In my code I'm doing:
[anNsDataObject writeToFile:#"thefile" atomically:YES];
How can I delete this file from my device?
Using NSFileManager's removeItemAtPath:error: method.
Example:
NSError *error;
[[NSFileManager defaultManager]removeItemAtPath:#"theFile" error:&error];
if (error)
{
// file deletion failed
}
Related
I am trying to download an XML file from this URL www.overpass-api.de/api/xapi?[maxspeed=][bbox=5.6283473,50.5348043,5.6285261,50.534884]
but it returns nil to NSData. My code is:
NSURL *url = [NSURL URLWithString:#"www.overpass-api.de/api/xapi?*[maxspeed=*][bbox=5.6283473,50.5348043,5.6285261,50.534884]"];
NSError *error;
NSData *urlData = [NSData dataWithContentsOfURL:url options:NSDataReadingUncached error:&error];
if (error) {
NSLog(#"%#", [error localizedDescription]);
} else {
NSLog(#"Data has loaded successfully.");
}
The error says "The file “xapi” couldn’t be opened because there is no such file."
Please help how can I download the XML returned from the URL and parse it?
Got it working! Just added http:// to the beginning of the link and it returns proper data. Wow!
I want to upload an NSString to a text file (.txt) on an ftp server.
I use the following code:
- (IBAction)Blau:(id)sender {
BlauS = #"1";
NSURL *BlauURL= [NSURL URLWithString:#"ftp://username:password#myftpserverurl/blau.txt"];
NSError *error;
BOOL proof=[BlauS writeToURL:BlauURL atomically:NO encoding:NSUTF8StringEncoding error:&Error];
if (!proof) {
NSLog(#"Error!: %#", [error localizedFailureReason]);
}
}
My log shows me the following error:
The specified URL type isn’t supported.
What's wrong? How can I fix this problem?
My app had been rejected the 2nd times and I lost 3 weeks :(
The first submit, I excluded ONLY DIRECTORIES from being backed-up in iCloud. Apple rejected...
The second submit, I excluded DIRECTORIES & PICTURES downloaded from being backed-up in iCloud. Apple again rejected... Apple also complaint that I have no "Restore" feature for my In-App purchase, while in fact, I do have a "Restore" button and it worked when I tested it.
I've done as Apple had suggested by excluding the file from being backedup using NSURLIsExcludedFromBackupKey. There was an interesting comment made by Macmade's on stackoverflow here:
sometimes Apple reviewers think your data can be re-generated, when
it's not. Then you'll have to explain why the data has to be backed-up
How often do the reviewer misunderstood and we have to explain to them that the content is required offline & not re-generateable?
Here is the code I used to exclude my files & directories from iCloud. Do you spot any problems?
- (BOOL)addSkipBackupAttributeToItemAtURL:(NSURL *)URL
{
// There's a chance the download failed, but don't assert here
//assert([[NSFileManager defaultManager] fileExistsAtPath: [URL path]]);
NSError *error = nil;
BOOL success = [URL setResourceValue:[NSNumber numberWithBool:YES]
forKey:NSURLIsExcludedFromBackupKey
error: &error];
if(!success){
NSLog(#"Error excluding %# from backup %#", [URL lastPathComponent], error);
}
return success;
}
//Download picture from Google and exclude it from being backed-up in iCloud
- (void)downloadFetcher:(GTMHTTPFetcher *)fetcher
finishedWithData:(NSData *)data
error:(NSError *)error
{
if (error == nil) {
// successfully retrieved this photo's data; save it to disk
GDataEntryPhoto *photoEntry = [fetcher propertyForKey:#"photo entry"];
// Create album directory if it doesn't already exist
NSString *path = [self findOrCreateApplicationSupportSubPath:[photoEntry albumTitle]];
path = [path stringByAppendingPathComponent:[[photoEntry title] stringValue]];
if (path != nil) {
// Write to disk
BOOL didSave = [data writeToFile:path
options:NSDataWritingAtomic
error:&error];
if (didSave) {
// Exclude file from being backed up in iCloud
NSURL *url = [NSURL fileURLWithPath:path];
BOOL excludeBackupResult = [self addSkipBackupAttributeToItemAtURL:url];
if (excludeBackupResult == NO) {
NSLog(#"Error excluding FILE from iCloud: %#", path);
}
// Update the download progress bar
_downloadedFileCounter = _downloadedFileCounter + 1;
float progress = _downloadedFileCounter / kMaleWireframeImagesTotal;
[self updateProgress:progress];
// The download completed. -2 just incase a package is lost, but let the user move on...
if (_downloadedFileCounter >= _downloadableFilesTotal -2) {
[_panel6 downloadCompleted];
}
} else {
// error saving file. Perhaps out of space? Write permissions error?
