在两台iOS设备之间通过bonjourstream式传输图像

我的目标是通过bonjour将AVCpatureInput捕获的图像从一台iOS设备stream式传输到另一台iOS设备。

这是我目前的方法：

1）从videoinput捕捉帧

- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection { /*code to convert sampleBuffer into UIImage */ NSData * imageData = UIImageJPEGRepresentation(image,1.0); [connection sendImage:image]; } 

2）通过TCP连接发送（来自http://mobileorchard.com/tutorial-networking-and-bonjour-on-iphone/ ）

 // Send raw image over network - (void)sendRawImagePacket:(UIImage *)image { // Encode packet NSData * imageData = UIImageJPEGRepresentation(image, 1.0); NSData * rawPacket = [NSKeyedArchiver archivedDataWithRootObject:imageData]; // Write header: length of raw packet int packetLength = [rawPacket length]; [outgoingDataBuffer appendBytes:&packetLength length:sizeof(int)]; [outgoingDataBuffer appendData:rawPacket]; // Try to write to stream [self writeOutgoingBufferToStream]; } 

3）读取数据并将其转换回要显示在接收设备的UIImageView上的图像

 // Read as many bytes from the stream as possible and try to extract meaningful packets - (void)readFromStreamIntoIncomingBuffer { // Temporary buffer to read data into UInt8 buf[1024]; // Try reading while there is data while( CFReadStreamHasBytesAvailable(readStream) ) { CFIndex len = CFReadStreamRead(readStream, buf, sizeof(buf)); if ( len <= 0 ) { // Either stream was closed or error occurred. Close everything up and treat this as "connection terminated" [self close]; [delegate connectionTerminated:self]; return; } [incomingDataBuffer appendBytes:buf length:len]; } // Try to extract packets from the buffer. // // Protocol: header + body // header: an integer that indicates length of the body // body: bytes that represent encoded NSDictionary // We might have more than one message in the buffer - that's why we'll be reading it inside the while loop while( YES ) { // Did we read the header yet? if ( packetBodySize == -1 ) { // Do we have enough bytes in the buffer to read the header? if ( [incomingDataBuffer length] >= sizeof(int) ) { // extract length memcpy(&packetBodySize, [incomingDataBuffer bytes], sizeof(int)); // remove that chunk from buffer NSRange rangeToDelete = {0, sizeof(int)}; [incomingDataBuffer replaceBytesInRange:rangeToDelete withBytes:NULL length:0]; } else { // We don't have enough yet. Will wait for more data. break; } } // We should now have the header. Time to extract the body. if ( [incomingDataBuffer length] >= packetBodySize ) { // We now have enough data to extract a meaningful packet. NSData* raw = [NSData dataWithBytes:[incomingDataBuffer bytes] length:packetBodySize]; // Tell our delegate about it NSData * imageData = [NSKeyedUnarchiver unarchiveObjectWithData:raw]; UIImage * image = [UIImage imageWithData:imageData]; [delegate receivedNetworkRawImage:image viaConnection:self]; // Remove that chunk from buffer NSRange rangeToDelete = {0, packetBodySize}; [incomingDataBuffer replaceBytesInRange:rangeToDelete withBytes:NULL length:0]; // We have processed the packet. Resetting the state. packetBodySize = -1; } else { // Not enough data yet. Will wait. break; } } } 

但是，当连接断断续续时，UIImage会抛出无法呈现JPEG的错误。

我应该如何通过WiFi传递图像？

没关系，如果有些帧跳过，我需要一种方法来告诉UIImage跳过这个“批量”坏数据。

谢谢！

Answer 1

UIImage不符合NSCoding – > NSKeyedArchiver失败。

你将不得不使用UIImagePNGRepresentation（）来获取图像的数据。 或者使用UIImageJPEGRepresentation（）来压缩数据。