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it contains.
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There is no way to decrease the size of an array without losing the data
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Part 2: Visual Basic for Applications
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You can store data in an array by specifying the index number of the element to which you want to assign the value. The following code fragments create an array to hold the names of the four major time zones within the continental United States and assign those names to the array:
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Option Base 1 Dim strUSTimeZones(4) as String strUSTimeZones(1) = "Eastern" strUSTimeZones(2) = "Central" strUSTimeZones(3) = "Mountain" strUSTimeZones(4) = "Pacific"
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Retrieving a value from an array works the same way: you specify the index number of the element you want to use. The following statement retrieves the fourth element from the third dimension of a two-dimensional array:
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intValue = intMyArray(3,4)
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Writing to the Screen and Accepting Input
Accepting input from users and providing status messages are common tasks that you ll use within many procedures. VBA lets you use two common Windows methods of displaying and asking for information from a user, which makes your macros easier to use because they present a familiar interface to the user.
Creating a Message Box
When small informational messages or simple questions need to be asked, the MsgBox (mes sage box) function can be used. Message boxes are useful for a number of reasons. Besides being familiar aspects of just about any Windows application, they are extremely simple and easy to use. Here is a list of some common tasks for which you can use message boxes.
Inform the user of an action that is about to take place, and possibly allow them the
option to cancel the action or choose a different action.
Inform the user of an error condition that has occurred, and allow them to take correc
tive actions.
Inform the user that a particular task has been completed successfully or not. The
message box can inform the user exactly what was done to perform the task. A primary advantage of using a message box is that it lets you present a message to the user that can t be ignored. It s even possible to force the user to react to the message box by not allowing them to switch to or open any other application. As useful as message boxes are, they do have several limitations, such as the following:
A message box can present only one, two, or three buttons for users to choose from,
4
which means a limited number of options for the user.
The buttons are available only in predefined sets you can t place a custom button into
a message box.
No other features are available in a message box. You can t add additional controls to
present more information/options to a user. Despite these limitations, the message box is a very handy tool for any programmer. The syn tax of a message box statement is shown here.
MsgBox(prompt[, buttons] [, title][, helpfile, context]) as Integer
prompt
A required argument for the MsgBox function that contains the text that is displayed within the message box. The text can be no longer than about 1024 charac ters, depending upon the width of the characters. If the text contains multiple lines, you can specify the line breaks by including a carriage return with the constant vbCr, (Chr$(13)), linefeed with the vbLf constant, (Chr$(10)), or carriage return/linefeed combination with the vbCrLf constant.
Part 2: Visual Basic for Applications
Microsoft Office Excel 2003 Programming Inside Out Note While it s easier to use the intrinsic constants for a carriage return and a line feed, you might see (Chr$(13)) for a carriage return, (Chr$(10)) for a line feed, and (Chr$(13) & Chr$(10)) for both.
buttons
Optional numerical argument used to specify the buttons and the icon that is to be displayed within the message box. By adding the value of the selected options together, you can specify not only which buttons and icon to display, but also which button is the default button and the modality of the message box. You can use the Visual Basic intrinsic constants to specify options. See Table 4-9 for a complete list of options available. The default button is selected if the user presses the Enter key. If buttons is not given, the default value of 0 is used. Optional string argument used to specify the text to be displayed within the message boxes title bar. If omitted, Microsoft Office Excel is displayed. Optional string argument used to specify the help file used to provide context-sensitive help. If helpfile is specified, context must also be specified. Optional numerical argument that is the Help context number assigned to the appropriate Help topic. If context is provided, helpfile must also be provided.
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