Library tutorials & articles
COM Interoperability in .NET Part 2
- Introduction
- The managed code
- Generating a Type Library
- The unmanaged code
The managed code
To illustrate COM type communication with managed code, Let us see an example
in which I create a C# class library which has a class named Calculatorwhich
supports three methods named Add(),Subtract()and Hello(). Notice that we define
another interface named Imuldiv.
namespace Simpleclasslib
{
using System;
using System.Runtime.InteropServices;
public interface Imuldiv
{
int Multiply(int x,int y);
int Division(int x,int y);
}
public class Calculator:Imuldiv
{
public Calculator(){}
public int Add(int x,int y) {
return x+y;
}
public int Subtract(int x,int y)
{
return x-y;
}
int Imuldiv.Multiply(int x,int y)
{
return x*y;
}
int Imuldiv.Division(int x,int y)
{
return x/y;
}
public string Hello(string strName)
{
string str ;
str = "Hello " + strName ;
return str ;
}
}
}
Once the managed code is written, the compilation process is the same as it would be for any other piece of managed code.
csc /out:Server.dll /target:library Calculator.cs
Now let us see the Server.dll in the ILDasm.exe.In that you can see the calculator class members and Imuldiv Interface members.
G.Gnana Arun Ganesh is the Administrator and the Founder of ARUN MICRO SYSTEMS (www.arunmicrosystems.netfirms.com). He has been programming in C++, Visual Basic, COM, Java and Microsoft Technologie...
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Hello, good news!!!
I just figured out what was missing in what was reported in previous comment.
In the Properties Pages of the .NET project, choosing "Configuration Properties" on the left panel, and then "Build", there is a switch labelled "Register for COM Interop", and of course it has to be set "ON", for all this to work as expected!!!!
Well, let's keep working.!!!!
Be well!!!!!
Hello, G.Gnana Arun:
Hi, good day, greetings from Mexico City.
Well, this post is to commet I just tried your implementation, I created a .NET DLL with VB.NET, then followed the .TLB file, just as you specify in your article, but at the moment of using the library in a VB 6.0 project, using the reference to the .TLB file, as you dictate, just when the object is to be instantiated, I receive a Num 429 error, "ActiveX Object can´t be created". I include here the code for the class in VB.NET:
Public
Class cDotNetUtilsVB60 Public Shared Function IsPositiveInfinity(ByVal pdblNum As Double) As Boolean Dim lnuNumTem As Double Return lnuNumTem.IsPositiveInfinity(pdblNum) End Function Public Shared Function IsNegativeInfinity(ByVal pdblNum As Double) As Boolean Dim lnuNumTem As Double Return lnuNumTem.IsNegativeInfinity(pdblNum) End FunctionEnd
ClassCan you figure out what I'm doing wrong???????
Thanks in advance, be well
Roberto Gutierrez R.
This thread is for discussions of COM Interoperability in .NET Part 2.