I have an NSString that already contains a pList.
How do I turn it into an NSArray?
(WITHOUT saving it to disk, only to reload it back with arrayWithContentsOfFile, and then have to delete it.)
Where is the make arrayWithPlist or arrayWithString method?
(Or how would I make my own?)
NSArray *anArray = [NSArray arrayWithPlist:myPlistString];
You want to use NSPropertyListSerialization:
NSData *data = [plistString dataUsingEncoding:NSUTF8StringEncoding];
NSError *error = nil;
NSArray *plist = [NSPropertyListSerialization
propertyListWithData:plistData
options:/*unused*/0
format:NULL
error:&error];
if (!plist) {
NSLog(#"%s: Failed to create plist: %#",
__func__, error ?: #"(unknown error)");
}
That particular method was introduced with iOS 4.0/Mac OS X 10.6. Prior to those releases, you would use:
NSData *data = [plistString dataUsingEncoding:NSUTF8StringEncoding];
NSString *errorText = nil;
NSArray *plist = [NSPropertyListSerialization
propertyListFromData:plistData
mutabilityOption:NSPropertyListImmutable
format:NULL
errorDescription:&errorText];
if (!plist) {
NSLog(#"%s: Failed to create plist: %#",
__func__, errorText ?: #"(unknown error)");
/* Part of the reason this method was replaced:
* It is the caller's responsibility to release the error description
* if any is returned. This is completely counter-intuitive.
*/
[errorText release], errorText = nil;
}
Related
My json response data formate as :-
[{"0":"1","id":"1","1":"Pradeep","name":"Pradeep","2":null,"sender":null,"3":null,"
So to parse the "name" on table view?
My own implementation is:-
I am new in ios development please help me
-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSDictionary *allDataDictionary=[NSJSONSerialization JSONObjectWithData:webData
options:0 error:nil]; // response saved in allDataDictionary
NSDictionary *feed=[allDataDictionary objectForKey:#"feed"]; // feeds entry
NSArray *feedforentry=[feed objectForKey:#"entry"];
for(NSDictionary *diction in feedforentry)
{
NSDictionary *title=[diction objectForKey:#"title"];
NSString *label=[title objectForKey:#"label"];
[array addObject:label];
}
[[self JustConfesstable]reloadData]; // reload table
}
First of all get data in Dictionary and then store what you want in NSArray.. using Keys
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options: NSJSONReadingMutableContainers error: &error];
NSLog(#"%#",json);
NSLog(#"%#",delegate.firstArray);
NSArray * responseArr = json[#"Deviceinfo"];
NSArray * firstarray=[[NSArray alloc]init];
for(NSDictionary * dict in responseArr)
{
[firstarray addObject:[dict valueForKey:#"name"]];
}
first array contains names.. what you want from that json response.
and then pass that data to tablview. what you want to do here you get the array of name data.
You need to use JSON parser. I will recommend: https://github.com/johnezang/JSONKit
With that you can do:
JSONDecoder *jsonKitDecoder = [JSONDecoder decoder];
NSError *error = nil;
id objectFromJson = [jsonKitDecoder objectWithData:data error:&error];
I have a very simple xml file by name options.xml
<Dat>
<Name>Tom</Name>
<Option>1</Option>
</Dat>
Using NSXML I am trying to change "Tom" to "Jim" and save the file. How can I do that. I read many document and there is no straight forward solution. Can some one help me with the code ?
update: I ended up in trying with Gdatasxml
-(void)saveToXML
{
NSString* path = [[NSBundle mainBundle] pathForResource:#"options" ofType:#"xml"];
NSData *xmlData = [[NSMutableData alloc] initWithContentsOfFile:path];
NSError *error;
GDataXMLDocument *doc = [[GDataXMLDocument alloc] initWithData:xmlData options:0 error:&error];
GDataXMLElement *rootElement = [GDataXMLElement elementWithName:#"Dat"];
NSArray *mySettings = [doc.rootElement elementsForName:#"Dat"];
for (GDataXMLElement *mySet in mySettings)
{
NSString *name;
NSArray *names = [mySet elementsForName:#"Name"];
if (names.count > 0)
{
GDataXMLElement *childElement = (GDataXMLElement *) [names objectAtIndex:0];
name = childElement.stringValue;
NSLog(childElement.stringValue);
[childElement setStringValue:#"Jim"];
}
}
[xmlData writeToFile:path atomically:YES];
}
But this is not saving the data. Help.
