NSString Encoding Chinese text

Question

Giordano OP

Created Jun ’16

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Hello everybody,

My problem is the following.

In my app I need to save text files and this should also work for chinese text.

To do that I save the text file making use of NSUTF8StringEncoding with the following instruction:

[gameFile writeToFile:_path atomically:YES encoding:NSUTF8StringEncoding error:&error];

This works fine!

The problem is when I have to read the file. I don't read the file completely but I scan each line and I read each line using NSUTF8StringEncoding.

If I read a normal file (medium size) all is ok, but if I read a big file (about 9MB) I have the following error:

Error Domain=NSCocoaErrorDomain Code=261 "The file “KingBaseLite.txt” couldn’t be opened using text encoding Unicode (UTF-8)." UserInfo={NSFilePath=/Users/giordanovicoli/Library/Developer/CoreSimulator/Devices/8BEEEF25-620C-4B29-BD4A-E31B3C169E05/data/Containers/Data/Application/D0394678-DCCC-4D3E-8F9F-3B8685C80625/Documents/KingBaseLite.txt, NSStringEncoding=4}

If I read the same file with the following encoding: NSISOLatin1StringEncoding the file is read correctly but with this encoding I am not able to read chinese text.

I hope I was clear in my explanation.

Please, is there someone able to solve this problem?

Many thanks and regards,

Giordano

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Answer 1

QuinceyMorris OP

Jun ’16

>> I don't read the file completely but I scan each line and I read each line using NSUTF8StringEncoding.

You'll need to explain this a bit more completely. The error message suggests that you are trying to read the file completely, and then (perhaps) you're decoding it line by line.

So, what API are you using to read some or all of the file? What API are you using to break the file into lines?

Note that scanning raw UTF-8 for CR and/or LF values isn't going to work for Chinese, since these values might occur within multi-byte sequences representing other characters.

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