c#更新桌面使用接口

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更新桌面使用接口：IActiveDesktop
Com接口不能直接在.net中使用，所以需要在.net中重新定义，接口中使用的，结构也需要重新定义从网上找到这样一个类
引用地址：http://www.dotnet247.com/247reference/msgs/41/205722.aspx
using System;
using System.Runtime.InteropServices;

namespace WallPaper
{
enum WPSTYLE
{
    CENTER = 0,
    TILE = 1,
    STRETCH = 2,
    MAX = 3
}

struct WALLPAPEROPT
{
    public int dwSize;
    public WPSTYLE dwStyle;
}

struct COMPONENTSOPT
{
    public int dwSize;
    [MarshalAs(UnmanagedType.Bool)]
    public bool fEnableComponents;
    [MarshalAs(UnmanagedType.Bool)]
    public bool fActiveDesktop;
}

struct COMPPOS
{
    public const int COMPONENT_TOP = 0x3FFFFFFF;
    public const int COMPONENT_DEFAULT_LEFT = 0xFFFF;
    public const int COMPONENT_DEFAULT_TOP = 0xFFFF;

    public int dwSize;
    public int iLeft;
    public int iTop;
    public int dwWidth;
    public int dwHeight;
    public int izIndex;
    [MarshalAs(UnmanagedType.Bool)]
    public bool fCanResize;
    [MarshalAs(UnmanagedType.Bool)]
    public bool fCanResizeX;
    [MarshalAs(UnmanagedType.Bool)]
    public bool fCanResizeY;
    public int iPreferredLeftPercent;
    public int iPreferredTopPercent;
}

[Flags]
enum ITEMSTATE
{
    NORMAL = 0x00000001,
    FULLSCREEN = 00000002,
    SPLIT = 0x00000004,
    VALIDSIZESTATEBITS = NORMAL | SPLIT | FULLSCREEN,
    VALIDSTATEBITS = NORMAL | SPLIT | FULLSCREEN | unchecked((int)0x80000000) | 0x40000000
}

struct COMPSTATEINFO
{
    public int dwSize;
    public int iLeft;
    public int iTop;
    public int dwWidth;
    public int dwHeight;
    public int dwItemState;
}

enum COMP_TYPE
{
    HTMLDOC = 0,
    PICTURE = 1,
    WEBSITE = 2,
    CONTROL = 3,
    CFHTML = 4,
    MAX = 4
}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
struct COMPONENT
{
    private const int INTERNET_MAX_URL_LENGTH = 2084;   //   =
    // INTERNET_MAX_SCHEME_LENGTH   (32)   +   "://\0".Length   +
    // INTERNET_MAX_PATH_LENGTH   (2048)

    public int dwSize;
    public int dwID;
    public COMP_TYPE iComponentType;
    [MarshalAs(UnmanagedType.Bool)]
    public bool fChecked;
    [MarshalAs(UnmanagedType.Bool)]
    public bool fDirty;
    [MarshalAs(UnmanagedType.Bool)]
    public bool fNoScroll;
    public COMPPOS cpPos;
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]
    public string wszFriendlyName;
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = INTERNET_MAX_URL_LENGTH)]
    public string wszSource;
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = INTERNET_MAX_URL_LENGTH)]
    public string wszSubscribedURL;

    #if   AD_IE5
      public   int   dwCurItemState;
      public   COMPSTATEINFO   csiOriginal;
      public   COMPSTATEINFO   csiRestored;
    #endif
}

enum DTI_ADTIWUI
{
    DTI_ADDUI_DEFAULT = 0x00000000,
    DTI_ADDUI_DISPSUBWIZARD = 0x00000001,
    DTI_ADDUI_POSITIONITEM = 0x00000002,
}

[Flags]
enum AD_APPLY
{
    SAVE = 0x00000001,
    HTMLGEN = 0x00000002,
    REFRESH = 0x00000004,
    ALL = SAVE | HTMLGEN | REFRESH,
    FORCE = 0x00000008,
    BUFFERED_REFRESH = 0x00000010,
    DYNAMICREFRESH = 0x00000020
}

