Implementation of CClient

最新推荐文章于 2024-08-11 09:38:35 发布

原创最新推荐文章于 2024-08-11 09:38:35 发布 · 624 阅读

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CC 4.0 BY-SA版权

文章标签：

#server #socket #string #exception #stream #null

本文介绍了一个名为CClient的客户端类的设计与实现细节，该类用于处理与服务器之间的消息发送和接收。文章深入探讨了客户端如何创建套接字、绑定本地地址、连接到指定服务器并进行数据交换的过程。

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void CClient::send_message( const std::string& strMsg )
{
if( send( m_iFlIndCli, strMsg.c_str(), SZBUFF, 0 ) < 0 )
_error( "Can not send message to connected server!" );

if( !_receive_from_server() ) exit( 1 );
}//

bool CClient::_bind()
{
if( bind( m_iFlIndCli, ( TSOCKADDR* )&m_addrCli, sizeof( m_addrCli ) ) < 0 )
{
  _error( "Can't bind to the computer(client)!" );
  close( m_iFlIndCli );
  return false;
}//

return true;
}//

bool CClient:: _socket()
{
if( ( m_iFlIndCli = socket( AF_INET, SOCK_STREAM, 0 ) ) < 0 )
{
  _error( "Can't create a sock at this client!" );
  return false;
}

return true;
}//

void CClient::_write_log( const char* sz )
{
try
{
  long tmsp = time( NULL );
  ///ctime( &tmsp );
  char szFileName[ SZBUFF ];

  sprintf( szFileName, "%i.log", tmsp );
  ofstream of( szFileName );

  of<<sz<<endl<<endl;

cout<<"A log file is created... ..."<<endl;

of.close();
}
catch( exception& e )
{
_error( const_cast<char*>( e.what() ) );
}
}//

bool CClient::_receive_from_server()
{
char szRet[ SZBUFF ];
if( recv( m_iFlIndCli, szRet, SZBUFF, 0 ) < 0 )
{
  _error( "Can't receive data from the asked server!" );
  close( m_iFlIndCli );
  return false;
}

if( m_fpGuiOutput )
  m_fpGuiOutput( szRet );

cout<<"==================================="<<endl
     <<"Receive from server"<<endl
     <<"==================================="<<endl
     <<szRet<<endl
     <<"==================================="<<endl;

_write_log( szRet );

return true;
}//

bool CClient::_connect()
{
socklen_t iLen = sizeof( m_addrSer );

///if( connect( m_iFlIndCli, ( TSOCKADDR* )&m_addrCli, iLen ) < 0 )
if( connect( m_iFlIndCli, ( TSOCKADDR* )&m_addrSer, iLen ) < 0 )
{
  _error( "The client can't connect to the server!" );
  close( m_iFlIndCli );
  return false;
}

return true;

}//

void CClient::_init( const string& strIP, int iSerPort, int iCliPort )
{
if( !_socket() ) exit( 1 );
///
///configure for target server
///
memset( &m_addrSer, 0, sizeof( m_addrSer ) );
m_addrSer.sin_family = AF_INET;
inet_aton( strIP.c_str(), &m_addrSer.sin_addr );
m_addrSer.sin_port = htons( iSerPort );
///
///configure for local client who sends msg to the server
///this is not necessary done, because the port could not be always fixed.
///
memset( &m_addrCli, 0, sizeof( m_addrCli ) );
m_addrCli.sin_family = AF_INET;
m_addrCli.sin_port = htons( iCliPort );
m_addrCli.sin_addr.s_addr = htons( INADDR_ANY );

if( !_bind() ) exit( 1 );
if( !_connect() ) exit( 1 );
///if( !_receive_from_server() ) exit( 1 );

}//

CClient::CClient( const string& strIP, int iSerPort, int iCliPort, FPOUTPUT fpGuiOutput )
:m_fpGuiOutput( fpGuiOutput ),
m_iFlIndSer( 0 ),
m_iFlIndCli( 0 )
{
_init( strIP, iSerPort, iCliPort );
}//

CClient::~CClient(){ close( m_iFlIndCli ); }//