This program will create a very simple window that just says Hello but it does using just the Windows GUI API in C#.

This article provides a simple sample of an application that clicks a button in another application.

In this blog I create a COM application for Amazon Marketplace Web Services (Amazon MWS).

In this Blog you will see Split worksheets to individual Excel files using Interop.

COM+ Uninstallation at runtime.

This blog shows on how to do a COM+ Installation at runtime.

Component Object Model (COM) is a method to facilitate communication between different applications and languages.

In this article we are going to explore the Speech API library that’s part of the TTS SDK that helps you reading text and speaking it. We’re going to see how to do it programmatically using C# and VB.NET and how to make use of LINQ to make it more interesting. The last part of this article talks about…… won’t tell you more, let’s see!

This is the last article in this series, it talks about unmanaged code interoperation; that’s, interop between .NET code and other code from other technologies (like Windows API, native libraries, COM, ActiveX, etc.)Be prepared!

Video AR001 Arabic Interoperability - 01 Introduction

1. Aggregation is the reuse mechanism, in which the outer object exposes interfaces from the inner object as if they were implemented on the outer object itself. This is useful when the outer object would always delegate every call to one of its interfaces to the same interface in the inner object. Aggregation is actually a specialized case of containment/delegation, and is available as a convenience to avoid extra implementation overhead in the outer object in these cases. We can get a pointer to the inner interface, calling QueryInterface of the outer object with IID of the inner interface.

1. Well, it all depends on your project. Start your answer from CoCreateInstance or CoCreateInstanceEx, explain the difference between them. If interviewer is still not satisfied, you’ll have to explain the whole kitchen behind the scenes, including a difference between local server and inproc server, meaning and mechanism of class factory, etc. You may also mention other methods of object creation like CoGetInstanceFromFile, but discussion will likely turn to discussion of monikers then.

Return E_NOINTERFACE and nullify its out parameter.

AddRef increments reference count of the object, Release decrements reference counter of the object and QueryInterface obtains a pointer to the requested interface.

1. It is a generally good idea to have an answer for this question if you claim you know COM in your resume. Otherwise, you may consider your interview failed at this point. IUnknown is the base interface of COM. All other interfaces must derive directly or indirectly from IUnknown. There are three methods in that interface: AddRef, Release and QueryInterface.