NSJSONSerialization writeJSONObject example ios

writeJSONObject: toStream: options: error:

Writes a given JSON object to a stream.

+ (NSInteger)writeJSONObject:(id)obj toStream:(NSOutputStream *)stream options:(NSJSONWritingOptions)opt error:(NSError **)error

Parameters

obj

The object to write to stream.

stream

The stream to which to write.

The stream should be opened and configured.( NSJSONSerialization writeJSONObject example )

opt

Options for writing the JSON data.

See “NSJSONWritingOptions” for possible values. Pass 0 to specify no options.

error

If an error occurs, upon return contains an NSError object that describes the problem.

Return Value

The number of bytes written to the stream, or 0 if an error occurs.

( NSJSONSerialization writeJSONObject example )

NSString *fileName = @"myJsonDict.dat"; // probably somewhere in 'Documents'
NSDictionary *dict = @{ @"key" : @"value" };

NSOutputStream *os = [[NSOutputStream alloc] initToFileAtPath:fileName append:NO];

[os open];
[NSJSONSerialization writeJSONObject:dict toStream:os options:0 error:nil];
[os close];

// reading back in...
NSInputStream *is = [[NSInputStream alloc] initWithFileAtPath:fileName];

[is open];
NSDictionary *readDict = [NSJSONSerialization JSONObjectWithStream:is options:0 error:nil];
[is close];

NSLog(@"%@", readDict);

( NSJSONSerialization writeJSONObject example )

NSError *error = nil;
NSOutputStream *outputStream = [NSOutputStream outputStreamToFileAtPath:filepath append:yesOrNo];
[outputStream open];

[NSJSONSerialization writeJSONObject :nsDicOrNSArrayObject 
                            toStream:outputStream 
                             options:0 
                               error:&error];
[outputStream close];