If i enumerate an array i get
<myArray: 0x71b26b0>
<myArray: 0x71b2830>
<myArray: 0x71b2900>
I could take it that myData is behind the pointers listed, but if I wanted to explicitly see (log) the contents at each address, how to do that?
I have tried the &myData to no avail
--
for the benefit of uchuugaka:
-(void)loadObservedItems{
NSString *path = [self observationFilePath];
if ([[NSFileManager defaultManager] fileExistsAtPath:path]) {
NSData *data = [[NSData alloc] initWithContentsOfFile:path];
NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];
myArray = [unarchiver decodeObjectForKey:#"ObserveKey"];
[unarchiver finishDecoding];
} else {
myArray = [[NSMutableArray alloc] initWithCapacity:10];
}
NSLog(#" %#",myArray);
}
Add to MyClass.m:
-(NSString*)description {
NSMutableDictionary* descDict = [NSMutableDictionary dictionary];
[descDict addObject:someField forKey:#"someField"]
[descDict addObject:anotherField forKey:#"anotherField"];
[descDict addObject:yetAnotherField forKey:#"yetAnotherField"];
return [descDict description];
}
Then just use NSLog(#"myObject is %#", myObject);. Just like the big guys.
Slightly more sophisticated is to (within the method) pre-pend your class name and the object address to the result string, but that's usually unnecessary for simple debugging.
But I think you can do that like this:
return [NSString stringWithFormat:#"%# : %#", [super description], [descDict description]];
Related
- (void)readFolder:(NSString *)str :(NSMutableDictionary *)dict {
NSArray *appFolderContents = [[NSArray alloc] init];
appFolderContents = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:str error:nil];
for (NSString *app in appFolderContents) {
if ([app containsString:#".app"])
{
NSString *appName = [[app lastPathComponent] stringByDeletingPathExtension];
NSString *appPath = [NSString stringWithFormat:#"%#/%#", str, app];
NSString *appBundle = [[NSBundle bundleWithPath:appPath] bundleIdentifier];
// NSLog(#"%# -- %#", appPath, appBundle);
NSArray *jumboTron = [NSArray arrayWithObjects:appName, appPath, appBundle, nil];
[dict setObject:jumboTron forKey:appName];
}
}
}
//This searches for apps
- (void)getAPPList {
NSMutableDictionary *myDict = [[NSMutableDictionary alloc] init];
[self readFolder:#"/Applications" :myDict];
[self readFolder:#"/Applications/Utilities" :myDict];
[self readFolder:#"/System/Library/CoreServices" :myDict];
[self readFolder:#"/Volumes/Macintosh HD/Applications" :myDict ];
// Volumes not named 'Macintosh HD' doesn't work, I'm trying to make it work
[self readFolder:#"/Volumes/*/Applications" :myDict ];
//Some apps are stored in the user's Application folder instead of the main one
[self readFolder:[NSString stringWithFormat:#"%#/Applications", NSHomeDirectory()] :myDict];
//Sometimes people keep apps in Downloads
[self readFolder:[NSString stringWithFormat:#"%#/Downloads", NSHomeDirectory()] :myDict];
//Some apps are stored in the user's Library/Application Support sometimes
[self readFolder:[NSString stringWithFormat:#"%#/Library/Application Support", NSHomeDirectory()] :myDict];
I'm trying to make line 26 ([self readFolder:#"/Volumes/*/Applications" :myDict ]) search all volumes, instead of only searching a volume with a matching/specific name. How can I do this?
I'm using Xcode 9.2
something like this should do the trick (untested)
NSArray *keys = [NSArray arrayWithObjects:NSURLVolumeURLKey, NSURLIsVolumeKey, nil];
NSArray *volumeUrls = [[NSFileManager defaultManager] mountedVolumeURLsIncludingResourceValuesForKeys:keys options:NSVolumeEnumerationSkipHiddenVolumes];
for (NSURL *volumeUrl in volumeUrls)
{
BOOL mayBeBootVolume = NO;
NSString* pathToVolume = [volumeUrl path];
[self readFolder: [pathToVolume stringByAppendingString: #"/Applications"];
}
In my iPhone aplication I have a list of custom objects. I need to create a json string from them. How I can implement this with SBJSON or iPhone sdk?
