Socket编程简单实例,TCP链接,服务器返回客户端发送内容!
客户端代码:tcpclient.cpp
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define trace printf
#define MAX_BUFFER_SIZE 128
int main(int argc, char* argv[])
{
int port = 0;
if(argc != 4)
{
trace("params error !\n");
trace("example:10.12.2.250 8000 hello\n");
return 0;
}
for(int ii = 0; ii < argc; ii++)
{
trace("***param %d: %s\n", ii + 1, argv[ii]);
}
port = atoi(argv[2]);
int sock = -1, ret = -1, recv_len = 0;
struct sockaddr_in server;
memset(&server, 0, sizeof(server));
server.sin_family = AF_INET;
server.sin_port = htons(port);
server.sin_addr.s_addr = inet_addr(argv[1]);
if((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
{
trace("create socket error !\n");
return 0;
}
if(connect(sock, (struct sockaddr*)&server, sizeof(server)) < 0)
{
trace("connect server error !\n");
close(sock);
return 0;
}
trace("connect server success !\n");
char buffer[MAX_BUFFER_SIZE] = {0};
strncpy(buffer, argv[3], sizeof(buffer) - 1);
if((send(sock, buffer, strlen(buffer) + 1, 0)) == -1)
{
trace("send buffer error !\n");
close(sock);
return 0;
}
trace("send buffer success !\n");
memset(buffer, 0, sizeof(buffer));
if((recv_len = recv(sock, buffer, sizeof(buffer), 0)) != -1)
{
trace("recv buffer success len = %d!\n", recv_len);
trace("server respond:%s\n", buffer);
}
else
{
trace("recv buffer error !\n");
}
trace("close sock success !\n");
close(sock);
return 0;
}
服务器代码:tcpserver.cpp
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define trace printf
#define MAX_BUFFER_SIZE 128
int main(int argc, char* argv[])
{
int port = 0;
if(argc != 2)
{
trace("params error , need assign port!\n");
return 0;
}
port = atoi(argv[1]);
int sock = -1, sock_connect = -1;
struct sockaddr_in server;
memset(&server, 0, sizeof(server));
server.sin_family = AF_INET;
server.sin_port = htons(port);
server.sin_addr.s_addr = htonl(INADDR_ANY);
if((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
{
trace("create socket error !\n");
return 0;
}
if(bind(sock, (struct sockaddr*)&server, sizeof(server)) < 0)
{
trace("socket bind error !\n");
close(sock);
return -1;
}
if(listen(sock, 10) != 0)
{
trace("socket listen error !\n");
close(sock);
return -1;
}
trace("socket wait connect......\n");
int recv_len = 0;
char buffer[MAX_BUFFER_SIZE] = {0};
while((sock_connect = accept(sock, NULL, NULL)) != -1)
{
if((recv_len = recv(sock_connect, buffer, sizeof(buffer), 0)) != -1)
{
trace("recv buffer success len = %d!\n", recv_len);
trace("recv contents:%s\n", buffer);
if((send(sock_connect, buffer, recv_len, 0)) == -1)
{
trace("send buffer error !\n");
}
}
close(sock_connect);
sock_connect = -1;
trace("\nsocket wait connect......\n");
}
return 0;
}
运行结果:
server:./tcpserver 8000
client:./tcpclient 10.12.2.250 8000 hello
***param 1: ./tcpclient
***param 2: 10.12.2.250
***param 3: 9898
***param 4: hello
connect server success !
send buffer success !
recv buffer success len = 6!
server respond:hello
close sock success !
server:
socket wait connect......
recv buffer success len = 6!
recv contents:hello