I am using following code to read the details of the plist,
NSString *plistPath = #"~/Library/Preferences/com.apple.desktop.plist";
NSDictionary *plistData = [NSDictionary dictionaryWithContentsOfFile:plistPath];
But plistData has no entries.
Is there something wrong in above code?
You need expanding the tilde. Try this:
NSString * plistPath = [#"~/Library/Preferences/com.apple.desktop.plist" stringByExpandingTildeInPath];
Related
I am using this to get the log files data:
NSFileHandle *file;
file = [NSFileHandle fileHandleForReadingAtPath:#"~/Library/Application Support/RepoManager/*.log"];
NSData *filedata;
filedata = [file readDataToEndOfFile];
NSString *logC;
logC = [[NSString alloc] initWithData:filedata encoding:NSASCIIStringEncoding];
And than write them using this:
NSString *formatString = #"Log: %#";
return [NSString stringWithFormat:formatString, *logC.stringValue];
But it says logC does not contain a string value
NSString does not define a .stringValue property, and even if it did, *logC.stringValue would have no useful meaning in Objective-C. logC itself is what you want to be using as your format parameter. (It's the string containing the contents of the log file.)
I am really new to saving files in objective C but what I'm trying to accomplish is reading a plist file located in the documents directory on launch or creating it if it doesn't exist.
It should be read in to a NSMutableDictionary. Later on in the app I should be able to save items to the NSMutableDict with categories as keys + text.
The before launch in the viewWillUnload the NSMutableDictionary should be saved into the plist file again.
I have created the plist but I need a way to write to the NSMutableDictionary the right way (category and my result.text string.
And I also need to save the NSMutableDictionary to the plist file and read the plist into the dictionary on launch.
Some help with this would be awsome :D
Thanks guys.
In the savefile void I am doing this:
storeDict = [[ NSMutableDictionary alloc]
init];
[storeDict setObject:resultText.text forKey:#"kvitto"];
[storeDict setObject:kategori forKey:#"kategori"];
[storeDict writeToFile:[self saveFilePath] atomically:YES];
saveFilePath looks like this:
- (NSString *) saveFilePath {
NSArray *path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
return [[path objectAtIndex:0] stringByAppendingString:#"savefile.plist"];
}
The values are strings collected from a code that the user have scanned so don't worry bout them.
Well so how do I save this correctly keeping the data that already exists in the savefile.plist.
Thanks again
If you want dictionaries and arrays contained in the dictionary to be mutable as well then do the following:
NSData *data = [NSData dataWithContentsOfFile:path];
NSError *error;
storeDict =
[NSPropertyListSerialization
propertyListWithData:data
options:NSPropertyListMutableContainersAndLeaves
format:nil
error: &error];
Why can't you use writeToFile api? Before writing question here you must google or check apple documentation for NSMutableDictionary.
[dict writeToFile:path atomically:YES];
To load saved dictionary
dict = [NSMutableDictionary dictionaryWithContentsOfFile:path];
Happy coding!
I retrieved a NSURL from a NSSavePanel. I now have this NSURL which gives me the following:
file://localhost/Users/brett/Documents/asdf%20asdf.json
Now, it is easy for me to retrieve just the filename using something like the following:
[[[NSFileManager defaultManager] displayNameAtPath:pathAndFilename] stringByDeletingPathExtension]
This gives me just the localized filename, as expected: asdf%20asdf
So, how do I get the path, like so: file://localhost/Users/brett/Documents/
-[NSURL URLByDeletingLastPathComponent] is the simplest way to achieve this.
You could use NSString methods to work with file paths. For example,
NSString *directory = [[URL absoluteString] stringByDeletingLastPathComponent];
NSString *filename = [[URL absoluteString] lastPathComponent];
You could find other useful methods in Apple Docs: NSString Class Reference -> Working with Paths section
Directly from your NSSavePanel:
NSSavePanel *savePanel;
...
NSString *path = savePanel.directoryURL.path;
I'm trying to read ~/Library/Preferences/com.apple.mail.plist (on Snow Leopard) to get the email address and other information to enter into the about dialog. I'm using the following code, which is obviously wrong:
NSBundle* bundle;
bundle = [NSBundle mainBundle];
NSString *plistPath = [bundle pathForResource:#"~/Library/Preferences/com.apple.mail.plist" ofType:#"plist"];
NSDictionary *plistData = [NSDictionary dictionaryWithContentsOfFile:plistPath];
NSString *item = [plistData valueForKeyPath:#"MailAccounts.Item 2.AccountName"];
NSLog(#"Result = %#", item);
Moreover, the value I need to read is MailAcounts -> Item 2 -> AccountName and I am not sure I am doing this correctly (due to the space in the Item 2 key).
I tried reading Apple's developer guide to plist files but no help there.
How can I read a plist and extract the values as an NSString?
Thanks.
The first level is an array, so you need to use "MailAccounts.AccountName" and treat it as NSArray*:
NSString *plistPath = [#"~/Library/Preferences/com.apple.mail.plist" stringByExpandingTildeInPath];
NSDictionary *plistData = [NSDictionary dictionaryWithContentsOfFile:plistPath];
NSArray *item = [plistData valueForKeyPath:#"MailAccounts.AccountName"];
NSLog(#"Account: %#", [item objectAtIndex:2]);
Alternatively you can go by keys and pull the array from "MailAccounts" first using valueForKey: (which will yield NSArray*) and then objectAtIndex: to get the dictionary of that particular account (useful if you need more than the name).
Two things:
You don't want or need to use NSBundle to get the path to the file. The file lies outside of the app bundle. So you should just have
NSString *plistPath = #"~/Library/Preferences/com.apple.mail.plist";
You have to expand the tilde in the path to the user directory. NSString has a method for this. Use something like
NSString *plistPath = [#"~/Library/Preferences/com.apple.mail.plist" stringByExpandingTildeInPath];
I'm trying to use this line of code
[UIImagePNGRepresentation(image, 1.0) writeToFile:pngPath atomically:YES];
But obviously pngPath is undeclared. So I have to use stringByAppendingPathComponent.
I googled examples of this, and I found this
myPlistPath = [documentsDirectory stringByAppendingPathComponent:
[NSString stringWithFormat: #"%#.plist", plistName] ];
[myPlistPath retain]
;
The problem is that I don't have a plist file, because I don't need one. How can I solve all these issues and writeToFile the UIImage image?
I don't fully understand your question, but to get the full path where your file should be saved, you could try this:
NSString *file = #"myfile.png";
NSString *directory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES) objectAtIndex:0];
NSString *path = [directory stringByAppendingPathComponent: file];
and then:
[UIImagePNGRepresentation(image) writeToFile:path atomically:YES];