simpletcp.cpp

这是一个实现TCP协议的简化源程序,对初学C++网络编程的人有用处.

// simpletcp.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "simpletcp.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// The one and only application object

CWinApp theApp;

using namespace std;
UINT server(LPVOID pParam);

int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
{
	int nRetCode = 0;

	cout<<"press esc to terminate programm\r\n";

	AfxBeginThread(server,0);
	while(_getch()!=27);


	return nRetCode;
}
UINT server(LPVOID pParam)
{
	cout<<"startup tcp server\r\n";
	SOCKET server;
	WSADATA wsaData;
	sockaddr_in local;
	int wsaret=WSAStartup(MAKEWORD(2,2),&wsaData);
	if(wsaret!=0)
	{
		return 0;
	}
	local.sin_family=AF_INET;
	local.sin_addr.s_addr=INADDR_ANY;
	local.sin_port=htons((u_short)20248);
	server=socket(AF_INET,SOCK_STREAM,0);
	if(server==INVALID_SOCKET)
	{
		return 0;
	}
	if(bind(server,(sockaddr*)&local,sizeof(local))!=0)
		return 0;
	if(listen(server,10)!=0)
		return 0;
	SOCKET	 client;
	sockaddr_in from;
	int fromlen=sizeof(from);
	while(true)
	{
		char temp[512];
		client=accept(server,(sockaddr*)&from,&fromlen);
		sprintf(temp,"you ip is %s\r\n",inet_ntoa(from.sin_addr));
		send(client,temp,strlen(temp),0);
		cout<<"connection from"<<inet_ntoa(from.sin_addr)<<"\r\n";
		closesocket(client);

	}
	closesocket(server);
	WSACleanup();
	return 0;

}