Question

我想在.net控件上调用 GetClientSite 。为此，我试图将控件（例如Windows.Forms.Form）转换为 IOleObject ，返回null。

我该怎么做才能获得IOleObject？

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();
    }
}

Answer 1

IOleObject接口是UnsafeNativeMethods程序集中内部System.Windows.Forms类内的嵌套接口。 System.Windows.Forms.Control在内部实现，显式。

创建另一个具有相同名称和guid的接口不会使它在托管级别上成为“相同的接口”。

这一行

IOleObject obj = (IOleObject) this;

表示托管的.net转换，与COM无关。此演员表仅适用于winforms程序集中的完全相同的界面，该界面不公开。

您可以尝试通过InterfaceMapping结构使用反射来获取方法（但请注意，这是不可取的）：

Type thisType = this.GetType();

Type oleInterface = thisType.GetInterface("IOleObject");

MethodInfo getSiteMethod = oleInterface.GetMethod("GetClientSite");

//InterfaceMapping is used to get more complex interface scenarios
InterfaceMapping map = thisType.GetInterfaceMap(oleInterface);

//at which index is the explicit implementation
int index = Array.IndexOf(map.InterfaceMethods, getSiteMethod);
MethodInfo actualExplicitMethod = map.TargetMethods[index];

//late-bound call (slow)
object o = actualExplicitMethod.Invoke(this, new object[] { });

现在，首先，你得到一个包含在System.Object中的内部类型，由于原始界面是内部的，因此无法强制转换到你的界面，所以只要打算使用它就可以获得更多的反射乐趣对象

其次，我已经尝试过，该技术可行，但在您的特定情况下，调用Windows窗体的方法会引发异常 - "Top-level Windows Forms control cannot be exposed as an ActiveX control."。

Answer 2

我正在使用这种方法：

IOleClientSite pClientSite = (IOleClientSite)Site.GetService(new AntiMoniker().GetType());

例如，定义AntiMoniker。目前，不需要详细信息。只需获取System .__ ComObject的实例。

[ComImport(), Guid("00000305-0000-0000-C000-000000000046")]
class AntiMoniker {
}

它适用于.NET Framework 2.0 / IE8 / WinXP SP3

由于

Answer 3

Here is another method，使用Marshal.CreateAggregatedObject访问私有COM接口。

如何将控件转换为IOleObject

3 个答案: