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socket 函数
建议一个套接字。
函数原型：
SOCKET socket (
int af,int type,int protocol );
参数
af
类型：int
标识的网络地址协议族。一般为AF_INET，为IPv4地址簇。AF_INET6为IPv6地址族。
type
类型：int
被创建的套接字类型
| 宏名 | 宏值 | 意义 |
|---|---|---|
| SOCK_STREAM | 1 | 用于AF_INET或AF_INET6的TCP协议 |
| SOCK_DGRAM | 2 | 用于AF_INET或AF_INET6的UDP协议 |
| SOCK_RAW | 3 | 原始套接字 |
| SOCK_RDM | 4 | 可信赖的数据报套接字类型，这种类型一个类型的协议是PGM多播协议 |
| SOCK_SEQPACKET | 5 | 少用，可转到 官网 查看英文原版 |
protocol
类型：int
使用的协议
| 宏名 | 宏值 | 意义 |
|---|---|---|
| IPPROTO_ICMP | 1 | Internet Control Message Protocol(ICMP)协议 |
| IPPROTO_IGMP | 2 | Internet Group Management Protocol (IGMP)协议 |
| BTHPROTO_RFCOMM | 3 | Bluetooth Radio Frequency Communications (Bluetooth RFCOMM)协议 |
| IPPROTO_TCP | 6 | Transmission Control Protocol (TCP)传输控制协议 |
| IPPROTO_UDP | 17 | User Datagram Protocol (UDP)用户数据报协议 |
| IPPROTO_ICMPV6 | 58 | Internet Control Message Protocol Version 6 (ICMPv6)协议 |
| IPPROTO_RM | 113 | 用于多播的 PGM 协议 |
返回值
类型：SOCKET
成功，返回一个套接字描述符。
失败，返回 INVALID_SOCKET 。
失败，返回 INVALID_SOCKET 。
备注
支持
| 最低桌面系统支持 | Windows Vista |
| 头文件 | Winsock2.h |
| 库 | Ws2_32.lib |
| DLL | Ws2_32.dll |
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