IDeskBand2实现崩溃

Question

我已经为实现IDeskBand2的未来项目创建了示例模板。

gacuti和regasm的注册有效，它也显示在工具栏中。 如果我想显示/执行它，资源管理器将崩溃。

对于创建，我使用了Mircosoft和pinvoke的文档。

我将我的项目与media-control-deskband进行了比较，并尝试了一些方法（项目中的COMInterop文件，比较代码等），但找不到原因，猜测是由于错误的实现。

这是我的实现。

IDeskBand2接口：

/// <summary>
/// Gets information about a band object.
/// </summary>
[ComImport]
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
[Guid("EB0FE172-1A3A-11D0-89B3-00A0C90A90AC")]
public interface IDeskBand : IDockingWindow
{
    /// <summary>
    /// Gets state information for a band object.
    /// </summary>
    /// <param name="dwBandID">The identifier of the band, assigned by the container. The band object can retain this value if it is required.</param>
    /// <param name="dwViewMode">The view mode of the band object. One of the following values: DBIF_VIEWMODE_NORMAL, DBIF_VIEWMODE_VERTICAL, DBIF_VIEWMODE_FLOATING, DBIF_VIEWMODE_TRANSPARENT.</param>
    /// <param name="pdbi">Pointer to a DESKBANDINFO structure that receives the band information for the object. The dwMask member of this structure indicates the specific information that is being requested.</param>
    /// <returns></returns>
    [PreserveSig]
    int GetBandInfo(UInt32 dwBandID, DeskBandInfoViewMode dwViewMode, ref DESKBANDINFO pdbi);
}


/// <summary>
/// Exposes methods to enable and query translucency effects in a deskband object.
/// </summary>
[ComImport]
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
[Guid("79D16DE4-ABEE-4021-8D9D-9169B261D657")]
public interface IDeskBand2 : IDeskBand
{
    /// <summary>
    /// Indicates the deskband's ability to be displayed as translucent.
    /// </summary>
    /// <param name="pfCanRenderComposited">When this method returns, contains a BOOL indicating ability.</param>
    /// <returns>If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.</returns>
    [PreserveSig]
    int CanRenderComposited(out bool pfCanRenderComposited);

    /// <summary>
    /// Gets the composition state.
    /// </summary>
    /// <param name="pfCompositionEnabled">When this method returns, contains a BOOL that indicates state.</param>
    /// <returns>If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.</returns>
    [PreserveSig]
    int GetCompositionState(out bool pfCompositionEnabled);

    /// <summary>
    /// Sets the composition state.
    /// </summary>
    /// <param name="fCompositionEnabled">TRUE to enable the composition state; otherwise, FALSE.</param>
    /// <returns>If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.</returns>
    [PreserveSig]
    int SetCompositionState(bool fCompositionEnabled);
}

使用的IDeskBand2 ：（ GetBandInfo函数已经过测试，可以正常工作。）

    /// <summary>
/// Basic class for a DeskBand object
/// </summary>
/// <example>
/// [Guid("00000000-0000-0000-0000-000000000000")]
/// [DeskBandInfo("Beispiel Erweiterung", "Diese ist eine Beispiel Erweiterung für die Taskleiste.")]
/// public class SampleExtension : DeskBand
/// { /*...*/ }
/// </example>
public class DeskBand : UserControl, IDeskBand2
{
    #region Constants

    private const int S_OK = 0;
    private const int E_NOTIMPL = unchecked((int)0x80004001);

    #endregion

    #region Properties

    /// <summary>
    /// Title of the band object, displayed by default on the left or top of the object.
    /// </summary>
    [Browsable(true)]
    [DefaultValue("")]
    public String Title { get; set; }

    /// <summary>
    /// Minimum size of the band object. Default value of -1 sets no minimum constraint.
    /// </summary>
    [Browsable(true)]
    [DefaultValue(typeof(Size), "-1,-1")]
    public Size MinSize { get; set; }

    /// <summary>
    /// Maximum size of the band object. Default value of -1 sets no maximum constraint.
    /// </summary>
    [Browsable(true)]
    [DefaultValue(typeof(Size), "-1,-1")]
    public Size MaxSize { get; set; }

    /// <summary>
    /// Minimum vertical size of the band object. Default value of -1 sets no maximum constraint. (Used when the taskbar is aligned horinzortal.)
    /// </summary>
    [Browsable(true)]
    [DefaultValue(typeof(Size), "-1,-1")]
    public Size MinSizeVertical { get; set; }

