Question

I’m parsing data from a file if the internet connection is unavailable. When I test this in the iphone simulator it works perfectly. when I switch to the device it fails. When I save and load the data I used the same name with no difference in case. What could be the problem?

- (void)parseXMLFileAtURL:(NSString *)URL
{
    events = [[NSMutableArray alloc] init];

    NSURL *xmlURL = [NSURL URLWithString:URL];

    NSString* xml = [[NSString alloc]initWithContentsOfURL:xmlURL];
    NSData * xmlData = [xml dataUsingEncoding:NSUTF8StringEncoding]; //[[NSData alloc]initWithContentsOfURL:xmlURL];
    if (xmlData != nil) {
        fileParser = [[NSXMLParser alloc] initWithData:xmlData];
        HBSaveData(xmlData, @"/xml.plist");
        NSLog(@"backup made %@ " ,xmlData);
    } else {
        xmlData = [[[NSData alloc]initWithData:HBLoadData(@"/xml.plist")]retain];

        fileParser = [[NSXMLParser alloc]initWithData:xmlData];
        networkConnected = YES;
        NSLog(@"backup used %@ " ,xmlData);
    }

    [fileParser setDelegate:self];

    [fileParser setShouldProcessNamespaces:NO];
    [fileParser setShouldReportNamespacePrefixes:NO];
    [fileParser setShouldResolveExternalEntities:NO];

    [fileParser parse];

}

This is the second issue i’ve had like this and I don’t understand why. I’ve used this same method of saving files 3 other times and now this time it doesn’t want to work. My other question remains unanswered.

Here are the save and load functions

static void HBSaveData(NSData *data, NSString* savePath){
    NSString *filePath = pathOfFile(savePath);
    NSString *errString;
    NSData *serialized =
    [NSPropertyListSerialization dataFromPropertyList:data
                                           format:NSPropertyListBinaryFormat_v1_0
                                 errorDescription:&errString];

[serialized writeToFile:savePath atomically:YES];

if (errString)
{
    NSLog(@"%@" ,errString);
    [errString release]; // exception to the rules
}


//[data writeToFile:filePath atomically:YES];
NSLog(@"%@", filePath);

}

static NSData* HBLoadData(NSString* savePath) {
    NSString *filePath = pathOfFile(savePath);

    NSString *errString;
    NSData *serialized = [NSData dataWithContentsOfFile:savePath];



NSData* data =
[NSPropertyListSerialization propertyListFromData:serialized
                                 mutabilityOption:NSPropertyListMutableContainers
                                           format:NULL
                                 errorDescription:&errString];

if (errString)
{
    NSLog(@"%@" ,errString);
    [errString release]; // exception to the rules
}
return data;

}

static inline NSString* pathOfFile(NSString * savePath){

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsFolder = [paths objectAtIndex:0];
return [documentsFolder stringByAppendingPathComponent:savePath];

}

I performed a test and looked at the contents of the file directory at read and write. on the simulator I have this.

2011-03-31 08:05:39.117 AnimeSTL[5992:207] All documents (
“myEventId.plist”,
“myEvents.plist”,
“myListEvents.plist”,
“xml.dat”
)

On the device I get this

2011-03-31 08:11:10.019 AnimeSTL[134:307] All documents (
“myEventId.plist”,
“myEvents.plist”,
“myListEvents.plist”
)
the file isn’t being saved for some reason.

edit:
The write fails so I output the file path anyway. is it because iphones can’t handle files of type .dat?

2011-03-31 09:48:50.954 AnimeSTL[196:307] All documents (
“myEventId.plist”,
“myEvents.plist”,
“myListEvents.plist”
)
2011-03-31 09:48:50.960 AnimeSTL[196:307] write failed
2011-03-31 09:48:50.962 AnimeSTL[196:307] /var/mobile/Applications/FCB4AA53-5450-495B-A190-930535335301/Documents/xml.dat

Answer 1

Remember that the iOS file system is case sensitive, whereas the Mac OS X file system usually isn’t. So if your file is really called “XML.plist” instead of “xml.plist”, that’ll work on the simulator but not on the device.