Call VB6 or VC++ classes from C#

lpinho · September 22nd, 2003, 09:44 AM

Hi,

  Someone told me that it's possible to call methods of classes made with VB6 or VC++ from C# using reflection...

  After made some investigation it seems that it's really true, I really can make a call to a "old" method using a "new" language :)

  So after gathering all the evidences I tried to build a pratical example.

  When I try to make the call to the method an exception is thrown:

Unhandled Exception: System.Security.SecurityException: Request for the permission of type System.Security.Permissions.SecurityPermission, mscorlib, Version=1.0
.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 failed.
   at COMReflectionExample.Client.Main(String[] args)

The state of the failed permission was:
<IPermission class="System.Security.Permissions.SecurityPermiss ion, mscorlib, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Flags="UnmanagedCode"/>

Here's the code:
It calls a method WhoAmI, that exists in the class ClassY made in ProjectX (made w/ VB6)

Code:

      Type T = Type.GetTypeFromProgID("ProjectX.ClassY");
      object o = Activator.CreateInstance(T);

      object returnValue;
      object [] arguments = new object[1];
      arguments[0] = "Bob";
 
      returnValue = T.InvokeMember("WhoAmI",
                                   BindingFlags.InvokeMethod,
                                   null,
                                   o,
                                   arguments);
      Console.WriteLine(returnValue);

      Console.ReadLine();

Thank You for the help,

LuÃs Pinho