public void Clone(out IEnumFORMATETC newEnum)
{
//Create new enumerators
newEnum = new FormatEtcEnumerator(formats);
}
public int EnumFormatEtc(DATADIR direction, out IEnumFORMATETC ppenumFormatEtc)
{
IEnumFORMATETC origEnum = null;
try
{
log.DebugFormat("IDataObject.EnumFormatEtc called -- direction {0}", direction);
switch (direction)
{
case DATADIR.DATADIR_GET:
//Get original enumerator
int result = innerData.EnumFormatEtc(direction, out origEnum);
if (result != NativeMethods.S_OK)
{
ppenumFormatEtc = null;
return(result);
}
//Enumerate original formats
List <FORMATETC> formats = new List <FORMATETC>();
FORMATETC[] buffer = new FORMATETC[] { new FORMATETC() };
while (origEnum.Next(1, buffer, null) == NativeMethods.S_OK)
{
//Convert format from short to unsigned short
ushort cfFormat = (ushort)buffer[0].cfFormat;
//Do not return text formats -- some applications try to get text before files
if (cfFormat != NativeMethods.CF_TEXT && cfFormat != NativeMethods.CF_UNICODETEXT && cfFormat != (ushort)DataObjectHelper.GetClipboardFormat("Csv"))
{
formats.Add(buffer[0]);
}
}
//Add CF_HDROP format
FORMATETC format = new FORMATETC();
format.cfFormat = NativeMethods.CF_HDROP;
format.dwAspect = DVASPECT.DVASPECT_CONTENT;
format.lindex = -1;
format.ptd = IntPtr.Zero;
format.tymed = TYMED.TYMED_HGLOBAL;
formats.Add(format);
//Return new enumerator for available formats
ppenumFormatEtc = new FormatEtcEnumerator(formats.ToArray());
return(NativeMethods.S_OK);
case DATADIR.DATADIR_SET:
//Return original enumerator
return(innerData.EnumFormatEtc(direction, out ppenumFormatEtc));
default:
//Invalid direction
ppenumFormatEtc = null;
return(NativeMethods.E_INVALIDARG);
}
}
catch (Exception ex)
{
log.Error("Exception in IDataObject.EnumFormatEtc", ex);
ppenumFormatEtc = null;
return(NativeMethods.E_UNEXPECTED);
}
finally
{
//Release all unmanaged objects
if (origEnum != null)
{
Marshal.ReleaseComObject(origEnum);
}
}
}