1

Pertemuan 9 Windows Socket

( WinSock )

Matakuliah : H0483 – Network Programming

Tahun : 2008

Versi : 2.0

2

Learning Outcomes

Pada akhir pertemuan ini, diharapkan mahasiswa

akan mampu :

• Mendemokan program aplikasi pada sistem operasi windows dengan menggunakan Windows Socket.

3

Outline Materi

• What is Socket ?

• What is Winsock ?• The Socket History• Winsock History• Supported Programming Models• Elements of Winsock Programming• General Program Flow• Iterative Server pada Windows• Concurrent Server pada Windows

4

WinSock

• What is Socket?– Socket is is a programming model originally

designed for network programming under UNIX operating systems.

• What is Winsock?– Winsock stands for Windows Socket; – An Application Programming Interface for

network programming under the Microsoft Windows operating systems.

– It is modeled after UNIX Socket but with platform-specific features added.

5

WinSock

6

WinSock

7

WinSock

8

WinSock

• Supported Programming Models– Synchronous Model– Asynchronous Model

• Synchronous Model– Makes use of blocking-mode I/O function

calls.– What is Blocking I/O?

• Guaranteed either function completed successfully or failed upon function return

• The calling code has to wait (i.e. block) for the function to complete before continuing execution

9

WinSock

• Asynchronous Model– Makes use of non-blocking-mode I/O function

calls.

• What is Non-Blocking I/O?– Guaranteed function will return immediately:– The calling code has to check if the function

has completed before return.– If not, the calling code will have to handle that

itself.(e.g. check at a later time, call the function again, wait for asynchronous event to trigger, etc.)

10

Elements of Winsock Programming

11

Elements of Winsock Programming

• BSD-Style Winsock Functions– Core functions

• accept, bind, closesocket, connect, listen, recv, recvfrom, select, send, sendto, Shutdown, socket

– Auxiliary functions• Getpeername, Getsockname, Getsockopt,

ioctlsocket– Utility functions

• htonl, htons, inet_addr, inet_ntoa, ntohl, ntohs

12

Elements of Winsock Programming

• Windows-Specific Winsock Functions– Core functions

• WSAStartup, WSACleanup, WSAAsyncGettByn, WSAAsyncSelect, WSACancelAsyncRequest, WSAConnect,WSAIoctl, WSARecv, WSARecvFrom, WSASend, WSASendTo, WSASocket

– Auxiliary functions• WSADuplicateSocket, WSAEnumNetworkEvents,

WSAEnumProtocols, WSAGetLastError, WSAGetQOSByName, WSAHtonl, WSAHtons, WSAJoinLeaf, WSANtohl, WSANtohs, WSAProviderConfigChange, WSASetLastError

– Supporting functions• WSACloseEvent, WSACreateEvent, WSAEventSelect,

WSAGetOverlappedResult, WSAResetEvent, WSASetEvent, WSAWaitForMultipleEvents

13

General Program Flow

14

General Program Flow

15

General Program Flow

16

Online References

• References– The Winsock 1.1 and 2.0 Specifications – Winsock Resource Centre at

http://www.winsock.com– Windows socket programming resources at

http://www.sockets.com– Visual C++ On-Line Help and Programming

Reference

17

Iterative Server pada Windows

18

Concurrent Server pada Windows

19

Concurrent Servers

• I/O Models for Concurrent Servers– Synchronous/Blocking Mode I/O

• Multi-threading (Win32 only)• Similar to the UNIX fork( ) multiple-process model.

– Asynchronous/Non-Blocking Mode I/O• Message-driven (All Windows versions)• Overlapped I/O (Win32 only)

– Socket handle signalling– Windows event object signalling– I/O completion routines

– I/O Completion Ports (Windows NT only)

20

Concurrent Server pada Windows

21

Concurrent Server pada Windows

22

Concurrent Server pada Windows

23

Concurrent Server pada Windows

24

Concurrent Server pada Windows

25

Latihan

• Buat Program Echo Server dan program client nya pada Windows dengan menggunakan Winsock. Bahasa Pemrograman yang digunakan bebas.