Getting the COM IDataObject interface from the DataObject class

[Bob Staheli]

The .Net DataObject class implements the COM/OLE IDataObject interface , so
how do I get it.

I have tried this, but it does not work :

// Declare the COM/OLE IDataObject interface

[ComImport, Guid("0000010E-0000-0000-C000-000000000046"),
InterfaceType(C omInterfaceType .InterfaceIsIUn known)]
public interface IOleDataObject
{
[PreserveSig]
int OleGetData(FORM ATETC pFormatetc, [Out] STGMEDIUM pMedium);
[PreserveSig]
int OleGetDataHere( FORMATETC pFormatetc, [In, Out] STGMEDIUM pMedium);
[PreserveSig]
int OleQueryGetData (FORMATETC pFormatetc);
[PreserveSig]
int OleGetCanonical FormatEtc(FORMA TETC pformatectIn, [Out] FORMATETC
pformatetcOut);
[PreserveSig]
int OleSetData(FORM ATETC pFormatectIn, STGMEDIUM pmedium, int fRelease);
[return: MarshalAs(Unman agedType.Interf ace)]
IEnumFORMATETC OleEnumFormatEt c([In, MarshalAs(Unman agedType.U4)] int
dwDirection);
[PreserveSig]
int OleDAdvise(FORM ATETC pFormatetc, [In, MarshalAs(Unman agedType.U4)] int
advf, [In, MarshalAs(Unman agedType.Interf ace)] object pAdvSink, [Out,
MarshalAs(Unman agedType.LPArra y)] int[] pdwConnection);
[PreserveSig]
int OleDUnadvise([In, MarshalAs(Unman agedType.U4)] int dwConnection);
[PreserveSig]
int OleEnumDAdvise([Out, MarshalAs(Unman agedType.LPArra y)] object[]
ppenumAdvise);
}

-------------------

DataObject data = new DataObject();
IOleDataObject ido = data as IOleDataObject
--------------

When this is run, ido is null. I have also tried varrious other methods like
using Marshal.GetIUnk nownForObject, Marshal.QueryIn terface,
Marshal.GetType dObjectForIUnkn own, but none of the approaches work.

What am I doing wrong?

Thanks
Bob

[Nicholas Paldino [.NET/C# MVP]]

Bob,

You can use the IDataObject in the
System.Runtime. InteropServices .ComTypes namespace. It is the one you are
looking for.

The DataObject class in the System.Windows. Forms namespace implements
this as well.

Hope this helps.

--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m

"Bob Staheli" <st*********@gm ail.com> wrote in message
news:%2******** *******@tk2msft ngp13.phx.gbl.. .

The .Net DataObject class implements the COM/OLE IDataObject interface ,
so how do I get it.

I have tried this, but it does not work :

// Declare the COM/OLE IDataObject interface

[ComImport, Guid("0000010E-0000-0000-C000-000000000046"),
InterfaceType(C omInterfaceType .InterfaceIsIUn known)]
public interface IOleDataObject
{
[PreserveSig]
int OleGetData(FORM ATETC pFormatetc, [Out] STGMEDIUM pMedium);
[PreserveSig]
int OleGetDataHere( FORMATETC pFormatetc, [In, Out] STGMEDIUM pMedium);
[PreserveSig]
int OleQueryGetData (FORMATETC pFormatetc);
[PreserveSig]
int OleGetCanonical FormatEtc(FORMA TETC pformatectIn, [Out] FORMATETC
pformatetcOut);
[PreserveSig]
int OleSetData(FORM ATETC pFormatectIn, STGMEDIUM pmedium, int fRelease);
[return: MarshalAs(Unman agedType.Interf ace)]
IEnumFORMATETC OleEnumFormatEt c([In, MarshalAs(Unman agedType.U4)] int
dwDirection);
[PreserveSig]
int OleDAdvise(FORM ATETC pFormatetc, [In, MarshalAs(Unman agedType.U4)] int
advf, [In, MarshalAs(Unman agedType.Interf ace)] object pAdvSink, [Out,
MarshalAs(Unman agedType.LPArra y)] int[] pdwConnection);
[PreserveSig]
int OleDUnadvise([In, MarshalAs(Unman agedType.U4)] int dwConnection);
[PreserveSig]
int OleEnumDAdvise([Out, MarshalAs(Unman agedType.LPArra y)] object[]
ppenumAdvise);
}

-------------------

DataObject data = new DataObject();
IOleDataObject ido = data as IOleDataObject
--------------

When this is run, ido is null. I have also tried varrious other methods
like using Marshal.GetIUnk nownForObject, Marshal.QueryIn terface,
Marshal.GetType dObjectForIUnkn own, but none of the approaches work.

