I'm new to iOS development, and working on an app that support Dropbox sync for text files.
Having followed tutorial on Dropbox site but I'm not be able to check if a file is exist.
As implemented:
NSString *dropboxFileExtension;
switch ([[NSUserDefaults standardUserDefaults] integerForKey:kFileExtension]) {
case txt:
dropboxFileExtension = [NSString stringWithFormat:#"%#.txt", titleString];
break;
case md:
dropboxFileExtension = [NSString stringWithFormat:#"%#.md", titleString];
break;
case markdown:
dropboxFileExtension = [NSString stringWithFormat:#"%#.markdown", titleString];
break;
default:
break;
}
DBPath *newPath = [[DBPath root] childPath:[NSString stringWithFormat:#"%#", dropboxFileExtension]];
DBFile *file = [[DBFilesystem sharedFilesystem] createFile:newPath error:nil];
[file writeString:self.note.contents error:nil];
If I update its contents, this will throws an error that file is exists.
So how can I check that file is exists and then perform appropriate action like overwriting file or updating file. Thank you!
EDIT / Working Solution: Logically, I just have to check whether if file info exists using DBFileInfo class (1). If (1) true -> we call openFile:error before writeString:error, else call createFile:error. As suggested by #rmaddy.
So...
DBPath *newPath = [[DBPath root] childPath:[NSString stringWithFormat:#"%#", dropboxFileExtension]];
DBError *error = nil;
DBFileInfo *info = [[DBFilesystem sharedFilesystem] fileInfoForPath:newPath error:&error];
if (info) {
// file exists
NSLog(#"size %lli byte(s), modified dated %#", info.size, info.modifiedTime);
_file = [[DBFilesystem sharedFilesystem] openFile:newPath
error:nil];
} else {
_file = [[DBFilesystem sharedFilesystem] createFile:newPath
error:nil];
}
[_file writeString:self.note.contents error:nil];
Try getting the DBFileInfo for the path:
DBError *error = nil;
DBFileInfo *info = [[DBFileSystem sharedFileSystem] fileInfoForPath:newPath error:&error];
if (info) {
// file exists
}
Related
I am using UIDocumentPickerViewController to allow the user to select files that will be "attached" and available within the App. The concept is allow the user to send detail via email with the selected file attachments.
As each file is attached, I copy the file from the tmp Inbox (where fileManager puts the imported file) to a directory I create within the App document directory called "fileAttachments".
I list the files in a UITableView and the user can select each entry and preview the content within a QLPreviewController view using the path stored in the file object fileOJ.filePath.
It all works swimmingly well, until a reload of the project down to my test iPad, then all the files seem to disappear. My list of the files is still fine, but there is no file at the path location.
Any help with just what is happenning would be greatly appreciated.
- (IBAction)selectFilesAction:(UIBarButtonItem *)sender {
NSArray *UTIs = [NSArray arrayWithObjects:#"public.data", nil];
[self openFilePicker:UTIs];
}
- (void)openFilePicker:(NSArray *)UTIs {
UIDocumentPickerViewController *documentPicker = [[UIDocumentPickerViewController alloc] initWithDocumentTypes:UTIs inMode:UIDocumentPickerModeImport];
documentPicker.delegate = self;
documentPicker.allowsMultipleSelection = FALSE;
documentPicker.popoverPresentationController.barButtonItem = self.selectFilesButton;
[self presentViewController:documentPicker animated:TRUE completion:nil];
}
- (void)documentPicker:(UIDocumentPickerViewController *)controller didPickDocumentsAtURLs:(NSArray <NSURL *>*)urls {
NSLog(#"picked URLs %#", urls);
// selecting multiple documents is cool, but requires iOS 11
for (NSURL *documentURL in urls) {
//get file details
NSDictionary *attr = [documentURL resourceValuesForKeys:#[NSURLFileSizeKey,NSURLCreationDateKey] error:nil];
NSLog(#"object: %#", attr);
NSNumber *fileSize = [attr valueForKey:NSURLFileSizeKey];
NSDate *dateFileCreated = [attr valueForKey:NSURLCreationDateKey];
NSDateFormatter *storageDateFormat = [[NSDateFormatter alloc] init];
[storageDateFormat setDateFormat:#"yyyy-MM-dd HH:mm:ss"];
NSString *createdDateString = [storageDateFormat stringFromDate:dateFileCreated];
MMfile *fileObj = [[MMfile alloc]init];
