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Private Sub Command3_Click() Close #1 End End Sub
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Sub Search(Target As String) State As StateRecord RecordNumber As Integer, First As Integer, Last As Integer Current As String
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First = 1 Last = LOF(1) / Len(State) Do 'binary search routine RecordNumber = Int((First + Last) / 2) Get #1, RecordNumber, State Current = UCase(Left(State.Name, Len(Target))) If (Current = Target) Then 'found the target state Label3.Enabled = True Text2.Enabled = True Text2.Text = State.Capital Exit Do ElseIf (Current > Target) Then 'retain first half of search interval Last = RecordNumber - 1 If (Last < First) Then Last = First Else 'retain last half of search interval First = RecordNumber + 1 End If
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If (First = Last) Then 'try the remaining end point RecordNumber = First Get #1, RecordNumber, State Current = UCase(Left(State.Name, Len(Target))) If (Current = Target) Then Label3.Enabled = True Text2.Enabled = True Text2.Text = State.Capital Else MsgBox ("Cannot find this state - please try again") End If End If Loop Until (First = Last) End Sub
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The event procedures are similar to those presented in earlier examples, and require little additional explanation. Note, however, that within event procedure Command1_Click, the name of the state, originally entered in text box Text1 by the user, is converted to uppercase and then assigned to the string variable Target. Target is then passed to sub procedure Search, where the binary search process outlined earlier is actually carried out. Also, notice that the access to the Open dialog box is controlled by the value assigned to property Label1.Tag. Initially, Label1.Tag is assigned a value of 0, within event procedure FormLoad. This allows the Open dialog box to be accessed within Command1_Click. Once the Open dialog box is accessed, however, Label1.Tag is reassigned the value 1, thus preventing any further (and unnecessary) reference to the Open dialog box.
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When the program is first executed, the user must enter the name of a state, as shown in Fig. 9.49. Clicking on the
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Find button causes the Open dialog box to appear, as shown in Fig. 9.50. (Note that the data file States.dat is selected in Fig. 9.50.) The Open dialog box appears only at the beginning of the first search. It is not required for subsequent searches, since it is assumed that all subsequent searches will be carried out within the same data file (States.dat).
Fig. 9.49
Fig. 9.50
Fig. 9.51
Fig. 9.52
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Once a state has been specified and a data file has been selected, the corresponding state capital appears in the lower text box, as shown in Fig. 9.51. Thus, we see that the capital of Ohio is Columbus. The search procedure may be carried out repeatedly by clicking on the Clear button, entering the name of a new state, and again clicking on the Find button. The user need not enter the entire name of the state. Only the first few letters are required enough to uniquely identify the state. Thus, Fig. 9.52 shows the capital Sacramento in response to the abbreviated name Cal, which uniquely identifies California. (Note that ambiguous abbreviations, such as Ala, Miss, or New, cannot be used.) Now suppose the user enters a string that cannot be identified as a part of a state name, as shown in Fig. 9.53 (NY is not an acceptable abbreviation for New York). Then the binary search process will be unable to locate a matching record. Hence, an error message will appear within a message box, as shown in Fig. 9.54.
Fig. 9.53
Fig. 9.54
Since this example deals with a relatively small data file, it would have been easier to copy the file contents into arrays and then locate the desired state by scrolling through a list box or a combo box. The corresponding state capital could then easily be located and displayed. This method works well when the resulting arrays do not consume an inordinate amount of memory. If the data file were very large, however (i.e., if it contained thousands of records), the resulting arrays would most likely be too large to store in the computer s memory. In such situations, the use of the binary search procedure is a much better strategy.
Random access data files are well-suited for applications that require periodic record updates, because information can be read from and written to the same data file. (Recall that a sequential data file can be opened in an input mode or an output mode, but not both). Thus, for any given record, old information can be read from a random access data file and displayed on the screen. Updated information can then be entered from the keyboard and written to the data file. This procedure can be repeated for all of the records in the file, or for a selective number of records that specifically require updating. The procedure is illustrated in the following example.
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