NSLog(#"Save anatomy picture failed: %#", error.localizedDescription);
}
} else {
NSLog(#"downloadFetcher: Cannot create directory");
}
} else {
NSLog(#"downloadFetcher failed: %#", error);
}
}
//Create directory and exclude it from being backed-up in iCloud
-(NSString*)findOrCreateApplicationSupportSubPath:(NSString*)subPath
{
NSString *resolvedPath;
NSArray *appSupportDir = NSSearchPathForDirectoriesInDomains(NSApplicationSupportDirectory, NSUserDomainMask, YES);
if ([appSupportDir count] != 0) {
resolvedPath = [appSupportDir objectAtIndex:0];
// Append the name of this application
NSString *executableName = [[[NSBundle mainBundle] infoDictionary] objectForKey:#"CFBundleExecutable"];
resolvedPath = [resolvedPath stringByAppendingPathComponent:executableName];
resolvedPath = [resolvedPath stringByAppendingPathComponent:subPath];
NSFileManager *manager = [NSFileManager defaultManager];
if (![manager fileExistsAtPath:resolvedPath]) {
// Path doesn't exist, creates it
NSError *error;
BOOL successful = [manager createDirectoryAtPath:resolvedPath withIntermediateDirectories:YES attributes:nil error:&error];
if(!successful) {
NSLog(#"ERROR creating APP Support Sub-Directory: %#", error.localizedDescription);
return nil;
} else {
// Exclude path from backing-up in iCloud
NSURL *url = [NSURL fileURLWithPath:resolvedPath];
BOOL excludeBackupResult = [self addSkipBackupAttributeToItemAtURL:url];
if(!excludeBackupResult){
NSLog(#"Error excluding DIRECTORY from iCloud backup. This is a violation to their guideline.");
return nil;
}
}
}
} else {
NSLog(#"No Application Support Path available");
return nil;
}
return resolvedPath;
}
I think the trick is to add the NSURLIsExcludedFromBackupKey OR make sure the directory is outside the documents directory. I did this by moving my documents to the Library/Application Support folder (since it didn't make sense in the /tmp or /Caches folders):
- (void)createNewRefFolder
{
NSError *error;
// store in /Library/Application Support/BUNDLE_IDENTIFIER/Reference
// make sure Application Support folder exists
NSURL *applicationSupportDirectory = [[NSFileManager defaultManager] URLForDirectory:NSApplicationSupportDirectory
inDomain:NSUserDomainMask
appropriateForURL:nil
create:YES
error:&error];
if (error) {
NSLog(#"KCDM: Could not create application support directory. %#", error);
}
NSURL *referenceFolder = [applicationSupportDirectory URLByAppendingPathComponent:#"Reference" isDirectory:YES];
if (![[NSFileManager defaultManager] createDirectoryAtPath:[referenceFolder path]
withIntermediateDirectories:YES
attributes:nil
error:&error]) {
NSLog(#"KCDM: Error creating Reference folder: %# ...", error);
}
BOOL success = [referenceFolder setResourceValue:#YES forKey: NSURLIsExcludedFromBackupKey error: &error];
if(!success){
NSLog(#"KCDM: Error excluding %# from backup %#", referenceFolder, error);
}
}
Little UPDATE from previous answers.
You have to check the existence of the file. Otherwise, you will get this error,
Error excluding [FileName] from backup:
Error Domain=NSCocoaErrorDomain Code=4 "The file “[FileName]” doesn’t exist."
...
I am not sure if we should check for the value is already updated or not.
e.g. if the API reset already set value or not. If it tries to update the file system again for a set value that is more time consuming, I guess.
Updated method...