NSArray* eventsForUpload = [app.dataService.coreDataHelper fetchInstancesOf:#"Event" where:#"isForUpload" is:[NSNumber numberWithBool:YES]];
SBJsonWriter *writer = [[SBJsonWriter alloc] init];
NSString *actionLinksStr = [writer stringWithObject:eventsForUpload];
and i get empty result.
This process is really simple now, you don't have to use external libraries,
Do it this way, (iOS 5 & above)
NSArray *myArray;
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:myArray options:NSJSONWritingPrettyPrinted error:&error];
NSString *jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
I love my categories so I do this kind of thing as follows
#implementation NSArray (Extensions)
- (NSString*)json
{
NSString* json = nil;
NSError* error = nil;
NSData *data = [NSJSONSerialization dataWithJSONObject:self options:NSJSONWritingPrettyPrinted error:&error];
json = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
return (error ? nil : json);
}
#end
Although the highest voted answer is valid for an array of dictionaries or other serializable objects, it's not valid for custom objects.
Here is the thing, you'll need to loop through your array and get the dictionary representation of each object and add it to a new array to be serialized.
NSString *offersJSONString = #"";
if(offers)
{
NSMutableArray *offersJSONArray = [NSMutableArray array];
for (Offer *offer in offers)
{
[offersJSONArray addObject:[offer dictionaryRepresentation]];
}
NSData *offersJSONData = [NSJSONSerialization dataWithJSONObject:offersJSONArray options:NSJSONWritingPrettyPrinted error:&error];
offersJSONString = [[NSString alloc] initWithData:offersJSONData encoding:NSUTF8StringEncoding] ;
}
As for the dictionaryRepresentation method in the Offer class:
- (NSDictionary *)dictionaryRepresentation
{
NSMutableDictionary *mutableDict = [NSMutableDictionary dictionary];
[mutableDict setValue:self.title forKey:#"title"];
return [NSDictionary dictionaryWithDictionary:mutableDict];
}
Try like this Swift 2.3
let consArray = [1,2,3,4,5,6]
var jsonString : String = ""
do
{
if let postData : NSData = try NSJSONSerialization.dataWithJSONObject(consArray, options: NSJSONWritingOptions.PrettyPrinted)
{
jsonString = NSString(data: postData, encoding: NSUTF8StringEncoding)! as String
}
}
catch
{
print(error)
}
Try like this,
- (NSString *)JSONRepresentation {
SBJsonWriter *jsonWriter = [SBJsonWriter new];
NSString *json = [jsonWriter stringWithObject:self];
if (!json)
[jsonWriter release];
return json;
}
then call this like,
NSString *jsonString = [array JSONRepresentation];
Hope it will helps you...
I'm a bit late to this party, but you can serialise an array of custom objects by implementing the -proxyForJson method in your custom objects. (Or in a category on your custom objects.)
For an example.
I am uncertain of how memory is managed in my particular case...
I have two methods:
+(NSMutableDictionary *)loadPlist: (NSString*) name
andErrorDesc: (NSString*) errorDesc
andFormat: (NSPropertyListFormat*) format
andplistPath: (NSMutableString*) plistPath
{
NSString * destPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
destPath = [destPath stringByAppendingPathComponent:
[NSString stringWithFormat:#"%#.plist", name]];
if (![[NSFileManager defaultManager] fileExistsAtPath:destPath])
{
[[NSFileManager defaultManager] copyItemAtPath:[[NSBundle mainBundle] pathForResource:name ofType:#"plist"] toPath:destPath error:nil];
}
plistPath = [NSMutableString stringWithString:[destPath copy]];
NSData * plistXML =
[[NSFileManager defaultManager] contentsAtPath:plistPath];
NSLog(#"AFTER plistPath: \n%#",plistPath);
return
(NSMutableDictionary *)[NSPropertyListSerialization
propertyListFromData:plistXML
mutabilityOption:NSPropertyListMutableContainersAndLeaves
format:format
errorDescription:&errorDesc];
}
+(bool)writeToCache:(NSString*) data andField: (NSString*) field
{
NSString * errorDesc = nil;
NSPropertyListFormat format;
NSMutableString * plistPath;
NSMutableDictionary * temp = [BPUtils loadPlist:#"cache" andErrorDesc:errorDesc andFormat:&format andplistPath:plistPath];
if (!temp)
{
NSLog(#"Error reading plist: %#, format: %d", errorDesc, format);
return false;
}
NSMutableArray * arr = [temp objectForKey:field];
[arr addObject:data];
NSLog(#"path: %#",plistPath);
// Write to plist
bool res = [temp writeToFile:plistPath atomically:YES];
NSLog(#"RES: %d", res);
return true;
}
The problem is that the bottom method that sends in "plistPath" to the above method retrives a null plistPath after the above method has set it. Why and how can I fix this?