    /// <summary>
    /// Says that band object's size must be multiple of this size. Defauilt value of -1 does not set this constraint.
    /// </summary>
    [Browsable(true)]
    [DefaultValue(typeof(Size), "-1,-1")]
    public Size IntegralSize { get; set; }

    #endregion

    #region IDeskBand2

    public virtual int CanRenderComposited(out bool pfCanRenderComposited)
    {
        pfCanRenderComposited = true;
        return S_OK;
    }

    public int GetCompositionState(out bool pfCompositionEnabled)
    {
        pfCompositionEnabled = false;
        return S_OK;
    }

    public int SetCompositionState(bool fCompositionEnabled)
    {
        fCompositionEnabled = true;
        return S_OK;
    }

    public int GetBandInfo(uint dwBandID, DeskBandInfoViewMode dwViewMode, ref DESKBANDINFO pdbi)
    {
        if (pdbi.dwMask.HasFlag(DeskBandInfoMasks.DBIM_MINSIZE))
        {
            // Support for a vertical taskbar
            // Most examples have no support for a vertical taskbar. Who in hell uses their taskbar vertically? Me! Very practical on a 21:9 monitor.
            if (dwViewMode.HasFlag(DeskBandInfoViewMode.DBIF_VIEWMODE_FLOATING) || dwViewMode.HasFlag(DeskBandInfoViewMode.DBIF_VIEWMODE_VERTICAL))
            {
                pdbi.ptMinSize.Y = this.MinSizeVertical.Width;
                pdbi.ptMinSize.X = this.MinSizeVertical.Height;
            }
            else
            {
                pdbi.ptMinSize.X = this.MinSize.Width;
                pdbi.ptMinSize.Y = this.MinSize.Height;
            }
        }
        if (pdbi.dwMask.HasFlag(DeskBandInfoMasks.DBIM_MAXSIZE))
        {
            if (dwViewMode.HasFlag(DeskBandInfoViewMode.DBIF_VIEWMODE_FLOATING) || dwViewMode.HasFlag(DeskBandInfoViewMode.DBIF_VIEWMODE_VERTICAL))
            {
                pdbi.ptMaxSize.Y = this.MaxSize.Width;
                pdbi.ptMaxSize.X = this.MaxSize.Height;
            }
            else
            {
                pdbi.ptMaxSize.X = this.MaxSize.Width;
                pdbi.ptMaxSize.Y = this.MaxSize.Height;
            }
        }
        if (pdbi.dwMask.HasFlag(DeskBandInfoMasks.DBIM_INTEGRAL))
        {
            if (dwViewMode.HasFlag(DeskBandInfoViewMode.DBIF_VIEWMODE_FLOATING) || dwViewMode.HasFlag(DeskBandInfoViewMode.DBIF_VIEWMODE_VERTICAL))
            {
                pdbi.ptIntegral.Y = this.IntegralSize.Width;
                pdbi.ptIntegral.X = this.IntegralSize.Height;
            }
            else
            {
                pdbi.ptIntegral.X = this.IntegralSize.Width;
                pdbi.ptIntegral.Y = this.IntegralSize.Height;
            }
        }

        if (pdbi.dwMask.HasFlag(DeskBandInfoMasks.DBIM_ACTUAL))
        {
            if (dwViewMode.HasFlag(DeskBandInfoViewMode.DBIF_VIEWMODE_FLOATING) || dwViewMode.HasFlag(DeskBandInfoViewMode.DBIF_VIEWMODE_VERTICAL))
            {
                pdbi.ptActual.Y = this.Size.Width;
                pdbi.ptActual.X = this.Size.Height;
            }
            else
            {
                pdbi.ptActual.X = this.Size.Width;
                pdbi.ptActual.Y = this.Size.Height;
            }
        }

        if (pdbi.dwMask.HasFlag(DeskBandInfoMasks.DBIM_TITLE))
        {
            pdbi.wszTitle = this.Title;
        }

        pdbi.dwModeFlags = DeskBandInfoModeFlag.DBIMF_ALWAYSGRIPPER | DeskBandInfoModeFlag.DBIMF_NORMAL | DeskBandInfoModeFlag.DBIMF_VARIABLEHEIGHT;
        pdbi.dwMask = pdbi.dwMask | DeskBandInfoMasks.DBIM_BKCOLOR | DeskBandInfoMasks.DBIM_TITLE; // Testen

        return S_OK;
    }

    public int CloseDW([In] uint dwReserved)
    {
        Dispose(true);
        return S_OK;
    }

    public int ResizeBorderDW(IntPtr prcBorder, [In, MarshalAs(UnmanagedType.IUnknown)] object punkToolbarSite, bool fReserved)
    {
        return E_NOTIMPL;
    }

    public int ShowDW([In] bool fShow)
    {
        if (fShow)
            Show();
        else
            Hide();

        return S_OK;
    }

    public int GetWindow(out IntPtr phwnd)
    {
        phwnd = Handle;
        return S_OK;
    }

    public int ContextSensitiveHelp(bool fEnterMode)
    {
        return S_OK;
    }

