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Fig. 5.34(a)
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Private Sub Command1_Click() Dim CustomerName As String, L1 As String, L2 As String Dim AcctNo As Integer, Verify As Integer L1 = "Customer Name: " L2 = "Account Number: " Do Label1 = L1 Label2 = L2
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Fig. 5.34(b)
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CustomerName = InputBox("Please enter your name:", "Customer Name") Label1 = L1 & CustomerName AcctNo = Val(InputBox("Please enter your account number:", "Account Number")) Label2 = L2 & Str(AcctNo) 'Process the account Verify = MsgBox("Is this correct ", 3, "Verify") Loop While Verify = 7 If Verify = 2 Then Label1 = L1 Label2 = L2 End If End Sub Private Sub Command2_Click() End End Sub
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When the program is executed the string variables L1 and L2 are assigned the labels Customer Name: and Account Number:, which will later be concatenated with the actual customer name and account number. The program then enters a loop, which will be terminated by an OK or Cancel response from a message box similar to the one in Example 5.8. Within the loop, an input box is first generated for the customer name. The resulting string, represented by the string variable CustomerName, is then concatenated with L1 to form a complete label for Label1. This process is then repeated for the account number, providing a string which is concatenated with L2 to form a complete label for Label2. Note that the account number is converted to an integer after being entered through the input box. This permits the account number to be used in any numerical calculations, which are not included within this example (the single remark Process the account refers to the unspecified computational commands.) The numerical account number is then converted back to a string when it is added to Label2.
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Each input box allows the user to either accept or reject the string entered. The Cancel feature will most likely not be needed, however, since the user may backspace, etc. to correct the input information before pressing the Enter key. However, if the user should press Cancel rather than OK, an empty string will be returned and included in Label1 or Label2.
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Fig. 5.35(a)
Fig. 5.35(b)
Finally, a message box is generated which allows the user to verify that both input items are correct. We have already discussed the details of this type of dialog box (see Example 5.8). The program execution begins by displaying the primary form, as shown in Fig. 5.33(a). When the user presses the Go button, the input box shown in Fig. 5.35(a) appears. The user then enters his/her customer name, as shown in Fig 5.35(b), and then presses the OK or the Cancel button. The second input box then appears, requesting the user s account number, as shown in Fig. 5.36.
Fig. 5.36
Once the user enters the account number and clicks on the OK button, a message box is displayed, as shown in Fig. 5.37. Clicking on the Yes button then causes the final version of the primary form to appear, as shown in Fig. 5.33(b). If the user clicks on the No button, the program responds by again displaying the dialog boxes requesting the customer name and the account number. If the user selects Cancel, the primary form is returned to its original state.
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Fig. 5.37 In addition to the features described above, the screen location of the input box can be specified with additional argument values. Also, an input box, like a message box, can be associated with online help. See Visual Basic s online help for more information about these features.
Review Questions
5.1 5.2 5.3 5.4 5.5 5.6 5.7 What is the difference between a drop-down menu and a pop-up menu What is the purpose of the Menu Editor How is the Menu Editor accessed Within the Menu Editor, what is the purpose of the Enabled check box Within the Menu Editor, what is the purpose of the Visible check box Within the Menu Editor, what is the difference between the Caption and the Name Are they both required Describe the order in which the various menu items are entered into the Menu Editor. Within the Menu Editor, what is the reason for indentation within the list of menu items How is this indentation carried out How is it reversed How is a menu item inserted into the Menu Editor s list of menu items How is a menu item deleted How is the relative location of a menu item changed What is a keyboard access character How is an access character associated with a menu item
5.10 Can two menu items within the same menu have the same keyboard access character 5.11 Can a menu item within one menu have the same keyboard access character as a menu item within another menu 5.12 What is a keyboard shortcut How do keyboard shortcuts differ from keyboard access characters How is a keyboard shortcut associated with a menu item (Compare with Question 5.9.) 5.13 Can a menu item within one menu have the same keyboard shortcut as a menu item within another menu (Compare with Question 5.11.) 5.14 What is indicated by a check mark shown next to a menu item How is a check mark displayed initially How is a check mark later added or removed, during program execution 5.15 How is a menu item initially deactivated How is a menu item later activated or deactivated, during program execution
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