Question

I try to use codes

-(bool)checIfWorksOnJailbreak;
{

    NSString *s = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Info.plist"];

    NSLog(@"%@",s);

    if([[NSFileManager defaultManager] fileExistsAtPath:s]) {


        NSDictionary *plistDictionary =  (NSDictionary*)[NSKeyedUnarchiver unarchiveObjectWithFile:s];


        NSString *valueString = [plistDictionary objectForKey:@"SigerIdentity"];
        if([valueString isEqualToString:@"Apple OS Application Signing"])
            return true;
        else
            return false; 
    }

    return false;

}

it always cause error

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', 
reason: '*** -[NSKeyedUnarchiver initForReadingWithData:]: 
incomprehensible archive version (-1)'

at line

NSDictionary *plistDictionary =  (NSDictionary*)[NSKeyedUnarchiver unarchiveObjectWithFile:s];

Welcome any comment

Answer 1

NSKeyedUnarchiver (and NSKeyedArchiver) are not for encoding and decoding plists. Instead, they are used to serialize and deserialize objects that implement the NSCoding protocol. To read your plist data into a dictionary, you instead should use:

NSDictionary *plistDictionary = [NSDictionary dictionaryWithContentsOfFile:s];