CODEWITHSUNDEEP
objective-ccocoa
Zekareisoujin
Zekareisoujin

Reputation: 465

Get list of files with specific extensions at a specified path in Objective-C

I'm pretty new to Objective-C. I'm developing a Cocoa application. Currently I'm looking for the equivalent of this C# code in Objective C:

string[] fileList = Directory.GetFiles(DownloadPath, "*.jpg");

The returned strings need not necessarily be full path, since all I need is the file names. I have tried NSFileManager but so far no good yet. Thank you.

EDIT: What I've tried with NSFileManager:

[someFileManager contentsOfDirectoryAtPath:path error:nil];

I also want to ask: what is the format of 'path'? This sounds easy, but I'm completely clueless about MAC OS file system. The path that I'm using is from [NSOpenPanel URLs], and they looks like this:

file://localhost/Users/alex/Movies/

Sometimes I get the results, but some other time The returned NSArray is just empty. I'm pretty confused about this so any help would be appreciated.

EDIT2: The answer here: NSPredicate endswith multiple files, is probably a better choice. Nevertheless, thank you for your answer.

Upvotes: 25

Views: 22574

Answers (3)

Trident
Trident

Reputation: 832

In fact you need some thing like this 

NSArray *dirFiles = [fileManager contentsOfDirectoryAtURL:[NSURL fileURLWithPath:documentsDir] includingPropertiesForKeys:[NSArray array] options:0 error:nil] ;
NSArray *filteredFiles = [dirFiles filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"self.absoluteString ENDSWITH '.jpg'"]] ;

Because contentsOfDirectoryAtURL: returns array of NSURL's, so using just "self ENDSWITH '.jpg'" will crash.

Upvotes: 4

mirswith
mirswith

Reputation: 1345

maybe something along these lines:

NSFileManager * fileMan = [[NSFileManager alloc] init];
NSArray * files = [fileMan contentsOfDirectoryAtPath:@"mypath/blah" error:nil]; 

if (files) 
{
    for(int index=0;index<files.count;index++)
    {
        NSString * file = [files objectAtIndex:index];

        if( [[file pathExtension] compare: @"jpg"] == NSOrderedSame )
        {
            // do something with files that end with .jpg
        }
    }
}

[fileMan release];

Upvotes: 3

VenoMKO
VenoMKO

Reputation: 3294

This code should work:

NSArray *dirFiles = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:path error:nil];
NSArray *jpgFiles = [dirFiles filteredArrayUsingPredicate:[NSPredicate predicateWithFormat:@"self ENDSWITH '.jpg'"]];

Upvotes: 50

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