Library tutorials & articles
COM Interoperability in .NET Part 2
- Introduction
- The managed code
- Generating a Type Library
- The unmanaged code
The unmanaged code
Once the assembly is registered and properly installed, the types defined within the assembly can be used from COM as though they were normal COM types. Now you can create a simple VB 6 Standard EXE project type and as I already said confirm whether you set a reference to the new generated type Library. Place this code in the code section and now you see the usage of our .NET type in Classic COM.
Private Sub Command1_Click()
Dim a As New Calculator
MsgBox a.Add(100, 100), vbInformation, "ADDITION
(100,100)"
MsgBox a.GetType, vbInformation, "INFORMATION-TYPE"
MsgBox a.Hello("India"), vbInformation, "STRING"
MsgBox a.Subtract(100, 1), vbInformation, "SUBTRACTION(100-1)"
Dim i As Imuldiv'INTERFACE
Set i = a
MsgBox i.Multiply(100, 100), vbInformation, "MULTIPLICATION(100*100)"
MsgBox i.Division(100, 100), vbInformation, "DIVISION(100/100)"
End Sub
Summary
A lot of companies have spent a great amount of money and time in COM components. With introduction of .NET people are worried about the future of COM. Microsoft has recognized this and provide means to use classic COM components in .NET code and vice versa.
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.