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EXAMPLE 9.7 MODIFYING A SEQUENTIAL DATA FILE: RECORDING DAILY HIGH AND LOW TEMPERATURES
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Let us now alter the Visual Basic program presented in Example 9.6 so that new information can be added to each line of a sequential data file. To do so, we will read a line of information from an existing data file, enter additional information from the keyboard via an input box, and then write everything out to a new data file. This process will continue on a lineby-line basis, until the entire original data file has been modified. (Note the distinction between adding new information to each line of a data file, and appending information to the end of a data file, as we did in Example 9.5.) In particular, suppose we want to add a daily low temperature to each of the daily high temperatures in the data file Daily Temperatures.txt shown in Example 9.5. Recall that this file contains only the day of the week and the corresponding high temperatures. Therefore, for each line in Daily Temperatures.txt, we will carry out the following steps. 1. 2. 3. Read the day of the week and the daily high temperature. Enter a corresponding daily low temperature from the keyboard. Write the day of the week, the daily high temperature, and the daily low temperature to a new data file, with the file name New Daily Temperatures.txt.
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[CHAP. 9
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Here are the low temperatures corresponding to the high temperatures recorded in New Daily Temperatures.txt. Day Low Temperature, F Sunday 61 Monday 63 Tuesday 64 Wednesday 71 Thursday 68 Friday 65 Saturday 62 Sunday 58 Monday 55 Tuesday 61 Wednesday 66 Thursday 70 Friday 72 Saturday 70 We begin with the preliminary control layout shown in Fig. 9.28. Notice that we have added an additional text box and an accompanying label, compared with the layout shown in the previous example. Also, the File menu now contains a new entry, called Modify, as shown in Fig. 9.29. This new menu entry will initiate the desired data file modification.
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Fig. 9.28
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Here are the corresponding menu editor entries. Caption
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File ....&New ........&Append &Modify ....&Exit
Fig. 9.29
Name
mnuFile mnuNew mnuSep1 mnuAppend mnuSep2 mnuModify mnuSep3 mnuExit
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DATA FILES
The corresponding event procedures are shown below.
Private Sub Form_Load() Form1.Caption = "Modifying a Data File" Label1.Caption = "Daily Temperatures" Label1.FontSize = 12 Label1.Alignment = 2 'center text Label2.Caption = "Average High Temperature:" Label2.FontSize = 10 Label3.Caption = "Average Low Temperature:" Label3.FontSize = 10 Text1.Text = "" Text1.FontSize = 10 Text2.Text = "" Text2.FontSize = 10 Command1.Caption = "Calculate" Command1.FontSize = 10 Command2.Caption = "Exit" Command2.FontSize = 10 End Sub
Private Sub mnuNew_Click() Dim NewFile As String, Day As String Dim HiTemp As Single CommonDialog1.CancelError = True On Error GoTo CancelButton CommonDialog1.Filter = "Text file (*.txt) |*.txt" CommonDialog1.ShowSave NewFile = CommonDialog1.FileName Open NewFile For Output 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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DATA FILES
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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 Private Dim Dim Dim Sub mnuModify_Click() OldFile As String, NewFile As String, Day As String Message As String HiTemp As Single, LoTemp As Single
CommonDialog1.CancelError = True On Error GoTo CancelButton CommonDialog1.Filter = "Text file (*.txt) |*.txt" CommonDialog1.ShowOpen OldFile = CommonDialog1.FileName Open OldFile For Input As #1 CommonDialog1.ShowSave NewFile = CommonDialog1.FileName Open NewFile For Output As #2 Do Until EOF(1) Input #1, Day, HiTemp Message = "Please enter " & Day & "'s low temperature:" LoTemp = Val(InputBox(Message, "Low Temp")) Write #2, Day, HiTemp, LoTemp Loop Close #1 Close #2 CancelButton: Exit Sub End Sub
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