C # Switch wallpaper using activedesktop, suitable for most image formats

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Operation Procedure: First add class: using system; using system. runtime. interopservices; namespace workhelper {Enum wpstyle {center = 0, tile = 1, stretch = 2, max = 3} struct wallpaperopt {public int dwsize; Public wpstyle dwstyle ;} struct componentsopt {public int dwsize; [financialas (unmanagedtype. bool)] public bool fenablecomponents; [financialas (unmanagedtype. bool)] public bool factivedesktop;} struct comppos {public Const int component_top = 0x3fffffff; Public const int component_default_left = 0 xFFFF; Public const int component_default_top = 0 xFFFF; Public int dwsize; Public int ileft; Public int iTOP; Public int dwwidth; public int dwheight; Public int izindex; [financialas (unmanagedtype. bool)] public bool fcanresize; [financialas (unmanagedtype. bool)] public bool fcanresizex; [financialas (unmanagedtype. bool)] pub LIC 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; Publ IC 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; [financialas (unmanagedtype. bool)] public bool fchecked; [financialas (unmanagedtype. bool)] public bool fdirty; [financialas (unmanagedtype. bool)] public bool fnoscroll; Public comppos cppos; [financialas (unmanagedtype. byvaltstr, sizeconst = 260)] Public String wszfriendlyname; [financialas (unmanagedtype. byvaltstr, sizeconst = internet_max_url_length)] public String wszsource; [financialas (unmanagedtype. byvaltstr, sizeconst = signature)] Public String comment; # If ad_ie5 public int dwcuritemstate; Public compstateinfo csioriginal; Public compstateinfo csirestored; # endif} Enum comment {Limit = 0x00000000, dti_addui_dispsubwizard = 0x00000001, dti_addui_positionitem = 0x00000002,} [flags] Enum ad_apply {save = 0x0 0000001, 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, sour Ce = 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 | contents | 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 ([financialas (unmanagedtype. lpwstr)] system. text. stringbuilder pwszwallpaper, int cchwallpaper, int dwreserved); void setwallpaper ([exploralas (unmanagedtype. lpwstr)] string pwszwallpaper, int dwreserved); void getwallpaperopti ONS (ref wallpaperopt pwpo, int dwreserved); void setwallpaperoptions ([in] ref wallpaperopt pwpo, int dwreserved); void getpattern ([financialas (unmanagedtype. lpwstr)] system. text. stringbuilder pwszpattern, int cchpattern, int dwreserved); void setpattern ([financialas (unmanagedtype. lpwstr)] string pwszpattern, int dwreserved); void getasktopitemoptions (ref componentsopt PCO, int dwreserved); void setde Sktopitemoptions ([in] ref componentsopt PCO, int dwreserved); void addmediatopitem ([in] ref component pcomp, int dwreserved); void aggregate (intptr hwnd, [in] ref component pcomp, revoke dwflags); void modify1_topitem ([in] ref component pcomp, comp_elem dwflags); void remove1_topitem ([in] ref component pcomp, int dwreserved); void get1_topitemcount (Out int lpicount, int dwrese Rved); void getasktopitem (INT ncomponent, ref component pcomp, int dwreserved); void getasktopitembyid (intptr dwid, ref component pcomp, int dwreserved. lpwstr)] string pwszfilename, [in] ref component pcomp, int dwreserved); void addurl (intptr hwnd, [financialas (unmanagedtype. lpwstr)] string pszsource, [in] ref component pcomp, addurl dwflags ); Void getasktopitembysource ([delealas (unmanagedtype. lpwstr)] string pwszsource, ref component pcomp, int dwreserved);} [comimport (), GUID ("750000000-ef1f-11d0-9888-006097deacf9")] class activedesktop /*: iactivedesktop */{} is called: (the background image style is finally completed) Public bool set0000bg (string filename) {try {activedesktop ad = new activedesktop (); iactivedesktop IAD = AD as iactivedesktop; if (IAD! = NULL) {// wpstyle_center center 0 // wpstyle_tile Tile 1 // wpstyle_stretch stretch 2 wpstyle dwstyle = wpstyle. stretch; // adjust the display background image style wallpaperopt Wp = new wallpaperopt (); WP. dwsize = system. runtime. interopservices. marshal. sizeof (WP); WP. dwstyle = dwstyle; IAD. setwallpaperoptions (ref WP, 0); IAD. setwallpaper (filename, 0); IAD. applychanges (ad_apply.all); system. runtime. interopservices. marshal. releasecomobject (AD); Ad = NULL;} return true;} catch {return false ;}}