blocks|key|325460|text|AF_INET的主要目的是允许其他可能的网络协议或地址族(AF用于地址族；PF_INET用于(IPv4)互联网协议族)。例如，可能还存在一些Netware+SPX/IPX网络；还有其他网络系统，如DECNet、StarLAN和SNA，更不用说不成熟的ISO+(开放式系统互连)，这些系统不一定使用现在无处不在的IP地址来识别网络连接中的对等主机。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|325461|AF_INET+(回想起来，应该命名为AF_INET4)的普遍替代品是AF_INET6，用于IPv6地址族。IPv4使用32位地址；IPv6使用128位地址。|325462|您可能会看到一些其他值-但它们是不寻常的。它的存在是为了考虑其他选择和未来的发展方向。套接字接口实际上是非常通用的--这也是它在其他网络接口衰落的情况下蓬勃发展的原因之一。|325463|生活(大部分)变得更简单了--心存感激。|325464|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

The primary purpose of AF_INET was to allow for other possible network protocols or address families (AF is for address family; PF_INET is for the (IPv4) internet protocol family). For example, there probably are a few Netware SPX/IPX networks around still; there were other network systems like DECNet, StarLAN and SNA, not to mention the ill-begotten ISO OSI (Open Systems Interconnection), and these did not necessarily use the now ubiquitous IP address to identify the peer host in network connections.

The ubiquitous alternative to AF_INET (which, in retrospect, should have been named AF_INET4) is AF_INET6, for the IPv6 address family. IPv4 uses 32-bit addresses; IPv6 uses 128-bit addresses.

You may see some other values - but they are unusual. It is there to allow for alternatives and future directions. The sockets interface is actually very general indeed - which is one of the reasons it has thrived where other networking interfaces have withered.

Life has (mostly) gotten simpler - be grateful.

blocks|key|3296541|text|AF_INET是一个af，用于指定您的套接字可以与之通信的地址类型(在本例中为互联网协议v4地址)。创建套接字时，必须指定其地址族，然后只能将该类型的地址与套接字一起使用。例如，Linux内核支持其他29个地址族，如UNIX+(AF_UNIX)套接字和IPX+(AF_IPX)，还支持IRDA和蓝牙(AF_IRDA和AF_BLUETOOTH，但怀疑您是否会在如此低的级别上使用它们)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|BOLD|entityRanges|data|3296542|在大多数情况下，坚持使用AF_INET进行网络上的套接字编程是最安全的选择。还有用于互联网协议v6地址的AF_INET6。|3296543|希望这能帮上忙|3296544|entityMap^0|0|7|36|7|3N|6|46|7|4E|C|A|2|0|C|7|1G|8|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]|$9|R|A|S|B|C]|$9|T|A|U|B|C]|$9|V|A|W|B|C]|$9|X|A|Y|B|D]]|E|@]|F|$]]|$1|G|3|H|5|6|7|Z|8|@$9|10|A|11|B|C]|$9|12|A|13|B|C]]|E|@]|F|$]]|$1|I|3|J|5|6|7|14|8|@]|E|@]|F|$]]|$1|K|3|-4|5|6|7|15|8|@]|E|@]|F|$]]]|L|$]]

<code>AF_INET</code> is an address family that is used to designate the type of addresses that your socket can communicate with (in this case, Internet Protocol v4 addresses). When you create a socket, you have to specify its address family, and then you can only use addresses of that type with the socket. The Linux kernel, for example, supports 29 other address families such as UNIX (<code>AF_UNIX</code>) sockets and IPX (<code>AF_IPX</code>), and also communications with IRDA and Bluetooth (<code>AF_IRDA</code> and <code>AF_BLUETOOTH</code>, but it is doubtful you'll use these at such a low level).
For the most part, sticking with <code>AF_INET</code> for socket programming over a network is the safest option. There is also <code>AF_INET6</code> for Internet Protocol v6 addresses.
Hope this helps,

blocks|key|328101|text|套接字特征在于它们的域、类型和传输协议。常见的域有：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|328102|主机和端口号:地址格式为UNIX+pathname|328103|AF_INET:地址格式为|unordered-list-item|328104|AF_UNIX|ordered-list-item|328105|328106|328107|(实际上还有许多其他选项可用于特殊目的).usually我们使用AF_INET进行套接字编程|328108|参考：http://www.cs.uic.edu/~troy/fall99/eecs471/sockets.html|offset|length|328109|entityMap|0|LINK|mutability|MUTABLE|url|http://www.cs.uic.edu/~troy/fall99/eecs471/sockets.html^0|0|0|0|0|0|0|0|3|1J|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|10|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|11|8|@]|9|@]|A|$]]|$1|G|3|H|5|I|7|12|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|13|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|14|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|15|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|16|8|@]|9|@$P|17|Q|18|1|19]]|A|$]]|$1|R|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|S|$T|$5|U|V|W|A|$X|Y]]]]

Socket are characterized by their domain, type and transport protocol. Common domains are:

<ol>
<li>AF_UNIX: address format is UNIX pathname</li>
<li>AF_INET: address format is host and port number</li>
</ol>

(there are actually many other options which can be used here for specialized purposes).usually we use AF_INET for socket programming

