C# Winform WPF DeskBand 窗體嵌入任務欄，在任務欄顯示文字

来源:https://www.cnblogs.com/s0611163/archive/2017/12/29/8142913.html
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最近寫了個小程式，用於將固態硬碟的寫入量等信息顯示在任務欄，最開始使用Windows API也可以實現，但是當任務欄托盤增加的時候，會被遮蓋，最終採用了DeskBand來實現，填了很多坑。 參考的GitHub地址：https://github.com/dsafa/CSDeskBand DeskBan ...


    最近寫了個小程式，用於將固態硬碟的寫入量等信息顯示在任務欄，最開始使用Windows API也可以實現，但是當任務欄托盤增加的時候，會被遮蓋，最終採用了DeskBand來實現，填了很多坑。

    參考的GitHub地址：https://github.com/dsafa/CSDeskBand

    DeskBand相關代碼如下：

COLORREF：

// This code snippet was used by SharpShell.
//

using System.Drawing;
using System.Runtime.InteropServices;

namespace MyDiskInfo.Interop
{
    [StructLayout(LayoutKind.Sequential)]
    public struct COLORREF
    {
        public COLORREF(Color color)
        {
            Dword = (uint)color.R + (((uint)color.G) << 8) + (((uint)color.B) << 16);
        }

        public uint Dword;
        public Color Color
        {
            get
            {
                return Color.FromArgb(
                    (int)(0x000000FFU & Dword),
                    (int)(0x0000FF00U & Dword) >> 8,
                    (int)(0x00FF0000U & Dword) >> 16);
            }
        }
    }
}
View Code

DESKBANDINFO：

using System;
using System.Runtime.InteropServices;

namespace MyDiskInfo.Interop
{
    /// <summary>
    /// Receives information about a band object. This structure is used with the deprecated IDeskBand::GetBandInfo method.
    /// </summary>
    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
    public struct DESKBANDINFO
    {
        /// <summary>
        /// Set of flags that determine which members of this structure are being requested. 
        /// </summary>
        /// <remarks>
        /// This will be a combination of the following values:
        ///     DBIM_MINSIZE    ptMinSize is being requested.
        ///     DBIM_MAXSIZE    ptMaxSize is being requested.
        ///     DBIM_INTEGRAL   ptIntegral is being requested.
        ///     DBIM_ACTUAL     ptActual is being requested.
        ///     DBIM_TITLE      wszTitle is being requested.
        ///     DBIM_MODEFLAGS  dwModeFlags is being requested.
        ///     DBIM_BKCOLOR    crBkgnd is being requested.
        /// </remarks>
        public DBIM dwMask;

        /// <summary>
        /// Point structure that receives the minimum size of the band object. 
        /// The minimum width is placed in the x member and the minimum height 
        /// is placed in the y member. 
        /// </summary>
        public POINT ptMinSize;

        /// <summary>
        /// Point structure that receives the maximum size of the band object. 
        /// The maximum height is placed in the y member and the x member is ignored. 
        /// If there is no limit for the maximum height, (LONG)-1 should be used. 
        /// </summary>
        public POINT ptMaxSize;

        /// <summary>
        /// Point structure that receives the sizing step value of the band object. 
        /// The vertical step value is placed in the y member, and the x member is ignored. 
        /// The step value determines in what increments the band will be resized. 
        /// </summary>
        /// <remarks>
        /// This member is ignored if dwModeFlags does not contain DBIMF_VARIABLEHEIGHT. 
        /// </remarks>
        public POINT ptIntegral;

        /// <summary>
        /// Point structure that receives the ideal size of the band object. 
        /// The ideal width is placed in the x member and the ideal height is placed in the y member. 
        /// The band container will attempt to use these values, but the band is not guaranteed to be this size.
        /// </summary>
        public POINT ptActual;

        /// <summary>
        /// The title of the band.
        /// </summary>
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 255)]
        public String wszTitle;

        /// <summary>
        /// A value that receives a set of flags that define the mode of operation for the band object. 
        /// </summary>
        /// <remarks>
        /// This must be one or a combination of the following values.
        ///     DBIMF_NORMAL
        ///     The band is normal in all respects. The other mode flags modify this flag.
        ///     DBIMF_VARIABLEHEIGHT
        ///     The height of the band object can be changed. The ptIntegral member defines the 
        ///     step value by which the band object can be resized. 
        ///     DBIMF_DEBOSSED
        ///     The band object is displayed with a sunken appearance.
        ///     DBIMF_BKCOLOR
        ///     The band will be displayed with the background color specified in crBkgnd.
        /// </remarks>
        public DBIMF dwModeFlags;

        /// <summary>
        /// The background color of the band.
        /// </summary>
        /// <remarks>
        /// This member is ignored if dwModeFlags does not contain the DBIMF_BKCOLOR flag. 
        /// </remarks>
        public COLORREF crBkgnd;

