Error while converting NSData to NSDictionary using NSKeyedUnarchiver - iphone

Question

I want to archive and Unarchive data which contains NSDictionary object. Crash is observed while Unarchiving data. Please find the code and error below,
Archive:
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:mydictobject];
Unarchiving:
NSData *Objdata = [[NSData alloc] initWithBytes:sqlite3_column_blob(statement, 2)
length:sqlite3_column_bytes(statement, 2)];
NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc]
initForReadingWithData:Objdata];
NSDictionary *dict = [NSDictionary dictionaryWithDictionary:
[NSKeyedUnarchiver unarchiveObjectWithData:Objdata]];
[dict objectForKey:#"key1"];
Error:
* Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: ' -[NSKeyedUnarchiver initForReadingWithData:]: incomprehensible archive (0xfffffff8, 0xffffffc7, 0xf, 0x1, 0x2, 0x0, 0x0, 0x0)'
** First throw call stack:
(0x222b012 0x194e7e 0x222adeb 0xe78c90 0xe7f2 0x3c11 0x19256 0x43f8d5 0x43fb3d 0xe46e83 0x21ea376 0x21e9e06 0x21d1a82 0x21d0f44 0x21d0e1b 0x21857e3 0x2185668 0x39065c 0x2612 0x2545 0x1)
libc++abi.dylib: terminate called throwing an exception
Thanks.

Answer 1

// To read data do following
-(void) readAnimalsFromDatabase {
// Setup the database object
sqlite3 *database;
// Init the animals Array
dataArray = [[NSMutableArray alloc] init];
// Open the database from the users filessytem
if(sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK) {
// Setup the SQL Statement and compile it for faster access
const char *sqlStatement = "select * from anyTable";
sqlite3_stmt *compiledStatement;
if(sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL) == SQLITE_OK) {
// Loop through the results and add them to the feeds array
while(sqlite3_step(compiledStatement) == SQLITE_ROW) {
// Read the data from the result row
NSString *aName = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 1)];
NSString *aDescription = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 2)];
NSString *aImageUrl = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 3)];
NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:aName, #"name", aDescription, #"description", aImageUrl, #"imageURL", nil];
// Add the animal object to the animals Array
[dataArray addObject:dict];
}
}
// Release the compiled statement from memory
sqlite3_finalize(compiledStatement);
}
sqlite3_close(database);
// Archive NSArray to NSData
NSData *archiveData = [NSKeyedArchiver archivedDataWithRootObject:dataArray];
// UnArchive NSData to NSDictionary
NSArray *array = [NSArray arrayWithArray:[NSKeyedUnarchiver unarchiveObjectWithData:data]];
NSLog(#"%#",array);
}