(TCP)服務器端SOCKET
第一步:初始化套接字庫
第二步:創建套接字
第三步:綁定套接字
第四步:將該套接字置爲監聽狀態
第五步:接收客戶端傳來的連接請求
(TCP)客戶端SOCKET
第一步:初始化套接字庫
第二步:創建套接字
第三步:綁定套接字
第四步:向服務器端發送連接請求
(UDP)服務器端SOCKET
第一步:初始化套接字庫
第二步:創建套接字
第三步:綁定套接字
第四步:向指定IP發送數據
(UDP)客戶端SOCKET
第一步:初始化套接字庫
第二步:創建套接字
第三步:綁定套接字
第四步:向指定IP發送數據
基於UDP的socket編程
sockets（套接字）編程有三種，流式套接字（SOCK_STREAM），數據報套接字（SOCK_DGRAM），原始套接字（SOCK_RAW）；基於UDP的socket編程是採用的數據報套接字。
在這個程序中，將兩個工程添加到一個工作區。同時還要鏈接一個ws2_32.lib的庫文件。
服務器端編程的步驟：
1：加載套接字庫，創建套接字(WSAStartup()/socket())；
2：綁定套接字到一個IP地址和一個端口上(bind())；
3：等待和接收數據(sendto()/recvfrom())；
4：關閉套接字，關閉加載的套接字庫(closesocket()/WSACleanup())。
服務器端代碼如下：
#include <winsock2.h>
#include <stdio.h>
void main()
{
WORD wVersionRequested;
WSADATA wsaData;
int err;
wVersionRequested = MAKEWORD( 1, 1 );
err = WSAStartup( wVersionRequested, &wsaData );
if ( err != 0 )
{
return;
}
if ( LOBYTE( wsaData.wVersion ) != 1 ||
HIBYTE( wsaData.wVersion ) != 1 )
{
WSACleanup( );
return;
}
SOCKET sockSrv=socket(AF_INET,SOCK_DGRAM,0);
SOCKADDR_IN addrSrv;
addrSrv.sin_addr.S_un.S_addr=htonl(INADDR_ANY);
addrSrv.sin_family=AF_INET;
addrSrv.sin_port=htons(7003);
bind(sockSrv,(SOCKADDR*)&addrSrv,sizeof(SOCKADDR));
char recvBuf[50];
SOCKADDR addrClient;
int len=sizeof(SOCKADDR);
recvfrom(sockSrv,recvBuf,50,0,(SOCKADDR*)&addrClient,&len);
printf("%s/n",recvBuf);
closesocket(sockSrv);
WSACleanup();
}
對於基於UDP的socket客戶端來說，要進行如下步驟：
1：創建一個套接字(socket)；
2：向服務器發送數據(sendto);
3：關閉套接字；
代碼如下：
#include <winsock2.h>
#include <stdio.h>
void main()
{
WORD wVersionRequested;
WSADATA wsaData;
int err;
wVersionRequested = MAKEWORD( 2, 2 );
err = WSAStartup( wVersionRequested, &wsaData );
if ( err != 0 ) {
return;
}
if ( LOBYTE( wsaData.wVersion ) != 2 ||
HIBYTE( wsaData.wVersion ) != 2 ) {
WSACleanup( );
return;
}
SOCKET sockClient=socket(AF_INET,SOCK_DGRAM,0);
SOCKADDR_IN addrClient;
addrClient.sin_addr.S_un.S_addr=inet_addr("127.0.0.1");
addrClient.sin_family=AF_INET;
addrClient.sin_port=htons(8889);
SOCKADDR_IN addrSrv;
sendto(sockClient,"hi",3,0,(SOCKADDR*)&addrClient,sizeof(SOCKADDR));
}
VC++ Socket編程 簡單的Tcp/ip服務器端
#include <windows.h>
#include <iostream.h>
#include <winsock.h>
#define NO_FLAGS_SET 0
#define PORT (u_short) 44965
#define MAXBUFLEN 256
INT main(VOID)
{
WSADATA Data;
SOCKADDR_IN serverSockAddr;
SOCKADDR_IN clientSockAddr;
SOCKET serverSocket;
SOCKET clientSocket;
int addrLen=sizeof(SOCKADDR_IN);
int status;
int numrcv;
char buffer[MAXBUFLEN];
/* initialize the Windows Socket DLL */
status=WSAStartup(MAKEWORD(1, 1), &Data);
if (status != 0)
cerr << "ERROR: WSAStartup unsuccessful"
<< endl;
/* zero the sockaddr_in structure */
memset(&serverSockAddr, 0,
sizeof(serverSockAddr));
/* specify the port portion of the address */
serverSockAddr.sin_port=htons(PORT);
/* specify the address family as Internet */
serverSockAddr.sin_family=AF_INET;
/* specify that the address does not matter */
serverSockAddr.sin_addr.s_addr=htonl(INADDR_ANY);
/* create a socket */
serverSocket=socket(AF_INET, SOCK_STREAM, 0);
if (serverSocket == INVALID_SOCKET)
cerr << "ERROR: socket unsuccessful" << endl;