fileObj.fileName = documentURL.lastPathComponent;
fileObj.meetingID = _meetingID;
fileObj.fileSize = fileSize;
fileObj.fileCreateDate = createdDateString;
//move file to new directory
fileObj.filePath = [self movefile:documentURL.lastPathComponent sourceFilePath:documentURL.path directory:#"fileAttachments"];
//save file details
[self.meetingModel saveFile:fileObj];
//refresh array and reload table
self.fileArray = [self.meetingModel getFiles:self.meetingID];
[self.tableView reloadData];
}
}
- (void)documentPickerWasCancelled:(UIDocumentPickerViewController *)controller {
NSLog(#"cancelled");
}
-(NSString *)movefile:(NSString *)filename sourceFilePath:(NSString *)sourcePath directory:(NSString *)directoryName{
// Move file from tmp Inbox to the destination directory
BOOL isDir;
NSError *error;
NSFileManager *fileManager= [NSFileManager defaultManager];
//get directory path
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
NSString* directoryPath;
if (paths>0) {
NSString *documentsDirectory = [paths objectAtIndex:0];
directoryPath = [NSString stringWithFormat:#"%#/%#",documentsDirectory,directoryName];
}
if(![fileManager fileExistsAtPath:directoryPath isDirectory:&isDir])
if(![fileManager createDirectoryAtPath:directoryPath withIntermediateDirectories:NO attributes:nil error:NULL])
NSLog(#"Error: Create folder failed %#", directoryPath);
NSString *destinationPath = [NSString stringWithFormat:#"%#/%#",directoryPath,filename];;
BOOL success = [fileManager moveItemAtPath:sourcePath toPath:destinationPath error:&error];
if (success) {
NSLog(#"moved file");
}else{
NSLog(#"error %#",error.description);
}
return destinationPath;
}
Found the issue. When the project is rebuilt and downloaded to the iPad the AppID changes, and as the documents path includes the AppID, so the documents path changes. Key is not to save the file path, only the file name and rebuild the path each instance. After having found the issue, I now see other similar posts I didn't find earlier. Also see Document directory path change when rebuild application
I am develop a add blocker app, so i want to add json file in my ActionRequestHandler class from document directory. In ActionRequestHandler class already have code that add blockerList.json which is in main bundle
actually main problem is this if i edit in blockerList.json then its not editable because of permission because this file is in main bundle so aap don't provide on editing in any file.So i generate a new file in document directory which is editable but i cant add it in safari extention. here is my code
- (void)beginRequestWithExtensionContext:(NSExtensionContext *)context {
NSItemProvider *attachment;
NSString *contentOfURL;
NSString *documentsFilePath = [self grabFilePath:#"Block.json"];
NSURL *documentsURL = [NSURL fileURLWithPath:documentsFilePath];
if ([documentsFilePath length] != 0) {
NSError *error;
// NSURL *url = [NSURL URLWithString:APP_DEFAULT_BLOCKS_URL];//[[NSURL alloc] initWithString:APP_DEFAULT_BLOCKS_URL]
contentOfURL = [NSString stringWithContentsOfURL:documentsURL encoding:NSUTF8StringEncoding error:&error];
if (error)
NSLog(#"Error reading remote json file: %#", error.localizedDescription);
}
if (contentOfURL != (id)[NSNull null] && contentOfURL.length != 0) {
attachment = [[NSItemProvider alloc] initWithItem:contentOfURL typeIdentifier:#"public.json"];
} else {
NSLog(#"URL not defined or accessible - using local JSON");
attachment = [[NSItemProvider alloc] initWithContentsOfURL:[[NSBundle mainBundle] URLForResource:#"blockerList" withExtension:#"json"]];
}
NSExtensionItem *item = [[NSExtensionItem alloc] init];
item.attachments = #[attachment];
[context completeRequestReturningItems:#[item] completionHandler:nil];
}
- (NSString *)grabFilePath:(NSString *)fileName {
NSString *filePath = [[NSString alloc]initWithFormat:#"Documents/%#", fileName];
NSString *documentsFilePath = [NSHomeDirectory()stringByAppendingPathComponent:filePath];
return documentsFilePath;
}
Building for iOS 7+ ,
Building on Xcode 6.1 ,
Using Amazon SDK AWSiOSSDKv2 2.0.12 ,
Testing on iPhone 5s and iPad 2
I am downloading images from my Amazon S3 bucket with the Amazon SDK for iOS.
