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.NET Shell Extensions - Shell Preview Handlers

, 20 May 2014
Quickly create Shell Preview Handlers for Windows or Outlook 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
ILMerge.2.12.0803
ILMerge.2.12.0803.nupkg
ILMerge.doc
ILMerge.exe
NUnit.2.6.2
lib
nunit.framework.dll
NUnit.2.6.2.nupkg
NUnit.2.6.2.nuspec
Samples
ContextMenu
ContextMenuComponent
Properties
ContextMenuSample
Properties
CountLinesExtension
CountLinesExtension.csproj.vspscc
Key.snk
Properties
Resources
CountLines.bmp
DllContextMenuExtension
DllContextMenuExtension.csproj.vspscc
Key.snk
Properties
IsolatedContextMenuComponent
Diagnostics
Interop
Properties
ServerRegistration
SharpContextMenu
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
PreviewHandler
IconPreviewHandler
Dependencies
IconLib.dll
IconLib.dll
IconPreviewHandler.csproj.user
IconPreviewHandler.csproj.vspscc
Key.snk
Properties
PropertySheet
DrivePropertySheet
DrivePropertySheet.csproj.vspscc
Key.snk
Properties
ResourcesPropertySheet
Key.snk
Properties
ResourcesPropertySheet.csproj.vspscc
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
SharpPreviewHandler
SharpPropertySheet
SharpShell.csproj.user
SharpShell.csproj.vspscc
SharpShellNativeBridge
SharpShellNativeBridge.aps
SharpShellNativeBridge.vcxproj.filters
SharpShellNativeBridge.vcxproj.user
SharpShellNativeBridge.vcxproj.vspscc
SharpShellNativeBridge1.aps
Tools
ExtensionManager
Properties
Settings.settings
Resources
xsd.ico
ServerInspector
Properties
Settings.settings
ServerInspector.csproj.vspscc
Servers
ServerManager
About
LogView
Properties
Settings.settings
Resources
ChangeYourView.png
ContextMenu.png
Icon.png
IconOverlayHandler.png
InfoTip.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.user
ServerManager.csproj.vspscc
SharpShell.ico
TestShell
ShellExtensionManager
Properties
Settings.settings
ShellExtensionManager.csproj.vspscc
SharpShell_Tools.zip
SharpShell.dll
Apex.WinForms.dll
ServerManager.exe
Apex.dll
ServerInspector.exe
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;
            }
        }

        /// <summary>
        /// Gets the proxy host template.
        /// </summary>
        /// <returns>The pointer to the proxy host template.</returns>
        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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This article, along with any associated source code and files, is licensed under The MIT License

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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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