I have made an iphone application in which i am getting songs from itunes library and display in table as well as store them in my document directory. Now i want to make it secret..So i want to delete the selected file from itunes library so it wont be displayed in list. Can anyone help me to do this??
Code:
importableDoc = [NSMutableArray array];
// Get public docs dir
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *publicDocumentsDir = [paths objectAtIndex:0];
// Get contents of documents directory
NSError *error;
NSArray *files = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:publicDocumentsDir error:&error];
if (files == nil) {
NSLog(#"Error reading contents of documents directory: %#", [error localizedDescription]);
}
// Add all mp3 files to a list
for (NSString *file in files) {
if ([file.pathExtension compare:#"mp3" options:NSCaseInsensitiveSearch] == NSOrderedSame)
{
NSString *fullPath = [publicDocumentsDir stringByAppendingPathComponent:file];
//NSLog(#"fullPath : %#",fullPath);
[importableDoc addObject:fullPath];
}
}
}
Sorry, but it looks like you're out of luck. From Media Player Framework Reference:
The Media Player framework provides facilities for playing movie,
music, audio podcast, and audio book files. This framework also gives
your application access to the iPod library, letting you find and play
audio-based media items synced from iTunes on the desktop. iPod
library access is read-only.
As an alternative, instead of using a MPMediaPickerController you could use MPMediaQueries to display your own custom list of songs available, but that still doesn't give you to opportunity to actually remove tracks from the users iPod library.
Related
In my app I imported 4 sound files. Now I want to list all the sound files in a View. When the user clicks any one of the sound, it needs to be selected and played as like in the Alarms app (choosing the sound for alarm). The difference here is I am getting the sound from my project. I have searched in SO and Google but I couldn't find a solution exactly for this problem.
Assuming that "In my app i imported 4 sound files" means that the files are in your app bundle (and also assuming that the extension of the files is MP3 - you can change it to whatever extensions they actually have):
NSString *bundlePath = [[NSBundle mainBundle] resourcePath];
NSFileManager *mgr = [[NSFileManager alloc] init];
NSArray *allFiles = [mgr contentsOfDirectoryAtPath:bundlePat error:NULL];
for (NSString *fileName in allFiles)
{
if ([[fileName pathExtension] isEqualToString:#"mp3"])
{
NSString *fullFilePath = [bundlePath stringByAppendingPathComponent:fileName];
// fullFilePath now contains the path to your MP3 file
DoSomethingWithFile(fullFilePath);
}
}
My app is using the NSDocumentDirectory to save images in it, I just wanna ask if its the safe way to save images(100 maximum). I have read several thread & questions with answers about it, though I dont know which to follow.Some say that its okay to save there. Some say I shouldnt use NSDocumentDirectory for saving, because it will be back-up by the iCloud. So where can I save it that when the user exit the app then run the app again, then images should still be there?. I dont know much about the tmp directory or cache directory. But if its either one of the 2 that I should use, How can I use them in my code here:
NSArray *paths = NSSearchPathForDirectoriesInDomains( NSDocumentDirectory, NSUserDomainMask ,YES );
NSString *documentsDir = [paths objectAtIndex:0];
NSString *savedImagePath = [documentsDir stringByAppendingPathComponent:[NSString stringWithFormat:#"Images%d.png", i]];
ALAssetRepresentation *rep = [[info objectAtIndex: i] defaultRepresentation];
UIImage *image = [UIImage imageWithCGImage:[rep fullResolutionImage]];
//----resize the images
image = [self imageByScalingAndCroppingForSize:image toSize:CGSizeMake(256,256*image.size.height/image.size.width)];
NSData *imageData = UIImagePNGRepresentation(image);
[imageData writeToFile:savedImagePath atomically:YES];
Thank you so much for the help.
The tmp and cache directories are periodically cleaned up by iOS. If the images are for general use, use the camera roll as the other two answers suggest. However if these images are intended just for the scope of your app, you can still safely store them in the Documents directory, you just have to include an "exclude from iCloud backup" function call to each file after saving, in order to prevent Apple rejecting your app for using too much iCloud space. Of course there's a trade-off, disabling this means the user will lose their photos anyway should they delete the app or get another device(etc), but this caveat is preferable to not getting the App on the store at all.
