I am having a little bit trouble with copying files from an online place to the Documents Directory of the iPad in xcode.
The files that i want to download had to be the files with the extension 'xml'.
now i am doing this:
NSData *onlineLink = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:#"http://localhost:8888/"]];
NSString *extension = #"xml";
NSFileManager *fileManager = [NSFileManager defaultManager];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSArray *contents = [fileManager contentsOfDirectoryAtPath:onlineLink error:NULL];
NSEnumerator *e = [contents objectEnumerator];
NSString *filename;
while ((filename = [e nextObject])) {
if ([[filename pathExtension] isEqualToString:extension]) {
[fileManager copyItemAtPath:[documentsDirectory stringByAppendingPathComponent:filename toPath:documentsDirectory error:NULL]];
}
}
However this does not work, i get this error:
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSConcreteData fileSystemRepresentation]: unrecognized selector sent to instance 0xb000800'
Can anybody give me a hint why i am getting the error?
in the line:
NSArray *contents = [fileManager contentsOfDirectoryAtPath:onlineLink error:NULL];
contentsOfDirectoryAtPath should be an NSString, you are passing an NSData object
Related
I am trying to enumerate files and folders at root level
(/Users/Myname/Desktop or /Users/Myname/Documents),[enumarator nextobject] always gives nil value.
How can i solve this issue.
NSDirectoryEnumerator* enumerator = [[NSFileManager defaultManager] enumeratorAtPath:#"/Users/Myname/Desktop"];
NSString *content= [enumerator nextObject];//content always nil.
Try this:
NSFileManager *fileManager = [NSFileManager defaultManager];
NSDirectoryEnumerator * emuerator = [fileManager enumeratorAtPath:#"/usr/Myname/Desktop"];
NSString *filename; while ((filename = [emuerator
nextObject]))
{
NSLog (#"file! %#", filename);
}
OR
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSFileManager *manager = [[NSFileManager alloc] init];
NSDirectoryEnumerator *emuerator= [manager enumeratorAtPath: #"/usr/Myname/Desktop"];
for (NSString *filename in emuerator) {
// Do something with file
}
[manager release];
I am trying to read NSData from a file path, and eventually unarchive the data.
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docs = [paths objectAtIndex:0];
[[NSFileManager defaultManager] createDirectoryAtPath:[docs stringByAppendingString:#"/dynSplash"]
withIntermediateDirectories:NO
attributes:nil
error:nil];
NSString *dynamicSplashFile = [docs stringByAppendingString:#"/dynSplash/dynamicSplash.data"];
DynamicSplash *splash;
if([[NSFileManager defaultManager] fileExistsAtPath:dynamicSplashFile]) {
NSLog(#"Dynamic splash exists");
NSData *data = [NSData dataWithContentsOfFile:dynamicSplashFile];
splash = [NSKeyedUnarchiver unarchiveObjectWithData:data];
}
The problem arises on the line [NSData dataWithContentsOfFile:dynamicSplashFile] where a EXC_BAD_ACCESS error is bring thrown.
How can I debug this?
I use the following code to copy a Resources plist file into the documents directory:
BOOL success;
NSError *error;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:#"Test-Info.plist"];
success = [fileManager fileExistsAtPath:filePath];
if (!success) {
NSString *path = [[[NSBundle mainBundle] resourcePath] stringByAppendingFormat:#"Test-Info.plist"];
success = [fileManager copyItemAtPath:path toPath:filePath error:&error];
NSLog(#"Test-Info.plist successfully copied to DocumentsDirectory.");
}
I get the success message, which is great. I'm assuming it's been copied correctly into the documents folder.
However when I then try to read and write to the saved plist file it returns null:
Key entry in Test-Info.plist:
Key: EnableEverything
Type: Boolean
Value: YES
Write code:
NSString *adKey = #"EnableEverything";
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectoryPath = [paths objectAtIndex:0];
NSString *path = [documentsDirectoryPath stringByAppendingPathComponent:#"Test-Info.plist"];
NSMutableDictionary *plist = [NSDictionary dictionaryWithContentsOfFile: path];
NSString *enableEverything = [[plist valueForKey:adKey] stringValue];
NSLog(#"****** EXISTING: %# ******", enableEverything); // returns (null)
// Disable in plist.
[plist setValue:0 forKey:adKey]; // will this work?
[plist writeToFile:path atomically:YES]; // this doesn't throw an error?
NSString *enableEverything1 = [[plist valueForKey:adKey] stringValue];
NSLog(#"****** NOW: %# ******", enableEverything1); // returns (null)
Output:
****** EXISTING: (null) ******
****** NOW: (null) ******
My question is why are they (null) when they exist within the plist file?
You are trying to mutate an immutable object.
You need a NSMutableDictionary.
IE
NSMutableDictionary *plist = [[NSDictionary dictionaryWithContentsOfFile: path] mutableCopy];
Also check, if the plist object isnt nil, as any messages can be send to nil without raiing an error. this wouldnt fail, also nothing actually happens.
[plist setValue:0 forKey:adKey]; // will this work?
