c# - Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG)) -


i try flowing code create wmplib.iwmpfoldermonitorservices in c# manage folders contain music. 

public partial class mainwindow : window     {         private wmplib.iwmpplayer player;         private wmplib.iwmpfoldermonitorservices managefolder;           [dllimport("ole32.dll", exactspelling = true, preservesig = false)]         [return: marshalas(unmanagedtype.interface)]         static extern void cocreateinstance([in, marshalas(unmanagedtype.lpstruct)] guid rclsid,                                             [marshalas(unmanagedtype.iunknown)] object punkouter,                                              clsctx dwclscontext,                                             [in, marshalas(unmanagedtype.lpstruct)] guid riid,                                             [marshalas(unmanagedtype.iunknown)] out object rreturnedcomobject);          public mainwindow()         {             initializecomponent();              object instanceplayer = null;             guid guid_iwmpplayer = typeof(wmplib.iwmpplayer).guid;             guid guid_iunknown = new guid("00000000-0000-0000-c000-000000000046");              try             {                 cocreateinstance(guid_iwmpplayer, null, clsctx.clsctx_inproc_server, guid_iunknown, out instanceplayer);             }             catch (exception e)             {                 messagebox.show(e.message);             }                         type type = type.gettypefromclsid(guid_iwmpplayer);              player = instanceplayer wmplib.iwmpplayer;              object instancefolder = null;             guid guid_iwmfolder = typeof(wmplib.iwmpfoldermonitorservices).guid;             intptr ptr1, ptr2;              try             {                 ptr1 = marshal.getcominterfaceforobject(instanceplayer, type);                 marshal.queryinterface(ptr1, ref guid_iwmfolder, out ptr2);                 marshal.ptrtostructure(ptr2, instancefolder);             }             catch(exception e)             {                 messagebox.show(e.message);             }             managefolder = instancefolder wmplib.iwmpfoldermonitorservices;         }     } }

i exception :

class not registered (exception hresult: 0x80040154 (regdb_e_classnotreg))

at :

cocreateinstance(guid_iwmpplayer, null, clsctx.clsctx_inproc_server, guid_iunknown, out instanceplayer);

and exception:

value cannot null. parameter name: o

in second try block. search on google exception can't fix it.

if need create instance of media player, this:

windowsmediaplayerclass wmp = new windowsmediaplayerclass();

windowsmediaplayerclass has been created when imported wmplib.


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