        /// <summary>
        /// The view mode of the band object. This is one of the following values.
        /// </summary>
        [Flags]
        public enum DBIF
        {
            /// <summary>
            /// Band object is displayed in a horizontal band.
            /// </summary>
            DBIF_VIEWMODE_NORMAL = 0x0000,

            /// <summary>
            /// Band object is displayed in a vertical band.
            /// </summary>
            DBIF_VIEWMODE_VERTICAL = 0x0001,

            /// <summary>
            /// Band object is displayed in a floating band.
            /// </summary>
            DBIF_VIEWMODE_FLOATING = 0x0002,

            /// <summary>
            /// Band object is displayed in a transparent band.
            /// </summary>
            DBIF_VIEWMODE_TRANSPARENT = 0x0004
        }

        /// <summary>
        /// The set of flags that determine which members of this structure are being requested by the caller. One or more of the following values:
        /// </summary>
        [Flags]
        public enum DBIM
        {
            /// <summary>
            /// ptMinSize is requested.
            /// </summary>
            DBIM_MINSIZE = 0x0001,

            /// <summary>
            /// ptMaxSize is requested.
            /// </summary>
            DBIM_MAXSIZE = 0x0002,

            /// <summary>
            /// ptIntegral is requested.
            /// </summary>
            DBIM_INTEGRAL = 0x0004,

            /// <summary>
            /// ptActual is requested.
            /// </summary>
            DBIM_ACTUAL = 0x0008,

            /// <summary>
            /// wszTitle is requested.
            /// </summary>
            DBIM_TITLE = 0x0010,

            /// <summary>
            /// dwModeFlags is requested.
            /// </summary>
            DBIM_MODEFLAGS = 0x0020,

            /// <summary>
            /// crBkgnd is requested.
            /// </summary>
            DBIM_BKCOLOR = 0x0040
        }

        /// <summary>
        /// A value that receives a set of flags that specify the mode of operation for the band object. One or more of the following values:
        /// </summary>
        [Flags]
        public enum DBIMF : uint
        {
            /// <summary>
            /// The band uses default properties. The other mode flags modify this flag.
            /// </summary>
            DBIMF_NORMAL = 0x0000,

            /// <summary>
            /// Windows XP and later: The band object is of a fixed sized and position. With this flag, a sizing grip is not displayed on the band object.
            /// </summary>
            DBIMF_FIXED = 0x0001,

            /// <summary>
            /// DBIMF_FIXEDBMP
            /// Windows XP and later: The band object uses a fixed bitmap (.bmp) file as its background. Note that backgrounds are not supported in all cases, so the bitmap may not be seen even when this flag is set.
            /// </summary>
            DBIMF_FIXEDBMP = 0x0004,

            /// <summary>
            /// The height of the band object can be changed. The ptIntegral member defines the step value by which the band object can be resized.
            /// </summary>
            DBIMF_VARIABLEHEIGHT = 0x0008,

            /// <summary>
            /// Windows XP and later: The band object cannot be removed from the band container.
            /// </summary>
            DBIMF_UNDELETEABLE = 0x0010,

            /// <summary>
            /// The band object is displayed with a sunken appearance.
            /// </summary>
            DBIMF_DEBOSSED = 0x0020,

            /// <summary>
            /// The band is displayed with the background color specified in crBkgnd.
            /// </summary>
            DBIMF_BKCOLOR = 0x0040,

            /// <summary>
            /// Windows XP and later: If the full band object cannot be displayed (that is, the band object is smaller than ptActual, a chevron is shown to indicate that there are more options available. These options are displayed when the chevron is clicked.
            /// </summary>
            DBIMF_USECHEVRON = 0x0080,

            /// <summary>
            /// Windows XP and later: The band object is displayed in a new row in the band container.
            /// </summary>
            DBIMF_BREAK = 0x0100,

            /// <summary>
            /// Windows XP and later: The band object is the first object in the band container.
            /// </summary>
            DBIMF_ADDTOFRONT = 0x0200,

            /// <summary>
            /// Windows XP and later: The band object is displayed in the top row of the band container.
            /// </summary>
            DBIMF_TOPALIGN = 0x0400,

            /// <summary>
            /// Windows Vista and later: No sizing grip is ever displayed to allow the user to move or resize the band object.
            /// </summary>
            DBIMF_NOGRIPPER = 0x0800,

            /// <summary>
            /// Windows Vista and later: A sizing grip that allows the user to move or resize the band object is always shown, even if that band object is the only one in the container.
            /// </summary>
            DBIMF_ALWAYSGRIPPER = 0x1000,

            /// <summary>
            /// Windows Vista and later: The band object should not display margins.
            /// </summary>
            DBIMF_NOMARGINS = 0x2000
        }
    }
}
View Code

