TCP/UDP的客户端/服务器编程

1、tcp客户端

#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;

}

2、tcp服务器

#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;

}

3、udp客户端

#include "stdafx.h"

#include <stdio.h>

#include <winsock2.h>

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

int main(int argc, char* argv[])

{

WORD socketVersion = MAKEWORD(2,2);

WSADATA wsaData;

if(WSAStartup(socketVersion, &wsaData) != 0)

{

return 0;

}

SOCKET sclient = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);

sockaddr_in sin;

sin.sin_family = AF_INET;

sin.sin_port = htons(8888);

sin.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");

int len = sizeof(sin);

char * sendData = "来自客户端的数据包.\n";

sendto(sclient, sendData, strlen(sendData), 0, (sockaddr *)&sin, len);

char recvData[255];

int ret = recvfrom(sclient, recvData, 255, 0, (sockaddr *)&sin, &len);

if(ret > 0)

{

recvData[ret] = 0x00;

printf(recvData);

}

closesocket(sclient);

WSACleanup();

return 0;

}

4、udp服务器

#include "stdafx.h"

#include <stdio.h>

#include <winsock2.h>

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

int main(int argc, char* argv[])

{

WSADATA wsaData;

WORD sockVersion = MAKEWORD(2,2);

if(WSAStartup(sockVersion, &wsaData) != 0)

{

return 0;

}

SOCKET serSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);

if(serSocket == INVALID_SOCKET)

{

printf("socket error !");

return 0;

}

sockaddr_in serAddr;

serAddr.sin_family = AF_INET;

serAddr.sin_port = htons(8888);

serAddr.sin_addr.S_un.S_addr = INADDR_ANY;

if(bind(serSocket, (sockaddr *)&serAddr, sizeof(serAddr)) == SOCKET_ERROR)

{

printf("bind error !");

closesocket(serSocket);

return 0;

}

sockaddr_in remoteAddr;

int nAddrLen = sizeof(remoteAddr);

while (true)

{

char recvData[255];

int ret = recvfrom(serSocket, recvData, 255, 0, (sockaddr *)&remoteAddr, &nAddrLen);

if (ret > 0)

{

recvData[ret] = 0x00;

printf("接受到一个连接：%s \r\n", inet_ntoa(remoteAddr.sin_addr));

printf(recvData);

}

char * sendData = "一个来自服务端的UDP数据包\n";

sendto(serSocket, sendData, strlen(sendData), 0, (sockaddr *)&remoteAddr, nAddrLen);

}

closesocket(serSocket);

WSACleanup();

return 0;

}