从C#调用IDispatch COM接口的成员

Question

我想从COM对象调用GetIdsOfNames函数,该对象在c#中实现IDispatch接口.我编写了以下代码,但它失败了DISP_E_UNKNOWNNAME.这是正确的做法吗？

 Object so = Activator.CreateInstance(Type.GetTypeFromProgID("ProgID"));            
 Object[] args = new Object[5];
 string[] rgsNames = new string[1];
 rgsNames[0] = "PrintNormal";
 uint LOCALE_SYSTEM_DEFAULT = 0x0800;
 uint lcid = LOCALE_SYSTEM_DEFAULT;
 int cNames = 1;
 int[] rgDispId = new int[1];
 args[0] = IntPtr.Zero;
 args[1] = rgsNames;
 args[2] = cNames;
 args[3] = lcid;
 args[4] = rgDispId;             
 Object result = so.GetType().InvokeMember("GetIDsOfNames", BindingFlags.InvokeMethod, null, so, args);

谢谢,

理查德

Answer 1

是的,不起作用,RCW不公开IDispatch方法.您必须显式获取IDispatch接口引用.这很好用:

using System;
using System.Runtime.InteropServices;
using System.Runtime.InteropServices.ComTypes;

class Program {
    static void Main() {
        Object so = Activator.CreateInstance(Type.GetTypeFromProgID("SAPI.SpVoice"));
        string[] rgsNames = new string[1];
        int[] rgDispId = new int[1];
        rgsNames[0] = "Speak";
        IDispatch disp = (IDispatch)so;
        Guid dummy = Guid.Empty;
        disp.GetIDsOfNames(ref dummy, rgsNames, 1, 0x800, rgDispId);
        Console.WriteLine(rgDispId[0]);
    }

    [ComImport, InterfaceType(ComInterfaceType.InterfaceIsIUnknown), Guid("00020400-0000-0000-C000-000000000046")]
    private interface IDispatch {
        int GetTypeInfoCount();
        [return: MarshalAs(UnmanagedType.Interface)]
        ITypeInfo GetTypeInfo([In, MarshalAs(UnmanagedType.U4)] int iTInfo, [In, MarshalAs(UnmanagedType.U4)] int lcid);
        void GetIDsOfNames([In] ref Guid riid, [In, MarshalAs(UnmanagedType.LPArray)] string[] rgszNames, [In, MarshalAs(UnmanagedType.U4)] int cNames, [In, MarshalAs(UnmanagedType.U4)] int lcid, [Out, MarshalAs(UnmanagedType.LPArray)] int[] rgDispId);
    }
}

Answer 2

不能，您不能，因为InvokeMember内部使用GetIDsOfNames，并且该方法仅检查实际方法，而不检查IDispatch中的前6个方法。换句话说，不能使用IDispatch的方法Invoke调用GetIDsOfNames。这就是COM的工作方式。