This article is about how to create a simple extension that you can build on for Small Basic (Microsoft). To get started you will need Small Basic, .NET Framework 3.5, and Visual Basic.NET 10. If you wish to see a tutorial for writing an extension in C#, click here.
 

STEP 1: Create an Extension

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1. Open Visual Basic and click on "Create New Project"
2. Click on "Class Library" and name it "MyFirstExtension"
3. After the project has loaded, delete all the code from Class1, and paste in the following code:
4. Imports System

   Imports Microsoft.SmallBasic.Library

   Imports System.Threading

   Imports System.IO

   <SmallBasicType()> _

   Public Module FirstModule

    

       Public Function ShowMessage(ByVal MsgTxt As Primitive) As Primitive

           MsgBox(MsgTxt.ToString)

       End Function

   End Module
   
   
5. Open the Solution Explorer and right-click on "MyFirstExtension" and go down to "Add Resource"
6. After the dialog opens click on the "Browse" tab and go to your Small Basic folder and click on "SmallBasicLibrary.dll"
7. That should take away all the errors

STEP 2: Make it Work

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1. Click on the Save button at the top of the screen
2. Go to Projects>MyFirstExtension Properties
3. Click on the "Compile" tab
4. Click on "Advanced Compile Options" at the bottom
5. Click on the drop-down for "Target Framework" and select .NET 3.5
6. Click "OK" and when the dialog pops up, click "Yes"
7. You can reopen the extension by opening the Solution Explorer and double-clicking on "Class1.VB"
8. Now, build the .dll by going to the top of the screen and clicking on Debug>Build MyFirstExtension
9. This will build the .dll to the "bin>Release" folder in the project
10. Go to the "bin>Release" file in File Explorer and copy all the files, except all the ones named "SmallBasicLibrary.dll" and "SmallBasicLibrary.xml"
11. Open Small Basic's folder and create a "lib" folder if there is already not one there
12. Open the "lib" folder and paste the programs inside YOU MAY NEED ADMIN PRIVILEGES TO DO THIS
13. Close Small Basic if it is open and re-open it
14. Now, all you have to do to use the extension is type in FirstModule.ShowMessage("YourMessageBoxTextHere")

STEP 3: Moving On

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To create more functions in the FirstModule, all you have to do is add more functions. If you need to get any variables from the user, just separate the ByVal YOURVARIABLE with commas. If you need to return a function, just put return before it like:

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