Friday, 28 March 2014

Classes in VBScript

Here is an example that shows how we can create a class in QTP. Once we define the class, we can create its objects and then access its method and properties.

'declare the class book.

Class Book

dim bn,bp
'class has 2 variable members bn and bp.

public Property Get bookname()
    ' Get bookname property gets the book name of the object of Book
  bookname = bn
End Property

public Property Let  bookname(x)
  bn = x
   ' Let  bookname property assigns value to the book name of the object of Book
End Property

public Property Get price()
price = bp
End Property

public Property Let  price(x)
bp = x
End Property

function  discountedPrice()
print bp-20
'We can have functions and procedures inside class to process memeber variables
End function

Private Sub Class_Initialize   ' Setup Initialize event.

MsgBox("Object of Book Class created")

End Sub

Private Sub Class_Terminate   ' Setup Terminate event.

MsgBox("Object of Book Class destroyed")

End Sub

End Class

Set b1 = new  Book
'createing the object b2 of the class Book.

b1.bookname = "QTP Tutorials"
b1.price = 220
'assigning value to the object b1

print b1.bookname()
'getting the value of the property bookname.

'accessing the function in class

Set b1 = nothing

QTP does support object oriented programming to some extent. We can create constructors and destructors in vbscript classes using class_initialize and class_terminate methods. class_initialize method acts like constructor function which gets called automatically when we create an object of the class. This is how we can create and use the classes in QTP.

No comments:

Post a Comment

Total Pageviews