python获取window下网卡流量的函数
目前只是获取window下网卡的流量信息，算是一个下载应用中的个性化插件效果体验。又需要的可以自己改进。1
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# coding:utf-8
__author__ = 'chenhuachao'
# --------------------------------
# Created by chenhuachaoon 2015/12/23.
# ---------------------------------
import wmi
import time
import platform
def get_network_flow(os):
'''监控window平台下网卡的实时的流量信息
通过当前总流量和一秒后的总流量的差值，来统计实时的网卡流量信息;
返回的流量单位是KB
'''
if os == "Windows":
c = wmi.WMI()
for interfacePerTcp in c.Win32_PerfRawData_Tcpip_TCPv4():
sentflow = float(interfacePerTcp.SegmentsSentPersec)#已发送的流量
receivedflow = float(interfacePerTcp.SegmentsReceivedPersec) #接收的流量
present_flow = sentflow+receivedflow #算出当前的总流量
time.sleep(1)
for interfacePerTcp in c.Win32_PerfRawData_Tcpip_TCPv4():
sentflow = float(interfacePerTcp.SegmentsSentPersec)#已发送的流量
receivedflow = float(interfacePerTcp.SegmentsReceivedPersec) #接收的流量
per_last_present_flow = sentflow+receivedflow #算出1秒后当前的总流量
present_network_flow = (per_last_present_flow - present_flow)/1024
print "当前流量为：{0}KB".format("%.2f"%present_network_flow)
return "%.2f"%present_network_flow
if __name__ =="__main__":
os = platform.system()
while 1:
flow = get_network_flow(os)
print "{0}KB".format(flow)
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