public int QueryGetData(ref FORMATETC format)
{
try
{
log.DebugFormat("IDataObject.QueryGetData called -- cfFormat {0} dwAspect {1} lindex {2} ptd {3} tymed {4}", format.cfFormat, format.dwAspect, format.lindex, format.ptd, format.tymed);
log.DebugFormat("Format name: {0}", System.Windows.Forms.DataFormats.GetFormat((ushort)format.cfFormat).Name);
if (format.cfFormat == NativeMethods.CF_HDROP)
{
//Validate index
if (format.lindex != -1)
{
return(NativeMethods.DV_E_LINDEX);
}
//Validate medium type
if (!format.tymed.HasFlag(TYMED.TYMED_HGLOBAL))
{
return(NativeMethods.DV_E_TYMED);
}
//Validate DV aspect
if (format.dwAspect != DVASPECT.DVASPECT_CONTENT)
{
return(NativeMethods.DV_E_DVASPECT);
}
log.DebugFormat("IDataObject.QueryGetData result: {0}", NativeMethods.S_OK);
return(NativeMethods.S_OK);
}
else if (format.cfFormat == NativeMethods.CF_TEXT || format.cfFormat == NativeMethods.CF_UNICODETEXT || format.cfFormat == (ushort)DataObjectHelper.GetClipboardFormat("Csv"))
{
//Do not return text formats -- some applications try to get text before files
return(NativeMethods.DV_E_FORMATETC);
}
else
{
int result = innerData.QueryGetData(format);
log.DebugFormat("Result: {0}", result);
return(result);
}
}
catch (Exception ex)
{
log.Error("Exception in IDataObject.QueryGetData", ex);
return(NativeMethods.E_UNEXPECTED);
}
}
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);
}
}
}
public int GetData(ref FORMATETC format, out STGMEDIUM medium)
{
try
{
//Get data into passed medium
log.DebugFormat("IDataObject.GetData called -- cfFormat {0} dwAspect {1} lindex {2} ptd {3} tymed {4}", format.cfFormat, format.dwAspect, format.lindex, format.ptd, format.tymed);
log.DebugFormat("Format name: {0}", System.Windows.Forms.DataFormats.GetFormat((ushort)format.cfFormat).Name);
if (format.cfFormat == NativeMethods.CF_HDROP)
{
medium = new STGMEDIUM();
//Validate index
if (format.lindex != -1)
{
return(NativeMethods.DV_E_LINDEX);
}
//Validate medium type
if (!format.tymed.HasFlag(TYMED.TYMED_HGLOBAL))
{
return(NativeMethods.DV_E_TYMED);
}
//Validate DV aspect
if (format.dwAspect != DVASPECT.DVASPECT_CONTENT)
{
return(NativeMethods.DV_E_DVASPECT);
}
//Extract files if not already extracted
if (tempFilenames == null)
{
ExtractFiles();
}
//Get list of dropped files
log.Debug("Setting drop files");
DataObjectHelper.SetDropFiles(ref medium, tempFilenames);
FilesDropped = true;
return(NativeMethods.S_OK);
}
else if (format.cfFormat == NativeMethods.CF_TEXT || format.cfFormat == NativeMethods.CF_UNICODETEXT || format.cfFormat == (ushort)DataObjectHelper.GetClipboardFormat("Csv"))
{
//Do not return text formats -- some applications try to get text before files
medium = new STGMEDIUM();
return(NativeMethods.DV_E_FORMATETC);
}
else
{
int result = innerData.GetData(format, out medium);
log.DebugFormat("Result: {0}", result);
return(result);
}
}
catch (Exception ex)
{
log.Error("Exception in IDataObject.GetData", ex);
medium = new STGMEDIUM();
return(NativeMethods.E_UNEXPECTED);
}
}