What am I doing wrong?

Thanks
Bob

[Bob Staheli]

Hi Nicholas,

Thanks for your reply.

However, System.Runtime. InteropServices .ComTypes.IData Object is only
present in .Net 2.0. I am using .Net 1.1.

How can I do that in this case?

Bob
"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard .caspershouse.c om> wrote in
message news:Ot******** ******@TK2MSFTN GP12.phx.gbl...

Bob,

You can use the IDataObject in the
System.Runtime. InteropServices .ComTypes namespace. It is the one you are
looking for.

The DataObject class in the System.Windows. Forms namespace implements
this as well.

Hope this helps.

--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m

"Bob Staheli" <st*********@gm ail.com> wrote in message
news:%2******** *******@tk2msft ngp13.phx.gbl.. .

The .Net DataObject class implements the COM/OLE IDataObject interface ,
so how do I get it.

I have tried this, but it does not work :

// Declare the COM/OLE IDataObject interface

[ComImport, Guid("0000010E-0000-0000-C000-000000000046"),
InterfaceType(C omInterfaceType .InterfaceIsIUn known)]
public interface IOleDataObject
{
[PreserveSig]
int OleGetData(FORM ATETC pFormatetc, [Out] STGMEDIUM pMedium);
[PreserveSig]
int OleGetDataHere( FORMATETC pFormatetc, [In, Out] STGMEDIUM pMedium);
[PreserveSig]
int OleQueryGetData (FORMATETC pFormatetc);
[PreserveSig]
int OleGetCanonical FormatEtc(FORMA TETC pformatectIn, [Out] FORMATETC
pformatetcOut);
[PreserveSig]
int OleSetData(FORM ATETC pFormatectIn, STGMEDIUM pmedium, int fRelease);
[return: MarshalAs(Unman agedType.Interf ace)]
IEnumFORMATETC OleEnumFormatEt c([In, MarshalAs(Unman agedType.U4)] int
dwDirection);
[PreserveSig]
int OleDAdvise(FORM ATETC pFormatetc, [In, MarshalAs(Unman agedType.U4)]
int advf, [In, MarshalAs(Unman agedType.Interf ace)] object pAdvSink, [Out,
MarshalAs(Unman agedType.LPArra y)] int[] pdwConnection);
[PreserveSig]
int OleDUnadvise([In, MarshalAs(Unman agedType.U4)] int dwConnection);
[PreserveSig]
int OleEnumDAdvise([Out, MarshalAs(Unman agedType.LPArra y)] object[]
ppenumAdvise);
}

-------------------

DataObject data = new DataObject();
IOleDataObject ido = data as IOleDataObject
--------------

When this is run, ido is null. I have also tried varrious other methods
like using Marshal.GetIUnk nownForObject, Marshal.QueryIn terface,
Marshal.GetType dObjectForIUnkn own, but none of the approaches work.

What am I doing wrong?

Thanks
Bob

[Nicholas Paldino [.NET/C# MVP]]

Bob,

You should be able to declare this in your code, and it should work:

[ComImport, InterfaceType(C omInterfaceType .InterfaceIsIUn known),
Guid("0000010E-0000-0000-C000-000000000046")]
public interface IDataObject
{
void GetData([In] ref FORMATETC format, out STGMEDIUM medium);
void GetDataHere([In] ref FORMATETC format, ref STGMEDIUM medium);
[PreserveSig]
int QueryGetData([In] ref FORMATETC format);
[PreserveSig]
int GetCanonicalFor matEtc([In] ref FORMATETC formatIn, out FORMATETC
formatOut);
void SetData([In] ref FORMATETC formatIn, [In] ref STGMEDIUM medium,
[MarshalAs(Unman agedType.Bool)] bool release);
IEnumFORMATETC EnumFormatEtc(D ATADIR direction);
[PreserveSig]
int DAdvise([In] ref FORMATETC pFormatetc, ADVF advf, IAdviseSink
adviseSink, out int connection);
void DUnadvise(int connection);
[PreserveSig]
int EnumDAdvise(out IEnumSTATDATA enumAdvise);
}-- - Nicholas Paldino [.NET/C# MVP] -
mv*@spam.guard. caspershouse.co m