The downloading is working fine but I want to use the ifModifiedSince property to retrieve only images that have been modified since a certain date
(see http://docs.aws.amazon.com/AWSiOSSDK/latest/Classes/AWSS3GetObjectRequest.html#//api/name/ifModifiedSince )
However, this is not working. Even when I specify a ifModifiedSince date that is LATER THAN the modified date of the file on S3, the file is returned.
According to the Amazon documentation:
ifModifiedSince -
Return the object only if it has been modified since the specified
time, otherwise return a 304 (not modified).
So I am not sure if I am doing something wrong or Amazon has a bug in the SDK.
Here is my code:
-(void)downloadPhotoWithName:(NSString*)name completed:(retrievedImage)completed {
NSFileManager *manager = [NSFileManager defaultManager];
NSArray *cachePaths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSString *cacheDirectory = [cachePaths firstObject];
NSString *filename = [NSString stringWithFormat:#"%#.jpg", name];
NSString *filePath = [cacheDirectory stringByAppendingPathComponent:filename];
AWSS3 *transferManager = [AWSS3 defaultS3];
AWSS3GetObjectRequest *profilePhoto = [[AWSS3GetObjectRequest alloc] init];
profilePhoto.bucket = S3BUCKETNAMEIMAGE;
profilePhoto.key = filename;
if ([manager fileExistsAtPath:filePath isDirectory:NULL]) {
NSDictionary *att = [manager attributesOfItemAtPath:filePath error:nil];
if (att) {
//Get the date of when the file was modified so we can request to retrieve
//the file only if it was modified SINCE that date
NSDate *modifiedDate = [att objectForKey:NSFileModificationDate];
if (modifiedDate) {
profilePhoto.ifModifiedSince = modifiedDate;
}
}
}
[[transferManager getObject:profilePhoto] continueWithBlock:^id(BFTask *task) {
//If it was working we should get a 304 not the image file
if (task.result) {
AWSS3GetObjectOutput *output = (AWSS3GetObjectOutput*)task.result;
NSData *imageData = (NSData*)output.body;
if (imageData) {
NSDictionary* attr = [NSDictionary dictionaryWithObjectsAndKeys:output.lastModified, NSFileModificationDate, NULL];
//The log confirms that the date I am passing for ifModifiedSince is LATER THAN
//the last modified date of the file on S3
//but the the image file is returned anyway.. is it a problem with Amazon ?
NSLog(#"output.lastModified: %#\nmodifiedDate: %#", output.lastModified, profilePhoto.ifModifiedSince);
if ([manager createFileAtPath:filePath contents:imageData attributes:attr]) {
completed(imageData);
}
else {
NSLog(#"Could not save image to disk for some reason");
completed(nil);
}
}
else {
completed(nil);
}
}
else if (task.error) {
NSLog(#"DownloadPhotoError: %#", task.error);
completed(nil);
}
return nil;
}];
}
We've released the AWS Mobile SDK for iOS 2.0.14. It should address the time formatting issue.
Below is the code I have written to change the name of any file stored in an iOS device "Documents" directory.
When renaming the file using this code, the prefix resolves to...
"file:/localhost/private/var/mobile/Applications/.../Documents/"
instead of the correctly formatted...
"file://localhost/private/var/mobile/Applications/.../Documents/"
I am losing a slash, and so the rename method fails!!!
I have rewritten this for both NSString and NSURL formats, and both methods present the identical error. I have tested this using the iOS Simulator and on device, and both tests present the identical error.
I suspect I am overlooking something simple, but cannot figure what it is - any help please?