Reference: <a href="http://www.cs.uic.edu/~troy/fall99/eecs471/sockets.html" rel="noreferrer">http://www.cs.uic.edu/~troy/fall99/eecs471/sockets.html</a>

blocks|key|3296656|text|您需要像AF_UNIX或AF_INET这样的参数来指定您将使用哪种类型的套接字寻址来实现IPC套接字通信。AF是Address+Family的缩写。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3296657|与BSD标准套接字(在Python套接字模块中采用)一样，地址表示如下：|3296658|3296659|单个字符串用于AF_UNIX/AF_LOCAL地址族。此选项用于不需要IP地址的本地计算机上的IPC。|ordered-list-item|3296660|A对(主机、端口)用于AF_INET地址族，其中主机是一个字符串，表示Internet域表示法中的主机名(如“”daring.cwi.nl“”)或IPv4地址(如“”100.50.200.5“”)，端口是一个整数。“”用于通过互联网在进程之间进行通信。|3296661|3296662|AF_UNIX、AF_INET6、AF_NETLINK、AF_TIPC、AF_CAN、AF_BLUETOOTH、AF_PACKET、AF_RDS是可以替代AF_INET的其他选项。|offset|length|style|BOLD|3296663|这个thread+about+the+differences+between+AF_INET+and+PF_INET可能也很有用。|3296664|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/6729366/what-is-the-difference-between-af-inet-and-pf-inet-in-socket-programming^0|0|0|0|0|0|0|0|20|25|7|0|2|1K|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|12|8|@]|9|@]|A|$]]|$1|E|3|F|5|G|7|13|8|@]|9|@]|A|$]]|$1|H|3|I|5|G|7|14|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|15|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|16|8|@$M|17|N|18|O|P]|$M|19|N|1A|O|P]]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1B|8|@]|9|@$M|1C|N|1D|1|1E]]|A|$]]|$1|S|3|-4|5|6|7|1F|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z]]]]

You need arguments like AF_UNIX or AF_INET to specify which type of socket addressing you would be using to implement IPC socket communication. AF stands for Address Family.

As in BSD standard Socket (adopted in Python socket module) addresses are represented as follows:

<ol>
<li>A single string is used for the AF_UNIX/AF_LOCAL address family. This option is used for IPC on local machines where no IP address is required.</li>
<li>A pair (host, port) is used for the AF_INET address family, where host is a string representing either a hostname in Internet domain notation like 'daring.cwi.nl' or an IPv4 address like '100.50.200.5', and port is an integer. Used to communicate between processes over the Internet.</li>
</ol>

AF_UNIX , AF_INET6 , AF_NETLINK , AF_TIPC , AF_CAN , AF_BLUETOOTH , AF_PACKET , AF_RDS are other option which could be used instead of AF_INET.

This <a href="https://stackoverflow.com/questions/6729366/what-is-the-difference-between-af-inet-and-pf-inet-in-socket-programming">thread about the differences between AF_INET and PF_INET</a> might also be useful.

blocks|key|3296677|text|它定义了协议地址，family.this决定了创建的套接字的类型。pocket+pc支持AF_INET。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3296678|下面页面中的内容是相当不错的http://etutorials.org/Programming/Pocket%2Bpc%2Bnetwork%2Bprogramming/Chapter%2B1.%2BWinsock/Streaming%2BTCP%2BSockets/|offset|length|3296679|entityMap|0|LINK|mutability|MUTABLE|url|http://etutorials.org/Programming/Pocket%2Bpc%2Bnetwork%2Bprogramming/Chapter%2B1.%2BWinsock/Streaming%2BTCP%2BSockets/^0|0|E|2X|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

it defines the protocols address family.this determines the type of socket created.
pocket pc support AF_INET.

the content in the following page is quite decent
<a href="http://etutorials.org/Programming/Pocket+pc+network+programming/Chapter+1.+Winsock/Streaming+TCP+Sockets/" rel="nofollow">http://etutorials.org/Programming/Pocket+pc+network+programming/Chapter+1.+Winsock/Streaming+TCP+Sockets/</a>

blocks|key|3083370|text|什么是AF_INET，我为什么需要它？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3083371|这意味着使用IPv4协议。这与IPv6或一些其它协议相反。|3083372|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

&quot;What is AF_INET, and why do I need it?&quot;
It means to use IPv4 protocol. As opposed to IPv6 or some other protocol.

I'm getting started on socket programming, and I keep seeing this <code>AF_INET</code>.

Yet, I've never seen anything else used in its place. My lecturers are not that helpful and just say "You just need it".

So my questions:

<ul>
<li>What is the purpose of <code>AF_INET</code>?</li>
<li>Is anything else ever used instead of it?

<ul>
<li>If not, why is it there? For possible changes in the future?</li>
<li>If so, what and why?</li>
</ul></li>
</ul>

What is AF_INET, and why do I need it?

Python

Linux

我刚开始学习套接字编程，并且一直看到这个AF_INET。然而，我从来没有见过用其他东西来代替它。我的讲师并不是很有帮助，他们只是说“你就是需要它”。所以我的问题是：AF_INETIs的用途是什么？如果没有，为什么会在那里？将来可能发生的变化?如果有，why?是什么？​

问什么是AF_INET，我为什么需要它？
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