【正文】 通信網(wǎng)絡(luò)是一系列的設(shè)備、機(jī)構(gòu)和進(jìn)程，通過它們，附著在網(wǎng)絡(luò)上的終端用戶設(shè)備能夠進(jìn)行有意義的信息交換。它涉及到網(wǎng)絡(luò)傳輸協(xié)議、網(wǎng)絡(luò)編程 接口等內(nèi)容。（ 4） 視頻會(huì)議系統(tǒng)的終端設(shè)備承擔(dān)了多種媒體信息的輸入、輸出和處理，以及用戶和網(wǎng)絡(luò)之間的連接、交互和控制等多項(xiàng)任務(wù)。它屬于用戶數(shù)字通信設(shè)備，在系統(tǒng)中處在用戶的視聽、數(shù)據(jù)輸入 /輸出設(shè)備和網(wǎng)絡(luò)之間。（ 1） 視頻會(huì)議中有時(shí)需要進(jìn)行多點(diǎn)間的信息傳輸和交換，這時(shí)可以借助于多點(diǎn)控制單元（ MCU）來實(shí)現(xiàn)。多點(diǎn)控制單元實(shí)際上就是一臺(tái)多媒體信息交換機(jī)，實(shí)現(xiàn)多點(diǎn)呼叫和連接，實(shí)現(xiàn)視頻廣播、視頻選擇、音頻混合、數(shù)據(jù)廣播等功能，完成各終端信號(hào)的匯接與切換。 MCU 將各個(gè)終端送來的信號(hào)進(jìn)行分離，抽取出音頻、視頻、數(shù)據(jù)和信令， 分別送到相應(yīng)的處理單元，進(jìn)行音頻混合或切換，視頻切換、數(shù)據(jù)廣播、路由選擇、會(huì)議控制、定時(shí)和呼叫處理等，處理后的信號(hào)由復(fù)用器按照 ，然后經(jīng)網(wǎng)絡(luò)接口送到指定端口。（ 5） Fundamentals of Programming Visual C++ The 21st century are the information societies, unceasingly grow take the information technology as the main symbol hightech industry in the entire economical proportion, along with the puter technology rapid development, the society also day by day enhance to talented person39。s puter application and the development level request, are the adaption situations, VC++ technology and its the product are a huge domain which now the world puter develops. Windows 2020/xp is the present mainstream graph operating system, moves the various Windows operating system personal puter already in the global family and the work environment the widespread use, but more and more many personal puter had the Inter function and the multimedia function impel to be strong to various function, speed quick application software further demand. At present has one kind the success which obtains to Microsoft to carry on the slander the atmosphere, however, the Microsoft success adds on it to the standardized pledge, the technology which enables to have the Windows programmers which pledge uses them to grasp in the global scope to obtain the more and more big repayment, because the western society39。s acknowledgement and the puter more and more perated into in each person39。s life, thus grows day by day to their technical demand, thus caused them the repayment, the ine and other various aspects correspondingly has obtained the satisfactory result. Visual the C++ programming language is at present extremely widespread visible development kit which promotes by Microsoft Corporation, may develop using Visual C++ based on the Widnows platform 32 applications procedure, depends upon the formidable piler as well as the work and the database development ability, may develop the function formidable application procedure with Visual C++. VC++ is in the operating system the rapid application development environment newest edition. It also is in the current Windows platform the first prehensive support newest Web service fast development kit. Regardless of is the enterprise level user, or individual development, all can be relaxed using VC++, quickly develop outstandingly based on the correspondence procedure, the development highly effective nimble document operation sequence, the development nimble highly effective database operation sequence, and so on. VC++ is the industry standard RAD environment which the only support all newly appears, (expansion mark language) /XSL (may expand style language) including XML, SOAP (simple object deposit and withdrawal agreement) and WSDL (Web server description language) and so on. VC++ is the visible fast application procedure development language, it has provided the visible integrated development environment, this environment has provided a series of nimble and the advanced tool for the application programming personnel, may widely use in the type application programming. In the VC++ integrated development environment, the user may design the procedure code, the operating procedure, carries on the program error the debugging and so on, the visible method of exploitation reduced the application procedure development difficulty. The VC++ foundation programming language has the objectoriented characteristic C++ language. C++ has the code stably, the readability good, the translation speed is quick, the efficiency higher merit, and the objectoriented concept will obtain the full display, enable this language to have the brandnew development space Uses VC++ , we nearly may handle any matter, but also may pose plants each kind of type the application procedure, dynamic link storehouse (DLL), CON, or CORBA object, CGI/ISAPI procedure, Microsoft Back Office applicatio