+ (BOOL)addSkipBackupAttributeToURLAtPath:(NSURL *)url
{
if (!url) return NO;
if (![[NSFileManager defaultManager] fileExistsAtPath:url.path]) return NO;
NSError *error = nil;
NSNumber *value = nil;
BOOL success = [url getResourceValue:&value forKey:NSURLIsExcludedFromBackupKey error:&error];
if (value.boolValue == YES) return YES;
success = [url setResourceValue:[NSNumber numberWithBool:YES]
forKey:NSURLIsExcludedFromBackupKey error:&error];
if(!success){
NSLog(#"Error excluding %# from backup: %#", [url lastPathComponent], error);
}
return success;
}
+ (BOOL)addSkipBackupAttributeToFileAtPath:(NSString *)path
{
if (!path) return NO;
return [self addSkipBackupAttributeToURLAtPath:[NSURL fileURLWithPath:path]];
}
This question already has answers here:
Cocoa - NSFileManager removeItemAtPath Not Working
(6 answers)
Closed 9 years ago.
i am trying to delete a file at a particular URL,
my code iS :
NSString *str= [outputFieldURL absoluteString];
NSError *error;
BOOL success = [[NSFileManager defaultManager] removeItemAtPath:str error:&error];
if (!success) {
NSLog(#"Error removing file at path: %#", error.localizedDescription);
}
else
{
NSLog(#"File removed at path: %#", error.localizedDescription);
}
}
and am getting output :
Error removing file at path: The operation couldn’t be completed. (Cocoa error 4.)
where outputFieldURL is showing following value when i convert it into a string :
file:///var/mobile/Applications/A55A56FA-478D-4996-807D-12F0E968F969/Documents/301013125211w.m4a
this is the path where my audio with a format of .m4a is saved
Your path is incorrect
Use the following
NSString *str= [outputFieldURL path];
in place 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:"
There may be case that file path which you provide is not correct. If its correct then try following with URL, it might solve your issue
NSString *str= [outputFieldURL absoluteString];
NSError *error;
NSURL *url = [NSURL URLWithString:str];
BOOL success = [[NSFileManager defaultManager] removeItemAtURL:url error:&error];
if (!success) {
NSLog(#"Error removing file at path: %#", error.localizedDescription);
}
else
{
NSLog(#"File removed at path: %#", error.localizedDescription);
}
}
I'm having trouble synching a simple textfile, I get this error when trying to open it:
{NSFilePath=/private/var/mobile/Library/Mobile Documents/4C224W52W5~com~piso13~opusDomini/currentLogPath, NSUnderlyingError=0xde9b460 "The operation couldn’t be completed. Bad file descriptor"}
This is how I create it
-(BOOL)createLogFolderFile{
NSString *uuid = nil;
CFUUIDRef uuidRef = CFUUIDCreate(nil);
uuid = (NSString*)CFUUIDCreateString(nil, uuidRef);
CFRelease(uuidRef);
NSError *error = nil;
[uuid writeToFile:[self filePath] atomically:NO encoding:NSUTF8StringEncoding error:&error];
if (error) {
NSLog(#"Error trying to create log file %#", error);
return FALSE;
}
else{
return TRUE;
}
}
-(NSString*)filePath{
NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *iCloudPath = [[fileManager URLForUbiquityContainerIdentifier:nil] path];
return [iCloudPath stringByAppendingPathComponent:LOG_FOLDER_FILE_NAME];
}
This is how I read it:
-(NSString*)readLogFolderFromFile{
NSError *error = nil;
NSString *logFolder = [NSString stringWithContentsOfFile:[self filePath] encoding:NSUTF8StringEncoding error:&error];
if (error) {
NSLog(#"Error when trying to read log folder from file: %#" ,error);
return nil;
}
else{
return logFolder;
}
}
I'm using NSMetadataQuery to search for the file,
The notification query finish gathering info results positive.
Help?
The file was not downloaded. It seems NSMetadataQuery notifies about the existence of the file in the cloud. To actually get the file, extra code is needed:
Inside queryDidFinishGathering notification:
NSMetadataItem *item = [query resultAtIndex:0];
self.metadataItem = item;
BOOL isDownloaded = [[item valueForAttribute:NSMetadataUbiquitousItemIsDownloadedKey]boolValue];
if (!isDownloaded) {
NSError *error = nil;
[[NSFileManager defaultManager] startDownloadingUbiquitousItemAtURL: [item valueForAttribute:NSMetadataItemURLKey] error:&error];
NSLog(#"Start downloading file");
if (error) {
NSLog(#"Error trying to download file: %#", error);
}
else{
[self lookForLogFolderFile];
return;
}
}
The lookForLogFolderFile simply starts the query again.
After several calls my item gets downloaded. You can also use a timer to between each call to start a NSMetadataQuery. In my case, is just a text file with one line.