Network Programming with Windows Sockets

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1、IIIntroductiontoIntroductiontoNetworkingNetworking1NetworkingandNetworkProgramming2TCP/IPOverview3WinSockOverview4VisualC++P2/V6/Q7ProgrammingWinsock305941aw11.15.94PartsLP#2Chapter1■NetworkingandNetworkProgramming311NetworkingNetworkingandNetworkandNetworkPro

2、grammingProgrammingP2/Vol.6/s&n6ProgrammingWinSock#30594-1rob11.14.94CH01LP#44PartI■IntroductiontoNetworkingThepurposeofthisbookistoshowyouhowtomakenetwork-awareapplicationsthatrunontheMicrosoftWindowsandWindowsNToperatingsystemsusingtheWin-dowsSockets(WinSock

3、)ApplicationProgrammingInterface(API).Tothatend,sev-eralpracticalexamplesareexaminedthatutilizethebasicfunctionalityofWinSock.Networkoperatingsystems,suchasWindowsforWorkgroupsandWindowsNT,providebasicfileandprintersharingservices.Thismostbasicleveloffunctiona

4、lityisprovided“outofthebox.”Network-awareapplicationsareprogramsthatusethecapa-bilitiesofacollectionofconnectedcomputers.Network-awareprogramsrangefromcustomapplicationsthattransferdataamongcomputersonanetworktomainstreamapplicationsthatenableelectronicmailand

5、remotedatabaseaccess.TheWinSockAPIisalibraryoffunctionsthataprogrammercanusetobuildthesenetwork-awareapplications.WinSockhasitsrootsinBerkeleysocketsasintroducedintheBerkeleySoftwareDistributionofUNIX.WinSockusestheTCP/IP(TransmissionControlPro-tocol/InternetP

6、rotocol)suite,whichprovidestheformalrulesofbehaviorthatgovernnetworkcommunicationsbetweenallcomputersrunningthisparticularcomputernet-workingprotocol.BeforeIbegintheexaminationofnetworkprogramming,lookatthebasicsofcom-puternetworkingingeneral.Anetworkcanbeloos

7、elydefinedasacollectionoftwoormorecomputersthathavesomesortofcommunicationpathbetweenthem.Anetworkcanbelooselyclassifiedaseitheralocalareanetwork(LAN)orwide-areanetwork(WAN).TheuseofthetermsLANandWANissomewhatmisleadingbecausewhichtermyouuseisrelativetothepart

8、icularnetworkinstallationyou’redescribing.Gener-allyspeaking,aLANcoversamuchmoregeographicallyrestrictedareathandoesaWAN.WhereasaLANmayconnectcomputerswithinanofficebuilding,aWANma