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.NET Shell Extensions - Shell Drop Handlers

, 19 Jan 2013 CPOL
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
bin
CountLinesExtension.csproj.vspscc
Key.snk
Properties
Resources
CountLines.bmp
DropHandler
XsdDropHandler
bin
ExampleFiles
Key.snk
Properties
XsdDropHandler.csproj.vspscc
IconHandler
DllIconHandler
bin
DllIconHandler.csproj.vspscc
Key.snk
Properties
Resources
ManagedDll.ico
NativeDll.ico
IconOverlayHandler
ReadOnlyFileIconOverlayHandler
bin
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.Runtime.InteropServices;

namespace SharpShell.Interop
{
    /// <summary>
    /// Exposes methods for the display of rich previews.
    /// </summary>
    [ComImport]
    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    [Guid("8895b1c6-b41f-4c1c-a562-0d564250836f")]
    public interface IPreviewHandler
    {
        /// <summary>
        /// Sets the parent window of the previewer window, as well as the area within the parent to be used for the previewer window.
        /// </summary>
        /// <param name="hwnd">A handle to the parent window.</param>
        /// <param name="prc">A pointer to a RECT defining the area for the previewer.</param>
        /// <returns>If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.</returns>
        [PreserveSig]
        int SetWindow(IntPtr hwnd, RECT prc);

        /// <summary>
        /// Directs the preview handler to change the area within the parent hwnd that it draws into.
        /// </summary>
        /// <param name="prc">A pointer to a RECT to be used for the preview.</param>
        /// <returns>If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.</returns>
        [PreserveSig] 
        int SetRect(RECT prc);

        /// <summary>
        /// Directs the preview handler to load data from the source specified in an earlier Initialize method call, and to begin rendering to the previewer window.
        /// </summary>
        /// <returns>This method can return one of these values.</returns>
        [PreserveSig] 
        int DoPreview();

        /// <summary>
        /// Directs the preview handler to cease rendering a preview and to release all resources that have been allocated based on the item passed in during the initialization.
        /// </summary>
        /// <returns>If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.</returns>
        [PreserveSig] 
        int Unload();

        /// <summary>
        /// Directs the preview handler to set focus to itself.
        /// </summary>
        /// <returns>If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.</returns>
        [PreserveSig] 
        int SetFocus();

        /// <summary>
        /// Directs the preview handler to return the HWND from calling the GetFocus Function.
        /// </summary>
        /// <param name="phwnd">When this method returns, contains a pointer to the HWND returned from calling the GetFocus Function from the preview handler's foreground thread.</param>
        /// <returns>If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.</returns>
        [PreserveSig] 
        int QueryFocus(out IntPtr phwnd);

        /// <summary>
        /// Directs the preview handler to handle a keystroke passed up from the message pump of the process in which the preview handler is running.
        /// </summary>
        /// <param name="pmsg">A pointer to a window message.</param>
        /// <returns>If the keystroke message can be processed by the preview handler, the handler will process it and return S_OK. If the preview handler cannot process the keystroke message, it will offer it to the host using TranslateAccelerator. If the host processes the message, this method will return S_OK. If the host does not process the message, this method will return S_FALSE.</returns>
        [PreserveSig] 
        int TranslateAccelerator(MSG pmsg);
    };
}

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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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Article Copyright 2013 by Dave Kerr
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