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/fid3C15...sistStreamInit

But I cannot work out where IPersistStreamInit is defined.

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

On Aug 13, 8:12 pm, DouglasWoods
<DouglasWo... (AT) discussions (DOT) microsoft.com> wrote:

//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.InterfaceI sIUnknown)]
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();
}