Editing XML is a little difficult in iOS. You need to parse the original xml to a model and then form the xml.
You can make use of 3rd party library such as GDataXML for forming XML from a data source.
//Edited user info saved in a dictionary
NSDictionary *dictionary = #{#"Name": #"Jim", #"Option":#"1"};
GDataXMLElement *rootElement = [GDataXMLElement elementWithName:#"Dat"];
[dictionary enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {
GDataXMLElement *element = [GDataXMLElement elementWithName:key stringValue:obj];
[rootElement addChild:element];
}];
//xml document is formed
GDataXMLDocument *document = [[GDataXMLDocument alloc]
initWithRootElement:rootElement];
NSData *xmlData = document.XMLData;
NSString *filePath = [self savedXMLPath];
//XML Data is written back to a filePath
[xmlData writeToFile:filePath atomically:YES];
Create a class that is essentially an XML "node". Then in your parser setup a system of these XML nodes in the same fashion as you read them. Then search through that body and find the element that you would like to change. Change it. Then write a function that goes through these "node" objects and writes a new NSString in XML format and save that string to file. There is no real easy way that I know of to write XML files. I'm sure someone has a library out there to do it, but I had very complex XML's to deal with so I wrote my own. If you would like specific code let me know and I can try to give you parts of what you may need.
You Can use GDATAXML for changing XML node
Here is Working Code snippet
NSString *XMLString = #"<Dat><Name>Tom</Name><Option>1</Option></Dat>";
NSError *error = nil;
GDataXMLElement *newElement = [[GDataXMLElement alloc] initWithXMLString: XMLString error: &error];
NSLog(#"New element: %# error: %#", newElement, error);
if(nil == error)
{
GDataXMLElement *childElement = [[newElement elementsForName: #"Name"] objectAtIndex: 0];
[childElement setStringValue:#"Jim"];
childElement = [[newElement elementsForName: #"Option"] objectAtIndex: 0];
[childElement setStringValue:#"2"];
}
NSLog(#"New element now: %#", newElement);
Check by using this code snippet
Have tried storing my NSMutableArray's object to NSUserDefaults but, no luck.
My NSMutableArray contains this log right here:
`ALAsset - Type:Photo, URLs:assets-library://asset/asset.JPG?id=92A7A24F-D54B-496E-B250-542BBE37BE8C&ext=JPG`
I know that its a ALAsset object, in the AGImagePickerController it is compared as NSDictionary, so what I needed to do is save the NSDictionary or the Array I used to where I store my ALAsset object then save it in either in NSDocu or NSCaches as a file then retrieve it again (This was my idea).
But the problem is,Though I tried this code but not working, and doesn't display anything in NSDocu or NSCache Directories.
First try (info is the one that contains ALAsset object):
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *basePath = ([paths count] > 0) ? [paths objectAtIndex:0] : nil;
NSString *filePath = [basePath stringByAppendingPathComponent:#"filename.plist"];
NSDictionary *dictionary = [NSDictionary dictionaryWithContentsOfURL:filePath];
NSString *error;
NSData *plistData = [NSPropertyListSerialization dataFromPropertyList:plistDict format:NSPropertyListXMLFormat_v1_0 errorDescription:&error];
if(plistData) {
[info writeToFile:filePath atomically:YES];
} else {
NSLog(error);
}
Second try:
- (NSString *)createEditableCopyOfFileIfNeeded:(NSString *)_filename {
// First, test for existence.