[Flags]
enum COMP_ELEM
{
    TYPE = 0x00000001,
    CHECKED = 0x00000002,
    DIRTY = 0x00000004,
    NOSCROLL = 0x00000008,
    POS_LEFT = 0x00000010,
    POS_TOP = 0x00000020,
    SIZE_WIDTH = 0x00000040,
    SIZE_HEIGHT = 0x00000080,
    POS_ZINDEX = 0x00000100,
    SOURCE = 0x00000200,
    FRIENDLYNAME = 0x00000400,
    SUBSCRIBEDURL = 0x00000800,
    ORIGINAL_CSI = 0x00001000,
    RESTORED_CSI = 0x00002000,
    CURITEMSTATE = 0x00004000,
    ALL = TYPE | CHECKED | DIRTY | NOSCROLL | POS_LEFT | SIZE_WIDTH |
        SIZE_HEIGHT | POS_ZINDEX | SOURCE |
        FRIENDLYNAME | POS_TOP | SUBSCRIBEDURL | ORIGINAL_CSI |
        RESTORED_CSI | CURITEMSTATE
}

[Flags]
enum ADDURL
{
    SILENT = 0x0001
}

[
    ComImport(),
    Guid("F490EB00-1240-11D1-9888-006097DEACF9"),
    InterfaceType(ComInterfaceType.InterfaceIsIUnknown)
]
interface IActiveDesktop
{
    void ApplyChanges(AD_APPLY dwFlags);
    void GetWallpaper([MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder pwszWallpaper, int cchWallpaper, int dwReserved);
    void SetWallpaper([MarshalAs(UnmanagedType.LPWStr)]   string pwszWallpaper, int dwReserved);
    void GetWallpaperOptions(ref   WALLPAPEROPT pwpo, int dwReserved);
    void SetWallpaperOptions([In]   ref   WALLPAPEROPT pwpo, int dwReserved);
    void GetPattern([MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder pwszPattern, int cchPattern, int dwReserved);
    void SetPattern([MarshalAs(UnmanagedType.LPWStr)]   string pwszPattern, int dwReserved);
    void GetDesktopItemOptions(ref   COMPONENTSOPT pco, int dwReserved);
    void SetDesktopItemOptions([In]   ref   COMPONENTSOPT pco, int dwReserved);
    void AddDesktopItem([In]   ref   COMPONENT pcomp, int dwReserved);
    void AddDesktopItemWithUI(IntPtr hwnd, [In]   ref   COMPONENT pcomp, DTI_ADTIWUI dwFlags);
    void ModifyDesktopItem([In]   ref   COMPONENT pcomp, COMP_ELEM dwFlags);
    void RemoveDesktopItem([In]   ref   COMPONENT pcomp, int dwReserved);
    void GetDesktopItemCount(out   int lpiCount, int dwReserved);
    void GetDesktopItem(int nComponent, ref   COMPONENT pcomp, int dwReserved);
    void GetDesktopItemByID(IntPtr dwID, ref   COMPONENT pcomp, int dwReserved);
    void GenerateDesktopItemHtml([MarshalAs(UnmanagedType.LPWStr)] string pwszFileName, [In]   ref   COMPONENT pcomp, int dwReserved);
    void AddUrl(IntPtr hwnd, [MarshalAs(UnmanagedType.LPWStr)]   string pszSource, [In]   ref   COMPONENT pcomp, ADDURL dwFlags);
    void GetDesktopItemBySource([MarshalAs(UnmanagedType.LPWStr)]  string pwszSource, ref   COMPONENT pcomp, int dwReserved);
}

[
    ComImport(),
    Guid("75048700-EF1F-11D0-9888-006097DEACF9")
]
class ActiveDesktop   /*   :   IActiveDesktop   */   { }
}

该类使用方法
ActiveDesktop ad = new ActiveDesktop();
IActiveDesktop iad = ad as IActiveDesktop;
if (iad != null)
{
    iad.SetWallpaper("d:\\WallPaper\\飞翔.jpg", 0);
    iad.ApplyChanges(AD_APPLY.ALL);
    System.Runtime.InteropServices.Marshal.ReleaseComObject(ad);
    ad = null;
}