计算机专业外文翻译（文献翻译）.doc

外文翻译Introduction of Visual Basic6.0 Visual Basic, Listed VB, Microsoft Corporation to launch a Windows application development tool. Is the worlds most widely used programming language, it was generally acknowledged to be the most efficient programming of a programming method. Whether the development of powerful, reliable performance of the business software, or can be prepared to deal with the practical problems of small practical procedures Visual Basic6.0 is the quickest, most convenient way. What is Visual Basic6.0? Visual refers to the use of visualization of the development of graphical user interface (GUI), generally do not need to prepare a large number of code interface elements to describe the appearance and location, and as long as necessary to drag and drop controls on the screen to the corresponding location will be; Basic refers to the BASIC language, Visual Basic6.0 is because the original BASIC language developed on the basis of that so far includes hundreds of phrases Function and keywords, and many Windows GUI are directly related. Professionals can use Visual Basic6.0 to any other Windows programming language function, you beginners and several Keywords can establish practical application. Visual Basic6.0 provides a learning version, Professional Edition and Enterprise Edition to meet the needs of different developers. Learning version enables programmers to easily develop Windows and Windows NT applications; Professional Edition for professional programmers to provide the complete functions of development tools; Enterprise Edition allows professionals to form the group to create a strong distributed applications. 1 Visual Basic6.0 features Visual Basic6.0 is running on the Windows platform under a visualization of high-level programming languages. Since inception in 1991. Visual Basic6.0 windows3.x to adapt to the Windows 95/98 and Windows NT etc. version of the operating system, widely used in ordinary window category, database management category, data communications network for such application development. Visual Basic6.0 as a computer visualization of the senior programming language, the following notable features:(1) Visual Basic6.0 inherited the Basic language is easy features in Microsoft Visual Basic6.0 development process never forget his roots, programming, even for beginners is a principle of computer-illiterate people, also in a relatively short period of time to prepare a viable Windows procedures. (2) Based on the Dos and the environment than the programming language, Visual Basic6.0 thinking about a fundamental change based on the Dos and the environment than the programming language, Visual Basic6.0 thinking about a fundamental change in the introduction of the Visual Basic6.0 Object-oriented program design, the process design staff from the tedious details of the procedures designed to extricate themselves, programming staff during program development, choose the right people need to structure their own interface. Then arrangements for a reception object to what information do whatever they can. Without the need to consider specific targets of what to do, what to do, what to do after the issue. (3) Visual Basic6.0 has powerful database management functions Visual Basic6.0 support SQL database inquiries, Visual Basic6.0 embedded database management functions can be manipulated almost all of the database format. (4) Development of highly integrated environment is a Visual Basic6.0 including editing, debugging procedures, operating procedures, Compiling procedures such as functional integration program development environment (IDE) (5) Visual Basic6.0 adaptation in the development of Windows-type application Visual Basic6.0 sequence contains a lot of functions, orders and keywords, Most Windows graphical user interface-related, professionals can easily use them to develop powerful Windows application. 