簡單的TCP stream 的程式，client & server。
參考一下…
Client Side:
複製程式
//
// Client.cpp
//
// Extremely simple, stream client example.
// Works in conjunction with Server.cpp.
//
// The program attempts to connect to the server and port
// specified on the command line. The Server program prints
// the needed information when it is started. Once connected,
// the program sends data to the server, waits for a response
// and then exits.
//
// Compile and link with wsock32.lib
//
// Pass the server name and port number on the command line.
//
// Example: Client MyMachineName 2000
//
#include <stdio.h>
#include <winsock.h>
// Function prototype
void StreamClient(char *szServer, short nPort);
// Helper macro for displaying errors
#define PRINTERROR(s) \
fprintf(stderr,"\n%: %d\n", s, WSAGetLastError())
////////////////////////////////////////////////////////////
void main(int argc, char **argv)
{
WORD wVersionRequested = MAKEWORD(1,1);
WSADATA wsaData;
int nRet;
short nPort;
//
// Check for the host and port arguments
//
if (argc != 3)
{
fprintf(stderr,"\nSyntax: client ServerName PortNumber\n");
return;
}
nPort = atoi(argv[2]);
//
// Initialize WinSock and check the version
//
nRet = WSAStartup(wVersionRequested, &wsaData);
if (wsaData.wVersion != wVersionRequested)
{
fprintf(stderr,"\n Wrong version\n");
return;
}
//
// Go do the stuff a stream client does
//
StreamClient(argv[1], nPort);
//
// Release WinSock
//
WSACleanup();
}
////////////////////////////////////////////////////////////
void StreamClient(char *szServer, short nPort)
{
printf("\nStream Client connecting to server: %s on port: %d",
szServer, nPort);
//
// Find the server
//
LPHOSTENT lpHostEntry;
lpHostEntry = gethostbyname(szServer);
if (lpHostEntry == NULL)
{
PRINTERROR("gethostbyname()");
return;
}
//
// Create a TCP/IP stream socket
//
SOCKET theSocket;
theSocket = socket(AF_INET, // Address family
SOCK_STREAM, // Socket type
IPPROTO_TCP); // Protocol
if (theSocket == INVALID_SOCKET)
{
PRINTERROR("socket()");
return;
}
//
// Fill in the address structure
//
SOCKADDR_IN saServer;
saServer.sin_family = AF_INET;
saServer.sin_addr = *((LPIN_ADDR)*lpHostEntry->h_addr_list);
// ^ Server's address
saServer.sin_port = htons(nPort); // Port number from command line
//
// connect to the server
//
int nRet;
nRet = connect(theSocket, // Socket
(LPSOCKADDR)&saServer, // Server address
sizeof(struct sockaddr));// Length of server address structure
if (nRet == SOCKET_ERROR)
{
PRINTERROR("socket()");
closesocket(theSocket);
return;
}
//
// Send data to the server
//
char szBuf[256];
strcpy(szBuf, "From the Client");
nRet = send(theSocket, // Connected socket
szBuf, // Data buffer
strlen(szBuf), // Length of data
0); // Flags
if (nRet == SOCKET_ERROR)
{
PRINTERROR("send()");
closesocket(theSocket);
return;
}
//
// Wait for a reply
//
nRet = recv(theSocket, // Connected socket
szBuf, // Receive buffer
sizeof(szBuf), // Size of receive buffer
0); // Flags
if (nRet == SOCKET_ERROR)
{
PRINTERROR("recv()");
closesocket(theSocket);
return;
}
//
// Display the received data
//
printf("\nData received: %s", szBuf);
closesocket(theSocket);
return;
}
Client Side:
複製程式
//
// Server.cpp
//
// Extremely simple, stream server example.
// Works in conjunction with Client.cpp.
//
// The program sets itself up as a server using the TCP
// protoocl. It waits for data from a client, displays
// the incoming data, sends a message back to the client
// and then exits.
//
// Compile and link with wsock32.lib
//
// Pass the port number that the server should bind() to
// on the command line. Any port number not already in use
// can be specified.