NSLog(#"path: %#",plistPath);
in the bottom method shows null, why?
I use ARC. Also "destPath" is set and shows the correct path.
I believe you could be a bit confused here.
You are creating plistPath in the bottom method. And then you pass plistPath into
[BPUtils loadPlist:#"cache" andErrorDesc:errorDesc andFormat:&format andplistPath:plistPath];
but plistPath is NULL
NSMutableString * plistPath; // Is NULL
But once it has been passed in the local plistPath takes over.
+(NSMutableDictionary *)loadPlist: (NSString*) name
andErrorDesc: (NSString*) errorDesc
andFormat: (NSPropertyListFormat*) format
andplistPath: (NSMutableString*) plistPath // Notice the local plistPath variable. This is the one you are playing with in this method.
At this point you are setting plistPath but remember it is still just a local variable and not an instance variable. So the button method will never know about it being set, as far as the button method is concerned it is still NULL
plistPath = [NSMutableString stringWithString:[destPath copy]];
So whatever you set in plistPath in the top method will not get passed back to the bottom method, think of the top plistPath as being deallocated when the method does the return.
So the plistPath in the bottom method will remain NULL
So try this instead SOLUTION
static NSMutableString *yourNewStringforPlistPath; //This will be NULL
+(NSMutableDictionary *)loadPlist: (NSString*) name
andErrorDesc: (NSString*) errorDesc
andFormat: (NSPropertyListFormat*) format
andplistPath: (NSMutableString*) plistPath
{
NSString * destPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
destPath = [destPath stringByAppendingPathComponent:
[NSString stringWithFormat:#"%#.plist", name]];
if (![[NSFileManager defaultManager] fileExistsAtPath:destPath])
{
[[NSFileManager defaultManager] copyItemAtPath:[[NSBundle mainBundle] pathForResource:name ofType:#"plist"] toPath:destPath error:nil];
}
yourNewStringforPlistPath = [NSMutableString stringWithString:[destPath copy]];
NSData * plistXML =
[[NSFileManager defaultManager] contentsAtPath:yourNewStringforPlistPath];
NSLog(#"AFTER plistPath: \n%#",yourNewStringforPlistPath);
return
(NSMutableDictionary *)[NSPropertyListSerialization
propertyListFromData:plistXML
mutabilityOption:NSPropertyListMutableContainersAndLeaves
format:format
errorDescription:&errorDesc];
}
+(bool)writeToCache:(NSString*) data andField: (NSString*) field
{
NSString * errorDesc = nil;
NSPropertyListFormat format;
NSMutableDictionary * temp = [BPUtils loadPlist:#"cache" andErrorDesc:errorDesc andFormat:&format andplistPath:[NSNull null]]; // As this is already NULL you don't really need to pass yourNewStringforPlistPath in unless in the future this value can be set before this.
if (!temp)
{
NSLog(#"Error reading plist: %#, format: %d", errorDesc, format);
return false;
}
NSMutableArray * arr = [temp objectForKey:field];
[arr addObject:data];
NSLog(#"path: %#",yourNewStringforPlistPath);
// Write to plist
bool res = [temp writeToFile:yourNewStringforPlistPath atomically:YES];
NSLog(#"RES: %d", res);
return true;
}
I'm having an issue properly accessing an NSDictionary built from Flickr data (the flickr.photosets.getPhotos call). Instead of just showing the content of a description tag, it reads the description tag… along with some unnecessary data and quotes.
