At now I save file by recording it from AVAudioUnitEQ.
[mainEQ installTapOnBus:0 bufferSize:0 format:[mainEQ outputFormatForBus:0] block:^(AVAudioPCMBuffer *buf, AVAudioTime *when){
if(!recordIsGoing){
[mainEQ removeTapOnBus:0];
}
else{
[writeAudioFile writeFromBuffer:buf error:nil];
// NSLog(#"%lld", writeAudioFile.length);
}
}];
But this method requires a prior file playback . Is there a way to save the mixed file without playing ?
UPD: I can get AUAudioUnit.outputBusses[0] to mainEQ.
The challenge now is to take out the data and hope that they will be such what I need.
RESOLVED: Issue been resolved by this answer Can I use AVAudioEngine to read from a file, process with an audio unit and write to a file, faster than real-time?
I think you can do this by first converting your data into NSData and storing it. When you retrieve it back, you can convert it back.
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:buf];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *dataPath = [documentsDirectory stringByAppendingPathComponent:#"yourfilename.dat"];
// Save it into file system
[data writeToFile:dataPath atomically:YES];
Related
I'm developing an app that provides the ability to store cloud documents.
This app will have the option to import data from other apps using the new UIDocumentPickerViewController.
Everything works fine and I'm able to show the picker view controller.
This is the code that I'm using to import the file:
- (void)documentPicker:(UIDocumentPickerViewController *)controller didPickDocumentAtURL:(NSURL *)url {
if (controller.documentPickerMode == UIDocumentPickerModeImport) {
dispatch_async(dispatch_get_main_queue(), ^{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0]; // Get documents folder
NSString* path=[NSString stringWithFormat:#"%#/MyHandyTap/%#/%#",documentsDirectory,self.cartella,[url lastPathComponent]];
BOOL startAccessingWorked = [url startAccessingSecurityScopedResource];
NSURL *ubiquityURL = [[NSFileManager defaultManager] URLForUbiquityContainerIdentifier:nil];
__block NSData *data;
NSFileCoordinator *fileCoordinator = [[NSFileCoordinator alloc] init];
NSError *error;
[fileCoordinator coordinateReadingItemAtURL:url options:0 error:&error byAccessor:^(NSURL *newURL) {
data = [NSData dataWithContentsOfURL:newURL];
[data writeToFile:path atomically:YES];
}];
[url stopAccessingSecurityScopedResource];
}
}
With this code I'm able to import a lot of different file formats (.pdf, .txt, .rtf, .doc etc) however if I try to import files .pages or .numbers files from iCloud the call to [NSData dataWithContentsOfURL:newURL] returns null.
Is it possibile to let users import these kinds of files?
I've red the documentation listed here https://developer.apple.com/library/prerelease/ios/documentation/General/Conceptual/ExtensibilityPG/FileProvider.html#//apple_ref/doc/uid/TP40014214-CH18-SW2
and I've downloaded the example listed here : https://developer.apple.com/devcenter/download.action?path=/wwdc_2014/wwdc_2014_sample_code/newboxanintroductiontoiclouddocumentenhancementsinios8.0.zip
however I'm not able to figure out how to solve this issue.
Thank you in advance for your help
Andrea
Even I did not test it, but likely you get the problems, because documents of type .pages or .numbers are no single files, but bundles. So you cannot read them with -dataWithContentsOfURL:.
Did you check copying with -copyItemAtURL:toURL:error: (NSFileManager)?
I have a Settings.plist and I want to edit some values in this file.
My function to edit/writing is:
- (void) setParamWithName: (NSString*) Name withValue: (NSString*) Value {
// get paths from root direcory
NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES);
// get documents path
NSString *documentsPath = [paths objectAtIndex:0];
// get the path to plist file
NSString *plistPath = [documentsPath stringByAppendingPathComponent:#"Settings.plist"];
// check to see if Data.plist exists in documents
if (![[NSFileManager defaultManager] fileExistsAtPath:plistPath])
{
// if not in documents, get property list from main bundle
plistPath = [[NSBundle mainBundle] pathForResource:#"Settings" ofType:#"plist"];
}
// read property list into memory as an NSData object
NSData *plistXML = [[NSFileManager defaultManager] contentsAtPath:plistPath];
NSString *errorDesc = nil;
NSPropertyListFormat format;
// convert static property list into dictionary object
NSDictionary *temp = (NSDictionary *)[NSPropertyListSerialization propertyListFromData:plistXML mutabilityOption:NSPropertyListMutableContainersAndLeaves format:&format errorDescription:&errorDesc];
if (!temp)
{
NSLog(#"Error reading plist: %#, format: %d", errorDesc, format);
}
// checking if element exists, if yes overwriting
// if element not exists adding new element
[temp writeToFile:plistPath atomically:YES];
}
This function read and write (with te same values) Settings.plist.
I do not have any idea (my knowledge about objective-c is not enough) how to add new element or edit existing element. Can anyone help mi with this issue?
I think it's easier as you think.
Once you got the path of the file read it into a NSDictionary. Make a mutable copy of that dictionary with mutableCopy and NSMutableDictionary.
Now edit that mutable dictionary as you like (add s.th., remove s.th., edit s.th. and so on).
Now that you're done you can write it back to the old path as you did with temp.
Your main problem is that you're not working with a mutable version of that dicitionary. It'd make your life much easier.
I am a beginner using Objective-C. I used the following code to move a file to iCloud but it gives an error that The operation could not be completed. The file exists.