To disable iCloud backup on a file, there's two methods for iOS versions > 5.0:
UPDATE! MERGED BOTH METHODS INTO A SINGLE FUNCTION THAT AUTOMATICALLY HANDLES iOS VERSION:
#include <sys/xattr.h> // Needed import for setting file attributes
+(BOOL)addSkipBackupAttributeToItemAtURL:(NSURL *)fileURL {
// First ensure the file actually exists
if (![[NSFileManager defaultManager] fileExistsAtPath:[fileURL path]]) {
NSLog(#"File %# doesn't exist!",[fileURL path]);
return NO;
}
// Determine the iOS version to choose correct skipBackup method
NSString *currSysVer = [[UIDevice currentDevice] systemVersion];
if ([currSysVer isEqualToString:#"5.0.1"]) {
const char* filePath = [[fileURL path] fileSystemRepresentation];
const char* attrName = "com.apple.MobileBackup";
u_int8_t attrValue = 1;
int result = setxattr(filePath, attrName, &attrValue, sizeof(attrValue), 0, 0);
NSLog(#"Excluded '%#' from backup",fileURL);
return result == 0;
}
else if (&NSURLIsExcludedFromBackupKey) {
NSError *error = nil;
BOOL result = [fileURL setResourceValue:[NSNumber numberWithBool:YES] forKey:NSURLIsExcludedFromBackupKey error:&error];
if (result == NO) {
NSLog(#"Error excluding '%#' from backup. Error: %#",fileURL, error);
return NO;
}
else { // Succeeded
NSLog(#"Excluded '%#' from backup",fileURL);
return YES;
}
} else {
// iOS version is below 5.0, no need to do anything
return YES;
}
}
If your app must support 5.0, then unfortunately your only option is to save those photos in the Caches directory, which means they won't be backed up (this not causing an App Store rejection for that reason), but whenever the storage watchdog decides it's time to clean the Caches folder, you'll lose those photos. Not an ideal implementation at all, but such is the nature of the beast in 5.0, where Apple added in Backup exclusion as an afterthought.
EDIT: Forgot to answer the 'how to save to the tmp/cache directory' part of the question. If you do decide to go down that path:
Saving to tmp:
NSString *tempDir = NSTemporaryDirectory();
NSString *savedImagePath = [tempDir stringByAppendingPathComponent:[NSString stringWithFormat:#"Images%d.png", i]];
(note that this won't appear to have any effect in the simulator, but it works as expected on device)
Saving to Cache:
NSString *cacheDir = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask,YES)lastObject];
NSString *savedImagePath = [cacheDir stringByAppendingPathComponent:[NSString stringWithFormat:#"Images%d.png", i]];
If you want the user to be able to use the images in other apps or view them along with their photos, use the photo album as Mike D suggest. If the files are something you generate locally for use with your app only, then you should probably use the documents directory. You can expose the documents directory to iTunes with the info.plist option "Application supports iTunes file sharing" which will allow the user to add or delete files through iTunes, but the files will not be exposed to other apps
You are saving scaled images so they are really only useful for your game. They are not going to be very large and will not take up much space. You could save them in the Library directory for the app and avoid the whole iCloud thing, as it doesn't sound like there is any reason to back them up. Also, saving the the Library avoid the possibility of the user deleting them, if for some other reason you have iTunes sharing turned on.
Update: code for saving to the app Library directory
- (void)saveSequences:(NSMutableDictionary*)sequences
{
NSArray *path = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);
NSString *libDirectory = [path objectAtIndex:0];
NSString *settingsPath = [libDirectory stringByAppendingPathComponent:#"userSequences.plist"];
NSLog(#"settingsPath %#", settingsPath);
[sequences writeToFile:settingsPath atomically:YES];
}
// The code below gets the path to a named directory in the 'Documents' folder - and if it doesn't exist, creates it. Adjust it to use the Library path, if you decide to go that route.
- (NSString *)getDirectoryBySequenceName:(NSString *)sequenceName
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString * documentDirectory = [paths objectAtIndex:0];
NSString * sequenceDirectory = [documentDirectory stringByAppendingPathComponent:sequenceName];
NSError *error;
BOOL success = [[NSFileManager defaultManager] createDirectoryAtPath:sequenceDirectory
withIntermediateDirectories:YES
attributes:nil error:&error];
if (!success) {
NSLog(#"Error creating data path: %#", [error localizedDescription]);
}
return sequenceDirectory;
}
Depending on the purpose of your app, you could save it to the photos app (UIImageWriteToSavedPhotosAlbum(image, self, nil, nil) I think, Apple reference). Saving here, or in the documents directory (or any sub folder), will allow the user backup those images to iCloud or iTunes, if the user chooses too and/or if they have set up iCloud.
Since you state the images need to persist between launches, the temp or cache directory get emptied when the application is removed from memory, maybe sooner (the O/S decides).
More about the iOS file system.
I want to load a webpage when user connected to network and store it offline(including with images/resources). If the user not connected to any network then i should load the previously stored webpage. I have tried NSData dataWithContentsOfURL:(NSURL *)url and NSString stringWithContentsOfURL but these stores only html content not the resources.
Thanks in advance.
You can do that with ASIHttpRequest. If you do not want to to use that project (it is no longer active) you can look into the code and what it does. Look at "how to cache a whole web page with images in iOS" for more info as well.
