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.NET Shell Extensions - Shell Drop Handlers

, 19 Jan 2013
Rapidly create Shell Drop Handler Extensions using .NET
SharpShell_Core_Library.zip
SharpShell.dll
SharpShell_Source_Code.zip
SharpShell Source Code
Dependencies
Apex
Apex.WinForms.dll
SharpShell
packages
Apex.1.5.0
Apex.1.5.0.nupkg
lib
net35
Apex.dll
net40
Apex.dll
sl30
Apex.Silverlight.dll
sl3-wp
Apex.WP7.dll
sl40
Apex.Silverlight4.dll
sl4-wp71
Apex.WP7.dll
sl50
Apex.Silverlight.dll
NUnit.2.6.2
lib
nunit.framework.dll
NUnit.2.6.2.nupkg
Samples
ContextMenu
CountLinesExtension
CountLinesExtension.csproj.vspscc
Key.snk
Properties
Resources
CountLines.bmp
DropHandler
XsdDropHandler
ExampleFiles
Key.snk
Properties
XsdDropHandler.csproj.vspscc
IconHandler
DllIconHandler
DllIconHandler.csproj.vspscc
Key.snk
Properties
Resources
ManagedDll.ico
NativeDll.ico
IconOverlayHandler
ReadOnlyFileIconOverlayHandler
Key.snk
Properties
ReadOnlyFileIconOverlayHandler.csproj.vspscc
Resources
ReadOnly.ico
InfoTipHandler
FolderInfoTipHandler
FolderInfoTipHandler.csproj.vspscc
Key.snk
Properties
PropertySheet
DrivePropertySheet
DrivePropertySheet.csproj.vspscc
Key.snk
Properties
TextFilePropertySheet
Key.snk
Properties
TextFilePropertySheet.csproj.vspscc
SharpShell
Attributes
Diagnostics
Extensions
Interop
Key.snk
NativeBridge
SharpShellNativeBridge32.dll
SharpShellNativeBridge64.dll
Properties
ServerRegistration
SharpContextMenu
SharpDropHandler
SharpIconHandler
SharpIconOverlayHandler
SharpInfoTipHandler
SharpPropertySheet
SharpShell.csproj.vspscc
SharpShellNativeBridge
SharpShellNativeBridge.vcxproj.filters
SharpShellNativeBridge.vcxproj.user
SharpShellNativeBridge.vcxproj.vspscc
Tools
ServerInspector
Properties
Settings.settings
ServerInspector.csproj.vspscc
Servers
ServerManager
About
LogView
Properties
Settings.settings
Resources
ChangeYourView.png
ContextMenu.png
Icon.png
openHS.png
PlayHS.png
PropertySheet.png
View_Details.png
View_LargeIcons.png
View_List.png
View_SmallIcons.png
View_Tiles.png
ServerDetails
ServerManager.csproj.vspscc
SharpShell.ico
TestShell
ShellExtensionManager
Properties
Settings.settings
ShellExtensionManager.csproj.vspscc
SharpShell_Tools.zip
SharpShell Tools
Apex.dll
Apex.WinForms.dll
ServerInspector.exe
ServerManager.exe
SharpShell.dll
System.Windows.Interactivity.dll
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;

namespace SharpShell.Interop
{
    internal static class User32
    {
        [DllImport("user32.dll")]
        internal static extern bool InsertMenuItem(IntPtr hMenu, uint uItem, bool fByPosition,
           [In] ref MENUITEMINFO lpmii);

        [DllImport("user32.dll")]
        internal static extern IntPtr CreatePopupMenu();

        [DllImport("user32.dll", SetLastError = true)] // SETLAST by us
        internal static extern int SetParent(IntPtr hWndChild, IntPtr hWndNewParent);

        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
        internal static extern bool SetWindowText(IntPtr hwnd, String lpString);

        [DllImport("user32.dll")]
        internal static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);

        [DllImport("user32.dll")]
        internal static extern int GetWindowLong(IntPtr hWnd, int nIndex);
        
        [DllImport("user32.dll")]
        internal static extern int SendMessage(IntPtr hWnd, uint Msg, uint wParam, IntPtr lParam);

        [DllImport("user32.dll")]
        internal static extern int SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);

        /// <summary>
        /// Retrieves a handle to the specified window's parent or owner.
        /// </summary>
        /// <param name="hWnd">A handle to the window whose parent window handle is to be retrieved.</param>
        /// <returns>If the window is a child window, the return value is a handle to the parent window. If the window is a top-level window with the WS_POPUP style, the return value is a handle to the owner window. If the function fails, the return value is NULL. To get extended error information, call GetLastError.</returns>
        [DllImport("user32.dll", SetLastError = true)]
        internal static extern IntPtr GetParent(IntPtr hWnd);
        
        public static int GWL_STYLE = -16;
        public static int WS_CHILD = 0x40000000; 


        public static int HighWord(int number)
        {
            return ((number & 0x80000000) == 0x80000000) ?
                (number >> 16) : ((number >> 16) & 0xffff);
        }

        public static int LowWord(int number)
        {
            return number & 0xffff;
        }
    }
}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Dave Kerr
Software Developer
United Kingdom United Kingdom
Follow my blog at www.dwmkerr.com and find out about my charity at www.childrenshomesnepal.org.
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Web04 | 2.8.140916.1 | Last Updated 19 Jan 2013
Article Copyright 2013 by Dave Kerr
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