输出流(在流的代表中)

...//prevIoUs code
 case NSStreamEventHasSpaceAvailable: {
            //we will only open the stream when we want to send the file.

            NSLog(@"Stream has space available");
            //[self updateStatus:@"Sending"];

            // If we don't have any data buffered,go read the next chunk of data.

            if (totalBytesWritten< outgoingDataBuffer.length) {
                //more stuff to read
                int towrite;
                int diff = outgoingDataBuffer.length-packetSize;
                if (diff <= totalBytesWritten)
                {
                    towrite = outgoingDataBuffer.length - totalBytesWritten;
                } else
                    towrite = packetSize;
                NSRange byteRange = {totalBytesWritten,towrite};
                uint8_t buffer[towrite];
                [outgoingDataBuffer getBytes:buffer range:byteRange];


                NSInteger bytesWritten = [outputStream write:buffer maxLength:towrite];
                totalBytesWritten += bytesWritten;
                NSLog(@"Written %d out of %d bytes",totalBytesWritten,outgoingDataBuffer.length);
            } else {
                //we've written all we can write about the topic?
                NSLog(@"Written %d out of %d bytes",outgoingDataBuffer.length);
                [self endStream];
            }

            // If we're not out of data completely,send the next chunk.
        } break;

输入流

- (void)stream:(NSStream *)stream handleEvent:(NSStreamEvent)eventCode {

    switch(eventCode) {
        case NSStreamEventHasBytesAvailable:
        {
            NSLog(@"Bytes Available");
            //Sent when the input stream has bytes to read,we need to read bytes or else this wont be called again
            //when this happens... we want to read as many bytes as we can

            uint8_t buffer[1024];
            int bytesRead;

            bytesRead = [inputStream read:buffer maxLength:sizeof(buffer)];
            [incomingDataBuffer appendBytes:&buffer length:bytesRead];
            totalBytesRead += bytesRead;
            NSLog(@"Read %d bytes,total read bytes: %d",bytesRead,totalBytesRead);

        }break;
        case NSStreamEventEndEncountered:
        {
            UIImage *newImage = [[UIImage alloc]initWithData:incomingDataBuffer];
            [[self.detailViewController imageView] setImage:newImage];
            NSLog(@"End Encountered");

            [self closeStream];
            //this should get called when there aren't any more bytes being sent down the stream
        }
    }
 }

有没有办法通过多线程或使用稍微修改的NSStream子类来加速此文件传输,这些子类使用异步套接字？