For example:
NSLog (#"Item description readout: %#", itemDescriptionPre);
yields this response:
Item description readout: {
"_content" = "This is a caption from a photo drawn through Flickr";
}
I've tried to modify the NSString with this
NSString *descripTruncated = [itemDescriptionPre substringFromIndex:17];
But it didn't causes a crash at runtime. It also doesn't address the items at the end of the item. I apologize since NSString modifications seem to be talked about a lot here, but I couldn't find circumstances that mirror mine.
Here is some more context to my code:
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
NSString *jsonString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSLog(#"Storing incoming data");
NSDictionary *results = [jsonString JSONValue];
NSLog(#"Building NSDictionary.");
NSArray *photos = [[results objectForKey:#"photoset"] objectForKey:#"photo"];
NSLog(#"Building array from dictionary.");
// Loop through each entry in the dictionary...
for (NSDictionary *photo in photos)
{
NSString *title = [photo objectForKey:#"title"];
NSString *description = [photo objectForKey:#"description"];
[photoTitles addObject:title];
[photoDescriptions addObject:description];
}
NSLog(#"Nicer display for results: %# First image title: %# First image description: %#", results, [photoTitles objectAtIndex:0], [photoDescriptions objectAtIndex:0]);
[self updateDisplay];
}
-(void) updateDisplay{
NSString *capTitle = [[photoTitles objectAtIndex:0] uppercaseString];
photoTitleDisplay.text = capTitle;
NSString *itemDescriptionPre = [photoDescriptions objectAtIndex:0];
NSLog (#"Item description readout: %#", itemDescriptionPre);
}
itemDescriptionPre is actually an NSDictionary. This should work:
NSDictionary *itemDescriptionPre = [photoDescriptions objectAtIndex:0];
NSString *itemDescription = [itemDescriptionPre objectForKey:#"_content"];
I'm attempting to complete the Stanford iPhone Programming (FA10) assignement "Flickr Fetcher" -- so far things are going well, however I have come to an impasse:
I have successfully extracted the location of the "Top 100" pictures, which are formated in a string as "Country, State, City". I would like to create two NSStrings -- one being the country, the other string being the State and City. From where I can then do
cell.textLabel.text = countryString;
cell.detailTextLabel.text = stateCityString;
in my table view datasource methods.
From research on stackoverflow and the Apple Documentaion, NSScanner seems to be my best bet -- here is what I have so far...
- (void)viewDidLoad {
//Get the top 100 photos from Flickr
self.topPlacesArray = [FlickrFetcher topPlaces];
NSString *mainLabelString = [[NSString alloc] init];
NSString *stringFromArray = [[NSString alloc] init];
//This retrieves the string of the location of each photo
stringFromArray = [topPlacesArray valueForKey:#"_content"];
NSScanner *theScanner = [NSScanner scannerWithString:stringFromArray];
NSCharacterSet *commaSet = [[NSCharacterSet alloc] init];
commaSet = [NSCharacterSet characterSetWithCharactersInString:#","];
while ([theScanner isAtEnd] == NO) {
if ([theScanner scanUpToCharactersFromSet:commaSet intoString:&stringFromArray]) {
NSLog(#"%#",stringFromArray);
}
}
I'm just trying to see if the string properly substrings itself -- however I am getting a "SIGBART" at the beggining of the while loop, the error is this:
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSArrayI length]: unrecognized selector sent to instance 0x8939eb0'
From all the documentation I have seen on NSScanner, it seems I have it set up properly, however, no matter what changes I do, it seems unable to even begin the loop.
What do I have to do to set up NSScanner properly, to avoid the "SIGABRT"? (for the record, i'm assuming "SIGABRT" is a segfault?). Thank you all for your time, you all are the best!