2 Visual Basic6.0 Common internal controls Control options can be divided into check box control (Checkbox) and the radio buttons control (Option But ton). Checkbox control, the group revealed a number of options, provided these options True, False or Yes, No option, users can choose which one or more; Option Button controls, the user can choose single group. Option Button and Checkbox control similar functions, however, they also exist between those important differences: the same groups, may also select multiple Checkbox options; But they can only choose one option Button. In Frame, Picture Box Form containers or use both options controls, Users can use group. (1) Radio buttons control (Option Button) in the application process, Sometimes users needs such a choice: Several options were the only choice-species, and must make a choice. Several because it is mutually exclusive. Then, on the need to use Option Button buttons control; Figure 1 is a group of buttons controls, it only allows users in choosing a drink, and must election-species. Control buttons are always a group in the form of. In a control group, only one is always buttons at selected state; if selected by one of them. The remaining buttons will automatically remove non-selected. (2)Check box control (Checkbox) Checkbox control and OptionButton Controls somewhat similar, but the use of a very different, CheckBox controls that work independently of each other, and they separated without the slightest relationship of checks and balances. All elected or not one can be elected. Each one is an independent, in which one or more optional. (3) Frame Controls Control framework is a very simple controls, Its mission is the Paleozoic body drawing a great sense of the three-dimensional framework, It is a common attribute caption attribute to show that the framework of the title. Frame Controls rarely used alone and it is always with other controls with the use. For example, we can in the TextBox, picture frames and an external add a framework to increase the three-dimensional effect, and so on. 3 Visual Basic6.0 Programming LanguageIn human social life, language is pronunciation, vocabulary and grammar constitute the system, person-to-person transmission of information, exchange ideas tool. Programming Language (also called algorithm language) is a word, phrase, and the rules of grammar constitute the directive system and the computer is a tool for the exchange. Use programming language, we only need to tell the computer when and under what conditions they do, computer will be in accordance with a request to implement a directive, and the implementation tell us the results. From the machinery of the implementation perspective, the programming language can be divided into two major categories: low level language and high-level language. Low level language is the machine-oriented instructions, different models of the CPU (Central Processing Unit, acronym for the CPU) have different instruction system. Low level language is divided into machine language and assembler language. Machine-language instructions contain only by the 0 and 1 binary symbols formed by certain laws, machines can be directly executed. These directives memory quite difficult, for people on the use of specific Mnemonic representatives machinery orders resulting in assembly language. Assembler language procedures require only a simple translation machines can be implemented. Low level language is characterized by faster procedures, high efficiency, but the programmer is required to understand the machine structure, Programming difficult for non-specialists to get involved. Senior language is easily accepted by the people; close to human language to describe the way constitute Instruction System. It need not machine-oriented, constitute simple, usually only one hundred scores of vocabulary, some of the rules that allow memory, and easy to learn. Programming speed. People say programming languages usually refers to high-level language. Senior language procedures require more complex compiler directives in order to become machines. In different applications often use different language design applications. Visual Basic6.0 language is a common senior programming language. Computer application areas is extensive, in order to meet different needs, programming language, often also the characteristics. For example, a system suitable for the preparation of the software, facilitate scientific computing, database management is good at. Suitable graphic design as well as dedicated to artificial intelligence, there are also some language also have multiple functions. From the application perspective, we can right programming language for the strict classification. Moreover, with the development of computer science and application of the rapid expansion of various language versions are constantly changing, function continuously update and enhance. Each period has a number of