[RESOLVED] [2005] Referencing C++ DLL

[campster]

I am having problems referencing a C++ DLL from my .Net App. Everything works fine onthe machine that I build the app but if I try to run the app on a different machine I get an error:

Could not load file or assembly 'AClassLib'.

I've simplified the app and DLL down to 2 functions. What am I missing?

Imports AClassLib
Public Class Form1
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        'Dim ACL As AClassLib.Class1 = New AClassLib.Class1
        Dim ACL As New AClassLib.Class1
        Dim a As Double
        Dim b As Double
        Dim c As Double
 
        a = TextBox1.Text
        b = TextBox2.Text
 
        Try
            c = ACL.AddEm(a, b)
        Catch ex As Exception
            MessageBox.Show("Button1_Click: " & ex.Message.ToString)
        End Try
 
        lblAnswer.Text = c
    End Sub
End Class

#include "stdafx.h"

#include "AClassLib.h"

namespace AClassLib {

	double Class1::AddEm(double A, double B)
{
	return A + B;
}
}

[campster]

It appears that you need to install a redistribution app to use the C++ DLL. The app is

C:\Program Files\Microsoft Visual Studio 8\SDK\v2.0\BootStrapper\Packages\vcredist_x86\vcredist_x86.exe

Does anyone know why this application is required?

[bmahler]

you need to declare the function for the c++ dll. Just like declaring for API

Public Declare Function AddEm Lib "DLLName.dll" (ByVal A As Double, ByVal B As Double) As Double

obviously replace DLLName.dll with the name of your dll.

If you declare the function you can then call it from code. The c++ dll needs to be either in the application directory or the system32 directory

[campster]

you need to declare the function for the c++ dll. Just like declaring for API

I tried that and it didn't work. I had to install the redistribtion application and everything is fine. I'mreading MSDN now about dll Manifests

http://msdn2.microsoft.com/en-us/lib...42(vs.80).aspx

[campster]

Found the problem. Some of the other libraries that were being included in the main application was built as debug versus release. The dll could not resolve the debug functions and was crashing. Until we get release versions of the libraries we had to put debug versions of the CRT (msvcm80d,msvcp80d and msvcr80d) in the directory with our DLL.