private static int Next(IntPtr thisPtr, int celt, FORMATETC *rgelt, int *pceltFetched)
{
try
{
IEnumFORMATETC instance = ComInterfaceDispatch.GetInstance <IEnumFORMATETC>((ComInterfaceDispatch *)thisPtr);
FORMATETC[] elt = new FORMATETC[celt];
int[] celtFetched = new int[1];
// Eliminate null bang after https://github.com/dotnet/runtime/pull/68537 lands, or
// IEnumFORMATETC annotations would be corrected.
var result = instance.Next(celt, elt, pceltFetched is null ? null ! : celtFetched);
for (var i = 0; i < celt; i++)
{
rgelt[i] = elt[i];
}
if (pceltFetched is not null)
{
*pceltFetched = celtFetched[0];
}
return(result);
}
catch (Exception ex)
{
Debug.WriteLine(ex);
return(ex.HResult);
}
}
public IEnumerable <DataObjectFormat> GetFormats()
{
IEnumFORMATETC enumFormatEtc = null !;
try
{
enumFormatEtc = DataObject.EnumFormatEtc(DATADIR.DATADIR_GET);
if (enumFormatEtc == null)
{
return(Array.Empty <DataObjectFormat>());
}
enumFormatEtc.Reset();
var fe = new FORMATETC[1];
var fs = new List <DataObjectFormat>();
while (enumFormatEtc.Next(1, fe, null) == 0)
{
fs.Add(new DataObjectFormat(fe[0]));
}
return(fs);
}
finally
{
if (enumFormatEtc != null)
{
Marshal.ReleaseComObject(enumFormatEtc);
}
}
}
public virtual string[] GetFormats(bool autoConvert)
{
Debug.Assert(innerData != null, "You must have an innerData on all DataObjects");
IEnumFORMATETC enumFORMATETC = null;
ArrayList formats = new ArrayList();
try
{
enumFORMATETC = innerData.EnumFormatEtc(DATADIR.DATADIR_GET);
}
catch
{
}
if (enumFORMATETC != null)
{
enumFORMATETC.Reset();
FORMATETC[] formatetc = new FORMATETC[] { new FORMATETC() };
int[] retrieved = new int[] { 1 };
while (retrieved[0] > 0)
{
retrieved[0] = 0;
try
{
enumFORMATETC.Next(1, formatetc, retrieved);
}
catch
{
}
if (retrieved[0] > 0)
{
string name = DataFormats.GetFormat(formatetc[0].cfFormat).Name;
if (autoConvert)
{
string[] mappedFormats = GetMappedFormats(name);
for (int i = 0; i < mappedFormats.Length; i++)
{
formats.Add(mappedFormats[i]);
}
}
else
{
formats.Add(name);
}
}
}
}
string[] temp = new string[formats.Count];
formats.CopyTo(temp, 0);
return(GetDistinctStrings(temp));
}
public virtual string[] GetFormats(bool autoConvert)
{
Debug.Assert(innerData != null, "You must have an innerData on all DataObjects");
IEnumFORMATETC enumFORMATETC = null;
// Since we are only adding elements to the HashSet, the order will be preserved.
HashSet <string> distinctFormats = new HashSet <string>();
try
{
enumFORMATETC = innerData.EnumFormatEtc(DATADIR.DATADIR_GET);
}
catch
{
}
if (enumFORMATETC != null)
{
enumFORMATETC.Reset();
FORMATETC[] formatetc = new FORMATETC[] { new FORMATETC() };
int[] retrieved = new int[] { 1 };
while (retrieved[0] > 0)
{
retrieved[0] = 0;
try
{
enumFORMATETC.Next(1, formatetc, retrieved);
}
catch
{
}
if (retrieved[0] > 0)
{
string name = DataFormats.GetFormat(formatetc[0].cfFormat).Name;
if (autoConvert)
{
string[] mappedFormats = GetMappedFormats(name);
for (int i = 0; i < mappedFormats.Length; i++)
{
distinctFormats.Add(mappedFormats[i]);
}
}
else
{
distinctFormats.Add(name);
}
}
}
}
return(distinctFormats.ToArray());
}
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);
}
}
}