CODEWITHSUNDEEP
cwindowswinapitext-files
Ayse
Ayse

Reputation: 2754

Clear contents of a Text File

I am working on a sever/client applicataion. I want to maintain information of all active clients in a text file named "Information.txt". I update this text file after every 3 seonds. So, I want the text file to clear all of its contents after every 3 seconds without deleting the file. Is there any way to do it ? :( I don't want to use freopen().

Upvotes: 1

Views: 906

Answers (3)

Davide Berra
Davide Berra

Reputation: 6568

Just open the file with fopen and setting the flag to w or w+ or wb

From fopen man page

w

Truncate file to zero length or create text file for writing. The stream is positioned at the beginning of the file.

w+

Open for reading and writing. The file is created if it does not exist, otherwise it is truncated. The stream is positioned at the beginning of the file.

Upvotes: 1

Sergey Kalinichenko
Sergey Kalinichenko

Reputation: 726579

A problem with clearing the file periodically is that if your process crashes after the file has been cleared but before it has been written, you lose data: the old data is gone, but the new data is not there yet.

A common approach to this problem is to create a new file, writing it, and then moving the new file to replace the old one. This way you always have a file, and sometimes (for very brief periods of time) you have two files.

Upvotes: 3

Linga
Linga

Reputation: 10553

Try with

fopen(filename, flag)

Open your file with flag= "w" or "wb" and it will be cleared

Upvotes: 1

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