.... Continues from Part
I
They will discover the
following:
// Generated .IDL file (by the OLE/COM Object Viewer)
//
// typelib filename: sample.tlb
[
uuid(AD7B6A7C-4F96-3710-B1AC-5170E611BA57),
version(1.0),
custom(90883F05-3D28-11D2-8F17-00A0C9A6186D, sample, Version=0.0.0.0, Culture=neutral,
PublicKeyToken=null)
]
library sample
{
// TLib : // TLib : Common Language Runtime Library : {BED7F4EA-1A96-11D2-8F08-00A0C9A6186D}
importlib("mscorlib.tlb");
// TLib : OLE Automation : {00020430-0000-0000-C000-000000000046}
importlib("stdole2.tlb");
// Forward declare all types defined in this typelib
interface _T;
[
uuid(4996A037-02BD-3839-A363-A9A321885D2C),
version(1.0),
custom(0F21F359-AB84-41E8-9A78-36D110E6D2F9, T)
]
coclass T {
[default] interface _T;
interface _Object;
};
[
odl,
uuid(742F958A-4C27-399F-89DD-5368588B63B7),
hidden,
dual,
oleautomation,
custom(0F21F359-AB84-41E8-9A78-36D110E6D2F9, T)
]
interface _T : IDispatch {
};
};
What is wrong there?
Our public string A method is nowhere to be seen, also familiar methods
belonging to Object are hidden.
That means that VB code
editor won't be able to help in a way which we would like to show as methods
and properties of the class. So what could be done to improve that kind
of situation? Help comes from attributes. Change your C# code to this:
using System;
using System.Runtime.InteropServices;
[ClassInterface(ClassInterfaceType.AutoDual)]
public class T
{
public string A(string s)
{
return s+" from C#";
}
}
Repeat steps to compile,
get tlb and register library, copy sample.dll and str.tlb to corresponding
directory and try early binding. Everything will work fine.
...to be continued in
Part III
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