Returning good old string parameters with Type.InvokeMember

[Guest]

Hi
I need to be able to return a string from a VB6 method:

Public Sub GetMessageAsParameter(ByRef message As String)
message = "GetMessageAsParameter worked!"
End Sub

which is implemented inside an ActiveX DLL. I need to do this using late
binding so I am trying to do it with code like this:

object[] parameters = new object[1];
ParameterModifier parameterModifiers = new ParameterModifier(1);

// Allocate some space for the parameter
parameters[0] = new string(' ', 100);

parameterModifiers[0] = true;
ParameterModifier[] parameterModifier = { parameterModifiers };

comType.InvokeMember("GetMessageAsParameter",
BindingFlags.InvokeMethod, null, comObject, parameters, parameterModifier,
null, null);

Console.WriteLine(String.Format("\nGetMessageAsParameter:
Message={0}", parameters[0].ToString()));

The problem is that I never get anything coming back. I don't get any
TargetInvocationExceptions either. I've tried all the different options of
ByVal and ByRef without success.

Please could anyone advise.

Thanks

Marek

 

[Guest]

Hi
I've worked it out:

parameters[0] = new StringBuilder(100).ToString();

Thanks.

Marek

 

[Guest]

Not sure what happened with the previous reply (appears blank), but the fix
for my problem was:

parameters[0] = new StringBuilder(100).ToString();