/* associate the socket with the address */
status=bind(serverSocket,
(LPSOCKADDR) &serverSockAddr,
sizeof(serverSockAddr));
if (status == SOCKET_ERROR)
cerr << "ERROR: bind unsuccessful" << endl;
/* allow the socket to take connections */
status=listen(serverSocket, 6);
if (status == SOCKET_ERROR)
cerr << "ERROR: listen unsuccessful" << endl;
/* accept the connection request when one
is received */
clientSocket=accept(serverSocket,
(LPSOCKADDR) &clientSockAddr,
&addrLen);
cout << "Got the connection..." << endl;
while(1)
{
numrcv=recv(clientSocket, buffer,
MAXBUFLEN, NO_FLAGS_SET);
if ((numrcv == 0) || (numrcv == SOCKET_ERROR))
{
cout << "Connection terminated." << endl;
status=closesocket(clientSocket);
if (status == SOCKET_ERROR)
cerr << "ERROR: closesocket unsuccessful"
<< endl;
status=WSACleanup();
if (status == SOCKET_ERROR)
cerr << "ERROR: WSACleanup unsuccessful"
<< endl;
return(1);
}
cout << buffer << endl;
} /* while */
}
VC++ Socket編程 簡單的Tcp/ip客戶端
#include <windows.h>
#include <iostream.h>
#include <winsock.h>
#define NO_FLAGS_SET 0
#define PORT (u_short) 44965
#define DEST_IP_ADDR "192.168.10.158" //Server address
INT main(VOID)
{
WSADATA Data;
SOCKADDR_IN destSockAddr;
SOCKET destSocket;
unsigned long destAddr;
int status;
int numsnt;
char *toSendtxt="Test String";
/* initialize the Windows Socket DLL */
status=WSAStartup(MAKEWORD(1, 1), &Data);
if (status != 0)
cerr << "ERROR: WSAStartup unsuccessful"
<< endl;
/* convert IP address into in_addr form */
destAddr=inet_addr(DEST_IP_ADDR);
/* copy destAddr into sockaddr_in structure */
memcpy(&destSockAddr.sin_addr,
&destAddr, sizeof(destAddr));
/* specify the port portion of the address */
destSockAddr.sin_port=htons(PORT);
/* specify the address family as Internet */
destSockAddr.sin_family=AF_INET;
/* create a socket */
destSocket=socket(AF_INET, SOCK_STREAM, 0);
if (destSocket == INVALID_SOCKET)
{
cerr << "ERROR: socket unsuccessful" << endl;
status=WSACleanup();
if (status == SOCKET_ERROR)
cerr << "ERROR: WSACleanup unsuccessful"
<< endl;
return(1);
}
cout << "Trying to connect to IP Address: "
<< DEST_IP_ADDR << endl;
/* connect to the server */
status=connect(destSocket,
(LPSOCKADDR) &destSockAddr,
sizeof(destSockAddr));
if (status == SOCKET_ERROR)
{
cerr << "ERROR: connect unsuccessful" << endl;
status=closesocket(destSocket);
if (status == SOCKET_ERROR)
cerr << "ERROR: closesocket unsuccessful"
<< endl;
status=WSACleanup();
if (status == SOCKET_ERROR)
cerr << "ERROR: WSACleanup unsuccessful"
<< endl;
return(1);
}
cout << "Connected..." << endl;
while(1)
{
cout << "Sending..." << endl;
numsnt=send(destSocket, toSendtxt,
strlen(toSendtxt) + 1, NO_FLAGS_SET);
if (numsnt != (int)strlen(toSendtxt) + 1)
{
cout << "Connection terminated" << endl;
status=closesocket(destSocket);
if (status == SOCKET_ERROR)
cerr << "ERROR: closesocket unsuccessful"
<< endl;
status=WSACleanup();
if (status == SOCKET_ERROR)
cerr << "ERROR: WSACleanup unsuccessful"
<< endl;
return(1);
}
/* Wait before sending the message again */
Sleep(4800);
} /* while */
}
