Windows下C语言的Socket编程例子（TCP和UDP）

一。 <TCP>

server端：

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#include "stdafx.h"
#include <stdio.h>
#include <winsock2.h>

#pragma comment(lib,"ws2_32.lib")

int main(int argc, char* argv[])
{
//初始化WSA
WORD sockVersion = MAKEWORD(2,2);
WSADATA wsaData;
if(WSAStartup(sockVersion, &wsaData)!=0)
{
return 0;
}

//创建套接字
SOCKET slisten = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if(slisten == INVALID_SOCKET)
{
printf("socket error !");
return 0;
}

//绑定IP和端口
sockaddr_in sin;
sin.sin_family = AF_INET;
sin.sin_port = htons(8888);
sin.sin_addr.S_un.S_addr = INADDR_ANY;
if(bind(slisten, (LPSOCKADDR)&sin, sizeof(sin)) == SOCKET_ERROR)
{
printf("bind error !");
}

//开始监听
if(listen(slisten, 5) == SOCKET_ERROR)
{
printf("listen error !");
return 0;
}

//循环接收数据
SOCKET sClient;
sockaddr_in remoteAddr;
int nAddrlen = sizeof(remoteAddr);
char revData[255];
while (true)
{
printf("等待连接...\n");
sClient = accept(slisten, (SOCKADDR *)&remoteAddr, &nAddrlen);
if(sClient == INVALID_SOCKET)
{
printf("accept error !");
continue;
}
printf("接受到一个连接：%s \r\n", inet_ntoa(remoteAddr.sin_addr));

//接收数据
int ret = recv(sClient, revData, 255, 0);
if(ret > 0)
{
revData[ret] = 0x00;
printf(revData);
}

//发送数据
char * sendData = "你好，TCP客户端！\n";
send(sClient, sendData, strlen(sendData), 0);
closesocket(sClient);
}

closesocket(slisten);
WSACleanup();
return 0;
}
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client端：

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#include "stdafx.h"
#include <WINSOCK2.H>
#include <STDIO.H>

#pragma comment(lib,"ws2_32.lib")

int main(int argc, char* argv[])
{
WORD sockVersion = MAKEWORD(2,2);
WSADATA data;
if(WSAStartup(sockVersion, &data) != 0)
{
return 0;
}

SOCKET sclient = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if(sclient == INVALID_SOCKET)
{
printf("invalid socket !");
return 0;
}

sockaddr_in serAddr;
serAddr.sin_family = AF_INET;
serAddr.sin_port = htons(8888);
serAddr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
if (connect(sclient, (sockaddr *)&serAddr, sizeof(serAddr)) == SOCKET_ERROR)
{
printf("connect error !");
closesocket(sclient);
return 0;
}
char * sendData = "你好，TCP服务端，我是客户端!\n";
send(sclient, sendData, strlen(sendData), 0);

char recData[255];
int ret = recv(sclient, recData, 255, 0);
if(ret > 0)
{
recData[ret] = 0x00;
printf(recData);
}
closesocket(sclient);
WSACleanup();
return 0;
}
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二. <UDP>

SERVER 端

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 }

CLIENT 端

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 }

转自:http://blog.csdn.net/ssun125/article/details/8525823