CODEWITHSUNDEEP
objective-ccocoaxcodemacosnsfilemanager
lab12
lab12

Reputation: 6448

Cocoa - NSFileManager removeItemAtPath Not Working

I am trying to delete a file, but somehow nsfilemanager will not allow me to do so. I do use the file in one line of code, but once that action has been ran, I want the file deleted. I have logged the error code and message and I get error code: 4 and the message:

"text.txt" could not be removed

Is there a way to fix this error "cleanly" (without any hacks) so that apple will accept this app onto their Mac App Store?

EDIT:

This is what I am using:

[[NSFileManager defaultManager] removeItemAtPath:filePath error:NULL];

Thanks,

kevin

Upvotes: 4

Views: 25172

Answers (6)

jordiz
jordiz

Reputation: 289

Default method AFNetworking 3.0 don't refresh that you downloader files.

If you want rewrite this file in Objective-C +iOS9.0, you need do that:

- (NSURLSessionDownloadTask *) downloadDocsFromUrl:(NSString *) url withSuccesBlock:(DocModelBlock) docModelBlock withErrorBlock:(ErrorBlock) errorBlock {

    NSURL *URL = [NSURL URLWithString:url];
    NSURLRequest *request = [NSURLRequest requestWithURL:URL];

    NSURLSessionDownloadTask *downloadTask = [self.sessionManager downloadTaskWithRequest:request progress:nil destination:^NSURL *(NSURL *targetPath, NSURLResponse *response) {

        NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *)response;
        NSFileManager *fileManager = [NSFileManager defaultManager];
        NSError *error;

        NSURL *documentsDirectoryURL = [fileManager URLForDirectory:NSDocumentDirectory inDomain:NSUserDomainMask appropriateForURL:nil create:NO error:&error];

        if ([httpResponse statusCode] == 200) {
            NSURL *urlPath = [documentsDirectoryURL URLByAppendingPathComponent:[response suggestedFilename]];

            if ([fileManager fileExistsAtPath:urlPath.path]) {
                [fileManager removeItemAtPath:urlPath.path error:&error];
            }
        }

        return [documentsDirectoryURL URLByAppendingPathComponent:[response suggestedFilename]];
    } completionHandler:^(NSURLResponse *response, NSURL *filePath, NSError *error) {
        if (error) {
            errorBlock(error);
        } else {
            docModelBlock(filePath);
        }
    }];
    [downloadTask resume];

    return downloadTask;
}

Upvotes: 0

Jean-Philippe
Jean-Philippe

Reputation: 41

I just figure it out of something very important when you use NSFileManager. You have to be aware of App Sandboxing. 

let documentDirectory = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, .UserDomainMask, true)[0]

This line return the path document directory of your app sandboxed. When you create a file with FileManager in your document directory (for e.g) don't save the full file path but only the path from the current document directory.

You'll be able to recreate the full path of your created file.

Hope (after 5 years) help over developers ;-)

Upvotes: 0

Ilker Baltaci
Ilker Baltaci

Reputation: 11779

I had a similar problem in swift.For some reason fileManager.removeItemAtPath did't work and I changed fileManager.removeItemAtPath(filePath) to fileManager.removeItemAtURL(fileURL) and it works fine.

    let fileManager = NSFileManager()
    let documentsFolderUrl = fileManager.URLForDirectory(.DocumentDirectory, inDomain: .UserDomainMask, appropriateForURL: nil, create: false, error: nil)

    let soundURL = documentsFolderUrl!.URLByAppendingPathComponent(recording.path)
    let stringTrimmedFilePath = "trimmed_\(recording.path)"
    let trimmedSoundURL = documentsFolderUrl!.URLByAppendingPathComponent(stringTrimmedFilePath)
    var error: NSError?
    fileManager.removeItemAtURL(trimmedSoundURL, error: &error)

Upvotes: 3

Jasmeet
Jasmeet

Reputation: 1531

Your path is incorrect

Use the following

NSString *str = [outputFieldURL path];

instead of

NSString *str = [outputFieldURL absoluteString];

The method "removeItemAtPath:" need the local path of file, If you want to remove using url, you should use -removeItemAtURL:

Upvotes: 2

JeremyP
JeremyP

Reputation: 86651

Error code 4 seems to be NSNoSuchFileError. If the file you want to delete really exists, then you have got the path wrong. You'll need to post some code if you want us to tell you exactly how you got the path wrong.

If the file doesn't exist, you can ignore the error.

Upvotes: 13

Ishu
Ishu

Reputation: 12787

First you need to pick the path for the document directory then you can delete the file. Only remove statement is not sufficient.

   NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
        NSString *documentsDirectoryPath = [paths objectAtIndex:0];

    NSString *databaseFile = [documentsDirectoryPath stringByAppendingPathComponent:@"text.txt"];

    NSFileManager *fileManager = [NSFileManager defaultManager];
    [fileManager removeItemAtPath:databaseFile error:NULL];

use this for solving your problem.

Upvotes: 2

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