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L PWSABUF I p B uffe r s , DWORD dwBuffe rCou nt , LPDWORD IpNumbe rOfBytesSent , DWORD dwF l a g s , c o n s t s t r u c t socketaddr * IpTo, int iTo L e n , L PWSAOVE R LAPPED IpOv e r l a p ped , L PWSAOVER LAPPED_COM P L E T ION_ROUT INE I pComp letion Rout i n e
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)j int WSARec v ( SOC K E T s ,
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LPWSABU F I p Buffe r s , DWORD dwBuffe rCou nt , LPDWORD IpNumberOfByt e s Recvd , LPDWORD I p F l a g s , LPWSAOV E R LAPPED I pOve r l a p ped , LPWSAOV E R LAPPED_COM P L E TION_ROUTI N E IpCompletionRoutine
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)j int WSARecv F rom ( SOC K E T s , L PWSABU F I p Buffe r s , DWORD dwBufferCou n t , L PDWORD IpNumberOfByt e s R e cvd , LPDWORD I p F lag s , s t r u c t socketaddr * I p F rom , LPINT I p F rom l e n ,
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LPWSAOV E R LAPPED I pOve r l a p ped , L PWSAOVE R LAPPED_COMPLE TION_ROUTINE IpComplet ionRout i n e
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)j int WSAloct 1 ( SOC K E T s , DWORD dwloCont rolCod e , LPVOID I p v l n Buffer , DWORD c b l n Buffe r , LPVOID I pvOutBuffe r , DWORD c bOutBuffe r , L PDWORD I p c bByt e s Retu rned , L PWSAOVE R LAPPED I pOve r l a p ped , LPWSAOVE R LAPPED_COM P L E TION_ROUTINE IpCompletion Rout i n e j ) BOOL Transmit F i l e ( SOC K E T hSo c k et , HANDLE h F i le , DWORD nNumbe rOfByte sToWrit e ,
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The Ac c e pt E x function allows you to asynchronously accept new con nections while the other functions allow you to perform asynchronous sends and receives on existing connections Given the sheer number of arguments for all of these functions, there is a lot of socket specific knowl edge you'll need to use them This book isn' t about building network pro grams per se-there are plenty of good resources on that already-so we'll skip those aspects and focus just on how to use them for asynchronous pro gramming Doing so is crucial for building scalable sockets applications, particularly on heavily loaded servers WSAOV E R LAP P E D has the same structure as OVE R LAP P E D The completion routine type, L PWSAOVE R LAP P E D_COM P L E T I ON_ROUT I N E , is a function pointer to a slightly different Signature than the file based completion routines seen earlier
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If the I pOve r l a p p e d argument to any of the functions above is non-N U L L, the request may complete asynchronously As with the device functions seen earlier, however, the request may complete synchro nously Asynchronous execution is indicated by a return value of S OC K E T_E R R O R and a subsequent return value of WSA_IO_P E N D I N G from WSAGet L a s t E r r o r Otherwise, the call completes the same as any ordi nary synchronous I / O, and any pertinent output parameters (such as I pN u m b e rOfByt e s R e c v d ) will have been set As with file I / O, if the thread that initiates an asynchronous sockets request exists before that request has completed, that request will be canceled automatically by the OS
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