I am using dropbox API and downloading file in application document folder.
I am able to view list of files in table from document directory. How can I read photos or file from this table view?
And what about the iPhone. Can we access document folder directly?
This is the more commonly used approach to get the documents directory –
NSArray *searchResults = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [searchResults objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:fileName];
You can use NSFileManager to examine the contents of the directory. You can look at the contentsOfDirectoryAtPath:error: method.
Access document Folder -
NSDictionary *theCatalogInfo=nil;
NSString *theCatalogFilePath = [NSString stringWithFormat:#"%#/Documents/",NSHomeDirectory()];
theCatalogFilePath = [theCatalogFilePath stringByAppendingString:#"File Name"];
if(nil!=theCatalogFilePath)
{
theCatalogInfo=[[NSDictionary alloc]initWithContentsOfFile:theCatalogFilePath];
}
return theCatalogInfo;
Related
I don't know how can I create XML document using GDataXML nor I could find any good link which can help me.Please tell me how can I perform this or give some good link.
Take look at http://www.raywenderlich.com/725/how-to-read-and-write-xml-documents-with-gdataxml tutorial. It will help you.
First create and store the xml value to a string.
Then use the following method to create the xml file in the document directory.
//Method writes a string to a xml file
-(void) writeToXMLFile:(NSString *)content
{
//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:#"%#/xmlfile.xml",documentsDirectory];
//save content to the documents directory
[content writeToFile:fileName atomically:NO encoding:NSStringEncodingConversionAllowLossy error:nil];
}
i am doing one iphone app, for that i have to store bulk of MP3 song and images.
can ay one tell me what is the best to store those in terms of performance.
Store the image and songs in the application directory. This is best and easy way to handle. Try the following code. it will be help you.
//Store Image/Songs files to Application Directory
+(BOOL)writeToFile:(NSData *)data fileName:(NSString *)fileName {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
// the path to write file
NSString *appFile = [documentsDirectory stringByAppendingPathComponent:fileName];
return [data writeToFile:appFile atomically:YES];
}
//Image/songs - Retrieve from Application Directory
+(NSData *)readFromFile:(NSString *)fileName {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:fileName];
NSData *myData = [NSData dataWithContentsOfFile:filePath];
if (myData) {
return myData;
}
return nil;
}
store the MP3 song and images into resources folder of your app project and give the refrences in the sqlite database(because saving large files in sqlite database is not a good practice)
I would suggest you to store all items of large size on the device disk, i.e, Documents directory and store their physical path in core data or sqlite or at least in a plist file so that you can retrieve them as per your convenience.
How would i download and save an image to the root of the application so basically i can access the image via
[UIImage imageNamed:#"myimage.jpg"];
Thanks
Mason
First you need to get the Image Data
NSData *imageData = [NSData dataWithContentsOfURL:[NSURL URLWithString:#"http://media03.linkedin.com/mpr/mpr/shrink_80_80/p/3/000/064/2e2/1bd3849.jpg"]];
Then you need to write the data to Documents directory
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *pathLD = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:#"imageLD%d.jpeg",[[NSDate date] timeIntervalSince1970]]];
NSFileManager *fileManager = [NSFileManager defaultManager];
if (![fileManager fileExistsAtPath: pathLD]){
[imageData writeToFile:pathLD atomically:YES];
} else {
NSLog(#"File exists at path:%#", pathLD);
}
To get the image from Documents you do:
[UIImage imageWithContentsOfFile:pathLD];
Good luck :D;
You shouldn't for various reasons. Consider your application directory as being read-only.
You should use the Documents or Library directory. Apple recommends that you should use the Documents directory if your files should be user-accessible via iTunes (if you have enabled the file sharing via iTunes), or use a custom subdirectory of Library (which you need to create with NSFileManager) if it shouldn't be user-visible (but should be backed up).
You can query the path to the Library directory like this:
NSArray *paths;
paths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory,
NSUserDomainMask, YES);
// dir = [paths objectAtIndex:0];
Substitute NSLibraryDirectory with NSDocumentsDirectory to get the Documents directory.