- (void)alterFileNameOrExtension {
NSError *errorMove = nil;
NSError __autoreleasing *error = nil;
//note below - entity attribute document.dStringURL has a data type NSString
NSString *file = [document.dStringURL lastPathComponent];
NSString *fileName = [file stringByDeletingPathExtension];
NSString *fileExtension = [file pathExtension];
NSString *fileNameNew = nil;
//note below - self.tempFileComponent, self.tempFileName & self.tempFileExtension
//note below - are set in the (IBAction) method textFieldDidEndEditing:
//note below - self.tempFileComponent determines whether the user is attempting to change the file name or the file extension
if (self.tempFileComponent == 1) {
fileNameNew = [[self.tempFileName stringByAppendingPathExtension:fileExtension] stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding];
} else if (self.tempFileComponent == 2) {
fileNameNew = [fileName stringByAppendingPathExtension:self.tempFileExtension];
} else {
NSLog(#"%# - %# - attempt to determine tempFileComponent has (possible undefined) E~R~R~O~R: %#_", self.className, NSStringFromSelector(_cmd), error.localizedDescription);
}
NSString *filePath = [document.dStringURL stringByDeletingLastPathComponent];
NSString *filePathNew = [filePath stringByAppendingPathComponent:fileNameNew];
BOOL move = [[NSFileManager defaultManager] moveItemAtPath:document.dStringURL toPath:filePathNew error:&errorMove];
if (!move) {
//handle error
} else {
//complete process
}
}
#
With assistance from #Mario, I have adjusted my code and include the working version below for the benefit of others...
#
NSError *errorMove = nil;
NSError __autoreleasing *error = nil;
NSString *file = [document.dStringURL lastPathComponent];
NSString *fileName = [file stringByDeletingPathExtension];
NSString *fileExtension = [file pathExtension];
NSString *fileNameNew = nil;
if (self.tempFileComponent == 1) {
fileNameNew = [self.tempFileName stringByAppendingPathExtension:fileExtension];
} else if (self.tempFileComponent == 2) {
fileNameNew = [fileName stringByAppendingPathExtension:self.tempFileExtension];
} else {
NSLog(#"%# - %# - attempt to determine tempFileComponent has (possible undefined) E~R~R~O~R: %#_", self.className, NSStringFromSelector(_cmd), error.localizedDescription);
}
NSURL *fileURLOld = [NSURL URLWithString:document.dStringURL];
NSURL *fileURLPrefix = [fileURLOld URLByDeletingLastPathComponent];
NSURL *fileURLNew = [fileURLPrefix URLByAppendingPathComponent:fileNameNew];
BOOL move = [[NSFileManager defaultManager] moveItemAtURL:fileURLOld toURL:fileURLNew error:&errorMove];
if (!move) {
//handle error
} else {
//complete process
}
The NSString path manipulation methods like stringByAppendingPathComponent expects file paths not URLs. It will remove double slashes as this is not a valid file path (although it is a valid URL).
I'm trying to play a song in my application. When the the code to play a song is put right away in the controller it runs good.
But when i put the code in a class, call the class then call the method to play the song, nothing happens ? If someone have a clue please feel free to help.
here is the code to play a song
-(void)randomSound{
NSLog(#"sound");
NSString * path;
NSError * err;
NSString *name;
NSArray *names = [[NSArray alloc] initWithObjects:#"1up.wav", #"mario02.dsp.wav", #"mario04.dsp.wav", #"mario06.dsp.wav", #"mrf.dsp.wav", nil];
name = [names randomObject];
path = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:name];
if ([[NSFileManager defaultManager] fileExistsAtPath:path]) {
NSURL * url = [NSURL fileURLWithPath:path];
self.snd = [[AVAudioPlayer alloc] initWithContentsOfURL:url
error:&err] ;
if (! self.snd) {
NSLog(#"data named '%#' had error %#", name, [err localizedDescription]);
} else {
NSLog(#"playing");
[self.snd prepareToPlay];
[self.snd play];
}
} else {
NSLog(#"data file '%#' doesn't exist at '%#'", name, path);
}
}
The way i call the method
if ([[NSUserDefaults standardUserDefaults] boolForKey:#"YAHOO"])
{
YahooViewController *YH = [[YahooViewController alloc] init];
[YH randomSound];
}
The random method in case someone would like to know whats in it
-(id)randomObject {
NSUInteger myCount = [self count];
if (myCount)
return [self objectAtIndex:arc4random_uniform(myCount)];
else
return nil;
}
After discussion in comments it was identified the issue was URL encoding.
Check out this question / answer which will show you how to URLEncode a string:
How do I URL encode a string