C# Definition:

[ComImport,

Guid("b722bccb-4e68-101b-a2bc-00aa00404770"),

InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]

public interface IOleCommandTarget

{

    //IMPORTANT: The order of the methods is critical here. You
    //perform early binding in most cases, so the order of the methods
    //here MUST match the order of their vtable layout (which is determined
    //by their layout in IDL). The interop calls key off the vtable
    //ordering, not the symbolic names. Therefore, if you switched these
    //method declarations and tried to call the Exec method on an
    //IOleCommandTarget interface from your application, it would
    //translate into a call to the QueryStatus method instead.
    void QueryStatus(
        ref Guid pguidCmdGroup,
        UInt32 cCmds,
        [MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 1)] OLECMD[] prgCmds,
        ref OLECMDTEXT CmdText);
    void Exec(
        ref Guid pguidCmdGroup,
        uint nCmdId,
        uint nCmdExecOpt,
        ref object pvaIn,
        ref object pvaOut);

}

VB Definition:

<ComImport> _
<Guid("TODO")> _
'TODO: Insert <InterfaceType(ComInterfaceType.InterfaceIsIUnknown)> _ if this doesn't derive from IDispatch
Interface IOleCommandTarget
   TODO
End Interface

User-Defined Types:

None.

Notes:

None.

The above didn't work as is in C#. I looked on other sites and found this declaration which works for me (at least with Exec function) :

- Various sites declare OLECMD.cmdf as UInt64. For me this crashes IE7 just after my QueryStatus() method is called, but declaring it as uint works fine. This seems correct given the MSDN definition as a DWORD - http://msdn.microsoft.com/en-us/library/ms690534%28VS.85%29.aspx

C# Definition:

    [StructLayout(LayoutKind.Sequential)]
    public struct OLECMD
    {
        //public UInt32 cmdID;
        //public UInt64 cmdf;
        public uint cmdID;
        public uint cmdf;    // NB: See above note (*)    
    }

    [StructLayout(LayoutKind.Sequential)]
    public struct OLECMDTEXT
    {
        public UInt32 cmdtextf;
        public UInt32 cwActual;
        public UInt32 cwBuf;
        public char rgwz;
    }

    [ComImport, Guid("b722bccb-4e68-101b-a2bc-00aa00404770"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IOleCommandTarget
    {

        //IMPORTANT: The order of the methods is critical here. You
        //perform early binding in most cases, so the order of the methods
        //here MUST match the order of their vtable layout (which is determined
        //by their layout in IDL). The interop calls key off the vtable
        //ordering, not the symbolic names. Therefore, if you switched these
        //method declarations and tried to call the Exec method on an
        //IOleCommandTarget interface from your application, it would
        //translate into a call to the QueryStatus method instead.
        [PreserveSig()]
        int QueryStatus([In, MarshalAs(UnmanagedType.Struct)] ref Guid pguidCmdGroup, [MarshalAs(UnmanagedType.U4)] int cCmds, [In, Out]IntPtr prgCmds, [In, Out] IntPtr pCmdText);

        [PreserveSig()]
        int Exec(ref Guid pguidCmdGroup, uint nCmdID, uint nCmdExecOpt, object[] pvaIn, [In, Out, MarshalAs(UnmanagedType.LPArray)] object[] pvaOut);
    }

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