如何通过TCP / IP通信Java和Labview，并发送浮点数据缓冲区？

Question

I am working on a university project, where I require communicating Java with Labview, bidirectional, and send and receive data in floating point, in data buffers, because the application in Labview generates data at high speed, but I temporarily store and send when the array has a size of 100.

One of my difucultades is to convert data sent from Labview to Java format and viceversa.

Thanks!!

Answer 1

As far as I can see, you have two options:

1. Use a text base protocol (XML, JSON, something of your own) and just send the literal "1.3454".
   1. pro: it's probably human readable, which simplifies debugging/ asserting that the correct data is transferred. It is also simpler to have different types of messages.
   2. con: This may mean a loss of precision and definitely means some kind of overhead.
2. If you just have this one kind of data, you could also extract the bytes of the float and send them, so that the other end can read exactly four bytes and reconstruct the float.
   1. pro : no overhead
   2. con: There might be a problem with endianess. I'm not sure if LabVIEW and Java handle all their data in a specific endian or if it depends on the hardware. You might need to reorder the read bytes before reassembling them back to a float. Also different kinds of messages can get more complicated. On this best read the documentation on the TCP Read VI

You can also mix both approaches: extract the bytes from the float, treat each byte as a character and assemble them as a string, which you put into your text based protocol.

Answer 2

考虑使用Labview标准的tcp-ip lib或websocket。