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Asked: 2026-06-04T11:10:50+00:00

How to determine string encoding in cocoa? Recently I’m working on a radio player.Sometimes

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How to determine string encoding in cocoa?
Recently I’m working on a radio player.Sometimes id3 tag text was garbled.

Here is my code:

CFDictionaryRef audioInfoDictionary;
UInt32 size = sizeof(audioInfoDictionary);
result = AudioFileGetProperty(fileID, kAudioFilePropertyInfoDictionary, &size, &audioInfoDictionary);

ID3 info are in audioInfoDictionary. Sometimes the id3 doesn’t use utf8 encoding, and title, artist name were garbled.

Is there any way to determine what encoding a string use?

Special thx!

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1 Answer

  1. Editorial Team

    While it’s an NSString object, there’s no specific encoding since it’s guaranteed to represent whatever is put into it using the encoding determined when it was created. See the Working With Encodings section of the docs.

    From where are you getting the ID3 tags? The time you “receive” this information is the best time to determine its encoding. See Creating and Initializing Strings and the next few sections (for file and url creation) for a list of initializers. Some of them let you set the encoding and others pass back (by reference) the “best guess” encoding the system determined when creating the string. Look for methods with “usedEncoding:” for the system’s reported guess.

    All of this really depends on exactly what is handing you that string. Are you reading it from a file (an MP3) or a web service (Internet Radio)? If the latter, the server’s response should include the encoding and if that’s wrong, there’s not much to do but guess.

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