//
// Example: Server 2000
//
#include <stdio.h>
#include <winsock.h>
// Function prototype
void StreamServer(short nPort);
// Helper macro for displaying errors
#define PRINTERROR(s) \
fprintf(stderr,"\n%: %d\n", s, WSAGetLastError())
////////////////////////////////////////////////////////////
void main(int argc, char **argv)
{
WORD wVersionRequested = MAKEWORD(1,1);
WSADATA wsaData;
int nRet;
short nPort;
//
// Check for port argument
//
if (argc != 2)
{
fprintf(stderr,"\nSyntax: server PortNumber\n");
return;
}
nPort = atoi(argv[1]);
//
// Initialize WinSock and check version
//
nRet = WSAStartup(wVersionRequested, &wsaData);
if (wsaData.wVersion != wVersionRequested)
{
fprintf(stderr,"\n Wrong version\n");
return;
}
//
// Do the stuff a stream server does
//
StreamServer(nPort);
//
// Release WinSock
//
WSACleanup();
}
////////////////////////////////////////////////////////////
void StreamServer(short nPort)
{
//
// Create a TCP/IP stream socket to "listen" with
//
SOCKET listenSocket;
listenSocket = socket(AF_INET, // Address family
SOCK_STREAM, // Socket type
IPPROTO_TCP); // Protocol
if (listenSocket == INVALID_SOCKET)
{
PRINTERROR("socket()");
return;
}
//
// Fill in the address structure
//
SOCKADDR_IN saServer;
saServer.sin_family = AF_INET;
saServer.sin_addr.s_addr = INADDR_ANY; // Let WinSock supply address
saServer.sin_port = htons(nPort); // Use port from command line
//
// bind the name to the socket
//
int nRet;
nRet = bind(listenSocket, // Socket
(LPSOCKADDR)&saServer, // Our address
sizeof(struct sockaddr)); // Size of address structure
if (nRet == SOCKET_ERROR)
{
PRINTERROR("bind()");
closesocket(listenSocket);
return;
}
//
// This isn't normally done or required, but in this
// example we're printing out where the server is waiting
// so that you can connect the example client.
//
int nLen;
nLen = sizeof(SOCKADDR);
char szBuf[256];
nRet = gethostname(szBuf, sizeof(szBuf));
if (nRet == SOCKET_ERROR)
{
PRINTERROR("gethostname()");
closesocket(listenSocket);
return;
}
//
// Show the server name and port number
//
printf("\nServer named %s waiting on port %d\n",
szBuf, nPort);
//
// Set the socket to listen
//
printf("\nlisten()");
nRet = listen(listenSocket, // Bound socket
SOMAXCONN); // Number of connection request queue
if (nRet == SOCKET_ERROR)
{
PRINTERROR("listen()");
closesocket(listenSocket);
return;
}
//
// Wait for an incoming request
//
SOCKET remoteSocket;
printf("\nBlocking at accept()");
remoteSocket = accept(listenSocket, // Listening socket
NULL, // Optional client address
NULL);
if (remoteSocket == INVALID_SOCKET)
{
PRINTERROR("accept()");
closesocket(listenSocket);
return;
}
//
// We're connected to a client
// New socket descriptor returned already
// has clients address
//
// Receive data from the client
//
memset(szBuf, 0, sizeof(szBuf));
nRet = recv(remoteSocket, // Connected client
szBuf, // Receive buffer
sizeof(szBuf), // Lenght of buffer
0); // Flags
if (nRet == INVALID_SOCKET)
{
PRINTERROR("recv()");
closesocket(listenSocket);
closesocket(remoteSocket);
return;
}
//
// Display received data
//
printf("\nData received: %s", szBuf);
//
// Send data back to the client
//
strcpy(szBuf, "From the Server");
nRet = send(remoteSocket, // Connected socket
szBuf, // Data buffer
strlen(szBuf), // Lenght of data
0); // Flags
//
// Close BOTH sockets before exiting
//
closesocket(remoteSocket);
closesocket(listenSocket);
return;
}
Description:
===========================================================
Stream, connection-oriented client and server example.
This demonstrates the steps required for a VERY
simple server and client using stream sockets.
Both programs can be run on one machine. If you dial
in to your network, you must be connected even if you
are going to run the programs on one machine.
Example:
First, run Server in the first DOS box,
server 2000
The server program will bind to port 2000 and print it's
host name to stdout.
"Server named MachineName waiting on port 2000"
Then run Client in a second DOS box, using the host
name and port number printed out in step 1.
client MachineName 2000
At that point, the client will send the string
"From the client" to the server. The server will then
respond by sending the string "From the server" back to
the client. Both programs will then exit.
===========================================================
SERVER.CPP Server source code.
Compile and link with WSOCK32.LIB
Only uses C++ so that variables can be
declared near where they are used for the
first time.
CLIENT.CPP Client source code.
Compile and link with WSOCK32.LIB
Only uses C++ so that variables can be
declared near where they are used for the
first time.
===========================================================
