vc api TCP&UDP—helloworld

#include<windows.h>
#pragma comment (lib, "ws2_32")//显式连接套接字库

int main(int argc, char *argv)
{
WSADATA wsaData;
WSAStartup(MAKEWORD(2,2),&wsaData);//初始化套接字库

SOCKET s=socket(PF_INET,SOCK_STREAM,IPPROTO_TCP);

sockaddr_in socketaddr;
socketaddr.sin_family = PF_INET;
socketaddr.sin_addr.S_un.S_addr = inet_addr("127.1.1.0");
socketaddr.sin_port = htons(827);

bind(s,(SOCKADDR*)&socketaddr,sizeof(SOCKADDR));

listen(s,1);

SOCKADDR clientAddr;
int nSize = sizeof(SOCKADDR);
SOCKET clientSock;
clientSock = accept(s,(SOCKADDR*)&clientAddr,&nSize);

send(clientSock,"hello client \r\n",strlen("hello client \r\n")+sizeof(char),NULL);

closesocket(clientSock);
closesocket(s);

WSACleanup();//释放套接字库

return 0;
}

#include<stdio.h>
#include<winsock.h>
#pragma comment (lib,"ws2_32")//显示连接套接字库

int main()
{
WSADATA wsaData;
WSAStartup(MAKEWORD(2,2),&wsaData);//初始化套接字库

SOCKET s = socket(PF_INET,SOCK_STREAM,IPPROTO_TCP);//创建TCP套接字

sockaddr_in socketAddr;
socketAddr.sin_family = PF_INET;
socketAddr.sin_addr.S_un.S_addr = inet_addr("127.1.1.0");
socketAddr.sin_port = htons(827);

connect(s,(SOCKADDR*)&socketAddr,sizeof(SOCKADDR));

char szBuffer[MAXBYTE] = {0};

recv(s,szBuffer,MAXBYTE,NULL);

printf("szBuffer = %s \r\n",szBuffer);

closesocket(s);

WSACleanup();//释放套接字库

system("pause");
return 0;
}

#include <winsock2.h>
#include <stdio.h>
#pragma comment(lib, "ws2_32.lib")

int main()
{
WSADATA          wsData;
SOCKET             server;
SOCKADDR_IN sockAddr;

int                          sClitAddLen;
SOCKET                sClient;
SOCKADDR_IN   sClientAddr;
int                        tmp;
char                       buffer[512];

WSAStartup(MAKEWORD(2,2), &wsData); //初始化winsock
server = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); //创建winsock

/*配置winsock*/
sockAddr.sin_family         = AF_INET;
sockAddr.sin_addr.s_addr = htonl(INADDR_ANY);
sockAddr.sin_port            = htons(5503);
memset(&(sockAddr.sin_zero), 0, sizeof(sockAddr.sin_zero));

/*将winsock绑定到端口*/
if(bind(server, (SOCKADDR *)&sockAddr, sizeof(SOCKADDR)) != 0)
{
printf("bind is failure\n");
return 0;
}

listen(server, 10);       /*在该端口监听*/

while(1)
{
memset(buffer, 0, sizeof(buffer));
sClitAddLen = sizeof(SOCKADDR);

/*响应客户端服务*/
sClient = accept(server, (SOCKADDR *)&sClientAddr, &sClitAddLen);
if(sClient == INVALID_SOCKET)
{
printf("accept is failure\n");
}
else
{
printf("Server is connect with a Client\n");

if(recv(sClient, buffer, 512, 0) == SOCKET_ERROR)
{
printf("recv failed!\n");
}
else
{
printf("%s\n", buffer);
}
}
closesocket(sClient);
}
closesocket(server);
WSACleanup();

return 0;
}

#define _CRT_SECURE_NO_DEPRECATE //屏蔽scanf的警告
#include <winsock2.h>
#include <stdio.h>
#pragma comment(lib, "ws2_32.lib")

int main()
{
int                         tmp;
WSADATA            wsData;
SOCKET               client;
SOCKADDR_IN    sockAddr;
char                       buffer[512];

WSAStartup(MAKEWORD(2,2), &wsData);   //初始化winsock
client = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); //创建winsock

/*配置winsock*/
sockAddr.sin_family        = AF_INET;
sockAddr.sin_addr.s_addr = inet_addr("127.0.0.1");
sockAddr.sin_port           = htons(5503);
memset(&(sockAddr.sin_zero), 0, sizeof(sockAddr.sin_zero));

/*连接到服务端*/
if(connect(client, (SOCKADDR *)&sockAddr, sizeof(sockAddr)) == SOCKET_ERROR)
{
printf("connet is failure \n");
return 0;
}
else
{
printf("connet with the Server \n");
}

scanf("%s",buffer,255);
send(client, buffer, (int)strlen(buffer), 0);   /*向服务端发送数据*/

/*关闭socket并释放其占用的资源*/
closesocket(client);
WSACleanup();

return 0;
}