C语言中的socket编程实例代码

/* window socket 服务端编程测试 */
#include <stdio.h>     //用于printf等函数的调用
#include <winsock2.h>    //Socket的函数调用　
#pragma comment (lib, "ws2_32.lib")  //C语言引用其他类库时，除了.h文件外，还要加入对应的lib文件，如果仍提示错误则需要在IDE中手动加入该链接库

int main()
{
 WSADATA wsaData;
 WSAStartup(MAKEWORD(2, 2), &wsaData);
 SOCKET s=socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
 sockaddr_in sockaddr;
 sockaddr.sin_family=PF_INET;
 sockaddr.sin_addr.S_un.S_addr=inet_addr("127.0.0.1"); //需要绑定到本地的哪个IP地址
 sockaddr.sin_port=htons(9000);       //需要监听的端口
 bind(s, (SOCKADDR*)&sockaddr, sizeof(SOCKADDR));  //进行绑定动作
 listen(s, 1);           //启动监听
 printf("listening on port [%d].\n", 9000);
 while(TRUE)
 {
  SOCKADDR clientAddr;
  int size=sizeof(SOCKADDR);
  SOCKET clientsocket;
  clientsocket=accept(s, &clientAddr, &size);    //阻塞，直到有新tcp客户端连接
  printf("***SYS*** New client touched.\n");
  char* msg="Hello, my client.\r\n";
  send(clientsocket, msg, strlen(msg)+sizeof(char), NULL); //这里的第三个参数要注意，是加了一个char长度的
  printf("***SYS*** HELLO.\n");
  while(TRUE)
  {
   char buffer[MAXBYTE]={0};
   recv(clientsocket, buffer, MAXBYTE, NULL);   //一直接收客户端socket的send操作
   printf("***Client*** %s\n", buffer);
  }
  closesocket(clientsocket);        //关闭socket
 }
 closesocket(s);            //关闭监听socket
 WSACleanup();            //卸载
 getchar();             
 exit(0);
}
/* window socket 客户端编程测试*/
#include <stdio.h>      //用于输入、输出函数的调用,printf, gets
#include <winsock2.h>     //socket头文件
#include <Windows.h>     //为了方便调试，所以加入了等待2秒才进行连接server，这里用到了sleep函数
#pragma comment (lib, "ws2_32")   //socket库文件

typedef struct sockaddr_in sockaddr_in;

int main()
{
 Sleep(2000);      //沉睡2秒再连接server
 WSADATA wsaData;
 WSAStartup(MAKEWORD(2, 2), &wsaData);
 SOCKET s=socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
 sockaddr_in sockaddr;
 sockaddr.sin_family=PF_INET;
 sockaddr.sin_addr.S_un.S_addr=inet_addr("127.0.0.1");
 sockaddr.sin_port=htons(9000);
 connect(s, (SOCKADDR*)&sockaddr, sizeof(SOCKADDR));
 char buffer[MAXBYTE]={0};
 recv(s, buffer, MAXBYTE, NULL);
 printf("***SERVER***%s", buffer);
 while(TRUE)
 {
  char* mymsg = (char *)malloc(sizeof(char) * 100000);
  printf("You can chat with server now:\n");
  gets(mymsg);
  send(s, mymsg, strlen(mymsg)+sizeof(char), NULL);
  /*
   recv函数中的bufferlength参数是可以固定值的
   send函数中的bufferlength参数不能固定值，需要看实际长度，并且考虑到'\0'字符串
  */
 }
 closesocket(s);
 WSACleanup();
 getchar();
 exit(0);
}

/* window socket 客户端编程测试*/
#include <stdio.h>      //用于输入、输出函数的调用,printf, gets
#include <winsock2.h>     //socket头文件
#include <Windows.h>     //为了方便调试，所以加入了等待2秒才进行连接server，这里用到了sleep函数
#pragma comment (lib, "ws2_32")   //socket库文件

typedef struct sockaddr_in sockaddr_in;

int main()
{
 Sleep(2000);      //沉睡2秒再连接server
 WSADATA wsaData;
 WSAStartup(MAKEWORD(2, 2), &wsaData);
 SOCKET s=socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
 sockaddr_in sockaddr;
 sockaddr.sin_family=PF_INET;
 sockaddr.sin_addr.S_un.S_addr=inet_addr("127.0.0.1");
 sockaddr.sin_port=htons(9000);
 connect(s, (SOCKADDR*)&sockaddr, sizeof(SOCKADDR));
 char buffer[MAXBYTE]={0};
 recv(s, buffer, MAXBYTE, NULL);
 printf("***SERVER***%s", buffer);
 while(TRUE)
 {
  char* mymsg = (char *)malloc(sizeof(char) * 100000);
  printf("You can chat with server now:\n");
  gets(mymsg);
  send(s, mymsg, strlen(mymsg)+sizeof(char), NULL);
  /*
   recv函数中的bufferlength参数是可以固定值的
   send函数中的bufferlength参数不能固定值，需要看实际长度，并且考虑到'\0'字符串
  */
 }
 closesocket(s);
 WSACleanup();
 getchar();
 exit(0);
}