C++ Wrapper for VB.net

Hello Guru's:

I am trying to create a wrapper for C++ dll using a vb.net. I have manage to create a wrapper but upon calling the function
I have encounter a error: "Attempted to read or write protected memory. This is often an indication that other memory is corrupt"

Below is my code in importing the c++ dll

Code:

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Imports System.Runtime.InteropServices

Public Class MYWrapper   
    <DllImport("MYtest.dll", CallingConvention:=CallingConvention.Cdecl, CharSet:=CharSet.Ansi)>
    Public Shared Sub Reset(ByVal sSection As [String], ByVal lResult As Int32)
    End Sub   
    <DllImport("MYtest.DLL", EntryPoint:="Init", SetLastError:=True, _
        CharSet:=CharSet.Ansi, ExactSpelling:=True, _
        CallingConvention:=CallingConvention.StdCall)> _
    Public Shared Sub Init(ByVal objectInstanceName As String, ByVal sPath As String, ByVal sSection As String, ByVal sTestPlanRevision As String, ByRef lResult As Int32)
    End Sub
End Class

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C++ Header

Code:

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extern "C" MY_API void Reset  (const char *sSection, long &lResult);
extern "C" MY_API void Init    (const char *sObjectInstanceName, const char *sPath, const char *sSection, const char *sTestplanRevision, long &lResult);

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VB.net Program

Code:

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Dim IResult As Int32

        Const sOjectname As String = "C:\confg.cfg"
        Dim sError As String
        Const sProductConf As String = "Config.cfg"
        Const sOperation As String = "TEST0001"
        Const sTPRev As String = "V1"

        Try
            MYWrapper.Wrapper.Init(sOjectname, sProductConf, sOperation, sTPRev, IResult)
        Catch ex As Exception
            sError = ex.Message.ToString()
        End Try

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Regards,
Newbie here

Please, edit your post to add the Code tags around the code snippets. Otherwise your code is absolutely unreadable!

Do the dll functions work when called from a C++ test project?

Hello Arjay:

YES is 100% working when it is being called in the C++ test project.. I don't have the source code of this c++ dll, I only have the DLL and a .H header.



Regards,
Newbie here

Quote:

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Originally Posted by Arjay

Do the dll functions work when called from a C++ test project?

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@VictorN:

Sorry if you could not read my code., I don't know how to put my code around the code snippets.

Quote:

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Originally Posted by VictorN

Please, edit your post to add the Code tags around the code snippets. Otherwise your code is absolutely unreadable!

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Quote:

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Originally Posted by kpax1684

@VictorN:

Sorry if you could not read my code., I don't know how to put my code around the code snippets.

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Hmm, being almost four years here in Forum but not having read the Announcement: Before you post.... yet? :confused::eek:

Thanks, VictorN for reminding me.., I tried to make it colorful but this is i've got..,

Quote:

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Originally Posted by VictorN

Hmm, being almost four years here in Forum but not having read the Announcement: Before you post.... yet? :confused::eek:

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Quote:

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Originally Posted by kpax1684

Thanks, VictorN for reminding me.., I tried to make it colorful but this is i've got..,

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it's OK now. To be readable code has to be formatted with proper tabs7indentations and whitespaces. Colorisation is not so important!

Check out the pinvoke.net site.

I have checked the pinvoke site but I could not get a better explanation there..,

Quote:

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Originally Posted by kpax1684

I have checked the pinvoke site but I could not get a better explanation there..,

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How you use the pinvoke.net site is you find a signature that is correct for your function prototype. There are many examples of Win32 prototypes so you should be able to find one similar to what you need.