I'm currently making a web browsing program in Xcode 4.5.1 for OS X and I am trying to work on a list of bookmarks. What I hope to do is to have a supporting file called Bookmarks.txt in which I would list bookmarks like this:
Google
http://www.google.com/
Apple
http://www.apple.com/
Microsoft
http://www.microsoft.com/
I have already looked at a lot of pages discussing this, but none of them apply to what I'm doing. What I have now is
NSMutableArray *list;
NSString *contents;
NSString *filePath = [[NSBundle mainBundle] pathForResource:#"Bookmarks" ofType:#"txt"];
if (filePath) {
content = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil];
for (NSString *line in [contents componentsSeparatedByString:#"\n"]) {
[list addObject:line];
}
}
as well as Dave DeLong's method, but I get all kinds of errors with Dave DeLong's and with this one nothing happens. Any help would be great, but I am just starting out at Xcode and know very little.
Thanks!
Your objects aren't initialized.
NSMutableArray *list = [[NSMutableArray alloc] init];
NSString *filePath = [[NSBundle mainBundle] pathForResource:#"Bookmarks" ofType:#"txt"];
if (filePath) {
NSString * content = [NSString initWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil];
for (NSString *line in [contents componentsSeparatedByString:#"\n"]) {
[list addObject:line];
}
}
Related
Alright.. Here's the thing.. I am building an app in which when the user taps on download button it downloads a bunch on images (296, to be exact).
In simulator everything works flawless, on my iPhone (4S) on around 100th image it crashes with error:
malloc: * mach_vm_map(size= "some random number") failed (error code= 3)* error: can't allocate region
libBacktraceRecording.dylib: allocate_free_list_pages() -- virtual memory exhausted!
Here's the code I wrote for downloading those images:
-(void)getData
{
NSError *error;
int i;
NSArray *brojLinije = [[NSArray alloc] initWithContentsOfFile:[[NSBundle mainBundle] pathForResource:#"linije" ofType:#"plist"]];
NSArray *urlSlike = [[NSArray alloc] initWithContentsOfFile:[[NSBundle mainBundle]pathForResource:#"urlSlike" ofType:#"plist"]];
NSArray *pocetno = [[NSArray alloc] initWithContentsOfFile:[[NSBundle mainBundle]pathForResource:#"pocetno" ofType:#"plist"]];
NSArray *sortiranje = [[NSArray alloc] initWithContentsOfFile:[[NSBundle mainBundle]pathForResource:#"sort" ofType:#"plist"]];
NSArray*paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *desktopDir = [paths firstObject];
UIImage *image1 = [[UIImage alloc] init];
for (i = 0; i<296; i++) {
NSString *brojLinije1 = [NSString stringWithFormat:#"%#",[brojLinije objectAtIndex:i]];
NSString *pocetno1 = [NSString stringWithFormat: #"%#", [pocetno objectAtIndex:i]];
NSString *tableSort = [NSString stringWithFormat: #"%#", [sortiranje objectAtIndex:i]];
image1 = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:[NSString stringWithFormat: #"http://www.busevi.com/images/stories/Red-Voznje/Gradski-Prevoz-BG/linija.%#.png", [urlSlike objectAtIndex:i ] ]]]];
NSData *data1 = [NSData dataWithData:UIImageJPEGRepresentation(image1, 0.1)];
NSManagedObjectContext *context = [self.fetchedResultsController managedObjectContext];
NSEntityDescription *entity = [[self.fetchedResultsController fetchRequest] entity];
NSManagedObject *newManagedObject = [NSEntityDescription insertNewObjectForEntityForName:[entity name] inManagedObjectContext:context];
NSString *pngFilePath = [NSString stringWithFormat:#"%#%#.jpg",desktopDir,[urlSlike objectAtIndex:i]];
[data1 writeToFile:pngFilePath atomically:YES];
[newManagedObject setValue:brojLinije1 forKey:#"brojLinije"];
[newManagedObject setValue:data1 forKey:#"imageData"];
[newManagedObject setValue:pocetno1 forKey:#"pocetnoStajaliste"];
[newManagedObject setValue:tableSort forKey:#"sort"];
NSLog(#"%d / 296", i);
}
[self.managedObjectContext save:&error];
}
Only thing I know is that the image allocation frequency (too much allocating and no time to automatically release) is making the problem, AND that I have tried every method I know so far, AND I HAVE watched A LOT of "Instruments" app tutorials and only one helped (to find the source of filling virtual memory) but I still can't solve my problem.