language in popular, there were a number of language in the disappearance. We should grasp programming language in nature, regularity of things. To meet specific needs, computer workers developed a variety of software tools. For example, word processing, spreadsheet, graphics, multimedia management, and systems management tools such as software. They are some special procedures for collection. User interface and interactive computer operation, which is called among the various subroutines. However, the world is complex and constantly changing, it will require the computer to do the work of diversity. We can say that the modern world of computer demand is endless. Computer manufacturers continue to produce more and more powerful and functional computer system Software developers have been designed to meet different needs of the application. But no matter how the structure of the computer, it has to do the work, it was always used as a form of a language with the computer exchange. From this idea of the computer system can be seen as a different level of linguistic composition system. People can use a different language and computer exchanges. If we use high-level language and computer exchange system to provide a translation tools, known as the compiler or interpreter, the first people to import computer instruction sequence translated into the machine language instruction sequence, then the computers logic circuits decomposed into Micros for the implementation of the various components corresponding action. Visual Basic6.0简介Visual Basic6.0,简称VB，是Microsoft公司推出的一种Windows应用程序开发工具。是当今世界上使用最广泛的编程语言之一，它也被公认为是编程效率最高的一种编程方法。无论是开发功能强大、性能可靠的商务软件，还是编写能处理实际问题的实用小程序，Visual Basic6.0都是最快速、最简便的方法。 何谓 Visual Basic6.0？“Visual”指的是采用可视化的开发图形用户界面（GUI）的方法，一般不需要编写大量代码去描述界面元素的外观和位置，而只要把需要的控件拖放到屏幕上的相应位置即可；“Basic”指的是BASIC语言，因为Visual Basic6.0是在原有的BASIC语言的基础上发展起来的，至今包含了数百条语句、函数及关键词，其中很多和 Windows GUI 有直接关系。专业人员可以用 Visual Basic6.0 实现其它任何 Windows 编程语言的功能，而初学者只要掌握几个关键词就可以建立实用的应用程序。 Visual Basic6.0提供了学习版、专业版和企业版，用以满足不同的开发需要。学习版使编程人员很容易地开发Windows和Windows NT的应用程序；专业版为专业编程人员提供了功能完备的开发工具；企业版允许专业人员以小组的形式来创建强健的分布式应用程序。1 Visual Basic6.0功能特点Visual Basic6.0是运行于Windows平台下的一种可视化的高级编程语言。自1991年问世以来，Visual Basic6.0适应了Windows3.x到Windows 95/98及Windows NT等各版本的操作系统的发展，广泛应用于普通窗口类、数据库管理类、网络数据通信类等应用程序的开发。Visual Basic6.0作为一种可视化的计算机的高级程序设计语言，有以下显著的特点：(1) Visual Basic6.0继承了Basic语言简单易学的特点 Microsoft在发展Visual Basic6.0过程中从来没有忘记其根源，编程的入门者即使是一个对计算机工作原理一窍不通的人，也可以在相当短的时间内编写一个可行的Windows程序。(2) 与基于Dos环境下的编程语言相比，Visual Basic6.0编程思想上发生了根本的改变与基于Dos环境下的编程语言相比，Visual Basic6.0编程思想上发生了根本的改变Visual Basic6.0中引入了面向对象的程序设计方法，使程序设计人员从烦琐的程序设计细节中解脱出来，程序设计人员在进行程序开发时，选择适当的对象构造自己需要的界面。然后安排好某对象接收到何消息做什么就可以了。而不需要具体地考虑对象如何做、哪个先做、哪个后做的问题。(3) Visual Basic6.0具有强大的数据库管理功能 Visual Basic6.0支持SQL数据库查询，利用Visual Basic6.0中嵌入的数据库管理功能几乎可以操纵各种格式的数据库。(4) 程序开发环境高度集成化 Visual Basic6.0是一个包括编辑、程序调试、程序运行、程序编译等各种功能的集成程序开发环境（IDE）(5) Visual Basic6.0适应于开发视窗类应用程序 Visual Basic6.0中包含大量的函数、命令及关键字，其中大部分与Windows图形用户界面相关，专业人员可以很方便地使用它们开发出功能强大的Windows应用程序。 2 Visual Basic6.0常用内部控件 选择控件可以分为复选框控件(CheckBox)和单选按钮控件(OptionButton)。CheckBox控件，在组中显示多项选择，这些选择提供了True、False或Yes、No选项，用户可选择其中的一项或多项；OptionButton控件，用户可以在组中单项选择。CheckBox和OptionButton控件功能相似，但二者之间也存在者重要差别：在同个组中，可同时选择多个CheckBox选项；但只能选择一个OptionButton选项。在Frame、PictureBox或者Form容器中使用这两种选择控件时，用户可以分组使用。 (1) 单选按钮控件(OptionButton) 在应用程序中，有时需要用户进行这样的选择：在几个选择项中只能选择其中的种，且必须选择一种，因为这几种情况是互相排斥的。这时，就需要使用OptionButton单选钮控件；图1就是一组单选钮控件，它只允许用户在其中选一种饮料，并且必须选种。单选钮控件总是以组的形式出现的。在一组控件中，总是只有一个单选钮处于选中状态；如果选中了其中的一个，其余单选钮则自动清除为非选中状态。(2) 复选框控件(CheckBox)CheckBox控件与OptionButton控件有些相似，但使用时有一个很大的不同，即CheckBox控件是彼此独立工作的，它们互不相干，没有丝毫的制约关系。全选上或者一个也不选都可以。每一个都是独立的，可以在其中任选一个或多个。(3) Frame框架控件Frame控件是一个非常简单的控件，它的任务只是在宙体中绘制一个很有立体感的框架，它的常用属性就是一个caption属性，用以显示框架的标题。Frame控件很少单独使用，它总是与其它的控件配合使用。比如，我们可以在文本框、图片框的外围加上一个框架来增加立体效果等等。3 Visual Basic6.0程序设计语言在人类社会生活中，“语言”是由语音、词汇和语法构成的系统，是人与人之间传递信息、交流思想的工具。而“程序设计语言”(也称算法语言)是由字、词和语法规则构成的指令系统，是人与计算机交流的工具。使用程序设计语言，我们只需要告诉计算机什么时候、什么条件下干什么，计算机就会按照要求一条一条地执行指令，并把执行结果告诉我们。从机器的执行角度来说，程序设计语言可以分成两大类：低级语言和高级语言。低级语言是面向机器的指令系统，不同型号的中央处理器(Central Processing Unit，缩写为CPU)有不同的指令系统。低级语言又分为机器语言和汇编语言。机器语言指令由只包含“0”和“1”的二进制符号按一定规律组成，能够被机器直接执行。这些指令记忆难度相当大，为此，人们就采用一些特定的助记符代表机器指令，从而产生了汇编语言。用汇编语言编写的程序只需要经过简单的翻译就可以被机器执行。低级语言的特点是程序执行速度快，效率高，但要求程序员了解机器的结构，程序设计难度大，非专业人员难以涉足。高级语言是由人们易于接受的、接近人类语言的描述方式构成的指令系统。它不需面向机器，构成简单，往往只有一百几十条词汇、若干条规则，便于记忆，易于学习，程序设计速度快。人们说的“程序设计语言”通常是指高级语言。高级语言编写的程序需要经过较复杂的编译才能成为机器指令。在不同的应用场合，往往使用不同的语言设计应用程序。Visual Basic6.0语言是一种通用的高级程序设计语言。计算机应用的领域很广泛，为了适应不同的需要，程序设计语言往往又各具特点。