I am accessing a COM object from C#. The COM object has a IPersistStreamInit 
interface which I want to use. 

Is the IPersistStreamInit defined in the .NET Framework? I couldn't find it 
in system.runtime.interopservices.  I have searched and found C# code that 
has code like

Interop.IPersistStreamInit psi = 
(Interop.IPersistStreamInit)_site.MSHTMLDocument;

http://www.koders.com/csharp/fid3C1586372712141DB6359918187BCEFCEF0F3F97.aspx?s=IPersistStreamInit

But I cannot work out where IPersistStreamInit is defined.

Can anyone point direct me out of this maze?
-- 
Douglas  Woods

>Is the IPersistStreamInit defined in the .NET Framework? I couldn't find it 
>in system.runtime.interopservices.  I have searched and found C# code that 
>has code like


No it isn't. You have to define it yourself. You can start with
IPersistStream from here

http://www.pinvoke.net/default.aspx/Interfaces/IPersistStream.html

and then add the IPersistStreamInit methods.


Mattias

-- 
Mattias Sjgren [C# MVP]  mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.

On Aug 13, 8:12 pm, DouglasWoods
 wrote:

> I am accessing a COM object from C#. The COM object has a IPersistStreamInit
> interface which I want to use.
>
> Is the IPersistStreamInit defined in the .NET Framework? I couldn't find it
> in system.runtime.interopservices.  I have searched and found C# code that
> has code like
>
> Interop.IPersistStreamInit psi =
> (Interop.IPersistStreamInit)_site.MSHTMLDocument;
>
> http://www.koders.com/csharp/fid3C1586372712141DB6359918187BCEFCEF0F3...
>
> But I cannot work out where IPersistStreamInit is defined.
>
> Can anyone point direct me out of this maze?
> --
> Douglas  Woods



    //MIDL_INTERFACE("7FD52380-4E07-101B-AE2D-08002B2EC713")
    //IPersistStreamInit : public IPersist
    //{
    //public:
    //    virtual HRESULT STDMETHODCALLTYPE IsDirty( void) = 0;

    //    virtual HRESULT STDMETHODCALLTYPE Load(
    //        /* [in] */ LPSTREAM pStm) = 0;

    //    virtual HRESULT STDMETHODCALLTYPE Save(
    //        /* [in] */ LPSTREAM pStm,
    //        /* [in] */ BOOL fClearDirty) = 0;

    //    virtual HRESULT STDMETHODCALLTYPE GetSizeMax(
    //        /* [out] */ ULARGE_INTEGER *pCbSize) = 0;

    //    virtual HRESULT STDMETHODCALLTYPE InitNew( void) = 0;

    //};

    [ComVisible(true), ComImport(),
    Guid("7FD52380-4E07-101B-AE2D-08002B2EC713"),
    InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IPersistStreamInit
    {
        void GetClassID(
            [In, Out] ref Guid pClassID);

        [return: MarshalAs(UnmanagedType.I4)]
        [PreserveSig]
        int IsDirty();

        [return: MarshalAs(UnmanagedType.I4)]
        [PreserveSig]
        int Load(
            [In, MarshalAs(UnmanagedType.Interface)]
            System.Runtime.InteropServices.ComTypes.IStream pstm);

        [return: MarshalAs(UnmanagedType.I4)]
        [PreserveSig]
        int Save(
            [In, MarshalAs(UnmanagedType.Interface)]
            System.Runtime.InteropServices.ComTypes.IStream pstm,
            [In, MarshalAs(UnmanagedType.Bool)] bool fClearDirty);

        void GetSizeMax(
            [Out, MarshalAs(UnmanagedType.LPArray)] long pcbSize);

        [return: MarshalAs(UnmanagedType.I4)]
        [PreserveSig]
        int InitNew();
    }