i'm new to iPhone programming and coding in XCode SDK.I want to access and read the configuration file which i have placed in Resource folder in XCode,my configuration file looks like this
#key=value$
#vinu=flower$
#cathy=fruit$
I want to compare the key and access the value from configuration file.
Since i'm working with iPhone OS, i cant use NSWorkspace.Hence i'm using NSFileHandle.
This is how my code looks like,
NSString *path = [[NSBundle mainBundle] pathForResource:#"configuration" ofType:#"txt"];
NSFileHandle *readHandle = [NSFileHandle fileHandleForReadingAtPath:path];
NSString *txtString = [[NSString alloc] initWithData:
[readHandle readDataToEndOfFile] encoding:NSUTF8StringEncoding];
please let me know is the procedure correct, and how to proceed. ??
Thank You.
Do yourself a favor and save it as a plist, and not a straight text file.
However, if you need to read it in like that, the simplest way is to read it into a string and then go from there, ie:
NSString * fileContents = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];
If the file is super large and the only reasonable way to read it is line-by-line, then you can quickly see that this is something that has come up before (Particularly: Objective-C: Reading a file line by line).
Related
Sorry I saw similar questions but they don't seem to have some full answers for me. And i try to put it in order so that people will not hate me or my poor english.
I am working with Xcode 4.2 with storyboard and ARC
I can read from my plist file. My task is simply to write back the updated value(s) to my plist file.
My plist is contain in "supporting files" sub folder of the main folder (where story-board is things goes). the file is call Global.plist and GlobalValue2 is a element of the file type string.
So the read file part looks like this
NSString *plistfile = [[NSBundle mainBundle] pathForResource:#"Global" ofType:#"plist"];
NSDictionary *dict = [NSDictionary dictionaryWithContentsOfFile:plistfile];
FirstValueTextBox.text = [[dict valueForKey:#"GlobalValue1"] stringValue];
learn it from some handy youtube video works just fine. updates the value to my text box.
The real problem comes in when I write back my plist file. When i try the following
NSString *plistfile = [[NSBundle mainBundle] pathForResource:#"Global" ofType:#"plist"];
NSMutableDictionary *dict = [NSMutableDictionary
dictionaryWithContentsOfFile:plistfile];
[dict setValue:#"ABC" forKey:#"GlobalValue2"];
SecondValueTextBox.text = [dict valueForKey:#"GlobalValue2"];
[dict writeToFile:plistfile atomically:YES];
the result is I really saw a updated value pop up on the second text box, but the plist file remain unchanged.
The following are the break down of my questions and my guess for the problem
I try to use NSDictionary(not NSMutableDictionary) and call setValue (crash in runtime)
my guess: NSDictionary object itself is readonly so it crash me when i say add value. But why don't it error me when in coding time? if the object is readonly
I use NSMutableDictionary can call setValue. it doesn't crash me and when i call the updated value at "SecondValueTextBox.text = [dict valueForKey:#"GlobalValue2"];" it really return me the updated value. but the content inside of the plist file is not changed. Which is the result I have right now.
my guess: after some search here and there I think "supporting files" is read only too. pure guess did see anyone directly talk about it.
I did try to move on a little more and some people talks about a "document folder" in Xcode that is a read and write place. I think people also talk about write a code to access that folder. Can someone show me the code here.
My last question, can I hook up my Xcode to that "document folder" or where can i see it(the real file folder structure is different from inside Xcode I think). So that i can see and edit my plist file for testing, and i can see the real result without using codes and stuff
I will be much appreciated if people can tell me my guess is right or wrong and the answer to my 3 and 4 question.
In order for your changes to be persisted in your plist, you would indeed need ot copy it from the resource bundle to the documents dirtectory on launch of the application, then use the plist in the documents to read and write.
Here is how you can copy the file:
NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *plistPath = [documentsDirectory stringByAppendingPathComponent:#"Global.plist"];
if ([fileManager fileExistsAtPath:plistPath] == NO) {
NSString *resourcePath = [[NSBundle mainBundle] pathForResource:#"Global" ofType:#"plist"];
[fileManager copyItemAtPath:resourcePath toPath:plistPath error:&error];
}
I recorded sound in file called "recordedTmpFile".now i want to send the file to server .
i tried this code
NSString *filePath = [[NSBundle mainBundle] pathForResource:#"recordedTmpFile" ofType:#"caf"];
NSData *postData = [filePath dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
//nsdata to string
NSString *content = [[NSString alloc] initWithBytes:[postData bytes]
length:[postData length] encoding: NSUTF8StringEncoding];
am getting null value in "content"
please help me to fix this problem
Did your app record the sound and write it into the file? Remember that the app bundle is read-only, so if you tried to write the file to a location in the main bundle, as your code seems to indicate, then the write operation probably failed. If that's the case, then of course there's no file to read or send.
