Telescope/第二周/tcpSocket/tcpSocket.c

#include"tcpSocket.h"

bool init_Socket()
{
	WSADATA wsadata;  //定义变量wsadata
	if (0 != WSAStartup(MAKEWORD(2,2),&wsadata))  //WSA:windows socket ansyc windows异步套接字;2.2版本
	 {
		 //不等于0失败
		 //printf("[error]WSAStartup failed code %d", WSAGetLastError());
		 err("WSAStartup");
		 return false;
	 }

	return true;
}

bool close_Socket()
{
	if (0 != WSACleanup())
	{
		err("WSACleanup");
		return false;
	}

	return true;
}

SOCKET create_serverSocket()
{
	//1.创建一个空socket,AF_INET代表IPV4，SOCK_STREAM流式套接字
	SOCKET fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	if (INVALID_SOCKET == fd)
	{
		err("socket");
		return INVALID_SOCKET;  //错误就返回，正确就继续
	}
	//~0（对0取反） 对于有符号来说是-1，对于无符号来说是最大值

	//2.给socket绑定本地的ip地址和端口号
	struct sockaddr_in addr;  //结构体addr
	addr.sin_family = AF_INET;  //协议族IPV4
	addr.sin_port = htons(PORT);  //本地字节序转成网络字节序,大端存储和小端存储的相互转换
	addr.sin_addr.S_un.S_addr = ADDR_ANY;  //绑定本地任意ip

	if (SOCKET_ERROR == bind(fd, (struct sockaddr*)&addr, sizeof(addr))) //(struct sockaddr*)强制转换
	{
		err("bind");
		return INVALID_SOCKET;
	}
	//3.开始监听
	listen(fd, 10);

	return fd;
}

SOCKET create_clientSocket(const char * ip)
{
	//1.创建一个空socket,AF_INET代表IPV4，SOCK_STREAM流式套接字
	SOCKET fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	if (INVALID_SOCKET == fd)
	{
		err("socket");
		return INVALID_SOCKET;  //错误就返回，正确就继续
	}
	//~0（对0取反） 对于有符号来说是-1，对于无符号来说是最大值

	//2.给socket绑定服务端的ip地址和端口号
	struct sockaddr_in addr;  //结构体addr
	addr.sin_family = AF_INET;  //协议族IPV4
	addr.sin_port = htons(PORT);  //本地字节序转成网络字节序,大端存储和小端存储的相互转换
	addr.sin_addr.S_un.S_addr = inet_addr(ip);  //绑定服务器ip，ip转换格式

	//
	if (INVALID_SOCKET == connect(fd, &addr, sizeof(addr)))
	{
		err("connect");
		return INVALID_SOCKET;
	}



	return fd;
}