There are situations where we might need more functionality for our test framework which our QTP and Vbscript might not able to be provide us.
We know the .Net really powerful and there are lot of in-build classes, methods and properties available which we use them in C# or VB.Net, if we need to use the same in QTP, we can do so by using our very know “CreateObject
There are lot of DLL files available in .Net framework once you install, you can see them of course from your assembly folder under Windows directory, which we call as GAC (Global Assembly Cache).
We can almost use all of them, if we really need them and provided we know the exact functions and parameters to pass with the function.
In this demonstration, I am going to create a simple DLL file using “Class Library” project in Visual Studio and then going to use the same DLL in QTP.
So lets get started.
As I was saying, first we need to create a DLL file, which you can do so by using Visual Studio Class library
Next create a Class say “Libs
” and create a very simple functions as shown below
public class Libs
/// Adds Two integer values and returns the result
public int AddIntegers(int val1, int val2)
return val1 + val2;
/// Adds Two decimal values and returns the result
public decimal AddDecimals(int val1, int val2)
return val1 + val2;
/// Returns todays date as like Date() function in Vbscript
public DateTime Today()
Before deploying the DLL file, all we need to do is make the DLL accessible from your QTP. This we can do so by following simple procedure.
Click on the project properties and Click on the Assembly Information
from from Application Tab
Make sure that you Check the “Make assembly COM-Visible
Next go to “Build” tab and Check the “Register for COM interop
” as shown
Now build the complete project and now as you know your DLL file should have generated at your \bin\debug
The final step is to call the DLL file from QTP, all you need to write a simple code as shown below
'Use .Net DLL files Using Create Object
Set DotNetObject = CreateObject("ForQTPLibs.Libs")
Once you run the script, you will get the output
That’s it !!!
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if you find this post needs any modification.
3 Replies to “Calling DLL files in QTP using CreateObject”
Simply explained!!!! Thanks
it is very nice article,
How can i get or use UI custom DLL into our script.
Can you please help me in the below scenario,
I have to call the method from from a .vb file in UFT:
I should display/call the function Getmyname() and display the MsgBox(“Hello world”)
Here you can see the details:
Public Module globalMod
Public gCompCollection As New ArrayList
Public Sub Getmyname()
Catch ex As Exception