Then you would make a method that returns the full path to your image, and you would then do:
[UIImage imageWithContentsOfFile:[self pathForImage:#"myimage.jpg"]]
if i place a image.png file in my resource, iphone will be able to read it. if i place a image.png file in iphone document folder it doesn't read?
i am sending the image over from my server, into the document folder. no problem with that.
i thought iphone will auto find the image file either in resource folder or document folder?
i did write any code for my app to locate the folder of my image, just called it by its file name, which is correct.
any ideas?
thks
// Get path to doc folder
NSArray *docpaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [docpaths objectAtIndex:0];
NSString *docpath = [documentsDirectory stringByAppendingPathComponent:#"Data.plist"];
self.data = [NSArray arrayWithContentsOfFile:docpath];
done loading the plist from doc folder.
now i go to plist, get the file name and display for cell.
NSDictionary *dataItem = [data objectAtIndex:indexPath.row];
cell.icon = [UIImage imageNamed:[dataItem objectForKey:#"Icon"]];
how can i specifiy the image is in my document folder?
You can create an UIImage from a file by using imageWithContentsOfFile. However you can not read the file just specifying the name if it is in document folder. You need to get the path of your file. Check this answer to get an idea of how to get the file path of document folder.
-- edit
If your plist contains the file names in document folder, then append the filenames from plist to document folder path to get the full path. Hope it helps.
NSArray *docpaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [docpaths objectAtIndex:0];
NSDictionary *dataItem = [data objectAtIndex:indexPath.row];
NSString *imagePath = [documentsDirectory stringByAppendingPathComponent:[dataItem objectForKey:#"Icon"]];
cell.icon = [UIImage imageWithContentsOfFile:imagePath];
I am building an add-on to my app where the user can search for an item in a list that is pre-populated with data from a .plist file. It is an NSDictionary. If the term, the user searched for, does not exist, the user can tap a + button and add it so it is there the next time.
First of I thought it would be as easy as using the NSUserDefaults, but a few problems arises.
To have the list included I must place it in the bundle, but if it is there I can not add new key/value pairs to it. This I can only do with files situated in the Documents folder.
So I guess I have to bundle the plist, then on first run I'll move it to the documents folder and access it there.
This opens up the problem when I need to update the app, I guess it will overwrite the values the user put in.
Is there a secure, easy-understandable, right way to achieve the functionality I describe?
Thanks for any help given:)
Edit: **** the actual approach, as suggested by TheSquad and TomH *****
+ (NSMutableDictionary*) genericProducts {
NSFileManager *fileManager = [NSFileManager defaultManager];
NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [documentPaths objectAtIndex:0];
NSString *documentPlistPath = [documentsDirectory stringByAppendingPathComponent:#"GenericProducts.plist"];
NSString *bundlePath = [[NSBundle mainBundle] bundlePath];
NSString *bundlePlistPath = [bundlePath stringByAppendingPathComponent:#"GenericProducts.plist"];
if([fileManager fileExistsAtPath:documentPlistPath]){
NSMutableDictionary *documentDict = [NSMutableDictionary dictionaryWithContentsOfFile:documentPlistPath];
return documentDict;
} else {
NSError *error;
BOOL success = [fileManager copyItemAtPath:bundlePlistPath toPath:documentPlistPath error:&error];
if (success) {
NSMutableDictionary *newlySavedDict = [NSMutableDictionary dictionaryWithContentsOfFile:documentPlistPath];
return newlySavedDict;
}
return nil;
}
}
And for adding a new product to the list:
+ (void) addItemToGenericProducts:(NSString*) newProduct {
NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [documentPaths objectAtIndex:0];
NSString *documentPlistPath = [documentsDirectory stringByAppendingPathComponent:#"GenericProducts.plist"];
NSMutableDictionary *documentDict = [NSMutableDictionary dictionaryWithContentsOfFile:documentPlistPath];
[documentDict setObject:newProduct forKey:[MD5Checksum cheksum:newProduct]];
[documentDict writeToFile:documentPlistPath atomically:YES];
}
I had the same thoughts with my sqlite database...
I end up doing exactly that, copy the bundled file into documents in order to be able to modify it.
What I have done is checking at each startup if the file exist, if it does not, copy it.
If you do an update of your App, the documents folder will not be touch, this means the copied file from the previous version will still be present.
The only issue is that if you want your plist to be upgraded you will have to handle that in your application. If you have to do so I suggest you use the NSUserDefault to check if a previous version of the app existed before...
The contents of the documents directory is not altered when an application is updated.
The contents of the documents directory are deleted when the user deletes the app.
When the app is run the first time write a flag to NSUserDefaults. On subsequent runs of the app, check for existence of the flag. (alternatively, you can just check for existence of the plist in he documents directory)