I've to invoke a unmanaged dll fucntion in C# which uses
a callback fucntion.My problem is that the function is
executing finely but I'm not getting correct output
Error: The return code is 0 which means the fucntion has

I am looking for some help.  I have a 3rd party DLL that I am trying to use
from within VS .NET 2003.  I have written C++ code inside VS .NET 2003
to access the DLL.  I am now trying to transfer data from C++ to C#.
Here is some code that represents the problem.  

I'm looking for information on how to take an existing
C++ COM Windows Service ( an EXE ) and Wrap it so I can
access it via ASP.NET C# and .NET remoting.
Can't seem to locate any Doc on how to do this.  I want

this one is a little bit tricky...
We have a web project in ASP.NET which uses the functionality of a COM
object, which we store in Session scope between multiple http requests.
We tested this scenario on several OS and PCs - and we found out that in

I've created a small vb.net app that uses MAPI to send
email. It works fine on my development computer.
I created an InstallShield setup, which includes MSMAPI
and Interop.MSMAPI.dll.

In the following smartcard api function i have to marshal Lpctstr and
Lptstr.
SCardListReaders((handle) hContext,LPCTSTR mszGroups,LPTSTR
mszReaders,LPDWORD pcchReaders)

Just created an Excel.dll with: TlbImp Excel9.olb Excel.dll
Then created the using directives:
using System;
using System.Reflection; // For Missing.Value and BindingFlags

[Please do not mail me a copy of your followup]
I'm trying to expose a COM interface to VBScript.  We want to return an
array of objects from a method.  At first we ended up with IDL that
said we were returning an array of custom structures.  Since VBScript

In reference to setdlgitemText and messagebox APIs.
I am using vb.net to change the name of a button in a custom messagebox.
The best I can come up with is that the button is displaying empty or
nothing strings because I am getting extended ascii characters as the

In a previous thread of mine ("Problem with System.Reflection.Emit-ed
PInvoke method's arguments") I received help from Mattias Sjögren
(thanks again BTW) in getting my reference parameters, in dynamically
generated assemblies with PInvoke methods, marshaled correctly. I've now

I have a .NET class which we need to license by including a
licenses.licx file in any VB.NET / C# project which accesses it. This
works great.
Does anybody know how we can access this .NET class from VB6? I have

Trying to not allow anything being pasted in textbox control in vb.net.
The following doesn't seem to be working
  Private Const WM_COPY = &H301
   Private Const WM_PASTE = &H302

I know a .net class can be registered for COM, but can a VB-script use
CreateObject or GetObject and use a non-registered file location to get the
object?
Basically, can you call .net from COM directly from the assembly file,

I am using ShellExecuteEx with "Runas" verb with declarations
appended.  ShellExecuteEx succeeds, but when used with
lpVerb = "runas", the Run as dialog appears, but application (notepad.exe)
does not display, but shows in the TaskManager  (W2k).

How does COM Interop perform when up against the likes of
Delphi?
It seems that calling the same COM object n times in
Delphi code out-performs the equivalent in C#.