Hello,
I have been building a C++ DLL for a visual basic project. The VB finds the DLL and allow me to step through it while debugging. However, the DLL only passes in the first parameter of the subroutine call. All other parameters
show an invalid memory location error. The VB looks something like this:
Imports System.Runtime.InteropServices
Public Class Form1
<DllImport("interpolation.dll", ExactSpelling:=False, CallingConvention:=CallingConvention.Cdecl)>
Shared Function main(ByVal xin As Single, ByVal yin As Single) As Single
End Function
Private Sub Form1_Load(sender As Object, e As
Dim a As Single
Dim b As Single
a = 26000
b = 20
Label2.Text = main(a, b)
End Sub
and the C++ like this:
#include <iostream>
#include <stdlib.h>
#include <string>
#define DllImport __declspec(dllimport)
#define DllExport extern "C" __declspec(dllexport)
using namespace std;
DllExport float main(DllImport float xin, DllImport float yin)
{
}
I have omitted the body of the code but left all of the call. I believe I have most of the syntax correct but can not figure out why it only passes in xin but not yin. Like I said before it shows an invalid memory location. xin come
in correct as a float, I don't know why yin does not. I have been working on this a few month and have tried many different combinations. Any advice would be very appreciated.
Thank you!
