I create a file with attribute NSFileappendonly, i am thinking this is enough to create readonly file in ios.My problem is try to remove the file from device it returns error.Please anyone help me..
A 513 states you do not have permission to write to that folder NSFileWriteNoPermissionError. You need to make sure you are only trying to write to one of the 3 folders in your app's dir (Documents, Temp, or Cache). Generally you use the Documents folder. (Trying to write directly to the main bundle can cause the error you are having)
iOS Environment
You can remove a file with NSFileManager but only if your app is signed and you are attempting to remove from one of the 3 allowed folders. Those 3 folders are only accessible by your app.
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectoryPath = [paths objectAtIndex:0];
NSString *yourFile = [documentsDirectoryPath stringByAppendingPathComponent:#"yourFile.txt"];
NSFileManager *fileManager = [NSFileManager defaultManager];
[fileManager removeItemAtPath:yourFile error:NULL];
Related
In my App, I created subfolders under Documents, and subfolders under subfolders. So there is a Document tree. I want to get the tree in a way that I am able to list them in a tableview. They will look like the following, linear listing with different indent to show their level.
I am not sure whether there is some convenient way to get this done or not, when I am trying to do it using while loop and for loop.
Appreciate your suggestions.
Thanks.
Apple provides a number of classes for file system access, and even some for recursion that you're trying to do.
I suggest that you take a look at the Apple File System Programming Guide and the NSFileManager class documentation. Additionally, the NSDirectoryEnumerator class may help as well.
I do not know how to get entire hierarchy at a time. But following method can be helpful.
1 Use this to get documents derectory.
NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentPath = [paths objectAtIndex:0];
2 use - (NSArray *)contentsOfDirectoryAtPath:(NSString )path error:(NSError *)error for getting list of directories in document directory.
Read this Class refrence for more details.
http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSFileManager_Class/Reference/Reference.html
3 Using following method you can make path of internal directory.
NSString *directoryPath = [documentPath stringByAppendingPathComponent:[MAIN_DIRECTORY stringByAppendingPathComponent:filePath]];
Using above three can together you can brows content of document directory.
Hope this is helpful
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
and
NSFileManager *manager = [NSFileManager defaultManager];
NSArray *fileList = [manager directoryContentsAtPath:documentsDirectory];
for (NSString *s in fileList){
NSLog(s);
}
Is there any way to save my .xml file to another directory other than "/Users/student/Library/Application Support/iPhone/Simulator/User/Applications/..."
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *appFile = [documentsDirectory stringByAppendingPathComponent:#"accUserNames.xml"];
BOOL ok = [content writeToFile:appFile atomically:YES encoding:NSUnicodeStringEncoding error:nil];
if (!ok) {
NSLog(#"Error writing file !");
}
i wish to writeToFile: my .xml file to the desktop , any idea on how?
May the below code help,
NSString *documentsDirectory = #"/Users/student/Desktop/";
NSString *appFile = [documentsDirectory stringByAppendingPathComponent:#"accUserNames.xml"];
BOOL ok = [content writeToFile:appFile atomically:YES encoding:NSUnicodeStringEncoding error:nil];
if (!ok) {
NSLog(#"Error writing file !");
}
From within the iPhone Simulator, you should be able to successfully use #"/Users/student/Desktop/accUserNames.xml" as the path to write to. However, you can't do this on an iOS device (you'll be restricted to the application's sandbox directory — it's recommended you write to the Documents folder or other folders in there, depending what type of data you're storing).
Edit: I think I understand your problem. This part of your code:
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
effectively finds the path to "/Users/student/Library/Application Support/iPhone/Simulator/User/Applications/..." (this is the normal place you want to save things). But if you just want to save to the desktop temporarily, you should just use appFile = #"/Users/student/Desktop/accUserNames.xml".
Note: I don't advocate this as a long-term solution, but if you just want to see the output of your program temporarily, it works fine.
If you want to upload your file to a server ("www.blahblah.com" in your example), then using the write to file methods is not the correct approach. This is only for writing data to the local file system (or on a network share, but that doesn't apply to iPhones).
If you want to transfer data to a webserver, you will need to have something on the server that will listen for a connection request, then it will need to accept the data which is transferred from your app. You cannot just write a file to "www.blahblah.com" as you would to a file system
Probably not with code, but you could try this: Open "Automator" (in the Utilities folder) and chose "Folder Action". As Input folder, you specify the directory of the documents (/Users/student/Library/Application Support/iPhone/Simulator/User/Applications/...) and then you select, from "Files & Folders", "Duplicate Finder Items" and "Move Finder Items" and select the Desktop. Hit "Save", give it a name, and all files in the documents folder should be copied to the desktop.
this must be easy but I want to put a file in the Documents folder which is read in at start up. I have the code on how to read and have confirmed its looking in the correct directory. However the file I have ,RootList.txt when saved in the Resources folder in xcode, is stored under the Root.app folder and the Documents folder is empty. Therefore its not finding this file when I start the app.
Is there a way to ensure a file is built into the Documents directory at start up (I'm running this in the simulator).