//store the file locally in document folder
NSArray *docPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *filePath = [docPaths objectAtIndex:0];
filePath = [filePath stringByAppendingString:#"/"];
filePath = [filePath stringByAppendingString:fileName];
NSString *writeError = nil;
NSData * fileData = [NSPropertyListSerialization dataFromPropertyList:dataDic format:NSPropertyListXMLFormat_v1_0 errorDescription:&writeError];
if ([fileData writeToFile:filePath atomically:YES]) {
NSLog(#"Server file is stored locally");
}else {
NSLog(#"%#", writeError);
}
// store the file in iCloud folder
NSURL *ubiquitousURL = [[NSFileManager defaultManager] URLForUbiquityContainerIdentifier:nil];
NSString *tmpubiquitousURL = ubiquitousURL.absoluteString;
tmpubiquitousURL = [tmpubiquitousURL stringByAppendingString:fileName];
NSURL *ubi2 = [[NSURL alloc] initWithString:tmpubiquitousURL];
[[NSFileManager defaultManager] setUbiquitous:YES itemAtURL:filePathURL destinationURL:ubi2 error:&error];
I used the following to remove the file from iCloud but it gives an error that Cannot disable syncing on an un-synced file.
[[NSFileManager defaultManager] setUbiquitous:NO itemAtURL:filePathURL destinationURL:ubi2 error:&error];
I checked the availability of iCloud in my app delegate and it's available. The file is an XML file (.plist) and I have a local copy stored in NSDocumentDirectory.
Overall, I want to sync that file in iCloud so it will be accessible on all devices using my app. I have been struggling with this for 2 days, so if you could help me to resolve the problem I would appreciate it.
Note: I would rather not to use UIDocument, however, if that is the only option please let me know.
I also have the same problem while using the code
[[NSFileManager defaultManager] setUbiquitous:NO itemAtURL:filePathURL destinationURL:ubi2 error:&error];
you have to change the code like below for this to work correctly
[[[NSFileManager alloc]init]setUbiquitous:YES itemAtURL:filePathURL destinationURL:ubi2 error:nil];
this code is for moving a file to icloud, also you should change the name of the file you are moving. It should not be same.
I have some data in a .txt file that I dragged over to resources in xcode 4.2. I then use some methods that call upon this file, read it, and display it on the screen to the user. It works. My problem is writing to the end of the same file (aka updating the file based on something the user did) directly on the iphone/ the simulator. It does not write for I feel I am not calling upon the right location and perhaps method. This is my code to write to the end of file, if anyone knows why this is not working it would be tremendous help.
Thank you
-(void)updateFile:(id)sender
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
//append filename to docs directory
NSString *myPath = [documentsDirectory stringByAppendingPathComponent:#"Mom.txt"];
fileHandle = [NSFileHandle fileHandleForUpdatingAtPath:myPath];
dateCombinedString= [dateCombinedString lowercaseString];
writtenString= [[NSString alloc]initWithFormat:#", %#, %#, %#",dateString,trimmedString,ForDisplay];
[fileHandle seekToEndOfFile];
[fileHandle writeData:[writtenString dataUsingEncoding:NSUTF8StringEncoding]];
[writtenString release]
}
The file you dragged to Xcode is inside your app resources. You can get the path to resource with this line of code:
NSURL* fileUrl = [[NSBundle mainBundle] URLForResource:#"Mom" withExtension:#"txt"];
However, you cannot modify the files in the resource directory therefore you should first copy that file to your document directory, then modify it with the code in the question.
Here is how you can copy file from resources if the file does not exist on the documents folder:
NSFileManager* fm;
fm = [NSFileManager defaultManager];
//only copy it from resources if it does not exits
if(![fm fileExistsAtPath:myPath]){
NSURL* myUrl = [NSURL fileURLWithPath:myPath];;
NSError* error = nil;
[fm copyItemAtURL:fileUrl toURL:myUrl error:&error];
//handle the error appropriately
}
I'm trying to create a text file with the contents of a string to my desktop. I'm not sure if I'm doing it right, I don't get errors but it doesn't work either...
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDesktopDirectory, NSUserDomainMask, YES);
NSString *desktopDirectory=[paths objectAtIndex:0];
NSString *filename = [desktopDirectory stringByAppendingString: #"file.txt"];
[myString writeToFile:filename atomically:YES encoding: NSUTF8StringEncoding error: NULL];
//Method writes a string to a text file
-(void) writeToTextFile{
//get the documents directory:
NSArray *paths = NSSearchPathForDirectoriesInDomains
(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
//make a file name to write the data to using the documents directory:
NSString *fileName = [NSString stringWithFormat:#"%#/textfile.txt",
documentsDirectory];
//create content - four lines of text
NSString *content = #"One\nTwo\nThree\nFour\nFive";
//save content to the documents directory
[content writeToFile:fileName
atomically:NO
encoding:NSStringEncodingConversionAllowLossy
error:nil];
}
You don't know if you're getting any errors because you're ignoring the returned YES/NO value of the -writeToFile:... method, and giving it no error pointer into which to record any possible failure. If the method returns NO, you'd check (and handle or present) the error to see what went wrong.
At a guess, the failure is due to the path you constructed. Try -stringByAppendingPathComponent: instead of -stringByAppendingString: ... this and its related methods properly handle paths.
The file probably is actually being created (ie, you might not be getting any errors after all). My guess is the file is created somewhere like "~/Desktopfile.txt" since your use of -stringByAppendingString: doesn't consider the string as slash-separated path. Check your home folder - I'll bet the file's there.
the problem is that the desktop directory string ends in nothing (no /). Check this out (on an iPhone) by using UIAlertview.