I have this code:
NSString *studentList = _textIn.text;
NSString *path = [[self applicationDocumentsDirectory].path
stringByAppendingPathComponent:#"ClassOne.txt"];
[studentList writeToFile:path atomically:YES
encoding:NSUTF8StringEncoding error:nil];
NSLog(#"%#", studentList);
NSLog(#"students 1 saved");
I try to write to a text file on the phone system. When I try to read from that file with:
NSError *error;
NSString *strFileContent = [NSString stringWithContentsOfFile:[[NSBundle mainBundle]
pathForResource: #"classOne" ofType: #"txt"] encoding:NSUTF8StringEncoding error:&error];
_textIn.text = strFileContent;
The textfield comes up blank. The NSLog prints what was in the text field but when I try to load it up later the textfield is empty. how do I get the textfield to display what is in the file.
The writing part is alright. You are trying to read the file from your application main bundle instead of your original file path.
Related
I have an iOS application which is download from server an XML file encoded in Windows 1252.
I am using the following code to save it to my document folder :
NSString *path = #"http://server/file.xml";
NSURL *URL = [NSURL URLWithString:[path stringByAddingPercentEscapesUsingEncoding:NSWindowsCP1252StringEncoding]];
NSData *xmlData = [NSData dataWithContentsOfURL:URL];
if(xmlData == nil) {
// Error - handle appropriately
NSLog(#"ERROR");
}
NSString *applicationDocumentsDir=[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
NSString *storePath=[applicationDocumentsDir stringByAppendingPathComponent:#"annonces.xml"];
[xmlData writeToFile:storePath atomically:TRUE];
NSLog(#"write xml");
It doesn't work, I've got an nil response when I try to read it with the parser. How could I do to get it properly. I cannot change the encoding of te xml which is on the server. If I change the XML encoding manually, I've got a correct response.
This is how I pass the XML string to parse it with XML Dictionnary class :
NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *finalPath = [path stringByAppendingPathComponent:#"annonces.xml"];
NSString *string = [[NSString alloc] initWithContentsOfFile:finalPath encoding:NSWindowsCP1252StringEncoding error:NULL];
NSLog(#"string: %#", string);
NSDictionary *items = [NSDictionary dictionaryWithXMLString:string];
NSLog(#"dictionary: %#", items);
Your URL variable contains the url address of the location of the XML file you want to download.
However you are applying NSWindowsCP1252StringEncoding to the url, not to the content of the file.
xmlData is nil because dataWithContentsOfURL: cannot find the file at the location you have specified within URL.
You need to download the file first, then once its downloaded then you can be concerned about what encoding its in and how to parse it.
The way you are using NSWindowsCP1252StringEncoding has got nothing to do with the content of the file.
- (void)viewDidLoad
{
[super viewDidLoad];
NSFileManager * fileManager =[[NSFileManager alloc]init];
NSArray *Apath=[fileManager URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask];
NSString *FilePath=[[Apath objectAtIndex:0] absoluteString];
NSString *TEST =[FilePath stringByAppendingPathComponent:#"test10.txt"];
BOOL flage =[[NSFileManager defaultManager] fileExistsAtPath:TEST];
if (flage)
{
NSLog(#"It's exist ");
}
else
{
NSLog(#"It is not here yet ");
NSData * data =[[NSData alloc]initWithContentsOfURL:[NSURL URLWithString:#"www.google.com"]];
[data writeToFile:TEST atomically:YES];
}
}
I'm just trying to create a text file , it always give me "It is not here yet"
Anything wrong with the code ??
You haven't created a file, you have only created a file path: you need to write a file to that path.
//after these lines ... (I've improved your variable names)
NSArray *paths=[fileManager URLsForDirectory:NSDocumentDirectory
inDomains:NSUserDomainMask];
NSString *filePath=[[paths objectAtIndex:0] absoluteString];
filePath =[filePath stringByAppendingPathComponent:#"test10.txt"];
//try this
NSString* fileContent = #"some text to save in a file";
BOOL success = [fileContent writeToFile:filePath
atomically:YES
encoding:NSUTF8StringEncoding
error:nil]
But watch out - file existence tests come with a warning from Apple:
Note: Attempting to predicate behavior based on the current state of the file system or a particular file on the file system is not recommended. Doing so can cause odd behavior or race conditions. It's far better to attempt an operation (such as loading a file or creating a directory), check for errors, and handle those errors gracefully than it is to try to figure out ahead of time whether the operation will succeed.
