代码之家 › 专栏 › 技术社区 › JacobIRR

在套接字连接上发送浮点数组

sockets python-3.x python

JacobIRR · 技术社区 · 6 年前

我正在测试一个简单的客户机/服务器套接字设置。从client=>服务器发送字符串值很容易使用:

bytes(my_string, "UTF-8")

但是,现在我正尝试发送一个数字数组(一些浮点数),我得到这个错误:

Traceback (most recent call last):
  File "client.py", line 26, in <module>
    main2()
  File "client.py", line 22, in main2
    s.send(bytes(sample))
TypeError: 'float' object cannot be interpreted as an integer

假设我必须发送字节,那么最好的方法是什么将浮点转换为字节,然后在接收到浮点之后再转换回浮点?

客户代码如下:

def main2():
    import socket

    s = socket.socket()
    host = socket.gethostname()  # client and server are on same network
    port = 1247
    s.connect((host, port))
    print(s.recv(1024))
    sample = [0.9,120000,0.85,12.8,0.1,28,16,124565,0.72,3.9]
    s.send(bytes(sample))
    print("the message has been sent")

if __name__ == '__main__':
    main2()

以及服务器代码,如果它很重要:

def main2():
    import socket

    s = socket.socket()
    host = socket.gethostname()
    port = 1247
    s.bind((host,port))
    s.listen(5)
    while True:
        try:
            c, addr = s.accept()
            print("Connection accepted from " + repr(addr[1]))
            c.send(bytes("Server approved connection\n", "UTF-8"))
            print(repr(addr[1]) + ": " + str(c.recv(1024)))
            continue
        except (SystemExit, KeyboardInterrupt):
            print("Exiting....")
            c.close()
            break
        except Exception as ex:
            import traceback
            print("Fatal Error...." + str(ex))
            print(traceback.format_exc())
            c.close()
            break

if __name__ == '__main__':
    main2()

1 回复 | 直到 6 年前

Mark Tolonen 6 年前

struct.pack 和 struct.unpack 将各种类型的数据打包到字节流中:

>>> import struct
>>> sample = [0.9,120000,0.85,12.8,0.1,28,16,124565,0.72,3.9]
>>> data = struct.pack('<10f',*sample)
>>> print(data)
b'fff?\x00`\xeaG\x9a\x99Y?\xcd\xccLA\xcd\xcc\xcc=\x00\x00\xe0A\x00\x00\x80A\x80J\xf3G\xecQ8?\x9a\x99y@'
>>> data = struct.unpack('<10f',data)
>>> data
(0.8999999761581421, 120000.0, 0.8500000238418579, 12.800000190734863, 0.10000000149011612, 28.0, 16.0, 124565.0, 0.7200000286102295, 3.9000000953674316)

在上述代码中 <10f 意味着将十个浮点(小尾数)打包(或解包)成一个字节字符串。

另一个选项是使用JSON将列表对象序列化为字符串并将其编码为字节字符串:

>>> import json
>>> data = json.dumps(sample).encode()
>>> data # byte string
b'[0.9, 120000, 0.85, 12.8, 0.1, 28, 16, 124565, 0.72, 3.9]'
>>> json.loads(data) # back to list of floats
[0.9, 120000, 0.85, 12.8, 0.1, 28, 16, 124565, 0.72, 3.9]