QTP code -Loop Basics

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Some basic information about various loop types.

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' Loops allow you to run a group of statements repeatidly.

'
' There are four types of loop available, all very easy to 
' use and understand. This code sample will explain how
' to use each type of loop.
'

' Do...Loop

' The Do...Loop will run a block of statements repeatidly 
' while a condition is True, or until a condition becomes True

' Check these two examples of Do...While, there is one major difference 
' between them. In Example A the cose will check the value of intCounter
' before it enters the loop, but in Example B the code will enter the 
' loop regardless of the value of intCounter.

' Example A
intCounter = 0
Do While intCounter < 5
    intCounter = intCounter + 1
    MsgBox intCounter
Loop

' Example B
intCounter = 0
Do
    intCounter = intCounter + 1
    MsgBox intCounter 
Loop While intCounter <5

' Here is the same examples using the Do...Until
' Example A
intCounter = 0
Do Until intCounter = 6
    intCounter = intCounter + 1
    MsgBox intCounter
Loop

' Example B
intCounter = 0
Do
    intCounter = intCounter + 1
    MsgBox intCounter 
Loop Until intCounter = 6

' For...Next

' For...Next Loops will execute a series of statements until a specific counter value 
' is reached.
For iCounter = 1 To 5
    MsgBox iCounter
Next

' You can add a Step keyword to define how much the counter should increase with each
' itteration of the loop
For iCounter = 1 To 10 Step 2
    MsgBox iCounter
Next 

' The Step keyword can also be used to itterate backwards
For iCounter = 5 to 1 Step -1
    MsgBox iCounter
Next 


' For...Each

' Another variation on the For...Next loop is the For...Each loop. The For...Each
' loop is used to execute a series of statements for each object in a collection, 
' i.e. each element of an array. For example...
Dim strPeopleList
Dim strPerson
strPeopleList = Array("Alan", "Bob", "Craig", "Dan")
For Each strPerson in strPeopleList
    MsgBox strPerson
Next


' While...Wend Loops
'
' This type of loop will execute a series of statements as long as 
' a given condition is true.
' Note: It's advisable to avoid using this type of loop, you should
' us the Do...Loop instead
' Here's an example anyway...
iCounter = 0
While iCounter < 5
    iCounter = iCounter + 1
    Msgbox iCounter
Wend

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