public static MemoryStream GetFileDescriptor(DragFileInfo fileInfo)
{
MemoryStream stream = new MemoryStream();
stream.Write(BitConverter.GetBytes(1), 0, sizeof(UInt32));
FILEDESCRIPTOR fileDescriptor = new FILEDESCRIPTOR();
fileDescriptor.cFileName = fileInfo.FileName;
Int64 fileWriteTimeUtc = fileInfo.WriteTime.ToFileTimeUtc();
fileDescriptor.ftLastWriteTime.dwHighDateTime = (Int32)(fileWriteTimeUtc >> 32);
fileDescriptor.ftLastWriteTime.dwLowDateTime = (Int32)(fileWriteTimeUtc & 0xFFFFFFFF);
fileDescriptor.nFileSizeHigh = (UInt32)(fileInfo.FileSize >> 32);
fileDescriptor.nFileSizeLow = (UInt32)(fileInfo.FileSize & 0xFFFFFFFF);
fileDescriptor.dwFlags = FD_WRITESTIME | FD_FILESIZE | FD_PROGRESSUI;
Int32 fileDescriptorSize = Marshal.SizeOf(fileDescriptor);
IntPtr fileDescriptorPointer = Marshal.AllocHGlobal(fileDescriptorSize);
Byte[] fileDescriptorByteArray = new Byte[fileDescriptorSize];
try
{
Marshal.StructureToPtr(fileDescriptor, fileDescriptorPointer, true);
Marshal.Copy(fileDescriptorPointer, fileDescriptorByteArray, 0, fileDescriptorSize);
}
finally
{
Marshal.FreeHGlobal(fileDescriptorPointer);
}
stream.Write(fileDescriptorByteArray, 0, fileDescriptorByteArray.Length);
return(stream);
}
private void packTreeView_ItemDrag(object sender, ItemDragEventArgs e)
{
// Proceed with the drag-and-drop, passing the selected items for
if (e.Button == MouseButtons.Left && e.Item is System.Windows.Forms.TreeNode && e.Item != null &&
((System.Windows.Forms.TreeNode)e.Item).Tag is PackedFile && ((System.Windows.Forms.TreeNode)e.Item).Tag != null)
{
var file = ((System.Windows.Forms.TreeNode)e.Item).Tag as PackedFile;
if (file != null)
{
var dataObject = new DataObject();
var filesInfo = new DragFileInfo(file.FullPath, file.Size);
using (MemoryStream infoStream = DragDropHelper.GetFileDescriptor(filesInfo),
contentStream = DragDropHelper.GetFileContents(file.Data))
{
dataObject.SetData(DragDropHelper.CFSTR_FILEDESCRIPTORW, infoStream);
dataObject.SetData(DragDropHelper.CFSTR_FILECONTENTS, contentStream);
dataObject.SetData(DragDropHelper.CFSTR_PERFORMEDDROPEFFECT, null);
DoDragDrop(dataObject, DragDropEffects.All);
}
}
}
}