BOOL success;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *writableFilePath = [documentsDirectory stringByAppendingPathComponent: _filename ];
success = [fileManager fileExistsAtPath:writableFilePath];
if (success) return writableFilePath;
// The writable file does not exist, so copy the default to the appropriate location.
NSString *defaultFilePath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent: _filename ];
success = [fileManager copyItemAtPath:defaultFilePath toPath:writableFilePath error:&error];
if (!success) {
NSLog([error localizedDescription]);
NSAssert1(0, #"Failed to create writable file with message '%#'.", [error localizedDescription]);
}
return writableFilePath;
}
Save it this way:
NSString *writableFilePath = [self createEditableCopyOfFileIfNeeded:[NSString stringWithString:#"hiscores"]];
if (![info writeToFile:writableFilePath atomically:YES]){
NSLog(#"WRITE ERROR");
}
Third try:
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:??????];
[info writeToFile:filePath atomically:YES];
Fourth try(Unsure of because of its modifying in the appbundle):
https://stackoverflow.com/a/6311129/1302274
Is there other way? Hope someone would guide me.
You can store your NSMutableArray to NSUserDefault by archiving it to NSData and than retrieving it by Unarchiving it back to NSMutableArray.
-(NSData*) getArchievedDataFromArray:(NSMutableArray*)arr
{
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:arr];
return data;
}
-(NSMutableArray*) getArrayFromArchievedData:(NSData*)data
{
NSMutableArray *arr = [NSKeyedUnarchiver unarchiveObjectWithData:data];
return arr;
}
For saving array to NSUserDefault :
[[NSUserDefaults standardUserDefaults] setObject:[self getArchievedDataFromArray: yourArray] forKey:#"YourKey"];
[[NSUserDefaults standardUserDefaults] synchronize];
For retrieving array back from NSUserDefault :
NSMutableArray *yourArray = [self getArrayFromArchievedData:[[NSUserDefaults standardUserDefaults]objectForKey:#"YourKey"]];
Also you can save Array in form of NSData to a file in NSDocumentDirectory or NSCachesDirectory. Hope this helps....
Edited: An UIImage+NSCoding category
.h file
#import <UIKit/UIKit.h>
#interface UIImage (NSCoding)
- (id) initWithCoderForArchiver:(NSCoder *)decoder;
- (void) encodeWithCoderForArchiver:(NSCoder *)encoder ;
#end
.m file
#import "UIImage+NSCoding.h"
#import <objc/runtime.h>
#define kEncodingKey #"UIImage"
#implementation UIImage (NSCoding)
+ (void) load
{
#autoreleasepool {
if (![UIImage conformsToProtocol:#protocol(NSCoding)]) {
Class class = [UIImage class];
if (!class_addMethod(
class,
#selector(initWithCoder:),
class_getMethodImplementation(class, #selector(initWithCoderForArchiver:)),
protocol_getMethodDescription(#protocol(NSCoding), #selector(initWithCoder:), YES, YES).types
)) {
NSLog(#"Critical Error - [UIImage initWithCoder:] not defined.");
}
if (!class_addMethod(
class,
#selector(encodeWithCoder:),
class_getMethodImplementation(class, #selector(encodeWithCoderForArchiver:)),
protocol_getMethodDescription(#protocol(NSCoding), #selector(encodeWithCoder:), YES, YES).types
)) {
NSLog(#"Critical Error - [UIImage encodeWithCoder:] not defined.");
}
}
}
}
- (id) initWithCoderForArchiver:(NSCoder *)decoder {
if (self = [super init]) {
NSData *data = [decoder decodeObjectForKey:kEncodingKey];
self = [self initWithData:data];
}
return self;
}
- (void) encodeWithCoderForArchiver:(NSCoder *)encoder {
NSData *data = UIImagePNGRepresentation(self);
[encoder encodeObject:data forKey:kEncodingKey];
}
#end
The documentation of NSArray for the "writeToFile:atomically:" method, shows that all members must be property list objects. ALAsset is not a property list object, so writing that to a file is not going to work.
