Re: NSMutableString -initWithFormat appends to existing text

[Ivan Vučica]

On 18 Apr 2018, at 09:23, Mick Bert <micbert75@gmail.com> wrote:

2018-04-18 9:52 GMT+02:00 H. Nikolaus Schaller <hns@goldelico.com>:

-init or -initWithFormat: should be called only once and only after +alloc.
You use stringWithCapacity which has already been initialized.

Use -setString:@"" followed by -appendWithFormat: instead.

Thanks a lot!
Now it works as expected.

It may, but invoking init multiple times is still a bad idea.

One question more. I am writing in a text file, by formatting NSString
objects to give to NSFileHandle -writeData.
Is it the preferable way? Are there any other class to work with
text-oriended files?

If you don’t need anything more, NSString includes writeToFile:.

What does a ‘text oriented file’ mean? You still have a format, whether that’s Windows-style INI, or JSON, or the ASCII and XML property list formats that are first-class citizens under GNUstep and similar systems? 

For portability of data to other languages, I’d say writing JSON is simplest. NSJSONSerialization is what you want.

Here’s some Apple documentation on how to do property lists under Cocoa: https://developer.apple.com/library/content/documentation/Cocoa/Conceptual/PropertyLists/ReadWritePlistData/ReadWritePlistData.html

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