struct in a C# dll used in a vb application

tttbag

Hi,

I have a self defined struct in my C# dll, it will be used by a vb application.
I got error: type mismatch, by debugging the VB code.

Here is my code:

// 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

Any one know, where comes from the error?

Thank you!!

bag

witte

Are NMEA_RMC_DATA and DATA different?

// C# DLL code
namespace CallerSpace
{

    public class CALL: Icall
    {

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

    }

}

tttbag

Sorry witte,

i made the mistake. I typed too quickly. Now I corrected the code.

But still the problem type mismach.

Any idea?

Regards,

bag

witte schrieb:

Are NMEA_RMC_DATA and DATA different?

[/cpp]

tttbag

my problem maybe : I do not know how to pass the struct type across the DLL boundary.

witte schrieb:

Are NMEA_RMC_DATA and DATA different?
// C# DLL code

tttbag

Hi guys,

I have solved the problem.

Just pass the struct as a reference. Then no error popup.

change

void getSentence(myDATA d) 

to
void getSentence(ref myDATA d);

Regards,

bag

Konrad Rudolph

The code won't work in VB because `Call` is a reserved word here. Either you change the variable name or you escape it by putting it in braces:

Dim [call] As CallerSpace.Icall

However, I'm not sure if the current version of VBA does support escaping variable names. VB6 didn't (only for Enum constants).