So my app keeps on crashing and losing all the logs outputed in console. I decided to jailbreak the phone, and use this code to write to a file:
+(void)Log:(NSString *)content
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask, YES);
NSString* docDir = [paths objectAtIndex:0];
NSString * logFile = [docDir stringByAppendingString:#"/log.txt"];
NSData *dataToWrite = [content dataUsingEncoding: NSUTF8StringEncoding];
NSFileHandle* outputFile = [NSFileHandle fileHandleForWritingAtPath:logFile];
[outputFile seekToEndOfFile];
[outputFile writeData:dataToWrite];
[outputFile closeFile];
}
if I put a break point, the value of outputFile looks like this:
/var/mobile/Applications/B8AB0D75-7FBE-4C5B-8D48-2ABCE9C7564D/Documents/log.txt
I installed vim on my phone via cydia, and there is no log.txt in the said directory! (I've SSH'd into my iPhone using iphone tunnel as root SSH. On another attempt, I manually created the log.txt using vim and ran the code again.. still nothing gets appended to the file.. any ideas?
turns out to be a writing permission to the file.. so i just chmod'ed it and it works fine.. D'OH!
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hello i am beginner in iOS In one of my activity i want to ask .....I displayed pdf using WebView ......on screen and save this Pdf then write this type of code ........
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory , NSUserDomainMask, YES);
NSString *documentsDir = [paths objectAtIndex:0];
NSString *pdfFilePath =[documentsDir stringByAppendingPathComponent:#"myPDF.pdf"];// your yourPdfFile file here
NSLog(#"pdf file %#",pdfFilePath);
NSURL *url = [NSURL fileURLWithPath:pdfFilePath];
UIDocumentInteractionController *docController = [UIDocumentInteractionController interactionControllerWithURL:url];
docController.delegate = self;
[docController presentOpenInMenuFromRect:CGRextZero inView:self.view animated:YES];
When we run this code on simulator (using Xcode) then show path and I got this Pdf file successfully in documents folder .......
but when we run this code in iPhone device then I got this type of path......
/var/mobile/Applications/D33A80AA-C0AD-4211-ADE3-4906372CDA40/Documents/myPDF.pdf
So I don't know where is my Pdf in iPhone device and how to got this Pdf and open .....when i want ......
If your PDF is in the documents folder, you should retrieve the path like this:
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *basePath = ([paths count] > 0) ? [paths objectAtIndex:0] : nil;
Don't try to use anything related to the absolute path as you see it in the simulator.
One reason you might not find a file on the device where you do find it on the simulator is that the simulator is case-insensitive but the device is case-sensitive, so be sure your names match exactly.
But! Be aware that the Documents folder is now perhaps not where you want to be storing things - unless you are sure you want them backed up with iCloud. The File System Programming Guide says to use Documents ONLY for documents that cannot be recreated by the app, "critical" documents. A lot of the time it makes sense to store them in the user Library folder instead. In that case the arguments to NSSearchPathForDirectoriesInDomains would be:
(NSLibraryDirectory, NSUserDomainMask, YES)
my app is creating a CSV file out of a db. I want to browse and open the file to test. How do I access the iphone simulator's storage ?
All data of the Simulator is stored as local files on your Mac.
The path for the user data of iOS apps in the Simulator is:
~/Library/Application Support/iPhone Simulator/[OS version]/Applications/[appGUID]/
You'll want to print out the location of where you store your file when you run the app in the simulator.
You can use this code to get the location of the Library/Cache folder here:
-(NSString *) mediaPathForFileName:(NSString *) fileName
{
NSArray *directoryPaths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSString *cachesDirectory = [directoryPaths objectAtIndex:0];
NSString *filePath = [NSString stringWithFormat:#"%#/%#", cachesDirectory, fileName];
return filePath;
}
Pass in a random file name like "test.txt":
// somewhere in your viewDidLoad method
[self mediaPathForFileName:#"test.txt"];
This will print out the path to your app Library/Cache folder.
you need get the path of that file by using NSLog and then user Shift+Cmd+G to go to that path.
pritn this path
NSArray *directoryPaths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
I am trying to creating a file on my MacOS FS from my IPhone app by means of this code
[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) ];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *path = [paths objectAtIndex:0];
path = [path stringByAppendingPathComponent: #"log.txt"];
NSFileHandle *output = [NSFileHandle fileHandleForWritingAtPath:path];
if(output == nil) {
[[NSFileManager defaultManager] createFileAtPath:path contents:nil attributes:nil];
output = [NSFileHandle fileHandleForWritingAtPath:path];
} else {
[output seekToEndOfFile];
}
I guess the code is OK as it works when executed by the Simulator. However I can't actually see where the file is created when executed from the IPhone. If I print the path I get
/var/mobile/Applications/XXX-XXXX-XXX-XXX/Documents/log.txt
On the simulator, you should find them under: /Users/loginname/Library/Application Support/iPhone Simulator/5.1/Applications/594931F3-B9EF-4B2C-833D-76C2DCC61C6B/Documents. You can go to this location from Finder by choosing the Go menu item, holding down the Option key, then choosing Library.
