internal static string[] GetFilenamesAnsi(NativeMethods.IDataObject data)
{
IntPtr fgdaPtr = IntPtr.Zero;
try
{
//Define FileGroupDescriptor format
FORMATETC format = new FORMATETC();
format.cfFormat = (short)System.Windows.Forms.DataFormats.GetFormat("FileGroupDescriptor").Id;
format.dwAspect = DVASPECT.DVASPECT_CONTENT;
format.lindex = -1;
format.ptd = IntPtr.Zero;
format.tymed = TYMED.TYMED_ISTREAM | TYMED.TYMED_ISTORAGE | TYMED.TYMED_HGLOBAL;
//Query if format exists in data
if (data.QueryGetData(format) != NativeMethods.S_OK)
{
return(null);
}
//Get data into medium
STGMEDIUM medium = new STGMEDIUM();
data.GetData(format, out medium);
//Read medium into byte array
byte[] bytes;
using (MemoryStream stream = new MemoryStream())
{
DataObjectHelper.ReadMediumIntoStream(medium, stream);
bytes = new byte[stream.Length];
stream.Seek(0, SeekOrigin.Begin);
stream.Read(bytes, 0, bytes.Length);
}
//Copy the file group descriptor into unmanaged memory
fgdaPtr = Marshal.AllocHGlobal(bytes.Length);
Marshal.Copy(bytes, 0, fgdaPtr, bytes.Length);
//Marshal the unmanaged memory to a FILEGROUPDESCRIPTORA struct
object fgdObj = Marshal.PtrToStructure(fgdaPtr, typeof(NativeMethods.FILEGROUPDESCRIPTORA));
NativeMethods.FILEGROUPDESCRIPTORA fgd = (NativeMethods.FILEGROUPDESCRIPTORA)fgdObj;
//Create an array to store file names
string[] filenames = new string[fgd.cItems];
//Get the pointer to the first file descriptor
IntPtr fdPtr = (IntPtr)((int)fgdaPtr + Marshal.SizeOf(fgdaPtr));
//Loop for the number of files acording to the file group descriptor
for (int fdIndex = 0; fdIndex < fgd.cItems; fdIndex++)
{
//Marshal the pointer to the file descriptor as a FILEDESCRIPTORA struct
object fdObj = Marshal.PtrToStructure(fdPtr, typeof(NativeMethods.FILEDESCRIPTORA));
NativeMethods.FILEDESCRIPTORA fd = (NativeMethods.FILEDESCRIPTORA)fdObj;
//Get filename of file descriptor and put in array
filenames[fdIndex] = fd.cFileName;
//Move the file descriptor pointer to the next file descriptor
fdPtr = (IntPtr)((int)fdPtr + Marshal.SizeOf(fd));
}
return(filenames);
}
finally
{
Marshal.FreeHGlobal(fgdaPtr);
}
}
internal static string[] GetFilenamesUnicode(NativeMethods.IDataObject data)
{
log.Debug("Getting filenames (Unicode)");
IntPtr fgdaPtr = IntPtr.Zero;
STGMEDIUM medium = new STGMEDIUM();
try
{
//Define FileGroupDescriptorW format
FORMATETC format = new FORMATETC();
format.cfFormat = (short)System.Windows.Forms.DataFormats.GetFormat("FileGroupDescriptorW").Id;
format.dwAspect = DVASPECT.DVASPECT_CONTENT;
format.lindex = -1;
format.ptd = IntPtr.Zero;
format.tymed = TYMED.TYMED_ISTREAM | TYMED.TYMED_ISTORAGE | TYMED.TYMED_HGLOBAL;
//Query if format exists in data
if (data.QueryGetData(format) != NativeMethods.S_OK)
{
log.Debug("No filenames found");
return(null);
}
//Get data into medium
medium = new STGMEDIUM();
data.GetData(format, out medium);
//Read medium into byte array
log.Debug("Reading structure into memory stream");
byte[] bytes;
using (MemoryStream stream = new MemoryStream())
{
DataObjectHelper.ReadMediumIntoStream(medium, stream);
bytes = new byte[stream.Length];
stream.Seek(0, SeekOrigin.Begin);
stream.Read(bytes, 0, bytes.Length);
}
//Copy the file group descriptor into unmanaged memory
log.Debug("Copying structure into unmanaged memory");
fgdaPtr = Marshal.AllocHGlobal(bytes.Length);
if (fgdaPtr == IntPtr.Zero)
{
throw new OutOfMemoryException();
}
Marshal.Copy(bytes, 0, fgdaPtr, bytes.Length);
//Marshal the unmanaged memory to a FILEGROUPDESCRIPTORW struct
log.Debug("Marshaling unmanaged memory into FILEGROUPDESCRIPTORW struct");
object fgdObj = Marshal.PtrToStructure(fgdaPtr, typeof(NativeMethods.FILEGROUPDESCRIPTORW));
NativeMethods.FILEGROUPDESCRIPTORW fgd = (NativeMethods.FILEGROUPDESCRIPTORW)fgdObj;
log.Debug(string.Format("Files found: {0}", fgd.cItems));
//Create an array to store file names
string[] filenames = new string[fgd.cItems];
//Get the pointer to the first file descriptor
IntPtr fdPtr = IntPtr.Add(fgdaPtr, sizeof(uint));
//Loop for the number of files acording to the file group descriptor
for (int fdIndex = 0; fdIndex < fgd.cItems; fdIndex++)
{
log.DebugFormat("Getting filename {0}", fdIndex);
//Marshal the pointer to the file descriptor as a FILEDESCRIPTORW struct
object fdObj = Marshal.PtrToStructure(fdPtr, typeof(NativeMethods.FILEDESCRIPTORW));
NativeMethods.FILEDESCRIPTORW fd = (NativeMethods.FILEDESCRIPTORW)fdObj;
//Get filename of file descriptor and put in array
filenames[fdIndex] = fd.cFileName;
//Move the file descriptor pointer to the next file descriptor
fdPtr = IntPtr.Add(fdPtr, Marshal.SizeOf(fd));
}
log.DebugFormat("Filenames found: {0}", string.Join(", ", filenames));
return(filenames);
}
finally
{
//Release all unmanaged objects
Marshal.FreeHGlobal(fgdaPtr);
if (medium.pUnkForRelease == null)
{
NativeMethods.ReleaseStgMedium(ref medium);
}
}
}