You can use a local autorelease pool inside of the loop to immediately release any objects that were created in the body of the loop.
for (i = 0; i<296; i++) {
#autoreleasepool {
// loop body goes here...
}
}
While using SDWebImage framework I encountered a lot of bugs and unanswered crashes from the app. SDWebImage is awesome if the count of images that are about to be downloaded is lower that, let's say 50. Because, when downloading one by one image that are showed in TableViewCell + fast scrolling (fast flicking), the app receives memory warning a couple of times while the TableView is still scrolling (SDWebImage will clear memory ONLY when TableView is slowly scrolling or not scrolling at all) so it crashes the app.
So my only solace with app crashing while downloading 300+ images was simple Apple's method called dispatch_async. More about it here.
And this is how I solved my problem (I just had to move everything from my original -(void)getdata method to dispatch_async block. DONE!
So now it looks like this:
-(void)getData {
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSLog(#"Downloading Started");
slike = [[NSArray alloc]initWithContentsOfFile:[[NSBundle mainBundle] pathForResource:#"slike" ofType: #"plist"]];
brojevi = [[NSArray alloc]initWithContentsOfFile:[[NSBundle mainBundle] pathForResource:#"linije" ofType:#"plist"]];
pocetnaStajalista = [[NSArray alloc]initWithContentsOfFile:[[NSBundle mainBundle] pathForResource:#"pocetno" ofType:#"plist"]];
sort = [[NSArray alloc]initWithContentsOfFile:[[NSBundle mainBundle]pathForResource:#"sort" ofType:#"plist"]];
NSEntityDescription *entity = [NSEntityDescription entityForName:#"Linija" inManagedObjectContext:self.managedObjectContext];
NSString *brojLinije;
NSString *pocetnoStajaliste;
NSString *sortiranje;
NSData *data;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [NSString stringWithFormat:#"%#/%#", documentsDirectory,#"filename.png"];
for (int i = 0; i<314; i++) {
NSManagedObject *novaLinija = [[NSManagedObject alloc]initWithEntity:entity insertIntoManagedObjectContext:self.managedObjectContext];
brojLinije = [NSString stringWithFormat:#"%#",brojevi[i]];
pocetnoStajaliste = [NSString stringWithFormat:#"%#",pocetnaStajalista[i]];
data = [NSData dataWithContentsOfURL:[NSURL URLWithString:[NSString stringWithFormat: #"http://www.busevi.com/images/stories/Red-Voznje/Gradski-Prevoz-BG/linija.%#.png",slike[i]]]];
[data writeToFile:filePath atomically:YES];
sortiranje = [NSString stringWithFormat: #"%#", sort[i]];
[novaLinija setValue:data forKey:#"slikaLinije" ];
[novaLinija setValue:brojLinije forKey:#"brojLinije"];
[novaLinija setValue:pocetnoStajaliste forKey:#"pocetnoStajaliste"];
[novaLinija setValue:sortiranje forKey: #"sort"];
NSLog(#"%d / 314", i+1);
NSError *error;
[self.managedObjectContext save:&error];
} }
Hope this helps others with same problem. Good Luck and Happy Coding!
Used all of your and my suggestions and possible solutions, but, I'm sorry, none worked.
The point in this case, when app needs to download A LOT of photos, you really should use SDWebImageDownloader Class Reference.
I know It's frustrating to change the whole method and to realize the previous method (of downloading photos) is useless, so HERE is the tutorial and example on how to use SDWebImageDownloader Class. Good Luck.
I'm trying to make an xcode plugin that needs to write something to the .h file from the .m file. I haven't been able to find a stackoverflow post with an answer on how to do this. I've tried this code
NSData *data = [NSData dataWithContentsOfFile:filePath];
NSString *contents = [[NSString alloc] initWithBytes:[data bytes] length:[data length] encoding:NSUTF8StringEncoding];
I've also tried using the StringWithContentsOfFile method, however they both return nil. Is it because you can't read an .h file with this code or is it something else I'm missing.
filePath is this and it's a correct filepath, my ftp client can read it atleast file:///Users/myUserName/Documents/code/macOsDev/XcodePlugIns/XcoderPlugin/XcoderPlugin/XcoderPlugin.h
So my question is, how do I read and write to a .h file? Thanks in advance.
EDIT as requested, some more code however this is as far as I've gotten to the read/write part of my plugin.
NSString *filePath = path;
NSData *data = [NSData dataWithContentsOfFile:filePath];
NSString *contents = [[NSString alloc] initWithBytes:[data bytes] length:[data length] encoding:NSUTF8StringEncoding];
NSError *error;
NSString *contents1 = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:&error];
contents is #"" because data is nil
and contents1 is just nil;
error is error
NSError * domain: #"NSCocoaErrorDomain" - code: 260
in the debugger, but I'm not sure I'm using this error thing correctly.