POINT：

// This code snippet was used by SharpShell.
//
using System.Runtime.InteropServices;

namespace MyDiskInfo.Interop
{
    /// <summary>
    /// The POINT structure defines the x- and y- coordinates of a point.
    /// </summary>
    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
    public struct POINT
    {
        /// <summary>
        /// The x-coordinate of the point.
        /// </summary>
        public int X;

        /// <summary>
        /// The y-coordinate of the point.
        /// </summary>
        public int Y;
    }
}
View Code

RECT：

using System.Runtime.InteropServices;

namespace MyDiskInfo.Interop
{
    [StructLayout(LayoutKind.Sequential)]
    public struct RECT
    {
        public RECT(int left, int top, int right, int bottom)
        {
            this.left = left;
            this.top = top;
            this.right = right;
            this.bottom = bottom;
        }


        public int left, top, right, bottom;

        public int Width()
        {
            return right - left;
        }

        public int Height()
        {
            return bottom - top;
        }

        public void Offset(int x, int y)
        {
            left += x;
            right += x;
            top += y;
            bottom += y;
        }

        public void Set(int left, int top, int right, int bottom)
        {
            this.left = left;
            this.top = top;
            this.right = right;
            this.bottom = bottom;
        }

        public bool IsEmpty()
        {
            return Width() == 0 && Height() == 0;
        }
    }
}
View Code

Attributes：

using System;
using System.Runtime.InteropServices;

namespace MyDiskInfo
{
    /// <summary>
    /// The display name of the extension and the description for the HelpText(displayed in status bar when menu command selected).
    /// </summary>
    [AttributeUsage(AttributeTargets.Class)]
    public class DeskBandInfoAttribute : System.Attribute
    {
        private string _displayName;
        private string _helpText;

        public string DisplayName
        {
            get { return _displayName; }
        }

        public string HelpText
        {
            get { return _helpText; }
        }

        public DeskBandInfoAttribute() { }

        public DeskBandInfoAttribute(string displayName, string helpText)
        {
            _displayName = displayName;
            _helpText = helpText;
        }
    }
}
View Code

ComImport：

using System;
using System.Runtime.InteropServices;

namespace MyDiskInfo.Interop
{
    /// <summary>
    /// Provides a simple way to support communication between an object and its site in the container.
    /// </summary>
    [ComImport]
    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    [Guid("FC4801A3-2BA9-11CF-A229-00AA003D7352")]
    public interface IObjectWithSite
    {
        /// <summary>
        /// Enables a container to pass an object a pointer to the interface for its site.
        /// </summary>
        /// <param name="pUnkSite">A pointer to the IUnknown interface pointer of the site managing this object.
        /// If NULL, the object should call Release on any existing site at which point the object no longer knows its site.</param>
        void SetSite([In, MarshalAs(UnmanagedType.IUnknown)] Object pUnkSite);

        /// <summary>
        /// Retrieves the latest site passed using SetSite.
        /// </summary>
        /// <param name="riid">The IID of the interface pointer that should be returned in ppvSite.</param>
        /// <param name="ppvSite">Address of pointer variable that receives the interface pointer requested in riid.</param>
        void GetSite(ref Guid riid, [MarshalAs(UnmanagedType.IUnknown)] out Object ppvSite);
    }

    /// <summary>
    /// Exposes a method that is used to communicate focus changes for a user input object contained in the Shell.
    /// </summary>
    [ComImport]
    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    [Guid("F1DB8392-7331-11D0-8C99-00A0C92DBFE8")]
    public interface IInputObjectSite
    {
        /// <summary>
        /// Informs the browser that the focus has changed.
        /// </summary>
        /// <param name="punkObj">The address of the IUnknown interface of the object gaining or losing the focus.</param>
        /// <param name="fSetFocus">Indicates if the object has gained or lost the focus. If this value is nonzero, the object has gained the focus.
        /// If this value is zero, the object has lost the focus.</param>
        /// <returns>Returns S_OK if the method was successful, or a COM-defined error code otherwise.</returns>
        [PreserveSig]
        Int32 OnFocusChangeIS([MarshalAs(UnmanagedType.IUnknown)] Object punkObj, Int32 fSetFocus);
    }

    /// <summary>
    /// The IOleWindow interface provides methods that allow an application to obtain the handle to the various windows that participate in in-place activation, and also to enter and exit context-sensitive help mode.
    /// </summary>
    [ComImport]
    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    [Guid("00000114-0000-0000-C000-000000000046")]
    public interface IOleWindow
    {
        /// <summary>
        /// Retrieves a handle to one of the windows participating in in-place activation (frame, document, parent, or in-place object window).
        /// </summary>
        /// <param name="phwnd">A pointer to a variable that receives the window handle.</param>
        /// <returns>This method returns S_OK on success.</returns>
        [PreserveSig]
        int GetWindow(out IntPtr phwnd);

