Dear reader,

I have created a program that creates a document of gamekeys that must be used at registration. Giving a wrong key results in an error and you can thus not register (in the MMO source).

Currently, I'm using files (instead of a database) to read the gamekeys.
Gamekeys.txt:

I have a question regarding this implementation:

When multiple people are registering at the exact same time (with different keys), then there should be no problem, as it is only reading the file.

However, keys can be re-used again with this method. So in order to solve this problem, I want to delete the line or modify the line. (Thus now the actions are read AND write).

Intuition tells me that if multiple people register at the same time, there will be a conflict: multiple writings to file at the same time.

Is there any way around this without using a database?


(
For the interested reader: removing a line in a text file is really simple; you create a second file in which you copy everything except the used line. Next, you delete the original file (without the line), and rename the temporary file back to the original file name.
)

you can use SafeOverwrite it atomically replaces the file
or
you can use SQLite database, it's small and efficient, doesn't require any installation

I see you were already 1 step ahead of me with the SafeOverwrite function. It's just like the creation of a temporary file I see.

Thanks!