Use "/Users/myUserName/Documents/code/macOsDev/XcodePlugIns/XcoderPlugin/XcoderPlugin/XcoderPlugin.h".
Dont use 'file://' prefix
Following is the code for reading and writing
NSString *path = #"your/path/tp/.h/file";
NSData *data = [NSData dataWithContentsOfFile:path];
//Get the contents of the file into the mutable string
NSMutableString *contents = [[NSMutableString alloc] initWithBytes:[data bytes] length:[data length] encoding:NSUTF8StringEncoding];
//Make changes to your mutable string
[contents appendString:#"abc"];
//Write it back to the file
[contents writeToFile:path atomically:YES encoding:NSUTF8StringEncoding error:nil];
This question already has answers here:
Working with data in iOS Apps (What to choose? NSData, CoreData, sqlite, PList, NSUserDefaults)
(2 answers)
Closed 9 years ago.
I've been struggling with this for ages now and I really need some good help here. :)
I have an app where I'm parsing a quite big JSON into appdelegate's didFinishLaunchingWithOptions.
My Model Objects are:
Tab:
NSString *title
NSMutableArray *categories
Category:
NSString *title
NSMutableArray *items
Item
NSString *title
NSString *description
UIImage *image
I need to save the data locally, cause the parsing takes about 15 seconds every time my app starts. I'm using the SBJSON framework.
Here's my code for parsing:
NSString *filePath = [[NSBundle mainBundle] pathForResource:#"json_template" ofType:#"json"];
NSString *contents = [NSString stringWithContentsOfFile: filePath encoding: NSUTF8StringEncoding error: nil];
SBJsonParser *jsonParser = [[SBJsonParser alloc] init];
NSMutableDictionary *json = [jsonParser objectWithString: contents];
tabs = [[NSMutableArray alloc] init];
jsonParser = nil;
for (NSString *tab in json)
{
Tab *tabObj = [[Tab alloc] init];
tabObj.title = tab;
NSDictionary *categoryDict = [[json valueForKey: tabObj.title] objectAtIndex: 0];
for (NSString *key in categoryDict)
{
Category *catObj = [[Category alloc] init];
catObj.name = key;
NSArray *items = [categoryDict objectForKey:key];
for (NSDictionary *dict in items)
{
Item *item = [[Item alloc] init];
item.title = [dict objectForKey: #"title"];
item.desc = [dict objectForKey: #"description"];
item.url = [dict objectForKey: #"url"];
if([dict objectForKey: #"image"] != [NSNull null])
{
NSURL *imgUrl = [NSURL URLWithString: [dict objectForKey: #"image"]];
NSData *imageData = [NSData dataWithContentsOfURL: imgUrl];
item.image = [UIImage imageWithData: imageData];
}
else
{
UIImage *image = [UIImage imageNamed: #"standard.png"];
item.image = image;
}
[catObj.items addObject: item];
}
[tabObj.categories addObject: catObj];
}
[tabs addObject: tabObj];
}
What is the best way of doing this? Using Core Data or NSFileManager?
If you have som code example too it will make me very happy.
This is the last thing i need to fix before the app is ready for app store and it just kills me! I can't solve this problem.
If you are working on iOS then you save a file to the Documents folder. On Mac OS X it would be in the Application Support folder. Since you are on iOS, read this answer for how to access the Documents folder.
All of the objects that you want to store should implement NSCoding. The above variables already do. Should you want to store the tabs, categories and items directly they would need to implement NSCoding. Then all you need is to serialize them to a file. When opening you app you can look for this file and get your objects back without parsing.
The code should look something like this (untested and error checking is ommited for brevity):
- (void) saveStateToDocumentNamed:(NSString*)docName
{
NSError *error;
NSFileManager *fileMan = [NSFileManager defaultManager];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docPath = [paths[0] stringByAppendingPathComponent:docName];
if ([fileMan fileExistsAtPath:docPath])
[fileMan removeItemAtPath:docPath error:&error];
// Create the dictionary with all the stuff you want to store locally
NSDictionary *state = #{ ... };
// There are many ways to write the state to a file. This is the simplest
// but lacks error checking and recovery options.