I think the simple solution is this - "Safari Client-Side Storage and Offline Applications Programming Guide", https://developer.apple.com/library/archive/documentation/iPhone/Conceptual/SafariJSDatabaseGuide/Introduction/Introduction.html
Only if you are making an app with HTML5 and webview, didn't test this method yet so far, so it might work.
Write this data into file using:
-(void)writeDataToFile:(NSString*)filename
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
if(filename==nil)
{
DLog(#"FILE NAME IS NIL");
return;
}
// the path to write file
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat: #"%#",filename]];
/*NSData *writeData;
writeData=[NSKeyedArchiver archivedDataWithRootObject:pArray]; */
NSFileManager *fm=[NSFileManager defaultManager];
if(!filePath)
{
//DLog(#"File %# doesn't exist, so we create it", filePath);
[fm createFileAtPath:filePath contents:self.mRespData attributes:nil];
}
else
{
//DLog(#"file exists");
[self.mRespData writeToFile:filePath atomically:YES];
}
NSMutableData *resData = [[NSMutableData alloc] init];
self.mRespData=resData;
[resData release];
}
and load it next time.
I don't know if there is one-line-solution like myWebView.cache4Offline = YES; , but I fear as long as you don't have access to the website's code (i.e. if you want to make any website available offline inside your app), you have to program this on your own. Thinking about it, it doesn't seem so difficult:
Scan the html string for image urls (and everything else you need)
Download those resources from the internet using NSData dataWithContentsOfURL (maybe a little annoying, because of relative/absolute URLs)
Save data to file with NSData writeToFile:options:error:
Replace URL in HTML with filePath from 3. (OR, better use a convention for converting their URLs in your file-URLs)
Hope it helps
I have a file which I want to file share. 'hello.mp3'
At the moment the code enables file sharing if the file is in the app.
I was hoping I would be able to do it over http. So file sharing with the link instead of the sound being in the app. I want to do this because it will save memory for the user.
Here is the current code. The code allows file sharing if the file is in the app. I want it so the user will 'download' the sound from a http server such as http://test.com/hello.mp3
Thanks
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
NSArray *names = [NSArray arrayWithObjects: #"hello.mp3",
#"hi.mp3", nil];
for (NSString *fileName in names)
{
NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *documentDBFolderPath = [documentsDirectory stringByAppendingPathComponent:fileName];
if (![fileManager fileExistsAtPath:documentDBFolderPath])
{
NSString *resourceDBFolderPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:fileName];
[fileManager copyItemAtPath:resourceDBFolderPath toPath:documentDBFolderPath error:&error];
}
}
}
I may be wrong, but that may not be allowed. In the guidelines:
2.7 Apps that download code in any way or form will be rejected.
While an audio file may not be "code", if it is used within the app, perhaps as a language translation item, etc...I would think it would be rejected...just my 2 cents worth though.
Correct, you can "stream" content over HTTP, but if your using HTTP AND saving to the "Documents" directory to hold content you risk rejection by the app store.
If you need a workaround maybe use the "tmp" directory and save a file off a file there. The complaint Apple has is mainly using phone data more than should be in a 3rd party application.
Hi everyone I am working on an application which records the user sound and save that to NSDocumentDirectory.The data files are saving well.But the problem is that i want to play those files.I am using the table view for this to populate it with the number of files in the NSDocumentDirectory.But the table shows only one cell the current sound file.I am doing mistake somewhere please help me out.
I am using this code to play.
-(void)PlayAudio
{
NSArray *paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSLog(#"strffdsa %#",documentsDirectory);
NSURL *fileURL = [NSURL fileURLWithPath:recorderFilePath];
player = [[AVAudioPlayer alloc] initWithContentsOfURL: fileURL error: nil];
player.numberOfLoops = 0;
//[fileURL release];
[player play];
[player setDelegate: self];
}
Where recorderFilePath is the path of file.The path is new everytime with the help of NSDate frmattor.But not getting how to populate the table view with all the files residing in the DocumentDirectory.
Please-2 help me...I am new to this technology.
Thanks in advance to all ........
Use an enumerator to simplify iterating through the Documents directory to search for music files.
//Use an enumerator to store all the valid music file paths at the top level of your App's Documents directory
NSDirectoryEnumerator *directoryEnumerator = [[NSFileManager defaultManager] enumeratorAtPath:documentsDirectory];
for (NSString *path in directoryEnumerator)
{
//check for all music file formats you need to play
if ([[path pathExtension] isEqualToString:#"mp3"] || [[path pathExtension] isEqualToString:#"aiff"] )
{
[myMusicFiles addObject:path];
}
}
//the NSArray 'myMusicFiles' will be the datasource for your tableview
You need NSFileManager's contentsOfDirectoryAtPath:error: method to get an array of files in the request directory. Then iterate over that array to find the file name you're looking for.