Windows下C语言的Socket编程例子（TCP和UDP）

àì夳堔傛蜴生んèń 2022-08-25 10:53 232阅读 0赞

一。  <TCP>

server端：

![复制代码][copycode.gif]

1 #include "stdafx.h"
     2 #include <stdio.h>
     3 #include <winsock2.h>
     4 
     5 #pragma comment(lib,"ws2_32.lib")
     6 
     7 int main(int argc, char* argv[])
     8 {
     9     //初始化WSA
    10     WORD sockVersion = MAKEWORD(2,2);
    11     WSADATA wsaData;
    12     if(WSAStartup(sockVersion, &wsaData)!=0)
    13     {
    14         return 0;
    15     }
    16 
    17     //创建套接字
    18     SOCKET slisten = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    19     if(slisten == INVALID_SOCKET)
    20     {
    21         printf("socket error !");
    22         return 0;
    23     }
    24 
    25     //绑定IP和端口
    26     sockaddr_in sin;
    27     sin.sin_family = AF_INET;
    28     sin.sin_port = htons(8888);
    29     sin.sin_addr.S_un.S_addr = INADDR_ANY; 
    30     if(bind(slisten, (LPSOCKADDR)&sin, sizeof(sin)) == SOCKET_ERROR)
    31     {
    32         printf("bind error !");
    33     }
    34 
    35     //开始监听
    36     if(listen(slisten, 5) == SOCKET_ERROR)
    37     {
    38         printf("listen error !");
    39         return 0;
    40     }
    41 
    42     //循环接收数据
    43     SOCKET sClient;
    44     sockaddr_in remoteAddr;
    45     int nAddrlen = sizeof(remoteAddr);
    46     char revData[255]; 
    47     while (true)
    48     {
    49         printf("等待连接...\n");
    50         sClient = accept(slisten, (SOCKADDR *)&remoteAddr, &nAddrlen);
    51         if(sClient == INVALID_SOCKET)
    52         {
    53             printf("accept error !");
    54             continue;
    55         }
    56         printf("接受到一个连接：%s \r\n", inet_ntoa(remoteAddr.sin_addr));
    57         
    58         //接收数据
    59         int ret = recv(sClient, revData, 255, 0);        
    60         if(ret > 0)
    61         {
    62             revData[ret] = 0x00;
    63             printf(revData);
    64         }
    65 
    66         //发送数据
    67         char * sendData = "你好，TCP客户端！\n";
    68         send(sClient, sendData, strlen(sendData), 0);
    69         closesocket(sClient);
    70     }
    71     
    72     closesocket(slisten);
    73     WSACleanup();
    74     return 0;
    75 }

![复制代码][copycode.gif]

client端：

![复制代码][copycode.gif]

1 #include "stdafx.h"
     2 #include <WINSOCK2.H>
     3 #include <STDIO.H>
     4 
     5 #pragma  comment(lib,"ws2_32.lib")
     6 
     7 
     8 int main(int argc, char* argv[])
     9 {
    10     WORD sockVersion = MAKEWORD(2,2);
    11     WSADATA data; 
    12     if(WSAStartup(sockVersion, &data) != 0)
    13     {
    14         return 0;
    15     }
    16 
    17     SOCKET sclient = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    18     if(sclient == INVALID_SOCKET)
    19     {
    20         printf("invalid socket !");
    21         return 0;
    22     }
    23 
    24     sockaddr_in serAddr;
    25     serAddr.sin_family = AF_INET;
    26     serAddr.sin_port = htons(8888);
    27     serAddr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1"); 
    28     if (connect(sclient, (sockaddr *)&serAddr, sizeof(serAddr)) == SOCKET_ERROR)
    29     {
    30         printf("connect error !");
    31         closesocket(sclient);
    32         return 0;
    33     }
    34     char * sendData = "你好，TCP服务端，我是客户端!\n";
    35     send(sclient, sendData, strlen(sendData), 0);
    36 
    37     char recData[255];
    38     int ret = recv(sclient, recData, 255, 0);
    39     if(ret > 0)
    40     {
    41         recData[ret] = 0x00;
    42         printf(recData);
    43     }
    44     closesocket(sclient);
    45     WSACleanup();
    46     return 0;
    47 }