"Bob Staheli" <st*********@gm ail.com> wrote in message
news:%2******** ********@tk2msf tngp13.phx.gbl. ..

Hi Nicholas,

Thanks for your reply.

However, System.Runtime. InteropServices .ComTypes.IData Object is only
present in .Net 2.0. I am using .Net 1.1.

How can I do that in this case?

Bob
"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard .caspershouse.c om> wrote
in message news:Ot******** ******@TK2MSFTN GP12.phx.gbl...

Bob,

You can use the IDataObject in the
System.Runtime. InteropServices .ComTypes namespace. It is the one you are
looking for.

The DataObject class in the System.Windows. Forms namespace implements
this as well.

Hope this helps.

--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m

"Bob Staheli" <st*********@gm ail.com> wrote in message
news:%2******** *******@tk2msft ngp13.phx.gbl.. .

The .Net DataObject class implements the COM/OLE IDataObject interface ,
so how do I get it.

I have tried this, but it does not work :

// Declare the COM/OLE IDataObject interface

[ComImport, Guid("0000010E-0000-0000-C000-000000000046"),
InterfaceType(C omInterfaceType .InterfaceIsIUn known)]
public interface IOleDataObject
{
[PreserveSig]
int OleGetData(FORM ATETC pFormatetc, [Out] STGMEDIUM pMedium);
[PreserveSig]
int OleGetDataHere( FORMATETC pFormatetc, [In, Out] STGMEDIUM pMedium);
[PreserveSig]
int OleQueryGetData (FORMATETC pFormatetc);
[PreserveSig]
int OleGetCanonical FormatEtc(FORMA TETC pformatectIn, [Out] FORMATETC
pformatetcOut);
[PreserveSig]
int OleSetData(FORM ATETC pFormatectIn, STGMEDIUM pmedium, int fRelease);
[return: MarshalAs(Unman agedType.Interf ace)]
IEnumFORMATETC OleEnumFormatEt c([In, MarshalAs(Unman agedType.U4)] int
dwDirection);
[PreserveSig]
int OleDAdvise(FORM ATETC pFormatetc, [In, MarshalAs(Unman agedType.U4)]
int advf, [In, MarshalAs(Unman agedType.Interf ace)] object pAdvSink,
[Out, MarshalAs(Unman agedType.LPArra y)] int[] pdwConnection);
[PreserveSig]
int OleDUnadvise([In, MarshalAs(Unman agedType.U4)] int dwConnection);
[PreserveSig]
int OleEnumDAdvise([Out, MarshalAs(Unman agedType.LPArra y)] object[]
ppenumAdvise);
}

-------------------

DataObject data = new DataObject();
IOleDataObject ido = data as IOleDataObject
--------------

When this is run, ido is null. I have also tried varrious other methods
like using Marshal.GetIUnk nownForObject, Marshal.QueryIn terface,
Marshal.GetType dObjectForIUnkn own, but none of the approaches work.

What am I doing wrong?

Thanks
Bob

[Bob Staheli]

I tried your declaration but it didnt work..most wierd.

I should note that I changed IAdviseSink from the DAdvice method to an
[In, MarshalAs(Unman agedType.Interf ace)] object - does that make a
difference - i would think it is only the GUID applied to the interface that
matters...

Once again..i am using this code :
DataObject d = new DataObject();
IDataObject id = d as IDataObject;

id is still null.

I am out of ideas now.

Bob

"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard .caspershouse.c om> wrote in
message news:%2******** *******@tk2msft ngp13.phx.gbl.. .