[plist writeToFile:path atomically:YES]; // this doesn't throw an error?
as the source path is nil, you are most like not copying the file during compilation bundling. drag it here:
Try this for nsbundle path for resource
NSString *path= [[NSBundle mainBundle] pathForResource:#"SportsLogo-Info" ofType:#"plist"];
Try allocating
NSMutableDictionary *plist = [[NSMutableDictionary alloc] initWithDictionary:[NSDictionary dictionaryWithContentsOfFile:path]];
Also check if the file has been copied or not. Go to Library=>Application Support=>iPhone Simulator=>folder named your version of simulator iOS=>Applications=>Find the right folder of your project=>Documents see if the plist file is there
I have a UITextField and when the user hits a save button, the text should be saved into a plist file with the following code:
-(IBAction)saveButtonPressed
{
NSError *error;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); //1
NSString *documentsDirectory = [paths objectAtIndex:0]; //2
NSString *path = [documentsDirectory stringByAppendingPathComponent:#"Data.plist"]; //3
NSFileManager *fileManager = [NSFileManager defaultManager];
if (![fileManager fileExistsAtPath: path]) //4
{
//5
NSString *bundle=[[NSBundle mainBundle] pathForResource:#"Data" ofType:#"plist"];
[fileManager copyItemAtPath:bundle toPath: path error:&error]; //6
}
NSMutableDictionary *data = [[NSMutableDictionary alloc] initWithContentsOfFile: path];
//here add elements to data file and write data to file
[data setObject:[inkTextField text] forKey:#"inkText"];
BOOL didWrite=[data writeToFile: path atomically:YES];
if(didWrite==YES)
NSLog(#"didWrite");
else NSLog(#"nope");
[data release];
}
Then I have a UITableView and I want to load the string value of plist into the cell text field with the following code:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"CellViewController"];
if (cell == nil) {
// Load the top-level objects from the custom cell XIB.
NSArray *topLevelObjects = [[NSBundle mainBundle] loadNibNamed:#"CellViewController" owner:self options:nil];
// Grab a pointer to the first object (presumably the custom cell, as that's all the XIB should contain).
cell = [topLevelObjects objectAtIndex:0];
}
NSError *error;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); //1
NSString *documentsDirectory = [paths objectAtIndex:0]; //2
NSString *path = [documentsDirectory stringByAppendingPathComponent:#"Data.plist"]; //3
NSFileManager *fileManager = [NSFileManager defaultManager];
if (![fileManager fileExistsAtPath: path]) //4
{
//5
NSString *bundle=[[NSBundle mainBundle] pathForResource:#"Data" ofType:#"plist"];
[fileManager copyItemAtPath:bundle toPath: path error:&error]; //6
}
NSMutableDictionary *savedInks = [[NSMutableDictionary alloc] initWithContentsOfFile: path];
//load from savedStock example int value
NSString *value;
value = [[savedInks objectForKey:#"inkText"]stringValue];
[savedInks release];
inkTitle.text=value;
return cell;
}
When I save, I get a the log outputs didWrite, so I know it saved properly. However when I visit the tableView, I get a crash with the following error:
2011-08-19 13:56:45.717 MyApp[36067:b303] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSCFString stringValue]: unrecognized selector sent to instance 0x4bb5fa0'
So I thought it was something to do with this line:
value = [[savedInks objectForKey:#"inkText"]stringValue];
so I tried
value = [savedInks objectForKey:#"inkText"];
but that also causes a crash but with no message. What am I doing wrong?
You should remove the 'stringValue', as you're already returning a NSString value.
In the next line, you're releasing 'savedInks', before retaining 'value'. Swap the release with the line below it and see if that works.:
NSString *value;
value = [savedInks objectForKey:#"inkText"];
inkTitle.text=value;
[savedInks release];
When savedInks is released, all of the objects within the dictionary are released as well. Setting inkTtile.text should perform a retain on value automatically.
This is probably a very easy problem to solve but i have not succeeded. I have copied the file "questions_famquiz_easy_110326.txt" to the resources folder and now want to access (read) it and NSLog it to see that i am able to read it.
The code below is from one of the tests i have done based on examples that i have found on the web.
I am trying to access a txt-file in the Resources folder and fail to do so. I have searched for a solution, tested a lot, but not succeeded.
I am testing with the following code:
NSLog(#"\n \n >>>>>>viewDidLoad<<<<<<<<<");
NSError *error;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *docsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *filePath = [docsDirectory stringByAppendingPathComponent:#"questions_famquiz_easy_110326.txt"];
if(![fileManager fileExistsAtPath:filePath])
{
NSData *data = [NSData dataWithContentsOfFile:[[[NSBundle mainBundle] resourcePath] stringByAppendingString:#"/questions_famquiz_easy_110326.txt"]];
[data writeToFile:filePath atomically:YES];
}
NSString *myString = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:&error];
NSLog(#"myString: %#", myString);
NSLog(#"\n \n>>>>>>DONE WITH viewDidLoad<<<<<<<<<");
exit(0); //====EXIT JUST FOR THE TEST====<<<
The above code is located in the first viewController that is started.
The output i get is:
>>>>>>viewDidLoad<<<<<<<<<
2011-04-24 21:53:47.825 FamQuiz_R0_1[542:307] myString: (null)
2011-04-24 21:53:51.044 FamQuiz_R0_1[542:307]
>>>>>>DONE WITH viewDidLoad<<<<<<<<<
Could someone nice help me to solve this?
update:
Here is the filePath:
2011-04-24 22:38:08.562 FamQuiz_R0_1[637:307] filePath: /var/mobile/Applications/7F5FDB03-0D22-46BC-91BC-4D268EB4BBEB/FamQuiz_R0_1.app/questions_famquiz_easy_110326.txt
Here is where i have placed the file:
PROBLEM SOLVED:
NSString *myString = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:&error];
When i used the above it did not work, when i used the below it worked and printed out the text.
NSString *myString = [[NSString alloc] initWithContentsOfFile:filePath];
You're not reading from the resources folder. You're trying to read from the document directory. So getting back nil makes sense since the file doesn't exist there.
Change:
NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *docsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *filePath = [docsDirectory stringByAppendingPathComponent:#"questions_famquiz_easy_110326.txt"];
to:
NSString *filePath = [[NSBundle mainBundle] pathForResource:#"questions_famquiz_easy_110326" ofType:#"txt"];
and it should work for you.