用C# 更新桌面壁纸

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 ;
}   

转载于:https://www.cnblogs.com/XingfuStar/archive/2007/03/26/688001.html