network.cpp

vc6.0是一个很好的开放环境

// Network.cpp: implementation of the CNetwork class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "Network.h"



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

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CNetwork::CNetwork()
{
   
}

CNetwork::~CNetwork()
{

}

bool CNetwork::InitialSocket()
{
    //初始化变量
	m_hSocket=NULL;
	m_iReceived=0;         //已接收的字节数

	WSADATA wsa;
	if(WSAStartup(MAKEWORD(2, 2), &wsa) == SOCKET_ERROR)
		return false;
	if(LOBYTE(wsa.wVersion) != 2 || HIBYTE(wsa.wVersion) != 2)
	{
		WSACleanup();
		return false;
	}

	//创建套接字
	m_hSocket= socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
	if(m_hSocket == INVALID_SOCKET)
	{
		m_hSocket = NULL;
		TRACE0("创建套节子失败");
		return false;
	}
	
	//填充地址结构
	memset(&m_sockAddr, 0, sizeof(m_sockAddr));
	m_sockAddr.sin_family = AF_INET;
	m_sockAddr.sin_addr.s_addr = inet_addr(m_cIP);
	m_sockAddr.sin_port = htons(m_usPort);

	int SendTimeout   =   1000*60;//ms
    int RecvTimeout   =   1000*90;//ms
	if(::setsockopt(m_hSocket,SOL_SOCKET,SO_SNDTIMEO,(char*)&SendTimeout,   sizeof(int))==SOCKET_ERROR)
	{  //设置发送超时
		return false;
	}

	
  if(::setsockopt(m_hSocket,SOL_SOCKET,SO_RCVTIMEO,(char*)&RecvTimeout,   sizeof(int))==SOCKET_ERROR)
	{
		//设置接收超时
		return false;
	}  


	return true;
}

bool CNetwork::ConnectServer()
{
	if(connect(m_hSocket,(sockaddr*)&m_sockAddr,sizeof(m_sockAddr))==0)
		return true;
	else
		return false;
}

bool CNetwork::SendString(char *buf, int length)
{
	int nLeft,idx,ret,flag=1;
    nLeft=length;
	idx=0;
	while(nLeft>0) //确保完全发送出去
	{
       ret=send(m_hSocket,&buf[idx],nLeft,0);
	   if(ret==SOCKET_ERROR)
	   {
		   flag=0;
		   closesocket(m_hSocket);  //关闭套接字
		   break;
	   }
	   nLeft-=ret;
	   idx+=ret;
	}
	//返回判断
    if(flag==0)
		return false;
	else
	{
		TRACE1("send %d",ret);
		return true;
	}
}

bool CNetwork::GetString(char *recBuf,int recBufSize)
{
	int ret,nLeft,idx,flag=1,icount=0;
	nLeft=recBufSize;
	idx=0;
	while(nLeft>0)
	{
        ret=recv(m_hSocket,&recBuf[idx],nLeft,0);
        if(ret==SOCKET_ERROR || ret==0 || ret==WSAETIMEDOUT) //套接字出错或者已经关闭或超时
		{
			flag=0;
			closesocket(m_hSocket); //关闭套接字
			break;
		}
		idx+=ret;
		nLeft-=ret;
	}

    //返回判断
    if(flag==0)
	{
		TRACE1("recv errorcode: %d",ret);
		TRACE1("WSAGetLastError(): %d",WSAGetLastError());
		return false;
	}
	else
		return true;
	
	//if no data arrives within the period specified in SO_RCVTIMEO 
	//the recv function returns WSAETIMEDOUT, 
	//and if data is received, recv returns SUCCESS. 
}

void CNetwork::CloseSock()
{
  if(m_hSocket != NULL)
  {
	  closesocket(m_hSocket);
	  m_hSocket=NULL;
	  WSACleanup();
	  //AfxMessageBox("closesocket  ok!");
  }
}

bool CNetwork::ReConnectServer()  //重新连接应用服务器
{
	int i;
	
	if(m_hSocket != NULL)
	{
		closesocket(m_hSocket);
		m_hSocket=NULL;
	}
	//创建套接字
	m_hSocket= socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
	if(m_hSocket == INVALID_SOCKET)
	{
		m_hSocket = NULL;
		TRACE0("重新创建套节子失败");
		return false;
	}
	
	int SendTimeout   =   1000*60;//ms
    int RecvTimeout   =   1000*90;//ms
	if(::setsockopt(m_hSocket,SOL_SOCKET,SO_SNDTIMEO,(char*)&SendTimeout,   sizeof(int))==SOCKET_ERROR)
	{  //设置发送超时
		return false;
	}

	
  if(::setsockopt(m_hSocket,SOL_SOCKET,SO_RCVTIMEO,(char*)&RecvTimeout,   sizeof(int))==SOCKET_ERROR)
	{
		//设置接收超时
		return false;
	}  
	
	for(i=0;i<3;i++) //重新连接尝试3次
	{
		if(connect(m_hSocket,(sockaddr*)&m_sockAddr,sizeof(m_sockAddr))==0)
			break;
		Sleep(1000);
	}
	if(i>=3)
	{
		i=0;
		TRACE0("重新连接socket服务器<试图3次>失败");
		return false;
	}
	else
	{
		i=0;
		TRACE0("重新连接socket服务器<试图3次>成功");
		return true;
	}
}