Computer Programming Concepts and Visual Basic David I. Schneider

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394 Computer Programming Concepts and Visual Basic statement is needed because the LocationURL of the Web Browser control can easily return an error and crash the program. (For instance, this would happen if the intended web site was down.) After you run the program as specified in what follows, click on one of the links. Note: The home page of Internet Explorer will also be the home page of the Web Browser control. Object Property Setting frm14_2_1 Caption Simple Web Browser txtURL Text (blank) mdRetrieve Caption &Retrieve Document Default True CmdQuit Caption &Quit LblURL Caption URL: WebBrowser1 Private Sub Form_Load() WebBrowser1.GoHome ‘Calls up Internet Explorer’s home page End Sub Private Sub cmdRetrieve_Click() ‘Calls up the URL typed in the text box WebBrowser1.Navigate(txtURL.Text) End Sub Private Sub Form_Resize() ‘Resizes the WebBrowser control with the Form, ‘as long as the form is not minimized. ‘occurs when the Form is first displayed If frm14_2_1.WindowState > 1 Then WebBrowser1.Width = frm14_2_1.ScaleWidth WebBrowser1.Height = frm14_2_1.ScaleHeight – 740 ‘Subtract toolbar height End If End Sub Private Sub WebBrowser1_NavigateComplete (ByVal URL As String) ‘Is activated when the HTML control finishes retrieving the ‘requested Web page. ‘Updates the text box to display the URL of the current page. On Error Resume Next ‘Eliminates error messages txtURL.Text = WebBrowser1.LocationURL End Sub Private Sub cmdQuit_Click() End End Sub [Run. The Internet Explorer’s home page will be displayed. Type http://www.whitehouse.gov/ into the text box, and click on the “Retrieve Document” command button.]
EXAMPLE 2 The following enhancement of Example 1 adds a label that shows the status of the Web Browser control, a command button that returns you back to the most recently accessed page, and a command button that displays the Prentice-Hall web site. (The picture of the Prentice-Hall trademark is contained in the Pictures directory of the accompanying CD.) Add the following code to the program in Example 1. Accessing the Internet with Visual Basic 395 Object Property Setting frm14_2_2 Caption Simple Web Browser lblURL Caption URL: txtURL Text (blank) lblStatus Caption (blank) cmdRetrieve Caption &Retrieve Document Default cmdBack Caption &Back cmdPH Caption (none) Style Graphical Picture PHICON.BMP CmdQuit Caption &Quit WebBrowser1 Private Sub WebBrowser1_StatusTextChange(ByVal Text As String) ‘Event is called whenever the address of the page being ‘displayed changes. The address is assigned to the string Text. lblStatus.Caption = Text End Sub
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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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Page 353 and 354: 9. When all fields have been specif
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Page 365 and 366: Task Statement Assign a value to a
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Page 377 and 378: txtFinal.Text = “” picGrades.Pr
Page 379 and 380: ■ EVENTS In the previous section
Page 381 and 382: frmCircles.ForeColor = vbRed ‘Mak
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Page 385 and 386: End Sub Private Sub cmdDropBomb_Cli
Page 387 and 388: Next i End Sub Public Function Read
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Page 391: S E C T I O N 13 COMMUNICATING WITH
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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
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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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OR (Logical Operator) The logical e
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the same as in the original Dimensi
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SECOND The function Second extracts
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STRETCH When the Stretch property o
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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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