I'am trying to send UIImages each second over NSStream
but i get a crash when decoding on
NSData * data = [NSData dataWithBytes:buffer length:len];
*Uncaught exception: *** -[NSKeyedUnarchiver initForReadingWithData:]: incomprehensible archive (0x62, 0x70, 0x6c, 0x69, 0x73, 0x74, 0x30, 0x30)*
looks like the data is corrupted / incomplete, due to bad handling
- i'am not sure if i supposed to create a new stream, each time i want to send an image
- i'am not sure about the decoding, especially about the buffer size (and how to make it work by having the size variable)
// to send an UIImage each sec
- (void)sendStreamImage:(UIImage *)image withOrientation:(UIInterfaceOrientation)orientation {
NSError * error;
NSOutputStream *outputStream = [self.session startStreamWithName:@"SnapClapStream" toPeer:[self.session.connectedPeers firstObject] error:&error];
// handle error if present
outputStream.delegate = self;
[outputStream scheduleInRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];
[outputStream open];
NSData * imageData = ...
NSDictionary * dictionary = @{@"imageData":imageData, @"orientation":@(orientation)};
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:dictionary];
[outputStream write:[data bytes] maxLength:[data length]];
}
In the stream delegate
- (void)stream:(NSStream *)aStream handleEvent:(NSStreamEvent)eventCode {
if (eventCode == NSStreamEventHasBytesAvailable) {
if (![aStream isKindOfClass:[NSInputStream class]]) {
return;
}
NSInputStream * inputStream = (NSInputStream *)aStream;
NSInteger bufferSizeNumber = (25 * 1024);
NSMutableData *myBuffer = [NSMutableData dataWithLength:bufferSizeNumber];
uint8_t *buffer = [myBuffer mutableBytes];
NSInteger len = 0;
while ([inputStream hasBytesAvailable]) {
len = [inputStream read:buffer maxLength:bufferSizeNumber];
if (len > 0) {
NSData * data = [NSData dataWithBytes:buffer length:len];
NSDictionary * dictionary = [NSKeyedUnarchiver unarchiveObjectWithData:data];
dictionary = [self processReceivedDictionary:dictionary];
// thats it, dictionary should contain all the data
}
}
} else if (eventCode == NSStreamEventEndEncountered) {
...
}
}