        /// <summary>
        /// Determines whether context-sensitive help mode should be entered during an in-place activation session.
        /// </summary>
        /// <param name="fEnterMode">TRUE if help mode should be entered; FALSE if it should be exited.</param>
        /// <returns>This method returns S_OK if the help mode was entered or exited successfully, depending on the value passed in fEnterMode.</returns>
        [PreserveSig]
        int ContextSensitiveHelp(bool fEnterMode);
    }

    [ComImport]
    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    [Guid("012DD920-7B26-11D0-8CA9-00A0C92DBFE8")]
    public interface IDockingWindow : IOleWindow
    {
        #region IOleWindow

        [PreserveSig]
        new int GetWindow(out IntPtr phwnd);

        [PreserveSig]
        new int ContextSensitiveHelp(bool fEnterMode);

        #endregion

        /// <summary>
        /// Instructs the docking window object to show or hide itself.
        /// </summary>
        /// <param name="fShow">TRUE if the docking window object should show its window.
        /// FALSE if the docking window object should hide its window and return its border space by calling SetBorderSpaceDW with zero values.</param>
        /// <returns>If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.</returns>
        [PreserveSig]
        int ShowDW([In] bool fShow);

        /// <summary>
        /// Notifies the docking window object that it is about to be removed from the frame.
        /// The docking window object should save any persistent information at this time.
        /// </summary>
        /// <param name="dwReserved">Reserved. This parameter should always be zero.</param>
        /// <returns>If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.</returns>
        [PreserveSig]
        int CloseDW([In] UInt32 dwReserved);

        /// <summary>
        /// Notifies the docking window object that the frame's border space has changed.
        /// </summary>
        /// <param name="prcBorder">Pointer to a RECT structure that contains the frame's available border space.</param>
        /// <param name="punkToolbarSite">Pointer to the site's IUnknown interface. The docking window object should call the QueryInterface method for this interface, requesting IID_IDockingWindowSite.
        /// The docking window object then uses that interface to negotiate its border space. It is the docking window object's responsibility to release this interface when it is no longer needed.</param>
        /// <param name="fReserved">Reserved. This parameter should always be zero.</param>
        /// <returns>If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.</returns>
        [PreserveSig]
        int ResizeBorderDW(RECT prcBorder, [In, MarshalAs(UnmanagedType.IUnknown)] IntPtr punkToolbarSite, bool fReserved);
    }

    /// <summary>
    /// Gets information about a band object.
    /// </summary>
    [ComImport]
    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    [Guid("EB0FE172-1A3A-11D0-89B3-00A0C90A90AC")]
    public interface IDeskBand : IDockingWindow
    {
        #region IOleWindow

        [PreserveSig]
        new int GetWindow(out IntPtr phwnd);

        [PreserveSig]
        new int ContextSensitiveHelp(bool fEnterMode);

        #endregion

        #region IDockingWindow

        [PreserveSig]
        new int ShowDW([In] bool fShow);

        [PreserveSig]
        new int CloseDW([In] UInt32 dwReserved);

        [PreserveSig]
        new int ResizeBorderDW(RECT prcBorder, [In, MarshalAs(UnmanagedType.IUnknown)] IntPtr punkToolbarSite, bool fReserved);

        #endregion

        /// <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>If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.</returns>
        [PreserveSig]
        int GetBandInfo(UInt32 dwBandID, DESKBANDINFO.DBIF 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
    {
        #region IOleWindow

        [PreserveSig]
        new int GetWindow(out IntPtr phwnd);

        [PreserveSig]
        new int ContextSensitiveHelp(bool fEnterMode);

        #endregion

        #region IDockingWindow

        [PreserveSig]
        new int ShowDW([In] bool fShow);

        [PreserveSig]
        new int CloseDW([In] UInt32 dwReserved);

        [PreserveSig]
        new int ResizeBorderDW(RECT prcBorder, [In, MarshalAs(UnmanagedType.IUnknown)] IntPtr punkToolbarSite, bool fReserved);

        #endregion

        #region IDeskBand

        [PreserveSig]
        new int GetBandInfo(UInt32 dwBandID, DESKBANDINFO.DBIF dwViewMode, ref DESKBANDINFO pdbi);

        #endregion

        /// <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>
        /// 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);

        /// <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);
    }
}
View Code

DeskBand，這裡和GitHub上的程式不同的是，DeskBand直接繼承的ElementHost類，GitHub上的好像是多例的，我想要的是單例的，所以修改了一下。這裡粘的代碼是WPF的，如果你想實現Winform的，就讓DeskBand繼承UserControl，DeskBand代碼如下：

// Copyright(c) 2017 Patrick Becker
//
//
您的分享是我們最大的動力!

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