barcode print in asp net APPENDING A SEQUENTIAL DATA FILE: MORE DAILY TEMPERATURES in Visual Studio .NET

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EXAMPLE 9.5 APPENDING A SEQUENTIAL DATA FILE: MORE DAILY TEMPERATURES
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Let us modify the Visual Basic program created in the last example so that it can now append new information to an existing sequential text file as well as create a new text file. Hence, we will add a new menu item, Append, as shown in Fig. 9.21. The corresponding event procedure, mnuAppend_Click, is shown beneath Fig. 9.21. This event procedure is very similar to mnuNew_Click, presented in the last example. Now, however, we refer to the filename as OldFile rather than NewFile; we use the Open common dialog box to open the existing file, and we open it as an Append file rather than an output file.
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Fig. 9.20
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DATA FILES
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Fig. 9.21
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Private Sub mnuAppend_Click() Dim OldFile As String, Day As String Dim HiTemp As Single CommonDialog1.CancelError = True On Error GoTo CancelButton CommonDialog1.Filter = "Text file (*.txt) |*.txt" CommonDialog1.ShowOpen OldFile = CommonDialog1.FileName Open OldFile For Append As #1 Day = InputBox("Please enter the day of the week _ (type END when finished):", "Day") Do While UCase(Day) <> "END" HiTemp = Val(InputBox("Please enter the high temperature:", "High Temp")) Write #1, Day, HiTemp Day = InputBox("Please enter the day of the week _ (type END when finished):", "Day") Loop Close #1 CancelButton: Exit Sub End Sub
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Suppose we wish to append the following data to the file Daily Temperatures.txt, which was created in the last example. Day High Temperature, F Sunday 70 Monday 67 Tuesday 74 Wednesday 79 Thursday 83 Friday 86 Saturday 85 If we execute the program and select Append from the File menu (see Fig. 9.22), the Open menu appears. We then specify the filename Daily Temperatures.txt, as shown in Fig. 9.23.
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DATA FILES
Fig. 9.22
Fig. 9.23
This is followed by a series of input boxes, prompting for the day of the week and the corresponding high temperature, as shown in Example 9.4. At the conclusion of the data entry, the user must type End when prompted for the day of the week. Selecting Exit from the File menu then concludes the program execution. Once the program execution has been completed, the data file will appear as shown below.
"Sunday",77 "Monday",76 "Tuesday",81 "Wednesday",87 "Thursday",84 "Friday",79 "Saturday",74 "Sunday",70 "Monday",67 "Tuesday",74 "Wednesday",79 "Thursday",83 "Friday",86 "Saturday",85
DATA FILES
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In many applications, the information stored in a data file will be read and then processed by a Visual Basic program. The data items in a sequential data file must be read in the same order they are stored, starting at the beginning of the file. All of the information within the data file will be preserved in its original form for subsequent use.
EXAMPLE 9.6 PROCESSING A SEQUENTIAL DATA FILE: AVERAGING DAILY TEMPERATURES
In this example we present a Visual Basic program that will read the daily high temperatures from the sequential data file Daily Temperatures.txt and determine an average daily high temperature. We will read from the appended form of the data file, as shown in the preceding example. We begin with the preliminary control layout shown in Fig. 9.24. This is an extension of the control layout presented in Example 9.5, with the addition of a text box, an additional label, and two command buttons. The text box and its accompanying label (Label2) will display the average temperature. Command button Command1 will be used to read the data file and calculate the average, and command button Command2 will be used to end the computation. (Note that we are introducing some redundancy into the program, since the File menu also includes a menu item that will end the computation. Many commercial applications include such redundancy.) When the program is executed, the form will take on the appearance shown in Fig. 9.25.
Fig. 9.24
Fig. 9.25
The event procedures included in this program are shown below. Note that event procedures mnuNew_Click, mnuAppend_Click, and mnuExit_Click are identical to those presented in Examples 9.4 and 9.5. However, event procedure Form_Load has been modified from its earlier versions, and event procedures Command1_Click and Command2_Click are new.
Private Sub Form_Load() Form1.Caption = "Processing a Data File" Label1.Caption = "Daily Temperatures" Label1.FontSize = 12 Label1.Alignment = 2 'center text Label2.Caption = "Average High Temperature:" Label2.FontSize = 10 Text1.Text = "" Text1.FontSize = 10
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