I know that its a ALAsset object, in the AGImagePickerController it is
compared as NSDictionary
If you looked carefully then you would have seen that it does not compare ALAsset's, but their 'ALAssetPropertyURLs' property. The value of that property is an NSDictionary.
As ALAsset does not have a public constructor, there is no way you can reconstruct it after reading from a file or NSUserDefaults, even if you manage to write it.
So the best thing you can do is to re-fetch the ALAssets from the source that you originally got them from. I assume that is an ALAssetsGroup? Instead of saving to file and retrieving again, why don't you just regenerate them with the same query on ALAssetsGroup as you originally used to generate them?
EDIT:
So you say you got the original ALAsset's from an AGImagePickerController. In order to store them, you can take Matej's advice in the comments and store the URLs that identify them.
But keep in mind that AGImagePickerController is a means for the user to pick a number of photos and then do something with them. That is, the ALAssets are simply intermediare results pointing to the original locations of the photos. If you store the URL's and retrieve them later, there is no guarantee at all that the originals are still there.
So ask yourself: what is it that you want the user to do with the photos, and store the result of that action, rather than the assets themselves. For example, one reasonable action you could do is to create a new ALAssetGroup (with the addAssetsGroupAlbumWithName: method on ALAssetsLibrary), and store the assets in there. ALAssetGroups are automatically saved, so you don't need to do anything yourself for that.
EDIT 2 - after more information from the OP
What Matej hints at in the comments, is to convert the array of ALAssets that you have into an array of dictionaries by retrieving the urls from the assets. As you can read in the ALAsset class documentation you can do that in the following way:
NSArray *assetArray = // your array of ALAssets
NSMutableArray *urls = [NSMutableArray arrayWithCapacity:assetArray.count];
for( ALAsset *asset in assetArray ) {
NSDictionary *urlDictionary = [asset valueForProperty:#"ALAssetPropertyURLs"];
[urls addObject:urlDictionary];
}
The resulting array of dictionaries you can save in any way you like.
After restart of your app, you read the array of dictionaries back from where you stored it. Then Matej suggests to use ALAssetsLibrary's assetForURL:resultBlock:failureBlock: to recreate the ALAssets. But as we now know you want to put a checkmark on the original assets again, it is better to fetch the original array of ALAssets, and check whether any of them are present in the recovered urls. The following should work for that:
NSArray *assetArray = // the full array of ALAssets from AGImagePickerController
NSArray *urls = // the recovered array of NSDictionaries
for( ALAsset *asset in assetArray ) {
NSDictionary *urlDictionary = [asset valueForProperty:#"ALAssetPropertyURLs"];
if( [urls containsObject:urlDictionary] ) {
... // set checkmark on asset
}
}
This assumes the original assets have not changed, which is not under your control (the user has removed/added photos, for example).
This is the method I use for storing array or dictionary objects.
- (NSArray*)readPlist
{
NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSString *plistPath = [[documentPaths lastObject] stringByAppendingPathComponent:#"filename.plist"];
NSFileManager *fMgr = [NSFileManager defaultManager];
if (![fMgr fileExistsAtPath:plistPath]) {
[self writePlist:[NSArray array]];
}
return [NSArray arrayWithContentsOfFile:plistPath];
}
- (void)writePlist:(NSArray*)arr
{
NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSString *plistPath = [[documentPaths lastObject] stringByAppendingPathComponent:#"filename.plist"];
NSFileManager *fMgr = [NSFileManager defaultManager];
if ([fMgr fileExistsAtPath:plistPath])
[fMgr removeItemAtPath:plistPath error:nil];
[arr writeToFile:plistPath atomically:YES];
}
I am studying iPhone development and facing a problem with a reading/writing plist file. I followed an example from a iPhone development book but keep getting an error message when running.