I've created a T&C for my app in TextMate. Then pasted it to a .rtf file created by XCode.
The content of the file is shown but I can see back-slashes when there are line breaks. What am I missing that this is happening?
NSError *e = Nil;
NSString * tc = [NSString stringWithContentsOfFile:[[NSBundle mainBundle] pathForResource:#"termsAndConditions" ofType:#"rtf"] encoding:NSUTF8StringEncoding error:&e];
NSLog(#"%#",e);
tvView.text = tc;
.rtf file always contains Tags with itself for formating text color alignment and other properties, Try using a .txt file instead.
In TextEdit> Create a .txt file>Copy the contents from .rtf to .txt and use it.
You can use the same code by just renaming the file type.
NSError *e = Nil;
NSString * tc = [NSString stringWithContentsOfFile:[[NSBundle mainBundle] pathForResource:#"termsAndConditions" ofType:#"txt"] encoding:NSUTF8StringEncoding error:&e];
NSLog(#"%#",e);
tvView.text = tc;
Couldn't you just replace the backslashes with blank ?
Such as
tc = [tc stringByReplacingOccurrencesOfString:#"\" withString:#""];
Pulling my hair out trying to work this out. i want to read and write a list of numbers to a txt file within my project. however [string writeToFile:path atomically:YES encoding:NSUTF8StringEncoding error:&error] doesnt appear to write anything to the file. I can see there is the path string returns a file path so it seems to have found it, but just doesnt appear to write anything to the file.
+(void)WriteProductIdToWishList:(NSNumber*)productId {
for (NSString* s in [self GetProductsFromWishList]) {
if([s isEqualToString:[productId stringValue]]) {
//exists already
return;
}
}
NSString *string = [NSString stringWithFormat:#"%#:",productId]; // your string
NSString *path = [[NSBundle mainBundle] pathForResource:#"WishList" ofType:#"txt"];
NSError *error = nil;
[string writeToFile:path atomically:YES encoding:NSUTF8StringEncoding error:&error];
NSLog(#"%#", error.localizedFailureReason);
// path to your .txt file
// Open output file in append mode:
}
EDIT: path shows as /var/mobile/Applications/CFC1ECEC-2A3D-457D-8BDF-639B79B13429/newAR.app/WishList.txt so does exist. But reading it back with:
NSString *path = [[NSBundle mainBundle] pathForResource:#"WishList" ofType:#"txt"];
returns nothing but an empty string.
You're trying to write to a location that is inside your application bundle, which cannot be modified as the bundle is read-only. You need to find a location (in your application's sandbox) that is writeable, and then you'll get the behavior you expect when you call string:WriteToFile:.
Often an application will read a resource from the bundle the first time it's run, copy said file to a suitable location (try the documents folder or temporary folder), and then proceed to modify the file.
So, for example, something along these lines:
// Path for original file in bundle..
NSString *originalPath = [[NSBundle mainBundle] pathForResource:#"WishList" ofType:#"txt"];
NSURL *originalURL = [NSURL URLWithString:originalPath];
// Destination for file that is writeable
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSURL *documentsURL = [NSURL URLWithString:documentsDirectory];
NSString *fileNameComponent = [[originalPath pathComponents] lastObject];
NSURL *destinationURL = [documentsURL URLByAppendingPathComponent:fileNameComponent];
// Copy file to new location
NSError *anError;
[[NSFileManager defaultManager] copyItemAtURL:originalURL
toURL:destinationURL
error:&anError];
// Now you can write to the file....
NSString *string = [NSString stringWithFormat:#"%#:", yourString];
NSError *writeError = nil;
[string writeToFile:destinationURL atomically:YES encoding:NSUTF8StringEncoding error:&error];
NSLog(#"%#", writeError.localizedFailureReason);
Moving forward (assuming you want to continue to modify the file over time), you'll need to evaluate if the file already exists in the user's document folder, making sure to only copy the file from the bundle when required (otherwise you'll overwrite your modified file with the original bundle copy every time).
To escape from all the hassle with writing to a file in a specific directory, use the NSUserDefaults class to store/retrieve a key-value pair. That way you'd still have hair when you're 64.
