Can't get last errors from COM Object in C#

Question

My C# code:

bvt = Activator.CreateInstance(Type.GetTypeFromProgID("xxx.BVT"));

// calling a function that terminates with an error
bvt.GiveMeAnError();

var msg = "";
long number = 0L;
bvt.GetLastError(number, msg);

result = "Errornumber:"+ number + " Errormessage:"+ msg;

The result is:

"Errornumber:0 Errormessage:"

My problem is the function GetLastError(). Number and msg should contain the errornumber and message after execution of this function. But they are still empty.

Can somebody help me?

* EDIT *

I executed the following code as VBScript:

Dim StdOut
Set StdOut = WScript.StdOut
Set bvt = CreateObject( "xxx.BVT" )

bvt.GiveMeAnError()

bIsLastErr = bvt.GetLastError( ErrNo, ErrMsg )
StdOut.WriteLine( "Erronumber: " & ErrNo & ", Errormessage: " & ErrMsg )

This VBScript with cscript is working fine. I also get the errormessage and number. So the GetLastError() Method works.

Answer 1

You need to pass the variables by reference as they're apparently set in the method:

bvt.GetLastError(ref number, ref msg);