用代碼實(shí)例詳解C語(yǔ)言中的socket編程

/* window socket 服務(wù)端編程測(cè)試 */
#include <stdio.h>     //用于printf等函數(shù)的調(diào)用
#include <winsock2.h>    //Socket的函數(shù)調(diào)用　
#pragma comment (lib, "ws2_32.lib")  //C語(yǔ)言引用其他類庫(kù)時(shí)，除了.h文件外，還要加入對(duì)應(yīng)的lib文件，如果仍提示錯(cuò)誤則需要在IDE中手動(dòng)加入該鏈接庫(kù)

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"); //需要綁定到本地的哪個(gè)IP地址
 sockaddr.sin_port=htons(9000);       //需要監(jiān)聽(tīng)的端口
 bind(s, (SOCKADDR*)&sockaddr, sizeof(SOCKADDR));  //進(jìn)行綁定動(dòng)作
 listen(s, 1);           //啟動(dòng)監(jiān)聽(tīng)
 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客戶端連接
  printf("***SYS*** New client touched.\n");
  char* msg="Hello, my client.\r\n";
  send(clientsocket, msg, strlen(msg)+sizeof(char), NULL); //這里的第三個(gè)參數(shù)要注意，是加了一個(gè)char長(zhǎng)度的
  printf("***SYS*** HELLO.\n");
  while(TRUE)
  {
   char buffer[MAXBYTE]={0};
   recv(clientsocket, buffer, MAXBYTE, NULL);   //一直接收客戶端socket的send操作
   printf("***Client*** %s\n", buffer);
  }
  closesocket(clientsocket);        //關(guān)閉socket
 }
 closesocket(s);            //關(guān)閉監(jiān)聽(tīng)socket
 WSACleanup();            //卸載
 getchar();             
 exit(0);
}
/* window socket 客戶端編程測(cè)試*/
#include <stdio.h>      //用于輸入、輸出函數(shù)的調(diào)用,printf, gets
#include <winsock2.h>     //socket頭文件
#include <Windows.h>     //為了方便調(diào)試，所以加入了等待2秒才進(jìn)行連接server，這里用到了sleep函數(shù)
#pragma comment (lib, "ws2_32")   //socket庫(kù)文件

typedef struct sockaddr_in sockaddr_in;

int main()
{
 Sleep(2000);      //沉睡2秒再連接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函數(shù)中的bufferlength參數(shù)是可以固定值的
   send函數(shù)中的bufferlength參數(shù)不能固定值，需要看實(shí)際長(zhǎng)度，并且考慮到'\0'字符串
  */
 }
 closesocket(s);
 WSACleanup();
 getchar();
 exit(0);
}

/* window socket 客戶端編程測(cè)試*/
#include <stdio.h>      //用于輸入、輸出函數(shù)的調(diào)用,printf, gets
#include <winsock2.h>     //socket頭文件
#include <Windows.h>     //為了方便調(diào)試，所以加入了等待2秒才進(jìn)行連接server，這里用到了sleep函數(shù)
#pragma comment (lib, "ws2_32")   //socket庫(kù)文件

typedef struct sockaddr_in sockaddr_in;

int main()
{
 Sleep(2000);      //沉睡2秒再連接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函數(shù)中的bufferlength參數(shù)是可以固定值的
   send函數(shù)中的bufferlength參數(shù)不能固定值，需要看實(shí)際長(zhǎng)度，并且考慮到'\0'字符串
  */
 }
 closesocket(s);
 WSACleanup();
 getchar();
 exit(0);
}