes the same line gets copied twice, because the same port was shutdown. To avoid duplicate IP addresses and ports being placed in the listbox, I used an array to avoid the duplication. That works...
Now the tricky part. I want to remove those duplicate lines from portsecurity.txt file, but since the 1st application writes to portsecurity.txt constantly, I am not sure how to remove the duplicate lines without changing the file... i.e. read all lines in, delete portsecurity.txt, then write a new portsecurity.txt with the lines that I want.
In addition, this problem will haunt me later on...because once a user enables a port, the IP address and port will be removed from the listbox and the line that pertains to that IP address and port in portsecurity.txt will need to be removed. Hopefully I can knock out two birds with one stone.
Any suggestions on how I can do this, or is there a way to delete a line once it is read in on a streamreader without using a streamwriter?
Before messing around with files like this, I was going to use a SNMP manager, but I could not find a free library...and I wanted to avoid extra overhead.
Thanks in advance,
Mike
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2
3
4
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[02/03] Delete Lines from a file without writing a new file -
Hello everyone! I am new to these forums. Before posting, I searched through the threads to see if someone had a problem like I did, but I had no luck. If i post something that someone else already asked about I apologize...Anyways to my question.
I am working on a port security
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