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POIcon overlay in c#
 

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    <p>I beg your pardon, if its a silly question. But I really need to know how can I use the code I am posting below. I have copied it from a form. I want to implement folder/file icon overlay. So while searching, I found the below code. </p> <pre><code>public sealed class ShellInterop { private ShellInterop() { } [DllImport("shell32.dll")] public static extern void SHChangeNotify(int eventID, uint flags, IntPtr item1, IntPtr item2); } [ComVisible(false)] [ComImport] [Guid("0C6C4200-C589-11D0-999A-00C04FD655E1")] [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] public interface IShellIconOverlayIdentifier { [PreserveSig] int IsMemberOf([MarshalAs(UnmanagedType.LPWStr)]string path, uint attributes); [PreserveSig] int GetOverlayInfo( IntPtr iconFileBuffer, int iconFileBufferSize, out int iconIndex, out uint flags); [PreserveSig] int GetPriority(out int priority); } [ComVisible(true)] [Guid("B8FA9E43-38E6-4654-8A13-FF905AD22CE5")] public class MyIconOverlay : IShellIconOverlayIdentifier { #region IShellIconOverlayIdentifier Members public int IsMemberOf(string path, uint attributes) { //Show everything with icon overlay return 0; // S_OK } public int GetOverlayInfo(IntPtr iconFileBuffer, int iconFileBufferSize, out int iconIndex, out uint flags) { System.Diagnostics.Debug.WriteLine(string.Format("GetOverlayInfo::{0}", iconFileBuffer)); System.Diagnostics.Debug.WriteLine(string.Format("GetOverlayInfo::{0}", iconFileBufferSize)); string fname = @"c:\NormalIcon.ico"; int bytesCount = System.Text.Encoding.Unicode.GetByteCount(fname); System.Diagnostics.Debug.WriteLine(string.Format("GetOverlayInfo::{0}", bytesCount)); byte[] bytes = System.Text.Encoding.Unicode.GetBytes(fname); if (bytes.Length + 2 &lt; iconFileBufferSize) { for (int i = 0; i &lt; bytes.Length; i++) { Marshal.WriteByte(iconFileBuffer, i, bytes[i]); } //write the "\0\0" Marshal.WriteByte(iconFileBuffer, bytes.Length, 0); Marshal.WriteByte(iconFileBuffer, bytes.Length + 1, 0); } iconIndex = 0; flags = 1; // ISIOI_ICONFILE return 0; // S_OK } public int GetPriority(out int priority) { priority = 0; // 0-100 (0 is highest priority) return 0; // S_OK } #endregion #region Registry [ComRegisterFunction] public static void Register(Type t) { RegistryKey rk = Registry.LocalMachine.CreateSubKey(@"SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\ShellIconOverlayIdentifiers\_" + t.Name); rk.SetValue(string.Empty, t.GUID.ToString("B").ToUpper()); rk.Close(); ShellInterop.SHChangeNotify(0x08000000, 0, IntPtr.Zero, IntPtr.Zero); } [ComUnregisterFunction] public static void Unregister(Type t) { Registry.LocalMachine.DeleteSubKeyTree(@"SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\ShellIconOverlayIdentifiers\_" + t.Name); ShellInterop.SHChangeNotify(0x08000000, 0, IntPtr.Zero, IntPtr.Zero); } #endregion } </code></pre> <p>Please if anyone can explain it to me. I have a situation, where I have to implement icon overlay for files and folder that a user creates under a special folder.</p> <p>Thanks</p>
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    1. USDeepak Kumar
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    1. COWhat parts of the code don't you understand?
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      1. USAlbin Sunnanbo
    2. COI just want to know, how can I use this code to implement icon overlay? I mean, i have a special folder, and if I put any file or folder in that special folder, there should be a icon applied on each file/folder like in SVN. For this purpose, how can I use this code?
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      1. POIcon overlay in c#
      1. USDeepak Kumar
 

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