python 服务端读取字符流和字节流(udp)

pyhon udp服务器读取字符流

程序如下：

from socket import *
import time
import os

host = ''
port =8899
bufsize = 1024
addr = (host,port)

def recv():
	recvdata = socket(AF_INET,SOCK_DGRAM)
	recvdata.bind(addr)
	print("waiting for connection")
	print("开始时间为:",time.strftime('%Y-%m-%d %H:%M:%S'))
	f = open('8899UDP.txt','w',encoding = 'UTF-8')
	while True:
		data = recvdata.recvfrom(bufsize)
		print(data,end = ' ')
		print("timestamp:",time.strftime('%Y-%m-%d %H:%M:%S'))
		data = str(data)
		now = str(time.strftime('%Y-%m-%d %H:%M:%S'))
		f.write(data)
		f.write(now)
		f.write("\n")


if __name__ == '__main__':
	recv()

客户端采用sprintf（）进行数据的封装，

举例：  

char senddata[60];

sprintf(senddata,"%dBB,%d,%f,%f,%f",id,as,a[0],a[1],a[2]);
esp8266_sendstring(senddata,strlen(senddata));

pyhon udp服务器读取字节流

程序如下：

还未编写。。。。

客户端采用结构体进行数据的封装（注意:字节对齐）

举例：

typedef struct SendData
{
    unsigned int id;
    unsigned short as;
    char a[3];
}SendData;

SendData goingto;
char godata[8];

goingto.id=12;
goingto.as=72;
goingto.a[0]=0.123124;
goingto.a[1]=-1.232122;
goingto.a[2]=-2.321421;

memset(godata,(char *)&goingto,sizeof(goingto));
esp9266_sendstring(godata,sizeof(godata));
memset(&goingto,0,sizeof(godata));