(Btw: I know this is not fully implemented yet for both country and state-city, i just want to get used to NSScanner, I will implement the rest once I get NSScanner under control)
EDIT 1: SosBorn! You are incredible! Thank you so much! So I have implemented this for my viewDidLoad:
- (void)viewDidLoad
{
self.topPlacesArray = [FlickrFetcher topPlaces];
NSArray *ArrayOfStrings = [[NSArray alloc] init];
NSArray *placeElements = [[NSArray alloc] init];
NSString *country = [[NSString alloc] init];
NSString *city = [[NSString alloc] init];
NSString *state = [[NSString alloc] init];
ArrayOfStrings = [topPlacesArray valueForKey:#"_content"];
for (NSString *place in ArrayOfStrings) {
placeElements = [place componentsSeparatedByString:#", "];
if ([placeElements count] == 3 && [placeElements objectAtIndex:0] != nil) {
city = [placeElements objectAtIndex:0];
[self.cityArray addObject:city];
state = [placeElements objectAtIndex:1];
[self.stateArray addObject:state];
country = [placeElements objectAtIndex:2];
[self.countryArray addObject:country];
NSLog(#"%#, %#, %#", city, state, country);
}
else {
NSLog(#"Did this work?");
}
}
[ArrayOfStrings release];
[placeElements release];
[country release];
[city release];
[state release];
[super viewDidLoad];
}
This worked like a complete charm BUT i'm having some bad access going on in the Delegate when trying to access self.window.rootViewController = self.viewController -- this doesn't make any-sense (i actually have a completely empty table, etc...) -- so i'm thinking I played with bad memory management with my substring-ing and now it gets in trouble with this delegate call.
Chuck, I was very interested in your comment as I was taught that the proper way to make variables is to call [myclass alloc] init]; and then release when you are done -- as I have. Of course my objective-C greenness is showing a bit... blush.
You all and this incredible community are such an asset to us Students -- thank you for all your time and dedication. The only path to progress is a path of cooperation!
EDIT 2: Ok -- now it's totally fixed with no terrible leaking problems. Chuck you were right! I had the pricniples of alloc init completely mixed up in my head -- here was my final solution:
NSMutableArray *array1 = [[NSMutableArray alloc] init];
NSMutableArray *array2 = [[NSMutableArray alloc] init];
NSMutableArray *array3 = [[NSMutableArray alloc] init];
self.cityArray = array1;
self.countryArray = array2;
self.stateArray = array3;
[array1 release];
[array2 release];
[array3 release];
NSArray *ArrayOfStrings = [topPlacesArray valueForKey:#"_content"];
NSArray *topPlaces = [NSArray arrayWithArray:ArrayOfStrings];
NSArray *topPlacesSorted = [topPlaces sortedArrayUsingSelector:#selector(compare:)];
ArrayOfStrings = topPlacesSorted;
for (NSString *place in ArrayOfStrings) {
NSArray *placeElements = [place componentsSeparatedByString:#", "];
if ([placeElements count] == 3 && [placeElements objectAtIndex:0] != nil) {
NSString *city = [placeElements objectAtIndex:0];
[self.cityArray addObject:city];
NSString *state = [placeElements objectAtIndex:1];
[self.stateArray addObject:state];
NSString *country = [placeElements objectAtIndex:2];
NSString *stateAndCountry = [NSString stringWithFormat:#"%#, %#", state, country];
[self.countryArray addObject:stateAndCountry];
NSLog(#"%#, %#, %#", city, state, country);
}
else {
NSLog(#"Nil Request");
}
Thank you again SosBorn, i was feeling like I had forgotten the basics of CS ಠ_ಠ.
The only thing that really bothers me is why do we have to initialize instance NSMutableArrays that way -- i found this was the only way to get them to actually work.
Not totally sure why it is crashing, but I think another approach to this would serve you better. You have a topPlacesArray, why not iterate through the array and process each array entry seperately? I am making some assumptions about the topPlacesArray, but it would look something like this:
for (NSString *place in topPlacesArray)
{
//Place is probably in this format: "Country, State, City"
NSArray *placeElements = [place componentsSeperatedByString:#","];
//This should give you an array with three elements. Country State and city.
NSString *country = [placeElements objectAtIndex:0];
NSString *cityState = [NSString stringWithFormat:#"%#, %#", country, cityState];
//Now you have your strings that you need. Do whatever you need to do with them.
//Add them to an array or set the value of a text label, etc.
}
Didn't take the time to handle memory management but you get the idea.