DOT NET Interview Questions - DotNetSpider

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The second way to create CCW using InteropServices attributes.Here interfaces are
created automatically.
Following are different type of class attributes :
None :No class interface is generated for the class.This is default setting when you do not specify
anything.
AutoDispatch :- Interface that supports IDispatch is created for the class. However, no type
information is produced.
AutoDual :- A dual interface is created for the class. Typeinfo is produced and made available in
the type library.
In below source code we have used the third attribute.
Imports System.Runtime.InteropServices
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Public Class ClsCompliant
End Class
Other than class attributes defined up there are other attributes with which you can govern other
part of assembly.Example “GuidAttribute” allows you to specify the GUID,”ComVisibleAttribute
“ can be used to hide .NET types from COM etc.All attributes are not in scope of the book as
this is a interview questions book refer MSDN for more details.
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Once .NET assembly is created using either interface or using interopservices method
we need to create a COM type library using Type library export tool.
Tlbexp (AssemblyName)
The final thing is registering the CCW in registry using regasm tool.
regasm AssemblyName [Options]
Finally refer the TLB in your COM IDE Below is figure showing VB6 IDE referencing
the DLL
Note :- DLL and TLB should be in same directory where the application is executed.
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