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You can write the same script by using Windows PowerShell . In the DemoDoUntil .ps1 script, you first set the value of the $i variable to 0 . You then create an array with the numbers 1 through 5 in it . You store that array in the $ary variable . You then arrive at the do loop (do-until) construction . After the do keyword, you open a set of braces (curly brackets) . Inside the curly brackets, you use the $i variable to index into the $ary array and to retrieve the value that is stored in the first element (element 0) of the array . You then increment the value

of the $i variable by 1 . You continue to loop through the elements in the array until the value of the $i variable is equal to 5 . At that time, you end the script . This script resembles the DemoDoWhile .ps1 script examined in the previous section .

21

DemoDoUntil.ps1 $i = 0 $ary = 1..5 Do { $ary[$i] $i ++ } Until ($i -eq 5)

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In VBScript, if a Do While Loop condition is never true, the code inside the loop never executes . In Windows PowerShell, the do while and the do until constructions always run at least once . This can be unexpected behavior, and it is something that you should focus on . This is illustrated in the DoWhileAlwaysRuns .ps1 script . The script assigns the value of 1 to the variable $i . Inside the script block for the do while loop, you print out a message that states you are inside the do loop . The loop condition is while the variable $i is equal to 5 . As you can see, the value of the $i variable is 1 . Therefore, the value of the $i variable will never reach 5 because you are not incrementing it . The DoWhileAlwaysRuns .ps1 script is seen here .

DoWhileAlwaysRuns.ps1 $i = 1 Do { "inside the do loop" } While ($i -eq 5)

Sub RunCharMap() Dim TaskID As Long Dim hProc As Long Dim lExitCode As Long ACESS_TYPE = &H400 STILL_ACTIVE = &H103 Program = "Charmap.exe" On Error Resume Next TaskID = Shell(Program, vbNormalFocus) hProc = OpenProcess(ACCESS_TYPE, False, TaskID) If Err <> 0 Then MsgBox "Unable to start " & Program, vbCritical, "Error" Exit Sub End If Do GetExitCodeProcess hProc, lExitCode DoEvents Loop While lExitCode = STILL_ACTIVE MsgBox Program & " is no longer the active application" End Sub

When you run the script, the text inside the do loop is printed out once . This is seen in Figure 13-29 .

What about a similar script that uses the do until construction The EndlessDoUntil .ps1 script is the same script as the DoWhileAlwaysRuns .ps1 script except for one small detail . Instead of using do while, you are using do until. The rest of the script is the same . The value of the $i variable is equal to 1, and in the script block for the do until loop, you print the string "inside the do loop ." This line of code should execute once for each do loop until the value of $i is equal to 5 . Because the value of $i is never increased to 5, the script will continue to run . The EndlessDoUntil .ps1 script is shown here .

While the launched program is active, the procedure continues to loop until the lExitCode returns a different value. When the loop ends, the VBA code will resume.

EndlessDoUntil.ps1 $i = 1 Do { "inside the do loop" } Until ($i -eq 5)

Before you run the EndlessDoUntil .ps1 script, you should know how to interrupt the running of the script: You hold down the Ctrl key and press C (Ctrl+C) . This was the same keystroke sequence that would break a runaway VBScript that was run in Cscript . The results of running the EndlessDoUntil .ps1 script are seen in Figure 13-30 .

You might be wondering what steps to take if the application you want to use is already open. Using the Shell function would create a second instance of the program taking up valuable memory. In most cases, you should activate the program that s running, rather than creating a new instance of the program. Consider the following example, in which the ActivateCalculator procedure uses the AppActivate statement to activate the application if the application is already running. The argument for the AppActivate statement is the caption of the application s title bar. If the AppActivate statement generates an error, it means the Calculator isn t running, so the procedure will start the application.

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