Try changing the path to which you record data to someplace in the documents directory, which is writeable.
I'm doing:
NSString *current_path = [[NSBundle mainBundle] bundlePath];
NSString *string_path = [NSString stringWithFormat:
#"%#/filedstring", current_path];
my_string_ = [[NSKeyedUnarchiver unarchiveObjectWithFile:string_path] retain];
The archived string is the text from a UITextField which we unarchive here. I've tried with and without current_path.
This all works fine when running in simulator (class member NSString *my_string_ is not nil) but when run on my iPhone my_string_ is nil.
Why is that?
Thanks for the quick responses all.
Adding to Jason Coco's answer, archive to and unarchive here:
NSString *library_path = [NSSearchPathForDirectoriesInDomains(NSLibraryDirectory,
NSUserDomainMask, YES) objectAtIndex:0];
NSString *username_path = [library_path
stringByAppendingPathComponent:#"Caches/filedstring"];
You can't write into the main bundle on the phone, it's not allowed. That's why you don't find your archive there later. The simulator, since it actually runs on Mac OS X doesn't work this way, so it will actually write the file.
If you need to write something, you have to use one of the writeable paths available to your application. For more information, see the iOS Application Programming Guide / The File System. If you're going to do iOS Application Development, you should definitely read and understand this entire document.
As #middaparka says, there is probably something wrong with that file. Here's how I would debug this problem:
First step,
[[NSFileManager defaultManager] fileExistsAtPath: string_path];
Second step,
NSError *err;
NSString *tmp = [NSString stringWithContentsOfFile:string_path encoding:NSUTF8StringEncoding error:&err];
NSLog(#"Contents of string %#",tmp);
Once you've done those, you should have a much clearer idea why your NSKeyedUnarchiver is failing.
Also, check out NSString's stringByAppendingPathComponent: method.
I am fairly new to iphone development and programming in general and am wondering how to read some text from a text file to be diplayed in a UITextView. I have tried various ways to do it but just can't seem to be able to get it to display:
- (void)viewDidLoad {
[super viewDidLoad];
NSString *filePath=[[NSBundle mainBundle] pathForResource:#"untitled" ofType:#"txt"];
NSString *someText=[NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil];
textView.text=someText;
Some sample code would be greatly appreciated. Thanks in advance
You shouldn't include the extension in the pathForResource: parameter:
[[NSBundle mainBundle] pathForResource:#"untitled.txt" ofType:#"txt"]
should be
[[NSBundle mainBundle] pathForResource:#"untitled" ofType:#"txt"].
I had to change the name of the text file to 'untitled.txt' from just plain 'untitled' in Xcode. It was a text file but didn't have the extension of .txt. This doesn't seem to be automatically appended if you create the text file in Xcode.
Is untitled.txt actually where you think it is? Try logging filePath and see if it's what you expect. (You could do [[NSFileManager defaultManager] isReadableFileAtPath:filePath] to be completely certain.)
If the path is correct then the problem must be with loading the text. One such problem could be that the file is not encoded in UTF8. Mike Ash recently blogged about character encoding. At the end of the post he describes how to handle text files of unknown encoding.
How does one read a data file in an iPhone project? For example, lets say I have a static file called "level.dat" that is structured as follows:
obstacles: 10
time: 100
obstacle1: 10,20
...
I would like to read the contents of the file into a NSString then do the parsing. How do I read the contents of a file into a string? Also, where in the project should the "level.dat" file reside? Should it be under "Resources" or just in the main directory?
Thanks in advance!
See this answer: How to fopen() on the iPhone? which shows how to get access to resources in your bundle. Once you have the path, just use [NSString stringWithContentsOfFile:encoding:error:].
NSString *path = [[NSBundle mainBundle] pathForResource: #"level" ofType: #"dat"]
NSError *error = nil;
NSString *data = [NSString stringWithContentsOfFile: path
encoding: NSUTF8StringEncoding
error: &error];
While this isn't what you asked for, consider turning your files into plists. You will have to reformat them into XML, but then you can load them straight into a NSDictionary with:
dict = [NSDictionary dictionaryWithContentsOfFile:[[NSBundle mainBundle] pathForResource:#"levels" ofType:#"plist"]];
Have you considered putting the data in an SQLite database instead of a flat file? I find that the API is very easy to use on the iPhone.
It is how I do all of my data storage on the phone now.
If you need help parsing the data string, there's a helpful article on Cocoa For Scientist