public static void DoDragAndDrop(Control dragSource, IEnumerable <DragFileInfo> files)
{
var dataObject = new DataObjectEx();
var fileDescriptors = new List <FileDescriptor>();
var i = 0;
foreach (var file in files)
{
dataObject.SetFileContents(file.Stream, i);
fileDescriptors.Add(new FileDescriptor
{
cFileName = file.FileName,
nFileSizeHigh = (uint)(file.Stream.Length >> 32),
nFileSizeLow = (uint)(file.Stream.Length & 0xFFFFFFFF),
dwFlags = FileDescriptorFlags.FileSize | FileDescriptorFlags.ProgressUi
});
++i;
}
var fileGroupDescriptor = new FileGroupDescriptor(fileDescriptors.Count);
var descriptorSize = Marshal.SizeOf(fileGroupDescriptor) +
Marshal.SizeOf <FileDescriptor>() * fileDescriptors.Count;
using (var descriptorStream = new MemoryStream(descriptorSize))
{
StructToArray(fileGroupDescriptor, descriptorStream);
foreach (var descriptor in fileDescriptors)
{
StructToArray(descriptor, descriptorStream);
}
dataObject.SetData("FileGroupDescriptorW", descriptorStream);
dragSource.DoDragDrop(dataObject, DragDropEffects.Copy);
}
}
private static void StructToArray(FileGroupDescriptor @struct, Stream stream)
{
stream.Write(BitConverter.GetBytes(@struct.cItems), 0, sizeof(int));
}