NSFileSize what Entity?

Question

I have a method which gives me the fileSize of a directory. I looked up in the Documentation but it's not declared which entity NSFileSize has.

What do you mean by entity? And can you provide a link to the documentation you are using? — , May 31 '12 at 08:18

score 5 · Answer 1 · edited Jun 20 '20 at 09:12

5

in NSFileManager doc:

NSFileSize

The key in a file attribute dictionary whose value indicates the file's size in bytes. The corresponding value is an NSNumber object containing an unsigned long long. Important If the file has a resource fork, the returned value does not include the size of the resource fork. Available in iOS 2.0 and later. Declared in NSFileManager.h.

edited Jun 20 '20 at 09:12

Community

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answered May 31 '12 at 08:19

meronix

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If it output my FileSize in the console it has a value of 25228 (bytes?) if I calculate the size in megabytes it outputs 25 228 bytes = 0.0240592957 megabytes but the directory in the Finder is 10MB large. – btype May 31 '12 at 08:26
@btype As I said in my answer: There's no `NSFileSize` for directories. You have to explain what you do and post code that fails. Please edit your question to clarify. – Nikolai Ruhe May 31 '12 at 09:18
well, i suppose that you get just the size of the folder (i mean the file used to store informations of the folder), and not the contents files size... – meronix May 31 '12 at 09:19

score 3 · Answer 2 · answered May 31 '12 at 08:20

NSFileSize is a key in attribute dictionaries as returned by NSFileManager's attributesOfItemAtPath:error:. The object is an NSNumber from which you can get the POD value using unsignedLongLongValue.

You don't get NSFileSize for dictionaries. What method do you mean?

score 0 · Accepted Answer · answered May 31 '12 at 15:35

I solved it myself, thanks to the hint that a directory has no FileSize. Here is my completed Code:

-(float)getSizeOfDirectory:(NSString *)directory{

    NSFileManager *filemgr;
    NSArray *filelist;
    int count;
    float cacheSize = 0;

    filemgr =[NSFileManager defaultManager];
    filelist = [filemgr contentsOfDirectoryAtPath:directory error:NULL];
    count = [filelist count];

    for (NSString *url in filelist) {
        NSData *data = [filemgr contentsAtPath:[NSString stringWithFormat:@"%@/%@",directory,url]];
        cacheSize = cacheSize + ([data length]/1000);
    }

    cacheSize = (cacheSize/1024);
    NSLog(@"cacheSize: %f MB",cacheSize);

    return cacheSize;
}

This code is not only utterly wasteful but also incorrect. [In this answer](http://stackoverflow.com/a/28660040/104790) I'm explaining why and how it could be done faster and more precisely. — Nikolai Ruhe, Sep 25 '15 at 12:11

NSFileSize what Entity?

3 Answers3