![复制代码][copycode.gif]

二. <UDP>

SERVER 端

![复制代码][copycode.gif]

1 #include "stdafx.h"
     2 #include <stdio.h>
     3 #include <winsock2.h>
     4 
     5 #pragma comment(lib, "ws2_32.lib") 
     6 
     7 int main(int argc, char* argv[])
     8 {
     9     WSADATA wsaData;
    10     WORD sockVersion = MAKEWORD(2,2);
    11     if(WSAStartup(sockVersion, &wsaData) != 0)
    12     {
    13         return 0;
    14     }
    15 
    16     SOCKET serSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); 
    17     if(serSocket == INVALID_SOCKET)
    18     {
    19         printf("socket error !");
    20         return 0;
    21     }
    22 
    23     sockaddr_in serAddr;
    24     serAddr.sin_family = AF_INET;
    25     serAddr.sin_port = htons(8888);
    26     serAddr.sin_addr.S_un.S_addr = INADDR_ANY;
    27     if(bind(serSocket, (sockaddr *)&serAddr, sizeof(serAddr)) == SOCKET_ERROR)
    28     {
    29         printf("bind error !");
    30         closesocket(serSocket);
    31         return 0;
    32     }
    33     
    34     sockaddr_in remoteAddr;
    35     int nAddrLen = sizeof(remoteAddr); 
    36     while (true)
    37     {
    38         char recvData[255];  
    39         int ret = recvfrom(serSocket, recvData, 255, 0, (sockaddr *)&remoteAddr, &nAddrLen);
    40         if (ret > 0)
    41         {
    42             recvData[ret] = 0x00;
    43             printf("接受到一个连接：%s \r\n", inet_ntoa(remoteAddr.sin_addr));
    44             printf(recvData);            
    45         }
    46 
    47         char * sendData = "一个来自服务端的UDP数据包\n";
    48         sendto(serSocket, sendData, strlen(sendData), 0, (sockaddr *)&remoteAddr, nAddrLen);    
    49 
    50     }
    51     closesocket(serSocket); 
    52     WSACleanup();
    53     return 0;
    54 }

![复制代码][copycode.gif]

CLIENT 端

![复制代码][copycode.gif]

1 #include "stdafx.h"
     2 #include <stdio.h>
     3 #include <winsock2.h>
     4 
     5 #pragma comment(lib, "ws2_32.lib") 
     6 
     7 int main(int argc, char* argv[])
     8 {
     9     WORD socketVersion = MAKEWORD(2,2);
    10     WSADATA wsaData; 
    11     if(WSAStartup(socketVersion, &wsaData) != 0)
    12     {
    13         return 0;
    14     }
    15     SOCKET sclient = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
    16     
    17     sockaddr_in sin;
    18     sin.sin_family = AF_INET;
    19     sin.sin_port = htons(8888);
    20     sin.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
    21     int len = sizeof(sin);
    22     
    23     char * sendData = "来自客户端的数据包.\n";
    24     sendto(sclient, sendData, strlen(sendData), 0, (sockaddr *)&sin, len);
    25 
    26     char recvData[255];     
    27     int ret = recvfrom(sclient, recvData, 255, 0, (sockaddr *)&sin, &len);
    28     if(ret > 0)
    29     {
    30         recvData[ret] = 0x00;
    31         printf(recvData);
    32     }
    33 
    34     closesocket(sclient);
    35     WSACleanup();
    36     return 0;
    37 }

[copycode.gif]: /images/20220824/d38f84b2a04e4dec95aff9bffee3b20c.png