NOTE: Fill in your own loginname and device ID in the path above.
If you are on the device, you can copy the file over to your Mac using XCode, using the organizer (choose Window | Organizer). Highlight the App (after it has been executed, of course) and there is an option to copy the file over. You don't have direct access to the device file system.
You can also use NSLog() which just sends the debug info to the output window in XCode.
EDIT: Added detail on how to show Library folder.
I am developing an iPhone app with someone else. The app works fine for me, but he is running into a bug. We think this bug is related to the fact that he is getting multiple Application directories for this same app. In my ~/Library/Application Support/iPhone Simulator/User/Applications, I only have one folder at all times.
He says that he will get 3 or 4 directories when he is only working on this one app. We think this is our problem because our bug has to do with displaying images that are stored in the app's Documents folder. Does anyone know why he is ending up with multiple directories or how to stop it?
Edit:
Here is the code for writing the image to a file:
NSData *image = [NSData dataWithContentsOfURL:[NSURL URLWithString:[currentArticle articleImage]]];
NSArray *array = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *imagePath = [array objectAtIndex:0];
NSFileManager *NSFM = [NSFileManager defaultManager];
BOOL isDir = YES;
if(![NSFM fileExistsAtPath:imagePath isDirectory:&isDir])
if(![NSFM createDirectoryAtPath:imagePath attributes:nil])
NSLog(#"error");
imagePath = [imagePath stringByAppendingFormat:#"/images"];
if(![NSFM fileExistsAtPath:imagePath isDirectory:&isDir])
if(![NSFM createDirectoryAtPath:imagePath attributes:nil])
NSLog(#"error");
imagePath = [imagePath stringByAppendingFormat:#"/%#.jpg", [currentArticle uniqueID]];
[image writeToFile:imagePath atomically:NO];
And here is the code for getting the path when I need the image:
- (NSString *)imagePath
{
NSArray *array = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *imagePath = [array objectAtIndex:0];
return [imagePath stringByAppendingFormat:#"/images/%#.jpg", [self uniqueID]];
}
The app works great for me, but my partner says that the images don't show up intermittently, and he notices that he gets multiple directories in his Applications folder.
I had this problem (I was saving photos in the apps documents directory) and after every new build the directory get's renamed, so my paths were no longer valid. I cooked up these 2 functions (in my app delegate) that will give me a path for the file I want to save or load from the documents or temp directory. Even if the app directory changes, as long as you only store the file name and not the full path, and then use your helper functions to get the path when you need it later you will be ok. Here's my functions for this:
+ (NSString*)fullPathToFile:(NSString*)file {
NSArray* paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString* documentsDirectory = [paths objectAtIndex:0];
return [documentsDirectory stringByAppendingPathComponent:file];
}
+ (NSString*)fullPathToTemporaryFile:(NSString*)file {
return [NSTemporaryDirectory() stringByAppendingPathComponent:file];
}
Works like a charm.
We are caching images downloaded from our server. We get the data from an ASIHTTPRequest callback like this:
#pragma mark ASIHTTPRequest callback
-(void)imageDownloadFinished:(ASIHTTPRequest*)aRequest
{
NSString* fileName = aRequest.url.path.lastPathComponent;
[self imageDidArrive:[aRequest responseData] forFileName:fileName];
}
We write the image data to our local storage like this:
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0] ;
NSString* folder = [[documentsDirectory stringByAppendingPathComponent:#"flook.images"] retain];
NSString* fileName = [folder stringByAppendingFormat:#"/%#", aBaseFilename];
BOOL writeSuccess = [anImageData writeToFile:fileName atomically:NO];
The downloaded images are always the expected size, around 45-85KB.
Later, we read images from our cache like this:
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0] ;
NSString* folder = [[documentsDirectory stringByAppendingPathComponent:#"flook.images"] retain];
NSString* fileName = [folder stringByAppendingFormat:#"/%#", aBaseFilename];
image = [UIImage imageWithContentsOfFile:fileName];
Occasionally, the images returned from this cache read are much smaller because they are much more compressed - around 5-10KB. Has the OS done this to us?
Edit - it turns out that we are downloading the small images, so the issue isn't on the iPhone
If I'm reading your code correctly, you're using the NSData method writeToFile:atomically: to write to the file. That does an exact byte-for-byte write of the contents of the NSData object.
It appears that the NSData object is created directly from the contents of the HTTP response, so the answer is "no", there should not be any compression taking place.
We have the solution. When the phone is running on the 3G network, O2 kindly steps in and applies extra JPG compression to our images, so that they look extra horrible.
See this post on the UK 3G forum.