Calling a C++ dll Function in Vb.net 2010

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C++

double __stdcall Dif(int a)
{
    if (a != 1300)
    {
        return value;
    }else
    {
        return 9048034884;
    }
}

This is my function in C++.
I want to call this dll function from VB.net 2010.
Please Help Me to do this.

Posted 16-Aug-13 20:44pm

Rohit Ramachandaran

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Rohit Ramachandaran · Accepted Answer · 2013-08-17T02:20:00

C++

Imports System.Runtime.InteropServices
Public Class Form1
    <DllImport("Dlllock.dll",
    CallingConvention:=CallingConvention.StdCall)> _
    Private Shared Function Dif(<MarshalAs(UnmanagedType.I4)> ByVal b As Integer) As Double
    End Function

VB

Dim a As Double
        a = Dif(1300)
        MsgBox(a)

Sergey Alexandrovich Kryukov · Accepted Answer · 2013-08-16T20:54:00

Solution 1

What you need is called P/Invoke: http://en.wikipedia.org/wiki/Platform_Invocation_Services[^].

You really need to learn how to use it. Please start here: http://msdn.microsoft.com/library/en-us/vcmxspec/html/vcmg_PlatformInvocationServices.asp[^].

This CodeProject article can also be useful: Essential P/Invoke[^].

Good luck,

—SA

Posted 16-Aug-13 20:54pm

Sergey Alexandrovich Kryukov

Comments

pasztorpisti 17-Aug-13 7:35am

A 5.

Sergey Alexandrovich Kryukov 17-Aug-13 11:40am

Thank you.
—SA