iOS 传文字 图片给java服务器遇到这种错误？？？

Question

我写的代码

             //图片名
             NSData *nameDate = [@"61DD9人像__昵称__图片名21212122121.jpg\r\n" dataUsingEncoding:kCFStringEncodingUTF8];
            [asyncsocket writeData:nameDate withTimeout:-1 tag:0];
            
            //图片长度
            uint64_t length =(uint64_t) imageData.length;
            length = CFSwapInt64HostToBig(length);
            NSData *lengthdata = [NSData dataWithBytes:&length length:8];
            [asyncsocket writeData:lengthdata withTimeout:-1 tag:0];
             //图片
            [asyncsocket writeData:imageData withTimeout:-1 tag:0];