I know this is probably a silly question but I'm storing most of my game data in a plist - with that I'd like to include references to images used within my game - same hierarchal level as 'supporting files'. I have different types of images stored in 3 separate folders. One folder for example is called imageclue. How could I store the path in my plist, I'm stuck because I can't just store the path in my plist as string - filename.jpg. I've tried getting the path of the file but when I log it out it .
Sorry if I'm not explaining well and thank you in advance for any help :)
EDIT**
I have a plist file added to my program I don't want to programatically add to it as the images are constants - the screenshots below show a tutorial instead of the filename.jpg (because that won't work seen as my images are stored in a file) I wondered what path name do I use as a string.
The image is from a tutorial off of appcoda.com - where it says thumbnails are the image path files. If you look at where the images are stored on the left - they are stored with the program files. My images are in a folder in there so I'm confused as to what to enter in my plist for the image file.
Hope this clears up what I meant, sorry :)
Store three variables in .h file
#interface YourViewController : UIViewController
{
NSString *folder1;
NSString *folder2;
NSString *folder3;
}
in viewdidload:
-(void) viewdidLoad
{
//get the documents directory:
NSArray *paths = NSSearchPathForDirectoriesInDomains
(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
//getting the folder name:
folder1 = [NSString stringWithFormat:#"%#/imageclue",
documentsDirectory];
folder2 = [NSString stringWithFormat:#"%#/folder2",
documentsDirectory];
folder3 = [NSString stringWithFormat:#"%#/folder3",
documentsDirectory];
}
-(NSArray*) getPlistFromFolder:(NSString*)folder imageName:(NSString*)image
{
NSString *imageTitle = [NSString stringWithFormat:#"%#/image",
folder];
NSArray *data = [[NSArray alloc] initWithContentsOfFile:plistName];
return data;
}
So in the plist file, just store the image name.
Hope this helps...
Do it like this,
NSDictionary *imagePaths = #{#"image 1": [NSHomeDirectory() stringByAppendingPathComponent:#"image 1"]};
[self writeToPlist:imagePaths];
- (void)writeToPlist:imagePaths:(id)plist{
NSError *error;
NSData *data = [NSPropertyListSerialization dataWithPropertyList:plist format:kCFPropertyListXMLFormat_v1_0 options:0 error:&error];
if(error){
NSLog(#"Could not write to file");
return;
}
[data writeToFile:[self plistPath] atomically:YES];
}
Like wise loading is simple as this;
[self loadImagePathForImageNamed:#"image 1"];
- (NSString*)loadImagePathForImageNamed:(NSString*)imageName{
}
- (NSString*)loadImagePathForImageNamed:(NSString*)imageName{
NSData *data = [NSData dataWithContentsOfFile:[self plistPath]];
NSString *error;
NSPropertyListFormat format;
NSDictionary *dictionary = [NSPropertyListSerialization propertyListFromData:data mutabilityOption:NSPropertyListImmutable format:&format errorDescription:&error];
if(error){
NSLog(#"Could not open plist %#", error);
return nil;
}
return dictionary[imageName];
}
You may have to handle the error when the file is not there by creating a new one, otherwise this should work.
You are storing path right way, just need to store filename of image with extension in plist when your images are in your Application Bundle, for more reference you can define key name Instead "item1", "item2" in your plist.
Now coming to actual Question, how to access image from plist
Step 1 : Read your recipes.plist from Application Bundle
NSString *bundlePath = [[NSBundle mainBundle] pathForResource:#"recipes" ofType:#"plist"];
NSDictionary *dict = [NSDictionary dictionaryWithContentsOfFile:bundlePath];
Step 2 : Now Get Image/Thumbnails name out of it, which you want to load
Step 3 : Define following Function in your Controller, which returns image from name
- (UIImage *)getImageWithName:(NSString *)imageFileName
{
NSString *ext = [imageFileName pathExtension];
NSString *imagePath = [[NSBundle mainBundle] pathForResource:[imageFileName stringByDeletingPathExtension] ofType:ext];
return [UIImage imageWithContentsOfFile:imagePath];
}
HOW TO USE
Suppose you want to load Image with key "Item2" then write following code
NSString *imageFileName = [[dict objectForKey:#"Thumbnail"] valueForKey:#"Item2"];
UIImage *item2Image = [self getImageWithName:imageFileName];
For "Item6"
NSString *imageFileName1 = [[dict objectForKey:#"Thumbnail"] valueForKey:#"Item6"];
UIImage *item6Image = [self getImageWithName:imageFileName1];