The error message says : 2012-04-26 00:21:09.759 FileHandling[5915:207] -[__NSCFDictionary addObject:]: unrecognized selector sent to instance 0x685ac40
Here is the example code (it seems fine to me...though):
NSString *plistFileName = [[self documentPath] stringByAppendingPathComponent: #"Apps.plist"];
NSLog(#"Where is the file? => %#", plistFileName);
if ([[NSFileManager defaultManager] fileExistsAtPath:plistFileName]) {
NSDictionary *dict = [[NSDictionary alloc] initWithContentsOfFile:plistFileName];
for (NSString *category in dict) {
NSLog(#"%#", category);
NSLog(#"=========");
NSArray *titles = [dict valueForKey:category];
for (NSString *title in titles) {
NSLog(#"%#", title);
}
}
} else {
NSString *plistPath = [[NSBundle mainBundle] pathForResource:#"Apps" ofType: #"plist"];
NSLog(#"%#", plistPath);
NSDictionary *dict = [[NSDictionary alloc] initWithContentsOfFile: plistPath];
NSLog(#"Let's take a look : %#", dict);
NSMutableDictionary *copyOfDict = [dict mutableCopy];
NSLog(#"Let's look at the mutable dictationary : %#", copyOfDict);
NSArray *categoriesArray = [[copyOfDict allKeys] sortedArrayUsingSelector: #selector(compare:)];
for (NSString *cateogry in categoriesArray) {
NSArray *titles = [dict valueForKey: cateogry];
NSMutableArray *mutableTitles = [titles mutableCopy];
[mutableTitles addObject: #"New App Title"];
[copyOfDict setObject: mutableTitles forKey:cateogry];
}
NSString *fileName = [[self documentPath] stringByAppendingPathComponent: #"Apps.plist"];
[copyOfDict writeToFile: fileName atomically:YES];
}
According to the error message, the problem is occurring in the call to addObject: on an __NSCFDictionary. This means that, at runtime, a dictionary received a message to add an object.
However, in this code snippet, addObject: is apparently being sent to an NSMutableArray. This probably means that each object titles you're retrieving from dict in the last for-loop is not an array, but in fact another dictionary, that your code is simply referring to as an array.
Indeed, your code does seem well-formed, so check the well-formedness of your source plist; open it up in a plain text editor. Also, you use a ton of logging, so confirm this way: in the output, dictionaries (including the root entry) are denoted by {curly = braces}, where arrays are denoted by (round parentheses).
- (void)viewDidLoad
{
[super viewDidLoad];
if ([[NSFileManager defaultManager] fileExistsAtPath:pathString])
{
infoDict = [[NSMutableDictionary alloc] initWithContentsOfFile:pathString];
}
else
{
infoDict = [[NSMutableDictionary alloc]initWithObjects:[NSArray arrayWithObjects:#"BeginFrame",#"EndFrame", nil] forKeys:[NSArray arrayWithObjects:[NSNumber numberWithBool:YES],[NSNumber numberWithBool:YES], nil]];
if ([infoDict writeToFile:pathString atomically:YES])
{
NSLog(#"Created");
}
else
{
NSLog(#"Is not created");
NSLog(#"Path %#",pathString);
}
}
This is my code. I check if file is created, if not - I create a NSMutableDictionary and I write it to file at path, but writeToFile method returns NO. Where is problem? If I create this file with NSFileManager it works, but doesn't when I want to write a dictionary.
writeToFile:atomically only works if the dictionary you call it on is a valid property list object (see docs).
For a NSDictionary to be a valid property list object, among other things, its keys must be strings, but in your example the keys are NSNumber instances.
You can not control the content you are going to write sometimes. For example, you can't avoid a null value when you are going to write a JSON object that is gotten from a server.
NSData is compatible with these "invalid" values, so converting NSArray or NSDictionary to NSData is an ideal way in these cases.
write:
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:jsonObject];
[data writeToFile:path atomically:YES];
read:
NSData *data = [NSData dataWithContentsOfFile:path];
NSDictionary *jsonObject = [NSKeyedUnarchiver unarchiveObjectWithData:data];