com-interop

Objective : build a C# DLL with COM interop to be called by Delphi on another environment. Problem : Windows is blocking my build, saying that I don't have privileges to edit the registry. Context: I'm using Windows 8, Visual Studio 2012, UAC is turned off. I'm using RGiesecke's DllExport to annotate with [DllExport] the methods that I want to export as an Dll. I'm using [ComVisible(true)] as suggested here . My solution platform target is x86 I edited my solution's build propertires and checked Build > Output > Register for COM Interop I edited by AssemblyInfo.cs and enabled [assembly:

I have a C# project, where I would like to access MS outlook, if it is installed on a client´s machine. The "access outlook" part has been done by referencing the outlook COM object, and going from there. My problem is now the "if it is installed" part. At the moment, my project doesn´t compile on machines without outlook installed, so I assume that I will have to not reference the outlook component, and instead load and use it dynamically, after detecting that outlook is present, but I haven´t found a way to do this. Am I correct, and does anybody have any hints on how to do this? Thanks.

I'm writing an application for the Peachtree API and it needs to work with any version of the API. Unfortunately the dll from Peachtree 2011 can't interact with Peachtree 2010, and vice versa, even though the two dlls are stored in the same location and run with exactly the same code. I thought I should be able to refer to the dll by it's file path, leave specific version at false, embed interop types at false, and copy local at false and it would just use whatever version the machine had, but I get an error when I do that - "Exception has been thrown by the target of an invocation." Is there

The Microsoft.Office.Interop.Word._Document interface has a method with the following signature: void Close(ref object SaveChanges = Type.Missing, ref object OriginalFormat = Type.Missing, ref object RouteDocument = Type.Missing); A few points I am having trouble understanding: A ref parameter cannot have a default value. A default value has to be a constant, and Type.Missing is not. When calling this method, I can use Close(false) - normally a ref parameter requires an assignable variable? When navigating to the definition of Type in Visual Studio, it takes me to the _Document.Type property,

Trying to create a mapper for an Microsoft Office object to POCO's and found this // doesn't work // returns an empty array where o is a RCW on an office object foreach(var pi in o.GetType().GetProperties() ) tgt.SetValue(rc, pi.GetValue(o, null)); so have to resort to this foreach(var field in tgt.GetFields() ){ var pv = o.InvokeMember(field.Name, System.Reflection.BindingFlags.GetProperty, null, o, null); i.SetValue(rc, pv); } which works for now but wondering why the RCW.GetProperties() doesn't work here? The other two answers as of this writing are correct, but they miss an important

This code run without problem in release r debug when Visual studio isn't started as an admin. Marshal.GetActiveObject("Outlook.Application"); However, when I start Vs as administrator and run the same line in debug, I get the following error: System.Runtime.InteropServices.COMException Operation unavailable (Exception from HRESULT: 0x800401E3 (MK_E_UNAVAILABLE)) How can I fix this. I would guess that you are running Visual Studio as Administrator (started via Run as Administrator) while Outlook was opened as user, who was logged in as under Windows logon. So the Visual Studio is running under