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Just when you thought there wasn't anything new that you could do with a webcam, along comes this article, which shows you how to exploit the AVICap Windows class so you can integrate on-demand screen captures into your applications.

This article describes how to use DirectShow.NET. DirectShow.NET is a dll to use DirectShow as managed code. I found it hard to find examples for using DirectShow. I still didn't find out how that all works. That is why I translated a C# example of DirectShow.NET to VB.NET code..

There are several ways to grab and process webcamera images: WIA, DirectShow, VFW... There are lots of C# VFW examples on the internet and most of them use .NET clipboard to transfer each frame's data from buffer to Bitmap-recognizable object. Unfortunately, this makes multithreading unavailable and reduces FPS (frames per second). The native Win32 clipboard and multithreading solve the speed problem, but I thought that it wasn't the most elegant solution and there should be another way to get frames from Avicap. I have referred to MSDN (see VFW link above) and discovered that function callback was available. This article explains, step-by-step, how to capture frames using avicap32.dll (VFW) in a multi-thread environment..