PROCEDURES in Visual Studio .NET

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PROCEDURES
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Object Label5 Text1 Text2 Text3 Text4 Command1 Command2 Command3
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Value Determine the Smallest of Three Numbers MS Sans Serif, 12-point (none) MS Sans Serif, 10-point (none) MS Sans Serif, 10-point (none) MS Sans Serif, 10-point (none) MS Sans Serif, 10-point Go MS Sans Serif, 10-point Clear MS Sans Serif, 10-point Quit MS Sans Serif, 10-point
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These assignments result in the Form Design Window shown in Fig. 7.6.
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Fig. 7.5
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Fig. 7.6
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Here are the corresponding procedures.
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Sub Smallest(ByVal a, ByVal b, ByRef c) If (a < b) Then c = a Else c = b End If End Sub
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PROCEDURES
Private Sub Command1_Click() Dim x, y, z, min x = Val(Text1.Text) y = Val(Text2.Text) z = Val(Text3.Text) Call Smallest(x, y, min) Call Smallest(z, min, min) Text4.Text = Str(min) End Sub Private Sub Command2_Click() Text1.Text = "" Text2.Text = "" Text3.Text = "" Text4.Text = "" End Sub Private Sub Command3_Click() End End Sub
Now suppose that we execute the program using the values a = 3, b = 4 and c = 2, as shown in Fig. 7.7. The first call to sub procedure Smallest from event procedure Command1 will transfer the values x = 3 and y = 4 to the procedure, returning the value 3, which will temporarily be assigned to min. (Note that the three input values are referred to as x, y and z within Command1, simply to illustrate the flexibility that is permitted when naming arguments.) The second call to Smallest will then transfer the values z = 2 and min = 3, returning the value 2, which will be assigned to min, replacing the earlier value. Clicking on the Go button produces the result shown in Fig. 7.8.
Fig. 7.7
Fig. 7.8
7.3 EVENT PROCEDURES Event procedures should be quite familiar by now, as we have been using them throughout this book. An event procedure is a special type of sub procedure. It is accessed by some specific action, such as clicking on an object, rather than by the Call statement or by referring to the procedure name. The particular action
PROCEDURES
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associated with each event procedure is selected from the upper-right drop-down menu within the Code Editor Window. The object name and the activating event collectively make up the event procedure name. Thus, Command1_Click(). is the name of an event procedure that is activated by clicking on command button Command1. Like any other sub procedure, arguments may be used to transfer information into an event procedure. An empty pair of parentheses must follow the procedure name if arguments are not present.
EXAMPLE 7.4 DEFINING AN EVENT PROCEDURE
Returning to the project presented in Example 7.3, suppose we double click on command button Command1 within the Form Design Window, as shown in Fig. 7.5. The Code Editor Window will then be displayed, as shown in Fig. 7.9.
Fig. 7.9
The object in this case is Command1 and the desired action is a mouse click, as indicated by the two menu selections at the top of Fig. 7.9. If a different action is desired, it can be selected by clicking on the down arrow in the upper right window and then selecting from the resulting menu, as shown in Fig. 7.10.
Fig. 7.10
Once the object and the action have been selected, the first and last lines of the event procedure are generated automatically within the Code Editor Window, as shown in Figs. 7.9 and 7.10. The user must then provide the remaining Visual Basic statements, thus completing the event procedure. The term Private appearing in the first line determines the scope of the event procedure; i.e., the portion of the program in which the event procedure is recognized. We will discuss this further later in this chapter (see Sec. 7.5).
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PROCEDURES
The complete event procedure Command1_Click(), originally shown in Example 7.3, is shown within the Code Editor Window in Fig. 7.11. The reader is again reminded that the indented statements are provided by the programmer. Note that this event procedure accesses the sub procedure Smallest twice.
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