/// <summary>Gets the array of FileNames from the FileGroupDescriptors format.</summary>
public static string[] GetFileContentNames(this System.Windows.Forms.IDataObject data)
{
var names = new string[data.GetFileContentCount()];
if (names.Length != 0)
{
var bytes = data.GetFileGroupDescriptor().ToArray();
IntPtr fgdPtr = IntPtr.Zero;
try {
fgdPtr = Marshal.AllocHGlobal(bytes.Length);
int offset = Marshal.SizeOf(typeof(UInt32));
int size = Marshal.SizeOf(typeof(FILEDESCRIPTORW));
for (int i = 0; i < names.Length; i++)
{
var fd = (FILEDESCRIPTORW)Marshal.PtrToStructure(fgdPtr + offset + (i * size), typeof(FILEDESCRIPTORW));
names[i] = fd.cFileName;
}
} finally {
if (fgdPtr != IntPtr.Zero)
{
Marshal.FreeHGlobal(fgdPtr);
}
}
}
return(names);
}
/// <summary>Gets the number of files available in the FileGroupDescriptor format.</summary>
public static int GetFileContentCount(this System.Windows.Forms.IDataObject data)
{
// File count is stored as an UInt32 in the FileGroupDescriptor format
MemoryStream ms = data.GetFileGroupDescriptor();
if (ms == null)
{
return(0);
}
using (var reader = new BinaryReader(ms)) {
return((int)reader.ReadUInt32()); // Assume this won't overflow!
}
}