    #endregion

    #region COM

    [ComRegisterFunctionAttribute]
    public static void Register(Type t)
    {
        string guid = t.GUID.ToString("B");

        RegistryKey rkClass = Registry.ClassesRoot.CreateSubKey(@"CLSID\" + guid);
        RegistryKey rkCat = rkClass.CreateSubKey("Implemented Categories");

        DeskBandInfoAttribute[] deskBandInfo = (DeskBandInfoAttribute[])
            t.GetCustomAttributes(typeof(DeskBandInfoAttribute), false);

        string _displayName = t.Name;
        string _helpText = t.Name;

        if (deskBandInfo.Length == 1)
        {
            if (deskBandInfo[0].DisplayName != null)
            {
                _displayName = deskBandInfo[0].DisplayName;
            }

            if (deskBandInfo[0].HelpText != null)
            {
                _helpText = deskBandInfo[0].HelpText;
            }
        }

        rkClass.SetValue(null, _displayName);
        rkClass.SetValue("MenuText", _displayName);
        rkClass.SetValue("HelpText", _helpText);

        // TaskBar
        rkCat.CreateSubKey("{00021492-0000-0000-C000-000000000046}");
    }

    [ComUnregisterFunctionAttribute]
    public static void Unregister(Type t)
    {
        string guid = t.GUID.ToString("B");

        DeskBandInfoAttribute[] deskBandInfo = (DeskBandInfoAttribute[])
            t.GetCustomAttributes(typeof(DeskBandInfoAttribute), false);

        Registry.ClassesRoot.CreateSubKey(@"CLSID").DeleteSubKeyTree(guid);
    }

    #endregion

    public DeskBand()
    {
        InitializeComponent();
    }

    private void InitializeComponent()
    {
        this.Name = "DeskBand";
    }
}
}

不含Designer代码的实际扩展名：

namespace TaskbarSampleExt
{
    [Guid("2D53D9CC-0288-4511-A387-B330044C63EA")]
    [DeskBandInfo("Beispiel Erweiterung", "Diese ist eine Beispiel Erweiterung für die Taskleiste.")]
    public partial class SampleExtension : DeskBand
    {

        public SampleExtension()
        {
            this.MinSize = new Size(90, 40);
            this.MinSizeVertical = new Size(90, 40);
            this.Title = "Beispiel Erweiterung";

            InitializeComponent();
        }

    }
}

感谢您的时间

碎文件

Answer 1

您没有正确复制/粘贴原始代码。

在.NET中，当您从IDeskBand声明派生接口（例如IDeskBand2）时， 必须重新声明基本接口的所有方法（当然，可以递归地省略IUnknown）。

像这样（如果您希望派生出现在.NET中）：

public interface IDeskBand2 : IDeskBand
{
    // IOleWindow
    new int GetWindow(out IntPtr phwnd);
    new int ContextSensitiveHelp(bool fEnterMode);

    // IDockingWindow
    new int ShowDW(bool bShow);
    new int CloseDW(UInt32 dwReserved);
    new int ResizeBorderDW(RECT rcBorder, IntPtr punkToolbarSite, bool fReserved);

    // IDeskBand
    new int GetBandInfo(UInt32 dwBandID, DESKBANDINFO.DBIF dwViewMode, ref DESKBANDINFO pdbi);

    // IDeskBand2
    int CanRenderComposited(out bool pfCanRenderComposited);
    ....
}

或者只是这样：

public interface IDeskBand2
{
    // IOleWindow
    int GetWindow(out IntPtr phwnd);
    int ContextSensitiveHelp(bool fEnterMode);

    // IDockingWindow
    int ShowDW(bool bShow);
    int CloseDW(UInt32 dwReserved);
    int ResizeBorderDW(RECT rcBorder, IntPtr punkToolbarSite, bool fReserved);

    // IDeskBand
    int GetBandInfo(UInt32 dwBandID, DESKBANDINFO.DBIF dwViewMode, ref DESKBANDINFO pdbi);

    // IDeskBand2
    int CanRenderComposited(out bool pfCanRenderComposited);
    ....
}