How Functional Libraries are used in QTP?

In order to modularize the script, library Files are added to the QTP Script. It contains variable declaration, Functions, Classes etc. They enable reusability that can be shared across test scripts. They are saved with an extenstion .vbs or .qfl

How to Associating Function Libraries

Method#1 : "File" > "Settings" > Resources > Associate Function Library option. Click on "+"

Method#2 : Using ExecuteFile method.

for eg ExecuteFile "C:\lib1.vbs"

Method#3 : Using LoadFunctionLibrary Method.

for eg LoadFunctionLibrary "C:\lib1.vbs"

Method#4 : Using AOM

Automation Object Model(AOM), a mechanism using which we can control various QTP operations outside QTP.

Using AOM

• We can launch QTP
• Open the Test, 
• Associate Function Libraries etc. 

The Following Vbscript should be saved with Extension .vbs and upon executing the same, QTP will be launched and test would start executing. 

Set objQTP = CreateObject("QuickTest.Application")  'Launch QTP

objQTP.Launch

objQTP.Visible = True

objQTP.Open "D:\GUITest2", False, False 'Open the test

Set objLib = objQTP.Test.Settings.Resources.Libraries

'Associate Function Library if NOT associated already.

If objLib.Find("C:\lib1.vbs") = -1 Then

objLib.Add "C:\lib1.vbs", 1

End