杰理之TCP客户端创建步骤【篇】

1.创建socket

void *fd = NULL;
fd = sock_reg(AF_INET, SOCK_STREAM, 0, NULL, NULL);
if(NULL == fd)
{
printf(“sock_reg fail\n”);
}
2.设置socket属性（可选）

//如：
unsigned int opt = 1;
if(sock_setsockopt(fd, IPPROTO_TCP, TCP_QUICKACK, &opt, sizeof(opt)) < 0)
{
printf(“sock_setsockopt fail\n”);
}
3.绑定IP地址、端口号等信息（可选）

struct sockaddr_in local_addr;

local_addr.sin_family = AF_INET;
local_addr.sin_addr.s_addr = htonl(INADDR_ANY)
local_addr.sin_port = htons(32768);

if (sock_bind(fd, (struct sockaddr *)&local_addr), sizeof(local_addr))
{
printf(“sock_bind fail\n”);
}
4.设置连接方IP和端口号, 并连接。

struct sockaddr_in dest_addr;

dest_addr.sin_family = AF_INET;
dest_addr.sin_addr.s_addr = inet_addr(“192.168.1.1”)
dest_addr.sin_port = htons(32769);

if(sock_connect(fd, (struct sockaddr *)&dest_addr, sizeof(struct sockaddr_in)))
{
printf(“sock_connect fail\n”);
}
5.接收数据

char buf[1024] = {0};
int recv_len = sock_recvfrom(fd, buf, sizeof(buf), 0, NULL, NULL);
if(recv_len > 0)
{
printf(“received %d Bytes, data : %s\n”, recv_len, buf);
}
6.发送数据

char *send_buf = “123456”;
int send_len = sock_send(fd, send_buf, strlen(send_buf), 0);
7.关闭socket

if(fd)
{
sock_unreg(fd);
fd = NULL;
}