The alternative is a plist which works fine as well but I'm just curious.
In these situations I follow this approach:
First save your RootList.txt in Resources folder in xCode.You have nothing in your Documents folder, yet.
In the beginning of your applicationDidLaunch call, do:
NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *docsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *path = [docsDirectory stringByAppendingPathComponent:#"RootList.txt"];
if(![fileManager fileExistsAtPath:path])
{
NSData *data = [NSData dataWithContentsOfFile:[[[NSBundle mainBundle] resourcePath] stringByAppendingString:#"/RootList.txt"]];
[data writeToFile:path atomically:YES];
}
Now, your file is in Documents folder at startup.
I am posting this question because I had a complete answer for this written out for another post, when I found it did not apply to the original but I thought was too useful to waste. Thus I have also made this a community wiki, so that others may flesh out question and answer(s). If you find the answer useful, please vote up the question - being a community wiki I should not get points for this voting but it will help others find it
How can I get a path into which file writes are allowed on the iPhone? You can (misleadingly) write anywhere you like on the Simulator, but on the iPhone you are only allowed to write into specific locations.
There are three kinds of writable paths to consider - the first is Documents, where you store things you want to keep and make available to the user through iTunes (as of 3.2):
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
Secondly, and very similar to the Documents directory, there is the Library folder, where you store configuration files and writable databases that you also want to keep around, but you don't want the user to be able to mess with through iTunes:
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);
NSString *libraryDirectory = [paths objectAtIndex:0];
Note that even though the user cannot see files in iTunes using a device older than 3.2 (the iPad), the NSLibraryDirectory constant has been available since iPhoneOS 2.0, and so can be used for builds targeting 3.0 (or even earlier if you are still doing that). Also the user will not be able to see anything unless you flag an app as allowing users to modify documents, so if you are using Documents today you are fine as long as you change location when updating for support of user documents.
Last there is a cache directory, where you can put images that you don't care exist for the long term or not (the phone may delete them at some point):
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSString *cachePath = [paths objectAtIndex:0];
BOOL isDir = NO;
NSError *error;
if (! [[NSFileManager defaultManager] fileExistsAtPath:cachePath isDirectory:&isDir] && isDir == NO) {
[[NSFileManager defaultManager] createDirectoryAtPath:cachePath withIntermediateDirectories:NO attributes:nil error:&error];
}
Note that you have to actually create the Caches directory there, so when writing you have to check and create every time! Kind of a pain, but that's how it is.
Then when you have a writable path, you just append a file name onto it like so:
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:#"SomeDirectory/SomeFile.txt"];
or
NSString *filePath = [cachePath stringByAppendingPathComponent:#"SomeTmpFile.png"];
Use that path for reading or writing.
Note that you can make subdirectories in either of those writable paths, which one of the example string above is using (assuming one has been created).
If you are trying to write an image into the photo library, you cannot use file system calls to do this - instead, you have to have a UIImage in memory, and use the UIImageWriteToSavedPhotosAlbum() function call defined by UIKit. You have no control over the destination format or compression levels, and cannot attach any EXIF in this way.
Thanks to Kendall & Dave, above, and I thought this amendment was useful to bring up. When using for one-off debug code, I used this trick from Mike Ash's NSBlog to eliminate the temporary variables isDir & error, minimizing the number of lines and making the verbosity almost bearable:
NSFileHandle *dumpFileHandle = nil;
#ifdef DEBUG
NSString *cachePath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) objectAtIndex:0];
if (![[NSFileManager defaultManager] fileExistsAtPath:cachePath isDirectory:&(BOOL){0}])
[[NSFileManager defaultManager] createDirectoryAtPath:cachePath withIntermediateDirectories:YES attributes:nil error:&(NSError*){nil}];
NSString *dumpPath = [cachePath stringByAppendingPathComponent:#"dump.txt"];
[[NSFileManager defaultManager] createFileAtPath:dumpPath contents:nil attributes:nil];
[(dumpFileHandle = [NSFileHandle fileHandleForWritingAtPath:dumpPath]) truncateFileAtOffset:0];
#endif
if (dumpFileHandle) [dumpFileHandle writeData:blah];
I want copy some files to Library or Document in the Product directory,
but when I add a build phase and select Products Directory in destination and input my subdir it's like Library/xxx/.
When I run the App in the simulator, I found nothing in the destination and if I set the destination to Resources, it will be there.
Can you please tell me why this is happening and how I can make it?
The documents directory should only be accessed at runtime. To my knowledge you cannot copy items there during building. What you should do is store those objects that you want in the Documents directory within your bundle and then copy them upon first launch.
Interesting question. I don't know if you can do this as part of the build phase.
To get something into the Documents directory, I have a method that runs at app startup like this:
NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *writablePath = [documentsDirectory stringByAppendingPathComponent:#"filename.txt"];
BOOL success = [fileManager copyItemAtPath:defaultDBPath writablePath error:&error];
That's an incomplete fragment but you probably get the idea. The important thing is the NSDocumentDirectory constant.
Add a new build phase -> New Copy Files Build Phase in Target