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4.12 ASSIGNING PROPERTIES COLLECTIVELY (THE With BLOCK) When assigning values to several properties within the same object at run time, it is often convenient to do so using a With block. This construct allows the object name to be specified only once, followed by each of the property assignments. The use of With blocks is logically more concise than individual, independent property assignments. It may also be computationally more efficient, particularly if the property references involve several layers (e.g., form.object.property). The general form of the With block is
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With object name .property 1 = . . . . . .property 2 = . . . . . . . . . . .property n = . . . . . End With
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Note the period (.) preceding each property specification.
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EXAMPLE 4.10 ASSIGNING PROPERTIES USING WITH BLOCKS
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Let us again consider the Multilingual Hello program presented in Example 4.9. In this example we will assign only the form caption at design time. The remaining property values will be assigned using With blocks at run time, when the program execution begins. We begin with the form shown in Fig. 4.32, which is similar to Fig. 4.28 in Example 4.9.
Note that the form has been assigned a caption (Multilingual Hello 3), but the control objects have not been assigned specific property values. We now add a new event procedure (Form_Load) and modify the two existing event procedures (Combo1_Click and Command1_Click) as follows:
Private Sub Form_Load() With Label1 .Caption = "Say Hello, in . . ." .Font.Size = 10 End With With Combo1 .List(0) = "French" .List(1) = "German" .List(2) = "Hawaiian" .List(3) = "Hebrew" .List(4) = "Italian" .List(5) = "Japanese" .List(6) = "Spanish" .Text = "Language . . ." .Font.Size = 10 End With With Text1 .Text = "" .BackColor = &H8000000A 'Gray .BorderStyle = 0 .Font.Size = 14 End With (Continues on next page)
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With Command1 .Caption = "Quit" .Font.Size = 10 End With End Sub Private Sub Combo1_Click() With Text1 Select Case Combo1.ListIndex Case 0 .Text = "Bonjour" Case 1 .Text = "Guten Tag" Case 2 .Text = "Aloha" Case 3 .Text = "Shalom" Case 4 .Text = "Buon Giorno" Case 5 .Text = "Konichihua" Case 6 .Text = "Buenos Dias" End Select End With End Sub Private Sub Command1_Click() End End Sub
Note that the objects Label1, Combo1, Text1 and Command1 are assigned their initial property values within event procedure Form_Load. A separate With block is used for each object; hence, Form_Load contains four different With blocks. Note the embedded Select Case structure within the With block. The text within the text box control is then reassigned the proper string (the actual greeting) within Combo1_Click. This occurs at run time, when the user clicks on an entry within the combo box. Execution of the program results in the same behavior as shown in Example 4.9 (see Figs. 4.30 and 4.31).
4.13 GENERATING ERROR MESSAGES (THE MsgBox FUNCTION) Most comprehensive projects include error traps, which detect inappropriate input data or improper conditions that arise during the course of the computation. Some examples are detecting a negative value for an input parameter that is required to be positive, and trapping an attempt to calculate the square root of a negative number. Such conditions can usually be detected using If-Then or If-Then-Else. When an error of this type has been detected, an error message is usually displayed and the computation is either suspended or terminated. The error message informs the user that an error has occurred, and may suggest that the user take corrective action. The MsgBox function offers a convenient way to display error messages, as well as other types of information that may be useful during the course of the computation. This function is written as a single executable statement; i.e.,
MsgBox(string)
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