cominterop runtime callable wrapper

[Ariel Gimenez]

Hi, maybe some of you can give me a hand with this,
I have a dll written in VB 6 but i havent the source code of it.
In Visual Basic 6 this dll instanciates with createobject and the method was
accesed in this way:

mydll.method "1", "2", "3", True

Now in Asp.net when i add the reference and try to call it this way:

mydll.method("1","2","3",true);

It fails telling me that the parameters are by reference!!!! and some of the
parameters appears in the intellisense as ref object!!!!
The TLBIMp is wrong?

thanks

[Nicholas Paldino [.NET/C# MVP]]

Ariel,

No, it is not wrong. If in a method definition there are no modifiers,
then VB will pass them by reference. So, to call them, you have to use:

string pstr1 = "1", pstr2 = "2", pstr3 = "3";
bool pbln1 = true;

// Make the call.
mydll.method(ref pstr1, ref pstr2, ref pstr3, ref pbln1);

That is assuming that the parameters are typed, and not variants. If
they are variants, then you will have to declare pstr1, pstr2, pstr3, and
pbln1 as objects, and cast to/from the object. In this case, you might want
to write wrapper objects that are type-safe, so that you don't have to deal
with casts every time.

Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

"Ariel Gimenez" <[e-mail]> wrote in message
news:en**************@TK2MSFTNGP11.phx.gbl...

Hi, maybe some of you can give me a hand with this,
I have a dll written in VB 6 but i havent the source code of it.
In Visual Basic 6 this dll instanciates with createobject and the method was accesed in this way:

mydll.method "1", "2", "3", True

Now in Asp.net when i add the reference and try to call it this way:

mydll.method("1","2","3",true);

It fails telling me that the parameters are by reference!!!! and some of the parameters appears in the intellisense as ref object!!!!
The TLBIMp is wrong?

thanks

[Ariel Gimenez]

Thanks Nicholas!

Your solution works fine to me!!!!

"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard.caspershouse.com> wrote in
message news:%2****************@tk2msftngp13.phx.gbl...

Ariel,

No, it is not wrong. If in a method definition there are no modifiers, then VB will pass them by reference. So, to call them, you have to use:

string pstr1 = "1", pstr2 = "2", pstr3 = "3";
bool pbln1 = true;

// Make the call.
mydll.method(ref pstr1, ref pstr2, ref pstr3, ref pbln1);

That is assuming that the parameters are typed, and not variants. If
they are variants, then you will have to declare pstr1, pstr2, pstr3, and
pbln1 as objects, and cast to/from the object. In this case, you might want to write wrapper objects that are type-safe, so that you don't have to deal with casts every time.

Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

"Ariel Gimenez" <[e-mail]> wrote in message
news:en**************@TK2MSFTNGP11.phx.gbl...

Hi, maybe some of you can give me a hand with this,
I have a dll written in VB 6 but i havent the source code of it.
In Visual Basic 6 this dll instanciates with createobject and the method

was

accesed in this way:

mydll.method "1", "2", "3", True

Now in Asp.net when i add the reference and try to call it this way:

mydll.method("1","2","3",true);

It fails telling me that the parameters are by reference!!!! and some of

the

parameters appears in the intellisense as ref object!!!!
The TLBIMp is wrong?

thanks