VBA - classes and structures videos | Excel VBA Part 35 - Class Modules

Posted by Andrew Gould on 13 October 2014


Class Modules in VBA allow you to define your own classes of objects. This video explains why that's a useful and shows you how to go about creating a class. You'll learn about the two class events: initialise and terminate, you'll see how to define properties, including how to create read-only properties and set default values. You'll also find out how easy it is to create methods for your class and how to use your class in your regular code.

See our full range of VBA training resources, or test your knowledge of VBA with one of our VBA skills assessment tests.

There are no files which go with this video.

There are no exercises for this video.

Making a  video bigger

You can increase the size of your video to make it fill the screen like this:

View full screen

Play your video (the icons shown won't appear until you do), then click on the full screen icon which appears as shown at its bottom right-hand corner.

 

When you've finished viewing a video in full screen mode, just press the Esc key to return to normal view.

Improving the quality of a video

To improve the quality of a video, first click on the Settings icon:

Settings icon

Make sure you're playing your video so that the icons shown appear, then click on this gear icon at the bottom right-hand corner.

 

Choose to change the video quality:

Video quality

Click on Quality as shown to bring up the submenu.

 

The higher the number you choose, the better will be your video quality (but the slower the connection speed):

Connection speed

Don't choose the HD option unless you have a fast enough connection speed to support it!

 

Is your Wise Owl speaking too slowly (or too quickly)?  You can also use the Settings menu above to change your playback speed.

This page has 1 thread Add post
duggie   Reply to duggieReply
31 Jan 20 at 13:25

Hi,

Can you please explain why Method 1 fails but Method 2 works?

Method 1:

'This is Class1

Option Explicit

Public MyArr As Variant

Private Sub Class_Initialize()

    ReDim MyArr(1 To 5) As Variant
    Dim i As Integer

    For i = 1 To 5
        MyArr(i) = 0
    Next i

End Sub

'This is in a standard module

Option Explicit

Sub Start()

    Dim abc As Class1
    Set abc = New Class1

    abc.MyArr(1) = 10
    Debug.Print abc.MyArr(1)

End Sub

After this line has been run:

abc.MyArr(1) = 10

in the Immediate Window, I see:

abc.MyArr(1) = 0

I expect it to be 10.

 

However using tmp variable seems to do the trick.

Method 2:

Sub Start()

   Dim tmp As Variant
   Dim abc As Class1
   Set abc = New Class1
  
   tmp = abc.MyArr
   tmp(1) = 10
   abc.MyArr = tmp
   Debug.Print abc.MyArr(1)

End Sub

Thanks

 

Andrew G   Reply to Andrew GReply
01 Feb 20 at 13:05

Hi duggie, I hope it's OK to answer this question with a link but there's a good explanation of what's going on here https://stackoverflow.com/questions/25328975/array-as-a-class-member

I hope that helps!

duggie   Reply to duggieReply
04 Feb 20 at 17:29

Thanks for the link.

 

 

Add a new post