Visual Basic.NET How to Program (PDF)

Chapter 17 Files and Streams 769
67 txtFirstName.Text = values(TextBoxIndices.FIRST)
68 txtLastName.Text = values(TextBoxIndices.LAST)
69 txtBalance.Text = values(TextBoxIndices.BALANCE)
70 End If
71
72 End Sub ' SetTextBoxValues
73
74 ' return TextBox values as String array
75 Public Function GetTextBoxValues() As String()
76
77 Dim values(TextBoxCount) As String
78
79 ' copy TextBox fields to String array
80 values(TextBoxIndices.ACCOUNT) = txtAccount.Text
81 values(TextBoxIndices.FIRST) = txtFirstName.Text
82 values(TextBoxIndices.LAST) = txtLastName.Text
83 values(TextBoxIndices.BALANCE) = txtBalance.Text
84
85 Return values
86 End Function ' GetTextBoxValues
87
88 End Class ' FrmBankUI
Fig. 17.7 FrmBankUI class is the base class for GUIs in our file-processing
applications (part 3 of 3).
To reuse class FrmBankUI, we compile the GUI into a DLL library by creating a
project of type Windows Control Library (the DLL we create is called BankLibrary).
This library, as well as all the code in this book, can be found on the CD accompanying
this book and at our Web site, www.deitel.com. However, students might
need to change the reference to this library, as it most likely resides in a different location
on their systems.
Figure 17.8 contains the CRecord class that the programs of Fig. 17.9, Fig. 17.11 and
Fig. 17.12 use for reading records from, and writing records to, a file sequentially. This
class also belongs to the BankLibrary DLL, which means that it is located in the same
project as is class FrmBankUI. (When students add class CRecord to the project containing
FrmBankUI, they must remember to rebuild the project.)