com-interop

Didn't quite get the following from MSDN : ClassInterfaceType.None Indicates that no class interface is generated for the class. If no interfaces are implemented explicitly, the class can only provide late-bound access through the IDispatch interface. This is the recommended setting for ClassInterfaceAttribute . Using ClassInterfaceType.None is the only way to expose functionality through interfaces implemented explicitly by the class. Is [ComVisible(true)] a must for COM visibility? See this blog post for the expanation of the first problem. The point is that unless you specify

Does a System.Runtime.InteropServices.COMException of 0x80040154 always mean that the class isn't registered? I'm getting a COMException which says "Retrieving the COM class factory for component with CLSID {29131539-2EED-1069-BF5D-00DD011186B7} failed due to the following error: 80040154." It's trying to load Interop.Domino.dll which is a reference I got from the COM tab of Add Reference called "Lotus Domino Objects" which points to domobj.tlb in the Notes program folder. I wrote the code years ago - it's the only thing I've ever done with interop and it's fair to say that I never really got

I'm trying to run my application on a server which does not and will not have Office installed on it. using EXCEL = Microsoft.Office.Interop.Excel; ... EXCEL.Application app = new EXCEL.Application();//Exception thrown here The code is working fine on my own system, but on the server it gives the following exception: Unhandled Exception: System.Runtime.InteropServices.COMException: Retrieving the COM class factory for component with CLSID {...} failed due to the following error: 80040154 Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG)). both systems are 32bits,

How to pass a VB6 string array [Assume, s =Array("a", "b", "c", "d")] to C#.Net through COM Interop? I tried to implement passing C# string array to VB and VB string array to C# as below C#->VB working fine but other way (VB=>C#) giving a compile error called "Function or interface marked as restricted, or the function uses an automation type not supported in visual basic" . My code below C# public interface ITest { string[] GetArray(); void SetArray(string[] arrayVal ); } public class Test : ITest { string[] ITest.GetArray() { //Working fine string[] stringArray = { "red ", "yellow", "blue" }