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POHow to cast a control to IOleObject
 

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    <p>I want to invoke <strong>GetClientSite</strong> on a .net control. For this purpose I am trying to cast a control (in example Windows.Forms.Form) to <strong>IOleObject</strong> which returns null.</p> <p>What should I do to get IOleObject?</p> <pre><code>using System; using System.Runtime.InteropServices; using System.Security; using System.Windows.Forms; namespace Test001 { public class Form001 : Form { public Form001() { InitializeComponent(); } private void InitializeComponent() { this.SuspendLayout(); this.Name = "Form001"; this.Text = "Form001"; this.Load += new System.EventHandler(this.Form001_Load); this.ResumeLayout(false); } private void Form001_Load(object sender, EventArgs e) { IOleObject obj = (IOleObject) this; //IOleClientSite site = obj.GetClientSite(); } } [ComImport, Guid("00000112-0000-0000-C000-000000000046"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown), SuppressUnmanagedCodeSecurity] public interface IOleObject { [PreserveSig] int SetClientSite([In, MarshalAs(UnmanagedType.Interface)] IOleClientSite pClientSite); IOleClientSite GetClientSite(); [PreserveSig] int SetHostNames([In, MarshalAs(UnmanagedType.LPWStr)] string szContainerApp, [In, MarshalAs(UnmanagedType.LPWStr)] string szContainerObj); [PreserveSig] int Close(int dwSaveOption); [PreserveSig] int SetMoniker([In, MarshalAs(UnmanagedType.U4)] int dwWhichMoniker, [In, MarshalAs(UnmanagedType.Interface)] object pmk); [PreserveSig] int GetMoniker([In, MarshalAs(UnmanagedType.U4)] int dwAssign, [In, MarshalAs(UnmanagedType.U4)] int dwWhichMoniker, [MarshalAs(UnmanagedType.Interface)] out object moniker); [PreserveSig] int InitFromData([In, MarshalAs(UnmanagedType.Interface)] IDataObject pDataObject, int fCreation, [In, MarshalAs(UnmanagedType.U4)] int dwReserved); [PreserveSig] int GetClipboardData([In, MarshalAs(UnmanagedType.U4)] int dwReserved, out IDataObject data); [PreserveSig] int DoVerb(int iVerb, [In] IntPtr lpmsg, [In, MarshalAs(UnmanagedType.Interface)] IOleClientSite pActiveSite, int lindex, IntPtr hwndParent, [In] object lprcPosRect); [PreserveSig] int EnumVerbs(out object e); [PreserveSig] int OleUpdate(); [PreserveSig] int IsUpToDate(); [PreserveSig] int GetUserClassID([In, Out] ref Guid pClsid); [PreserveSig] int GetUserType([In, MarshalAs(UnmanagedType.U4)] int dwFormOfType, [MarshalAs(UnmanagedType.LPWStr)] out string userType); [PreserveSig] int SetExtent([In, MarshalAs(UnmanagedType.U4)] int dwDrawAspect, [In] object pSizel); [PreserveSig] int GetExtent([In, MarshalAs(UnmanagedType.U4)] int dwDrawAspect, [Out] object pSizel); [PreserveSig] int Advise(object pAdvSink, out int cookie); [PreserveSig] int Unadvise([In, MarshalAs(UnmanagedType.U4)] int dwConnection); [PreserveSig] int EnumAdvise(out object e); [PreserveSig] int GetMiscStatus([In, MarshalAs(UnmanagedType.U4)] int dwAspect, out int misc); [PreserveSig] int SetColorScheme([In] object pLogpal); } [ComImport, InterfaceType(ComInterfaceType.InterfaceIsIUnknown), Guid("00000118-0000-0000-C000-000000000046")] public interface IOleClientSite { [PreserveSig] int SaveObject(); [PreserveSig] int GetMoniker([In, MarshalAs(UnmanagedType.U4)] int dwAssign, [In, MarshalAs(UnmanagedType.U4)] int dwWhichMoniker, [MarshalAs(UnmanagedType.Interface)] out object moniker); [PreserveSig] int GetContainer(out object container); [PreserveSig] int ShowObject(); [PreserveSig] int OnShowWindow(int fShow); [PreserveSig] int RequestNewObjectLayout(); } } </code></pre>
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