[NSKeyedArchiver archiveRootObject:state toFile:docPath];
}
- (NSDictionary*) stateFromDocumentNamed:(NSString*)docName
{
NSError *error;
NSFileManager *fileMan = [NSFileManager defaultManager];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docPath = [paths[0] stringByAppendingPathComponent:docName];
if ([fileMan fileExistsAtPath:docPath])
return [NSKeyedUnarchiver unarchiveObjectWithFile:docPath];
return nil;
}
I'm creating a Mac app and I want to localize my Labels. I thought a .strings file would be a better choice. But I have trouble reading .strings file in Objective-C. I'm looking for a simpler method.
This is my .string file content:
"LABEL_001" = "Start MyApp";
"LABEL_002" = "Stop MyApp";
"LABEL_003" = "My AppFolder";
...
I have already looked at http://developer.apple.com/library/mac/#documentation/cocoa/conceptual/LoadingResources/Strings/Strings.html.
This is my code:
NSBundle *bundle = [NSBundle mainBundle];
NSString *strFilePath = [[NSBundle mainBundle] pathForResource:#"Labels" ofType:#"strings"];
NSString *tt =NSLocalizedStringFromTableInBundle(#"LABEL_001",strFilePath,bundle, nil);
NSLog(#"STRING ::: %#",tt);
But the string tt gives "LABEL_001", I want "Start MyApp"
What am I doing wrong?
One. You have to name your file Localizable.strings in the <LANGUAGENAME>.lproj directory in the app bundle.
Two. Use the NSLocalizedString macro:
NSString *loc = NSLocalizedString(#"LABEL_001", nil);
Three. If nothing works, you can initialize an NSDictionary using a strings file, as a strings file is a special type of plist:
NSString *fname = [[NSBundle mainBundle] pathForResource:#"whatever" ofType:#"strings"];
NSDictionary *d = [NSDictionary dictionaryWithContentsOfFile:fname];
NSString *loc = [d objectForKey:#"LABEL_001"];
NSString *path = [[NSBundle mainBundle] pathForResource:#"Labels" ofType:#"strings"];
NSData *plistData = [NSData dataWithContentsOfFile:path];
NSString *error; NSPropertyListFormat format;
NSDictionary *dictionary = [NSPropertyListSerialization propertyListFromData:plistData
mutabilityOption:NSPropertyListImmutable
format:&format
errorDescription:&error];
NSString *stringname = [dictionary objectForKey:#"LABEL_001"];
I think it will be helpful to you.
Here the your code
NSBundle *bundle = [NSBundle mainBundle];
NSString *strFilePath = [[NSBundle mainBundle] pathForResource:#"Labels" ofType:#"strings"];
NSString *tt =NSLocalizedStringFromTableInBundle(#"LABEL_001",strFilePath,bundle, nil);
NSLog(#"STRING ::: %#",tt);
The problem here is the 2nd Param "strFilePath", change it to #"Labels" so the above code would become,
NSString *tt =NSLocalizedStringFromTableInBundle(#"LABEL_001",#"Labels",bundle, nil);
For reference, the following line copied from Apple Docs regarding table name,
"When specifying a value for this parameter, include the filename without the .strings extension."
hope this helps.
Simple Code
Just create a method as follows
- (void)localisationStrings
{
NSString* path = [[NSBundle mainBundle] pathForResource:#"localisation" ofType:#"strings"];
NSDictionary *localisationDict = [NSDictionary dictionaryWithContentsOfFile:path];
NSLog(#"\n %#",[localisationDict objectForKey:#"hello"]);
}
This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
How to write to plist successfully?
i m trying to write to test.plist file, which is stored in my supporting files,
here is my code
- (IBAction)acceptAction:(id)sender {
NSBundle *mainBundle = [NSBundle mainBundle];
NSString *pathToFile = [mainBundle pathForResource:#"test" ofType:#"plist"];
NSMutableDictionary *md = [[NSMutableDictionary alloc] initWithContentsOfFile:pathToFile];
[md setValue:#"yes" forKey:#"hasAgree"];
[md writeToFile:pathToFile atomically:YES];
}
- (IBAction)declineAction:(id)sender {
NSBundle *mainBundle = [NSBundle mainBundle];
NSString *pathToFile = [mainBundle pathForResource:#"test" ofType:#"plist"];
NSMutableDictionary *md = [[NSMutableDictionary alloc] initWithContentsOfFile:pathToFile];
NSString *value;
value = [md objectForKey:#"hasAgree"];
NSLog(#"value is %#", value);
}
accept action button for wrtting..
decline action button for reading it out..
but not working at all, any suggestions?
You're not allowed to write in your bundle's directory. You have to use the documents directory instead. Search a little and you'll find enlightenment.