Question

现在我正在为Skypatrol TT8750 +的消息开发一种解析器，我的线程TCP服务器正在运行。问题是如果同时连接许多设备，这不是一个好方法。我正在使用碘但是我无法为我提供一些代码。我的目标是首先接收一条33字节的消息来识别设备，然后开始接收包含车辆信息的86字节消息。

require 'iodine'

# define the protocol for our service
class TT8750plus
  @timeout = 10
  def on_open
    puts "New Connection Accepted."
    # this file is just for testing purposes.
    t = Time.now.strftime("%d-%m-%Y %H%M")
    file_name = t + '.txt'
    @out_file = File.new(file_name, "w+")

    # a rolling buffer for fragmented messages
    @expecting = 33
    @msg = ""
  end

  def on_message buffer
    length = buffer.length
    pos = 0
    while length >= @expecting
      @msg << (buffer[pos, @expecting])
      @out_file.puts(@msg.unpack('H*')[0])
      length -= @expecting
      po += @expecting
      @expecting = 86
      @msg.clear
    end
    if(length > 0)
      @msg << (buffer[pos, length])
      @expecting = 86 - length
    end
    puts @msg
  end

  def on_close
    @out_file.close
  end
end
# create the service instance
Iodine.listen 12050, TT8750plus
# start the service
Iodine.start

每条消息都会显示此错误

New Connection Accepted.
Iodine caught an unprotected exception - NoMethodError: undefined method `+' for nil:NilClass
iodineServer.rb:26:in `on_message'
iodineServer.rb:1:in `on_data'Iodine caught an unprotected exception - NoMethodError: undefined method `+' for nil:NilClass

此实现也无法获取我需要的消息这是我从这个实现中得到的前两行：

0021000a0800000000000120202020202038363332383630323034333433373020
0021000a08000000000001202020202020383633323836303230343334333730200056000a08100020202020202038363332383630323034333433373020014b0000

这些是线程实现的前两行

0021000a0800000000000120202020202038363332383630323034333433373020
0056000a08100020202020202038363332383630323034333433373020000b00000013090044709bfb8109e400000000001100000000000067eb11090c1512012e970020000000000005000000000005000000000007 
0056000a08100020202020202038363332383630323034333433373020010b00000013090044709bfb8109e400000000001200000000000067eb11090c1512042e970020000000000005000000000005000000000008

Answer 1

这看起来像我之前发布的未经测试的代码的变体。

似乎问题是代码中的拼写错误（可能是我的？）。

po += ...应该是pos += ...

require 'iodine'

# define the protocol for our service
class TT8750plus
  @timeout = 10
  def on_open
    puts "New Connection Accepted."
    # this file is just for testing purposes.
    t = Time.now.strftime("%d-%m-%Y %H%M")
    file_name = t + '.txt'
    @out_file = File.new(file_name, "w+")

    # a rolling buffer for fragmented messages
    @expecting = 33
    @msg = ""
  end

  def on_message buffer
    length = buffer.length
    pos = 0
    while length >= @expecting
      @msg << (buffer[pos, @expecting])
      @out_file.puts(@msg.unpack('H*')[0])
      length -= @expecting
      pos += @expecting # the spelling mistake was here
      @expecting = 86
      puts "wrote:", @msg
      @msg.clear
    end
    if(length > 0)
      @msg << (buffer[pos, length])
      @expecting = 86 - length
    end
    puts("Waiting for more data:", @msg) unless @msg.empty?
  end

  def on_close
    @out_file.close
  end
end
# create the service instance
Iodine.listen 12050, TT8750plus
# start the service
Iodine.start

同样，由于缺乏对Skypatrol TT8750 +的仿真，我无法测试代码。但是应该可以按照错误消息慢慢追踪这些类型的问题。

<强> P.S。

为了防止异常，请考虑使用Ruby：

begin
    # code
rescue => e
    # oops something happened. i.e.
    puts e.message, e.backtrace
end

即，on_message方法可能如下所示：

  def on_message buffer
   begin
    length = buffer.length
    pos = 0
    while length >= @expecting
      @msg << (buffer[pos, @expecting])
      @out_file.puts(@msg.unpack('H*')[0])
      length -= @expecting
      pos += @expecting # the spelling mistake was here
      @expecting = 86
      @msg.clear
    end
    if(length > 0)
      @msg << (buffer[pos, length])
      @expecting = 86 - length
    end
    puts @msg unless @msg.empty? # print leftovers for testing...?
   rescue => e
     # oops something happened. React
     puts e.message, e.backtrace
   end
  end

此外，FYI，碘允许您控制您使用的进程（工作者）和线程的数量。有关详细信息，请参阅the documentation。

用碘处理AVL消息

1 个答案: