rednael

[[COPIED from About Me]]

Hi Martijn Thie,

i am right now programming a C# dll for a vb app. I got a problem to use a struct defined in C# dll by the vb app. Here is my code:

The error information is type mismach when i compile the VB APP. Any idea , where come from this error. Thanks very much.

// C# DLL code
namespace CallerSpace
{

public interface Icall
{
void getSentence(myDATA d);
}

[StructLayout(LayoutKind.Sequential)]
public struct myDATA
{
public int time;
public int Status;
}

public class CALL: Icall
{

public void getSentence(myDATA d)
{
......
}

}

}

// VB Application code
Sub Main
Dim call As CallerSpace.Icall
Set call = New CallerSpace.CALL

Dim mdata As myDATA
mdata.Status = 1
mdata.time = 122

call.getSentence(mdata) // here: error > type mismatch

End Sub

Hi Bag,

I'm not quite sure, but it might be the:
"Dim mdata As myDATA"

Maybe you want to declare it like this:
"Dim mdata As CallerSpace.myDATA"

I'm sorry that I can't be sure right now. As I'm attending the PDC 2008 in Los Angeles, United States right now, time is not on my hand. As there are many great new topics here and many great sessions I have to fly... :)

So, please try it. If it doesn't work, I'll try to help you later on...

Hi Mrtijn Thie,

sorry i posted the question under "about me". And thanks for your time and your reply.

I have solved the problem last night. I pass the struct a reference. Then It works.
But I do not know why I can not pass the struct. Maybe my question is: how to pass values from C# dll to VB app, or vise versus.

PS:U are at the PDC 2008 right now? That cool.

Have a nice trip in the USA!


// C# DLL code
namespace CallerSpace
{

public interface Icall
{
void getSentence(ref myDATA d); // here I pass the struct as a reference
}

[StructLayout(LayoutKind.Sequential)]
public struct myDATA
{
public int time;
public int Status;
}

public class CALL: Icall
{

public void getSentence(ref myDATA d) // add "ref" here
{
......
}

}

}