例如，有适于编写系统软件的，有便于进行科学计算的，有善于数据库管理的，有适合图形设计的，又有专用于人工智能的，也有一些语言同时具备多种功能。从应用角度，我们难以对程序设计语言作严格分类。而且，随着计算机科学的发展及应用领域的迅速扩展，各种语言版本都在不断地变化，功能在不断更新、增强。每个时期都有一批语言在流行，又有一批语言在消亡。我们应该掌握程序设计语言中本质性、规律性的东西。为了满足人们各种特定的需要，计算机工作者开发了各种工具软件。例如文字处理、表格处理、图形处理、多媒体管理以及各种系统管理工具等软件。它们是一些专用程序集。用户在界面上与计算机交互操作，就是调用它们之中的各个子程序。然而，世界是复杂的、千变万化的，人们要求计算机做的工作也千差万别。我们可以说，现代社会对计算机的要求是无止境的。计算机厂家不断生产功能越来越强大的计算机系统，软件开发者也不断设计满足不同需要的应用程序。但不管计算机结构如何，它要干什么工作，人们总是用某一种形式的“语言”与计算机交流。从这个思路出发，计算机系统可以看作是一个由不同层次语言构成的系统。人们可以用不同的语言与计算机交流。如果我们用高级语言与计算机交流，则系统提供一个翻译工具，称为编译程序或解释程序，先把人们输入计算机的指令序列翻译成机器语言的指令序列，然后由计算机的逻辑线路分解成微指令，让各部件执行相应的动作。Access2000 Relational DatabaseMembers of the Office family, the people of Access2000 understanding, often limited in its interface, for the database management function is still at the establishment table, data entry, Use Form guide Reporting Wizard, Data Access2000Page Wizard and other simple applications. In fact, the functions of the Access2000 is a powerful and beyond your imagination. It is released from Microsoft Access2000functions since most comprehensive, Windows and the Internet more closely with the database software, is a very powerful, and simple, easy-to-use database management system (DBMS) that the database storage, processing and management system. Access2000 relational database management system is Microsoft Office Public automation software as an integral part. It can effectively organize, manage and share the information in the database, and database information with the Web together. Through the Internet to share database information with the basic platform. With the development of information technology. Information technology platform is often the choice of establishing or re-establishing applications of the key issues, the database is part of the need to make a choice as a key platform. Access2000 as a relational database management system small and medium- sized information management system ideal development environment, the current database in the field, there are more and more people use. It is a powerful database management system MIS development tools. The database is stored together a collection of relevant data, the data is structured. The database is a data storage and data operation of the tool. The role of the database is to organize and present information, in short, the database is a collection of information. Computer database can be divided into two categories: non-relational database (flat-) and relational database (relational). Relational database contains a number of data tables, databases containing various parts of the terminology, like records. Relational database management system has the technological dominance of the mainstream, but this traditional database management systems by using two-dimensional data model, and there are inherent limitations and restrictions. It difficult to adapt to todays rapidly changing business needs, and the development of new technologies. With the rapid IT development, data processing, not only in quantity increasingly demanding, but also the quality of increasingly high demand, database management data has been a fundamental change. This change to the database technology has brought tremendous challenges, Object database management is no longer limited to text data and other simple data types. And the description and the need to preserve a lot of complex unstructured multimedia data, and the relationship between the data. Furthermore, in the wake of popular websites surge in the number of visits to its own database storage mechanism, a large number of concurrent users to the demand, storage efficiency in the use of space, and data integrity and security, and other aspects of higher demand. These are not traditional relational database, the use of a simple two-dimensional table structure of the meet. Access2000 is the relational database development tools, database pooling information for the inquiry, Storage and retrieval. Access2000 the advantage lies in its ability to use data map or custom windows to collect information. Data provides a map similar to the Excel spreadsheet, database transparent. In addition, the Access2000 allows creation of custom statements to print or export the information in the database. Access2000 also provides a data repository. Can use desktop database file to extend the database file at the network file server and other network users to share databases? Access2000 is a