Hi Folks!
Good day
Today, I'm going to discuss
ab't Invoke Managed Code from Unmanaged Code.,how to use managed assembly
from VB or VB script. For a start we will first check managed side of story.
To expose managed types, properties, fields, or events to COM they must
be public. Types can't be abstract and they must have default constructor.
It's recommendable to define interface explicitly but it is not necessary,
tools provided with .NET Platform are capable of creating one for you.
Let's try it.
using System;
public class T
{
public string A(string s)
{
return s+" from C#";
}
}
Copy and paste code in
notepad and save it as sample.cs. Open command line and execute the following:
csc /t:library sample.cs
tlbexp sample.dll /out:sample.tlb
regasm sample.dll
Copy sample.dll and sample.tlb
to corresponding directory. To check early binding add reference to your
library, browse to and select sample.tlb. Insert new module into project
and paste the following in code editor:
Sub Test()
Dim o As New T
MsgBox o.A("Hello"), , "VBA test"
End Sub
Sub LBTest()
Dim o
Set o = CreateObject("T")
MsgBox o.A("Hello"), , "VBA late binding test"
End Sub
If you like to do the
same from VB script copy sample.dll and sample.tlb to "C:\WINNT\system32"
because wscript.exe will need these to execute your script. Create new
.VBS file and paste into it the following:
Dim o
Set o = CreateObject("T")
MsgBox o.A("Hello"), , "VBS test"
When you are done with
testing don't forget to unregister your sample.dll, to do that execute
from command line "regasm sample.dll /unregister". Also deleting
sample.dll and str.tlb copies from corresponding path and "C:\WINNT\system32"
is a good idea. But some developers will be interested to examine in closer
details what is in sample.tlb.
..........................................
to be continued in Part II
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