C语言Socket编程(TCP与UDP)
UDP:
#include
#include
#include
#include
#include
#include
#define PORT_SERV 8889
#define BUFF_LEN 1024static
void UDP_server_process(int s,struct sockaddr_in *client)
{
int n,len,PORT_INT,count = 0;
char buff[BUFF_LEN] = {0};
char *IP_STR;
len = sizeof(*client);
while(1){
n = recvfrom(s,buff,BUFF_LEN,0,(struct sockaddr *)client,&len);
IP_STR = (char *)inet_ntoa(client->sin_addr);
PORT_INT = ntohs(client->sin_port);
printf("%d Received Address:%s:%d\n",count,IP_STR,PORT_INT);
printf("%d Received Message:%s\n",count++,buff);
printf("\n");
sendto(s,buff,n,0,(struct sockaddr *)client,len);
memset(buff,0,BUFF_LEN);
}
}
int main(int argc,char **argv)
{
int s;
struct sockaddr_in addr_serv,addr_clie;
s = socket(AF_INET,SOCK_DGRAM,0);
memset(&addr_serv,0,sizeof(addr_serv));
addr_serv.sin_family = AF_INET;
addr_serv.sin_addr.s_addr = htonl(INADDR_ANY);
addr_serv.sin_port = htons(PORT_SERV);
bind(s,(struct sockaddr *)&addr_serv,sizeof(addr_serv));
UDP_server_process(s,&addr_clie);
return 0;
}
#include
#include
#include
#include
#include
#include
#define PORT_SERV 8889
#define BUFF_LEN 1024
#define SERV_IP "192.168.31.34"
static void UDP_client_process(int s,struct sockaddr_in *client)
{
char RecBuff[BUFF_LEN]="\n";
char SendBuff[BUFF_LEN] = {0};
int n;
struct sockaddr_in from;
int len = sizeof(*client);
printf("please input message!\n");
while(1){
n = read(0,SendBuff,BUFF_LEN);
SendBuff[n++] = '\0';
sendto(s,SendBuff,n,0,(struct sockaddr *)client,len);
}
}
int main(int argc,char **argv)
{
int s;
struct sockaddr_in addr_serv,addr_clie;
char *msg;
s = socket(AF_INET,SOCK_DGRAM,0);
memset(&addr_clie,0,sizeof(addr_clie));
addr_clie.sin_family = AF_INET;
addr_clie.sin_addr.s_addr = htonl(INADDR_ANY);
addr_clie.sin_port = htons(PORT_SERV);
UDP_client_process(s,&addr_clie);
close(s);
return 0;
}

TCP
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#define SERVER_PORT 6666
int main()
{
int sock;
struct sockaddr_in server_addr;
struct sockaddr_in client_addr;
int addr_len = sizeof(server_addr);
int client;
char buffer[1024];
int DataNum;
if((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
{
perror("socket");
return 1;
}
bzero(&server_addr, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(SERVER_PORT);
server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
if(bind(sock, (struct sockaddr *)&server_addr, addr_len) < 0)
{
perror("connect");
return 1;
}
if(listen(sock, 5) < 0)
{
perror("listen");
return 1;
}
while(1)
{
printf("监听端口: %d\n", SERVER_PORT);
client = accept(sock, (struct sockaddr*)&client_addr, (socklen_t*)&addr_len);
if(client < 0)
{
perror("accept");
continue;
}
printf("等待消息...\n");
printf("IP is %s\n", inet_ntoa(client_addr.sin_addr));
printf("Port is %d\n", htons(client_addr.sin_port));
int n = 0;
while(1)
{
DataNum = recv(client, buffer, 1024, 0);
if(DataNum < 0)
{
perror("recv null");
continue;
}
if(strcmp(buffer, "quit") == 0)
break;
printf("读取消息:%s\n",buffer);
memset(buffer,0,sizeof(buffer));
printf("发送消息:");
fflush( stdout );
n = read(0,buffer,1024);
send(client, buffer, n, 0);
printf("\n");
if(strcmp(buffer, "quit") == 0)
break;
}
}
close(sock);
return 0;
}
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#define SERVER_PORT 6666
int main()
{
int sock;
struct sockaddr_in server_addr;
char buffer[1024];
int DataNum;
if((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
{
perror("socket");
return 1;
}
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(SERVER_PORT);
server_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
if(connect(sock, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0)
{
perror("connect");
return 1;
}
int n = 0;
while(1)
{
printf("发送消息:");
fflush( stdout );
n = read(0,buffer,1024);
buffer[n++] = '\0';
printf("\n");
send(sock, buffer, n, 0);
if(strcmp(buffer, "quit") == 0)
break;
memset(buffer,0,sizeof(buffer));
DataNum = recv(sock, buffer, 1024, 0);
printf("接收消息:%s\n", buffer);
memset(buffer,0,sizeof(buffer));
}
close(sock);
return 0;
}
