Hi, I wanted to know if I'm doing file i/o the right way in one of my apps.
I'm writing a small helper class for one of my applications which is supposed to store data, in the form of key-value pairs, in a file. This is very similar to QSettings but w/o any fancy groups/sections that it provides. So lets assume that I have to use a file based approach only! :) It provides 2 functions - get(key) and a set(key, value) and they behave exactly like QMaps equivalent functions, i.e if the key exists, it'll overwrite the value, else it'll add a new entry. This class takes either a filename as input or a QFile itself. Assumptions:There won't be much data written to the file (max 1-2 KB). The set function will not be called very often (probably once or twice in the lifetime of the app). The get fxn will be called a little more often. Here's what I do in the 2 functions (skipping error condition checks keep it simple): get(key): * Open the file in Read-Only mode. * Parse the data and prepare a QMap of the key-value pairs. * Close the file * Return the value for the key set(key, value): * Open the file in Read-Only mode. * Parse the data and prepare a QMap of the key-value pairs. * Close the file * Open the file in Write-Only & Truncate mode * Insert the new key-value in the map * Write the map * Close the file In the set function I'm opening the file twice - once to read it's content and prepare the map and next I open it in truncate mode as I want to wipe off the existing data and write the new data afresh. Is there a simpler way to achieve what I'm doing with a file? I'm assuming the 2 open-close calls in set() are ok as it won't be called very often. Thoughts? Thanks, -mandeep
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