zoukankan      html  css  js  c++  java
  • socket client简单传输数据

    1.整数转换为用于TCP传输的二进制
    	_host = "127.0.0.1"
            _port = 5678
            _address = (_host, _port)
    	
            s=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
            connect_result = s.connect(self._address)
    	#二进制的字符串
            s.send(b'welcome to server!')
    	# !代表的是大字节序
    	s.send(struct.pack(">i",12345))
    		
    	#与erlang的不定长数据包,先接受报头。
    	bytes_msg_length = s.recv(2)
    		
            #解压数据,返回值为一个tuple,有效值为tuple内第一个位置。
            msg_length= struct.unpack(">h", bytes_msg_length)
    		
            bytes_msg= s.recv(msg_length[0])        
            msg= struct.unpack(">f", bytes_msg)
    	print(msg[0])
    

    数据类型的转换:

    一、整数和二进制数据之间的转换

    (1243).to_bytes(4, byteorder='big')

    出自Python3.4文档
    
    int.to_bytes(length, byteorder, *, signed=False) 
    Return an array of bytes representing an integer.
    
    >>> (1024).to_bytes(2, byteorder='big')
    b'x04x00'
    >>> (1024).to_bytes(10, byteorder='big')
    b'x00x00x00x00x00x00x00x00x04x00'
    >>> (-1024).to_bytes(10, byteorder='big', signed=True)
    b'xffxffxffxffxffxffxffxffxfcx00'
    >>> x = 1000
    >>> x.to_bytes((x.bit_length() // 8) + 1, byteorder='little')
    b'xe8x03'
    The integer is represented using length bytes. An OverflowError is raised if the integer is not representable with the given number of bytes.
    
    The byteorder argument determines the byte order used to represent the integer. If byteorder is "big", the most significant byte is at the beginning of the byte array. If byteorder is "little", the most significant byte is at the end of the byte array. To request the native byte order of the host system, use sys.byteorder as the byte order value.
    
    The signed argument determines whether two’s complement is used to represent the integer. If signed is False and a negative integer is given, an OverflowError is raised. The default value for signed is False.
    

    int.from_bytes((1243).to_bytes(4, byteorder='big'), byteorder='big')

    int.from_bytes(bytes, byteorder, *, signed=False) 
    Return the integer represented by the given array of bytes.
    
    >>> int.from_bytes(b'x00x10', byteorder='big')
    16
    >>> int.from_bytes(b'x00x10', byteorder='little')
    4096
    >>> int.from_bytes(b'xfcx00', byteorder='big', signed=True)
    -1024
    >>> int.from_bytes(b'xfcx00', byteorder='big', signed=False)
    64512
    >>> int.from_bytes([255, 0, 0], byteorder='big')
    16711680
    The argument bytes must either be a bytes-like object or an iterable producing bytes.
    
    The byteorder argument determines the byte order used to represent the integer. If byteorder is "big", the most significant byte is at the beginning of the byte array. If byteorder is "little", the most significant byte is at the end of the byte array. To request the native byte order of the host system, use sys.byteorder as the byte order value.
    
    The signed argument indicates whether two’s complement is used to represent the integer.
    

    二进制的拼接:

    aa = 123
    dd = "汉字"
    #bytesToInt是自定义的将int型转换为bytes的函数,参照上边的int.to_bytes() bb = intToBytes(aa) print("bb", bb) #二进制的拼接 cc = bb + bb+bb + bytes(dd, "utf8") print("cc", cc) print("len", len(cc)) #bytesToInt是自定义的将bytes转换为int型的函数,参照上边的int.from_bytes() print("---", bytesToInt(cc[1:4])) print("---", bytesToInt(cc[4:8])) print("---", bytesToInt(cc[8:12])) print("---", bytesToInt(cc[-10:-6])) print("---", (cc[-6:]).decode("utf8"))

    方案二:

    多个数据的合并

    import struct
    from ctypes import create_string_buffer  
    
    #------------------------------------
    #需要向一个数据包中多次压入数据
    #-------------------------------------------
    
    format_1 = ">i"
    buffer_1 = struct.pack(format_1, 20)  
    
    format_len_1 = struct.calcsize(format_1)
    print(buffer_1)
    print(format_len_1)
    
    print("___________________________________")
    
    
    buf = create_string_buffer(12)  
    print("--", repr(buf.raw)) 
    struct.pack_into(">iii", buf, 0, 1, 2, -1) 
    print("--", repr(buf.raw)) 
    print("--", buf.raw) 
    
    print(struct.unpack_from(">iii", buf, 0)  ) 
    
    #二进制的拼接
    head = create_string_buffer(16)
    body = create_string_buffer(16)
    all = create_string_buffer(32) 
    all.raw = head.raw + body.raw
    
  • 相关阅读:
    呵呵,今天偶然看到了我最早期的商业网站作品
    轻量级的Ajax解决方案——DynAjax:直接在客户端调用C#类的方法
    RegexDesigner.NET 正则表达式开源工具
    Asp.net页面的生命周期之通俗理解
    我设计的公司网站主页 截图
    没想到裴勇俊留了一头长发。
    一个very好的Javascript ajax库,jQuery!
    JQuery资源收集
    收藏:悟透JavaScript
    VS2008 F5不能调试情况一例
  • 原文地址:https://www.cnblogs.com/ribavnu/p/4720130.html
Copyright © 2011-2022 走看看