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.NET Shell Extensions - Shell Drop Handlers

, 19 Jan 2013 CPOL
Rapidly create Shell Drop Handler Extensions using .NET
SharpShell.dll
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
ServerInspector.csproj.vspscc
Servers
ServerManager
About
LogView
Properties
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
ShellExtensionManager.csproj.vspscc
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.ComponentModel;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Text;
using SharpShell.Diagnostics;
using SharpShell.Interop;

namespace SharpShell.NativeBridge
{
    /// <summary>
    /// The NativeBridge is an object that wraps the functionality of the SharpShellNativeBridge
    /// library. It also automatically extracts the DLL from the manifest resources.
    /// </summary>
    public class NativeBridge
    {
        /// <summary>
        /// Initialises the Native Bridge.
        /// </summary>
        /// <returns>True if the initialisation succeeded, otherwise false.</returns>
        public bool Initialise()
        {
            //  Get the manifest resource name.
            var resouceName = GetBridgeManifestResourceName();

            //  We'll now try and get the bridge library path.
            string bridgeLibraryPath = string.Empty;

            try
            {
                //  Get the manifest resource stream.
                using (var resourceStream = Assembly.GetExecutingAssembly().GetManifestResourceStream(resouceName))
                {
                    //  Set the temporary path..
                    bridgeLibraryPath = Path.GetTempPath() + Guid.NewGuid().ToString() + ".dll";
                    using (var tempStream = File.Create(bridgeLibraryPath))
                    {
                        resourceStream.CopyTo(tempStream);
                    }

                    Logging.Log("SANITY A");
                    Logging.Log("Native Bridge: Wrote to " + bridgeLibraryPath);
                }
                Logging.Log("SANITY B");
            }
            catch (Exception exception)
            {
                //  Log the exception.
                Logging.Error("NativeBridge: Failed to extract the bridge library. The manifest path is '" +
                              bridgeLibraryPath + "'", exception);
                return false;
            }
            Logging.Log("SANITY C");

            //  Load the bridge library.
            try
            {
                Logging.Log("Loading bridge");
                libraryHandle = Kernel32.LoadLibrary(bridgeLibraryPath);
                Logging.Log("Loaded bridge");
            }
            catch (Exception exception)
            {
                //  Log the exception.
                Logging.Error("NativeBridge: Exception loading the bridge library.", exception);
            }

            //  If the library hasn't been loaded, log the last windows error.
            if (libraryHandle == IntPtr.Zero)
            {
                Logging.Error("NativeBridge: Failure to load the brige library.",
                              new Win32Exception(Marshal.GetLastWin32Error()));
                return false;
            }

            Logging.Log("Bridge Initialised");

            //  We've successfully loaded the bridge library.
            return true;
        }

        /// <summary>
        /// Calls the add prop sheet page.
        /// </summary>
        /// <param name="pAddPropSheet">The p add prop sheet.</param>
        /// <param name="hProp">The h prop.</param>
        /// <param name="lParam">The l param.</param>
        /// <returns></returns>
        public int CallAddPropSheetPage(IntPtr pAddPropSheet, IntPtr hProp, IntPtr lParam)
        {
            //  Get the proc address.
            var procAddress = Kernel32.GetProcAddress(libraryHandle, "CallAddPropSheetPage");

            //  Try and cast the proc, then call it.
            try
            {
                var callAddPropSheet = (CallAddPropSheetPageDelegate) Marshal.GetDelegateForFunctionPointer(
                    procAddress, typeof (CallAddPropSheetPageDelegate));
                return callAddPropSheet(pAddPropSheet, hProp, lParam);
            }
            catch (Exception exception)
            {
                //  Log the exception and fail.
                Logging.Error(
                    "NativeBridge: Failed to either load the proc (address is '" + procAddress.ToString("x8") +
                    "'), marshal it or call it.", exception);
                return 0;
            }
        }
        
        public IntPtr GetProxyHostTemplate()
        {
            //  Get the proc address.
            var procAddress = Kernel32.GetProcAddress(libraryHandle, "GetProxyHostTemplate");

            //  Try and cast the proc, then call it.
            try
            {
                var proc = (GetProxyHostTemplateDelegate)Marshal.GetDelegateForFunctionPointer(
                    procAddress, typeof(GetProxyHostTemplateDelegate));
                return proc();
            }
            catch (Exception exception)
            {
                //  Log the exception and fail.
                Logging.Error(
                    "NativeBridge: Failed to either load the proc (address is '" + procAddress.ToString("x8") +
                    "'), marshal it or call it.", exception);
                return IntPtr.Zero;
            }
        }


        /// <summary>
        /// Deinitialises this instance.
        /// </summary>
        public void Deinitialise()
        {
            //  Free the library.
            Kernel32.FreeLibrary(libraryHandle);
        }

        /// <summary>
        /// Gets the name of the bridge manifest resource.
        /// </summary>
        /// <returns>The name of the bridge manifest resource.</returns>
        private static string GetBridgeManifestResourceName()
        {
            //  Create the name of the bridge manifest.
            return string.Format("{0}.NativeBridge.SharpShellNativeBridge{1}.dll",
                                 Assembly.GetExecutingAssembly().GetName().Name,
                                 Environment.Is64BitOperatingSystem ? "64" : "32");
        }

        /// <summary>
        /// Gets the instance handle.
        /// </summary>
        /// <returns>The Instance Handle.</returns>
        public IntPtr GetInstanceHandle()
        {
            return libraryHandle;
        }
        
        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        private delegate int CallAddPropSheetPageDelegate(IntPtr lpfnAddPage, IntPtr hProp, IntPtr lParam);

        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        private delegate IntPtr GetProxyHostTemplateDelegate();

        [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        private delegate void CreatePropertySheetDelegate(ref PROPSHEETHEADER header);

        private IntPtr libraryHandle;

        internal void CreatePropertySheet(ref PROPSHEETHEADER psh)
        { //  Try and cast the proc, then call it.
            var procAddress = Kernel32.GetProcAddress(libraryHandle, "CreatePropertySheet");
            try
            {
                var proc = (CreatePropertySheetDelegate)Marshal.GetDelegateForFunctionPointer(
                    procAddress, typeof(CreatePropertySheetDelegate));
                proc(ref psh);
            }
            catch (Exception exception)
            {
                //  Log the exception and fail.
                Logging.Error(
                    "NativeBridge: Failed to either load the proc (address is '" + procAddress.ToString("x8") +
                    "'), marshal it or call it.", exception);
            }
        }
    }
}

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License

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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