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【正文】 ll also learn a little about how LabVIEW has changed over the years. Although LabVIEW is a very powerful simulation tool, it is most often used to gather data from an external source, and it contains many VIs built especially for this purpose. For example, LabVIEW can mand plugin data acquisition, or DAQ, devices to acquire or generate analog and digital signals. You might use DAQ devices and LabVIEW to monitor a temperature, send signals to an external system, or determine the frequency of an unknown signal. LabVIEW also facilitates data transfer over the General Purpose Interface Bus (GPIB), or through your puter39。s graphical programming language, G (see Figure ). The block diagram is the actual executable program. The ponents of a block diagram are lowerlevel VIs, builtin functions, constants, and program execution control structures. You draw wires to connect the appropriate objects together to define the flow of data between them. Front panel objects have corresponding terminals on the block diagram so data can pass from the user to the program and back to the user. In order to use a VI as a subroutine in the block diagram of another VI, it must have an icon with a connector (see Figure ). A VI that is used within another VI is called a subVI and is analogous to a subroutine. The icon is a VI39。s programs are portable across platforms, so you can write a program on a Macintosh and then load and run it on a Windows machine without changing a thing in most applications. You will find LabVIEW applications improving operations in any number of industries, from every kind of engineering and process control to biology, farming, psychology, chemistry, physics, teaching, and many others. Dataflow and the Graphical Programming Language The LabVIEW program development environment is different from standard C or Java development systems in one important respect: While other programming systems use textbased languages to create lines of code, LabVIEW uses a graphical programming language, often called G, to create programs in a pictorial form called a block diagram. Graphical programming eliminates a lot of the syntactical details associated with textbased languages, such as where to put your semicolons and curly braces. (If you don39。一旦你已經(jīng)獲得或接收到數(shù)據(jù)，你就能夠使用 LabVIEW 的許多分析功能子程序來(lái)加工與處理這些數(shù)據(jù)。這就是我們稱之為的 LabVIEW 程序，因?yàn)檫@些功能是由用戶自己通過(guò)軟件定義的，虛擬儀器因而非常靈活，功能強(qiáng)大，并且成本效益高。使 用這種結(jié)構(gòu)， LabVIEW 突出了模塊化編程的概念。前面板對(duì)象在框圖上有相對(duì)應(yīng)的終端，因此數(shù)據(jù)就可以在用戶和后臺(tái)框圖程序之間流動(dòng) 。另外，注意：不論一個(gè) LabVIEW 程序的外形和功能是否和一個(gè)真實(shí)的儀器有關(guān)，我們都把它稱為一個(gè) VI。它依賴于圖形 化的符號(hào)去定義程序的行為而不是依賴于文本語(yǔ)言。以你所期望的任何形式輸出（數(shù)據(jù)）。為了完成你的任務(wù)，一個(gè)完整的虛擬儀器配置包括：你的電腦，即插即用的硬件和 LabVIEW。然而， LabVIEW 不僅僅是一種編程語(yǔ)言，它是專門為那些工作中需要大量編程的工 作的工程師和科學(xué)家們?cè)O(shè)計(jì)的一種交互式程序開發(fā)和執(zhí)行的系統(tǒng)。另一個(gè)原因是 LabVIEW 有豐富的圖形化用戶接口（ GUI），使用這些接口使變成變得很容易。分析庫(kù)包括許多有用的函數(shù)，有信號(hào)產(chǎn)生，信號(hào)處理。 數(shù)據(jù)流和圖形化編程語(yǔ)言 LabVIEW 編程開發(fā)環(huán)境不同于標(biāo)準(zhǔn)的 C 或 Java 開發(fā)系統(tǒng)，其中一個(gè)很重要的方面就是：當(dāng)用其他的基于文本的編程語(yǔ)言去寫一行行代碼時(shí)， LabVIEW 用圖形化編程語(yǔ)言，通常稱為 G 語(yǔ)言，以圖形化形式去編寫程序，即所謂的框圖。之所以叫做虛擬儀器是因?yàn)樗麄兊耐庑魏筒僮魍ǔＪ悄７抡鎸?shí)的物理儀器。 框圖是 VI 的源代碼，由 LabVIE
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