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Private Sub mnuExit_Click() End End Sub Private Dim Dim Dim Dim Sub Command1_Click() OldFile As String, Day As String i As Integer, n As Integer HiTemp As Single, LoTemp As Single HiSum As Single, LoSum As Single
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CommonDialog1.CancelError = True On Error GoTo CancelButton CommonDialog1.Filter = "Text file (*.txt) |*.txt" CommonDialog1.ShowOpen OldFile = CommonDialog1.FileName Open OldFile For Input As #1 i = 0 'loop counter HiSum = 0 LoSum = 0 Do Until EOF(1) Input #1, Day, HiTemp, LoTemp HiSum = HiSum + HiTemp LoSum = LoSum + LoTemp i = i + 1 n = i 'number of items read from data file Loop Text1.Text = Format(HiSum / n, "##.#") Text2.Text = Format(LoSum / n, "##.#") Close #1 CancelButton: Exit Sub End Sub Private Sub Command2_Click() End End Sub
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Event procedures mnuNew_Click, mnuAppend_Click, mnuExit_Click and Command2_Click are unchanged from the previous examples. Procedure Form_Load includes some additional property assignments to accommodate the new controls. Event procedure mnuModify_Click is new. It opens both an existing sequential data file (the input file) and a new sequential data file (the output file). The loop reads information from the old data file, adds new information entered from the input box, and then writes the combined information to the new data file. This process proceeds on a line-by-line basis, until an end-of-file condition is encountered on the old data file. In addition, event procedure Command1_Click has been modified to calculate two averages one for the daily high temperatures, and the other for the daily low temperatures. This event procedure first opens a designated data file as an input file, and then reads all of the data on a line-by-line basis. A Do Until loop is used for this purpose. Once the looping action has been concluded, the averages are computed, formatted, and assigned to the appropriate text boxes. Note that the Modify feature could have been initiated from a new control button rather than an additional File menu entry. Similarly, the calculation of the averages could have been initiated from a menu entry rather than a control button. The use of both types of controls in this example was intended to illustrate the mechanics of each control type. Now let us turn our attention to the program execution. Figs. 9.30 and 9.31 show the opening user interface and the entries within the File menu. If we then select Modify from the File menu, we see the Open dialog box shown in Fig. 9.32.
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Fig. 9.32
Fig. 9.33
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Once an existing text file has been selected within the Open dialog box, the Save As dialog box appears, prompting for the name of the new text file, as shown in Fig. 9.33. Note that we have selected the existing text file Daily Temperatures.txt from the Open dialog box (Fig. 9.32), and the new text file name New Daily Temperatures.txt within the Save As dialog box (Fig. 9.33). A series of input boxes will then appear, each prompting for a daily low temperature. The first two input boxes are shown in Figs. 9.34(a) and 9.34(b). A total of 14 such input boxes will appear, one for each line of text within data file Daily Temperatures.txt.
Fig. 9.34(a)
Fig. 9.34(b)
Upon completion of this process, we will have generated the data file New Daily Temperatures.txt, whose contents are shown below.
"Sunday",77,61 "Monday",76,63 "Tuesday",81,64 "Wednesday",87,71 "Thursday",84,68 "Friday",79,65 "Saturday",74,62 "Sunday",70,58 "Monday",67,55 "Tuesday",74,61 "Wednesday",79,66 "Thursday",83,70 "Friday",86,72 "Saturday",85,70
We now press the Calculate button, which again displays the Open dialog box, as shown in Fig. 9.35. We must then select an existing text file from the Open dialog box. The file selected must be a modified data file, containing both high and low temperatures for each day. Fig. 9.35 shows that we have selected the recently created data file New Daily Temperatures.txt.
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