Bob,

You should be able to declare this in your code, and it should work:

[ComImport, InterfaceType(C omInterfaceType .InterfaceIsIUn known),
Guid("0000010E-0000-0000-C000-000000000046")]
public interface IDataObject
{
void GetData([In] ref FORMATETC format, out STGMEDIUM medium);
void GetDataHere([In] ref FORMATETC format, ref STGMEDIUM medium);
[PreserveSig]
int QueryGetData([In] ref FORMATETC format);
[PreserveSig]
int GetCanonicalFor matEtc([In] ref FORMATETC formatIn, out FORMATETC
formatOut);
void SetData([In] ref FORMATETC formatIn, [In] ref STGMEDIUM medium,
[MarshalAs(Unman agedType.Bool)] bool release);
IEnumFORMATETC EnumFormatEtc(D ATADIR direction);
[PreserveSig]
int DAdvise([In] ref FORMATETC pFormatetc, ADVF advf, IAdviseSink
adviseSink, out int connection);
void DUnadvise(int connection);
[PreserveSig]
int EnumDAdvise(out IEnumSTATDATA enumAdvise);
}-- - Nicholas Paldino [.NET/C# MVP] -
mv*@spam.guard. caspershouse.co m

"Bob Staheli" <st*********@gm ail.com> wrote in message
news:%2******** ********@tk2msf tngp13.phx.gbl. ..

Hi Nicholas,

Thanks for your reply.

However, System.Runtime. InteropServices .ComTypes.IData Object is only
present in .Net 2.0. I am using .Net 1.1.

How can I do that in this case?

Bob
"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard .caspershouse.c om> wrote
in message news:Ot******** ******@TK2MSFTN GP12.phx.gbl...

Bob,

You can use the IDataObject in the
System.Runtime. InteropServices .ComTypes namespace. It is the one you
are looking for.

The DataObject class in the System.Windows. Forms namespace implements
this as well.

Hope this helps.

--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m

"Bob Staheli" <st*********@gm ail.com> wrote in message
news:%2******** *******@tk2msft ngp13.phx.gbl.. .
The .Net DataObject class implements the COM/OLE IDataObject interface
, so how do I get it.

I have tried this, but it does not work :

// Declare the COM/OLE IDataObject interface

[ComImport, Guid("0000010E-0000-0000-C000-000000000046"),
InterfaceType(C omInterfaceType .InterfaceIsIUn known)]
public interface IOleDataObject
{
[PreserveSig]
int OleGetData(FORM ATETC pFormatetc, [Out] STGMEDIUM pMedium);
[PreserveSig]
int OleGetDataHere( FORMATETC pFormatetc, [In, Out] STGMEDIUM pMedium);
[PreserveSig]
int OleQueryGetData (FORMATETC pFormatetc);
[PreserveSig]
int OleGetCanonical FormatEtc(FORMA TETC pformatectIn, [Out] FORMATETC
pformatetcOut);
[PreserveSig]
int OleSetData(FORM ATETC pFormatectIn, STGMEDIUM pmedium, int
fRelease);
[return: MarshalAs(Unman agedType.Interf ace)]
IEnumFORMATETC OleEnumFormatEt c([In, MarshalAs(Unman agedType.U4)] int
dwDirection);
[PreserveSig]
int OleDAdvise(FORM ATETC pFormatetc, [In, MarshalAs(Unman agedType.U4)]
int advf, [In, MarshalAs(Unman agedType.Interf ace)] object pAdvSink,
[Out, MarshalAs(Unman agedType.LPArra y)] int[] pdwConnection);
[PreserveSig]
int OleDUnadvise([In, MarshalAs(Unman agedType.U4)] int dwConnection);
[PreserveSig]
int OleEnumDAdvise([Out, MarshalAs(Unman agedType.LPArra y)] object[]
ppenumAdvise);
}

-------------------

DataObject data = new DataObject();
IOleDataObject ido = data as IOleDataObject
--------------

When this is run, ido is null. I have also tried varrious other methods
like using Marshal.GetIUnk nownForObject, Marshal.QueryIn terface,
Marshal.GetType dObjectForIUnkn own, but none of the approaches work.

What am I doing wrong?

Thanks
Bob