Python 3.5.2实现websocket服务端（三）： sendMessage函数实现

# 调用socket的send方法发送str信息给web端
def sendMessage(msg):
    global connectionlist
    send_msg = b""  #使用bytes格式,避免后面拼接的时候出现异常
    send_msg += b"\x81"
    back_str = []
    back_str.append('\x81')
    data_length = len(msg.encode()) 
    if data_length <= 125:
        send_msg += str.encode(chr(data_length))
    elif data_length <= 65535:
        send_msg += struct.pack('b', 126)
        send_msg += struct.pack('>h', data_length)
    elif data_length <= (2^64-1):
        send_msg += struct.pack('b', 127)
        send_msg += struct.pack('>q', data_length)
    else:
        print (u'太长了')
    for connection in connectionlist.values():
        if send_message != None and len(send_message) > 0:
            connection.send(send_message)

说明

data_length = len(msg.encode())

着重注意以上代码，因为msg为字符串，考虑到字符串中可能存在中文，所以需要转为bytes信息后再计算长度。