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Posted 17 Sep 2007

Webcamera, Multithreading and VFW

, 15 Feb 2008 CPOL
An article on webcamera frame-grabbing in a multi-thread environment
using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;

namespace SevenZ.WebCamera
   public class Device
      public string Name;
      public string Version;

      public Device(string name, string version)
         this.Name = name; this.Version = version;

      public override string ToString()
         return Name + "  " + Version;

   public class WebCameraDeviceManager
      static extern bool capGetDriverDescription(int wDriverIndex,
          [MarshalAs(UnmanagedType.VBByRefStr)]ref String lpszName,
          int cbName, [MarshalAs(UnmanagedType.VBByRefStr)] ref String lpszVer, int cbVer);
      List<Device> devices = new List<Device>(10);

      public WebCameraDeviceManager()

      public void Refresh()
         string name = "".PadRight(100), version = "".PadRight(100);

         for (int i = 0; i < 10; i++)
            if (capGetDriverDescription(i, ref name, 100, ref version, 100))
               Device d = new Device(name,version);
               d.Name = name.Trim();
               d.Version = version.Trim();

      public Device Device(int index)
         return devices[index];

      public Device[] Devices
         get { return devices.ToArray(); }

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About the Author

Zaur Nasibov
Software Developer
Finland Finland
I'm a Master degree student, studying at the University of Joensuu, Finland.

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