Computer Programming Concepts and Visual Basic David I. Schneider

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402 Computer Programming Concepts and Visual Basic COMMENTS 1. You can obtain extensive information about HTML and VBScript from the Help menu in the ActiveX Control Pad. (If the documentation for VBScript is not present on your computer, you can either download the documentation or read it online at http://microsoft.com/scripting.) 2. HTML tags are not case sensitive. For instance, has the same effect as . 3. A TITLE element must placed inside the HEAD portion of an HTML document. 4. VBScript programs can contain code that is not in any procedure. If so, this code is executed by Internet Explorer as soon as the Web page is displayed. It is analogous to Visual Basic code found in the Form_Load event procedure. 5. Some features of Visual Basic that are not available in VBScript are ranges of values and the Is keyword in Case clauses, Str and Val functions, the Open statement, On Error GoTo statement, arrays declared with lower bound ≠ 0, line labels, collections, and picture box controls. 6. If i is the index of a For...Next loop, in Visual Basic the final statement should be Next i. In VBScript, the i must be dropped from the final statement. 7. To download the ActiveX Control Pad, enter the address http://www.microsoft.com/gallery/tools/contents.htm into your browser and follow the directions. 8. You can place your own custom-built ActiveX controls into an HTML document provided the control has been compiled into an ocx file. However, in order to use these controls you will have to ease Internet Explorer's safety level. To invoke the lowest level of security, select Internet Options from Internet Explorer's View menu, click on the Security tab, and select Low. Note: Before you actually connect to the internet, reset the safety level to High. 9. Visual Basic allows you to place controls exactly where you want on a form. The ActiveX Control Pad has a device, called an HTML Layout, that lets you achieve the same result. An HTML Layout is actually an ActiveX control that acts as a container for other controls. It has a grid like a form that allow for precision alignment. The steps for creating an HTML Layout are as follows. (a) From the ActiveX Control Pad, click on New HTML Layout in the File menu. (A form-like window and a square toolbar containing about a dozen icons will appear.) (b) Place a control on the Layout with the click and drag method. To set the properties of a control in the Layout, double-click on the control to produce a Properties window. (c) After all the controls have been drawn and their properties set, save the Layout (in an ALX file). (d) To insert the Layout into an HTML document, position the cursor at the insertion point, and click on Insert HTML Layout in the Edit menu to open a file-selection dialog box. Select the location and name of the file, and then press the Open button. (An OBJECT element will be created for the Layout.) (e) Whenever you want to alter the Layout, place the cursor anywhere inside the OBJECT element and select Edit HTML Layout from the Edit menu.
SUMMARY 1. OLE, a technology developed by Microsoft, gives Visual Basic access to other applications. 2. OLE Automation allows you to control other applications with Visual Basic code. The other application is declared as an object with the Set statement and CreateObject function. 3. Other applications can be embedded in or linked to a form with the OLE Container control. 4. The WebBrowser control can be used to create a browser for the World Wide Web. 5. The document-formatting language used by Web browsers is called HTML. Tags are used to mark up text with display instructions. The combination of a pair of tags and the text enclosed is called an element. 6. The ActiveX Control Pad is used to place text, controls, and programs into HTML documents. 7. VBScript is a subset of Visual Basic that is used to make Web pages interactive. Summary 403
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Computer Programming Concepts and V
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CONTENTS SECTION 1: PROBLEM SOLVING
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13.3 WEB PAGE PROGRAMMING WITH VBSC
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S E C T I O N 1 PROBLEM SOLVING
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4 Computer Programming Concepts and
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10 Computer Programming Concepts an
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S E C T I O N 2 FUNDAMENTALS OF PRO
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3.1 SUB PROCEDURES, PART I Structur
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The second task performed by the ad
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‘The density (number of people pe
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"Hawaii", 1184000, 6471 "Alaska", 6
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dure by just using the variable in
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Call CalculateSum(x, y, s) Call Dis
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■ FORM-LEVEL VARIABLES Visual Bas
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3. In Appendix D, the section “St
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Private Sub cmdDetermine_Click() Di
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Private Sub cmdCompute_Click() Dim
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preceded with the word ByVal. Built
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It is clear from the hierarchy char
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The meaningful procedure names, alo
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FIGURE 3-9 Sample Run for Programmi
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4.1 RELATIONAL AND LOGICAL OPERATOR
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(a) (2 < n) And (n < 6) (b) (2 < n)
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SOLUTION: In the following program,
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The Else part of an If block can be
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picTax.Cls picTax.Print “Your FIC
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Case 4, 5 picOutcome.Print “You a
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EXAMPLE 3 The following program use
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Case Else picResult.Print “The st
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4. The items in the value list must
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The hierarchy chart in Figure 4-4 s
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‘Program to compute employees’
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Private Function TaxMarried(adjPay
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and tells us whether the food meets
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S E C T I O N 5 REPETITION
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132 Computer Programming Concepts a
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S E C T I O N 6 ARRAYS
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S E C T I O N 7 SEQUENTIAL FILES
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S E C T I O N 8 RANDOM-ACCESS FILES
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S E C T I O N 9 THE GRAPHICAL DISPL
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10.1 LIST BOXES AND COMBO BOXES The
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Private Sub cmdAdd_Click() Dim item
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either typing in information or jus
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Private Sub cmdDisplay_Click() picF
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clicks on the square to toggle betw
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circle and the button is said to be
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hsbBar.Value changes accordingly. T
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THE SHAPE CONTROL The shape control
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FIGURE 10-9 A Picture Created with
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Rows 9 ScrollBars 0 - flexScrollBar
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Private Sub cmdQuit_Click() End End
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Here, the menu bar contains two men
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Clipboard.Clear deletes the content
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cedures that are available to all f
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The Flags property influences certa
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13. Additional forms serve as new w
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6. Voting Machine. The members of t
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11.1 AN INTRODUCTION TO DATABASES T
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9. Click on the down arrow to the r
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clicked or a Move, Update, Delete,
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Do While (Not foundFlag) And (Not d
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mary key. Databases of student enro
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question mark stands for a single c
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1995 populations. When the second c
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If a Find method does not locate a
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place an x in the check box next to
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population (in descending order). W
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Creating and Designing Databases 34
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9. When all fields have been specif
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Creating and Designing Databases 34
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TABLE 11.5(B) TABLE 11.5(C) course
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Page 377 and 378: txtFinal.Text = “” picGrades.Pr
Page 379 and 380: ■ EVENTS In the previous section
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Page 413: A P P E N D I C E S
Page 431 and 432: APPENDIX C VISUAL BASIC STATEMENTS,
Page 433 and 434: CANCEL The Cancel property provides
Page 435 and 436: COLS and ROWS The Cols and Rows pro
Page 437 and 438: DEFINT, DEFLNG, DEFSNG, DEFDBL, DEF
Page 439 and 440: ENVIRON Visual Basic has an environ
Page 441 and 442: FONT.ITALIC or FONTITALIC These pro
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Page 447 and 448: ISNUMERIC The value of the function
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Page 457 and 458: SECOND The function Second extracts
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UNLOCK The Unlock command is intend
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[COLOR]: Numbers written in base 16
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Appendix D 457
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466 Technology of the Internet D Da
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468 Technology of the Internet Rela
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470 Technology of the Internet 2. D
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SYSTEM REQUIREMENTS CD-ROM INSTRUCT
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Computer Programming Concepts and Visual Basic David I. Schneider

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