无法读取/写入plist

Question

I've looked into other users similar problems but I still can't find the problem with my code.

Here is the problem.

When the app start I call a method called setupDirectory that create (or copy from app bundle if needed) one plist for names and one for configs:

@implementation Data

static NSString * NamePlist;
static NSString * ConfigPlist;

+(void) setupDirectory
{

    //Names
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString * dataPath = [paths objectAtIndex:0];
    dataPath = [dataPath stringByAppendingPathComponent:@"NamesPlist.plist"];
    NSFileManager *fileManager = [NSFileManager defaultManager];

    if (![fileManager fileExistsAtPath:dataPath]) {
        NSString *sourcePath = [[NSBundle mainBundle] pathForResource:@"NamesPlist" ofType:@"plist"];
        [fileManager copyItemAtPath:sourcePath toPath:dataPath error:nil];
    }

    //Config
    NSString *configPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
    configPath = [configPath stringByAppendingPathComponent:@"ConfigPlist.plist"];

    if (![fileManager fileExistsAtPath:configPath]) {
        NSString *sourcePath = [[NSBundle mainBundle] pathForResource:@"ConfigPlist" ofType:@"plist"];
        [fileManager copyItemAtPath:sourcePath toPath:configPath error:nil];
    }

NamePlist = dataPath;
ConfigPlist = configPath;

}

Then when I need to add a name I call the method Add name to add to the plist the name:

+(void) addName: (NSString *) name andConfigs: (NSArray *) configs
{
    // Name

    // Get the old content of the plist file
    NSDictionary *oldContent = [NSDictionary dictionaryWithContentsOfFile:Namelist];
    // Copy the old content of the plist file to a new dictionary
    NSMutableDictionary * newContent = [oldContent mutableCopy];
    //Add the new config to the dictionary
    [newContent setObject:[NSNull null] forKey:name];
    // Set the new dictionary as the plist file
    [newContent writeToFile:NamePlist atomically:YES];

    //Configs

    oldContent = [NSDictionary dictionaryWithContentsOfFile:ConfigPlist];
    // Copy the old content of the plist file to a new dictonary
    newContent = [oldContent mutableCopy];
    //Add the new config to the dictionary
    [newContent setObject:configs forKey:name];
    // Set the new dictionary as the plist file
    [newContent writeToFile:ConfigPlist atomically:YES];
}

But when I need to get the information from the plist I get nothing, so it didn't write?

+(NSArray *) getAllNames
{
    NSDictionary * names = [NSDictionary dictionaryWithContentsOfFile:NamePlist];
    NSArray * allNames = [(NSArray*) [names allKeys] sortedArrayUsingSelector:@selector(caseInsensitiveCompare:)];
    return allNames;
}

GetallNames return an empty array.

Sorry if this question has already been answered, but I really looked for and still don't know what's going wrong

EDIT 1:

I used the return values of writeToFile to check if anything fail. I'm getting a YES with the writeToFile from configsPlist, but a NO with writeToFile from NamesPlist. So I think config is working fine, but not namesPlist

EDIT 2:

Using the debugger I notice that ![fileManager fileExistsAtPath:configPath] and !fileManager fileExistsAtPath:dataPath] are return NO so I'm not actually getting into these if statments.

Solution

Ok, I gave it another chance and tried to create with a string instead of the [NSNull null] and now it works... I thought I should use [NSNull null] to create a dictionary with null object

Answer 1

I suggest to go to the documents directory : /Users/administrator/Library/Application Support/iPhone Simulator/YourApp/Documents/ and check the plist every time you add any item in it. With you can confirm if the "NamesPlist.plist" and "ConfigPlist" are getting updated or not.