public static bool GetShellFolder(IntPtr pIDLFolder, out IShellFolder shellFolder)
{
shellFolder = null;
if (PInvoke.ILGetSize(pIDLFolder) == 2)
{
return(0 == PInvoke.SHGetDesktopFolder(out shellFolder));
}
IShellFolder ppshf = null;
Guid riid = ExplorerGUIDs.IID_IShellFolder;
try {
if (PInvoke.SHGetDesktopFolder(out ppshf) == 0)
{
return(0 == ppshf.BindToObject(pIDLFolder, IntPtr.Zero, ref riid, out shellFolder));
}
}
catch {
}
finally {
if (ppshf != null)
{
Marshal.ReleaseComObject(ppshf);
}
}
return(false);
}
public static DragDropEffects DoDragDrop(List <string> lstPaths, Control control, bool fSameDirecotry)
{
DragDropEffects none;
if ((lstPaths == null) || (lstPaths.Count == 0))
{
return(DragDropEffects.None);
}
IShellFolder ppv = null;
object obj2 = null;
List <IntPtr> list = new List <IntPtr>();
try {
IntPtr[] ptrArray;
if (fSameDirecotry)
{
IntPtr ptr2;
IntPtr item = PInvoke.ILCreateFromPath(lstPaths[0]);
list.Add(item);
if ((PInvoke.SHBindToParent(item, ExplorerGUIDs.IID_IShellFolder, out ppv, out ptr2) != 0) || (ppv == null))
{
return(DragDropEffects.None);
}
List <IntPtr> list2 = new List <IntPtr>();
if (ptr2 != IntPtr.Zero)
{
list2.Add(ptr2);
}
for (int i = 1; i < lstPaths.Count; i++)
{
IntPtr ptr3 = PInvoke.ILCreateFromPath(lstPaths[i]);
if (ptr3 != IntPtr.Zero)
{
list.Add(ptr3);
IntPtr ptr4 = PInvoke.ILFindLastID(ptr3);
if (ptr4 != IntPtr.Zero)
{
list2.Add(ptr4);
}
}
}
if (list2.Count == 0)
{
return(DragDropEffects.None);
}
ptrArray = list2.ToArray();
}
else
{
list.AddRange(lstPaths.Select(PInvoke.ILCreateFromPath).Where(ptr5 => ptr5 != IntPtr.Zero));
PInvoke.SHGetDesktopFolder(out ppv);
if ((list.Count == 0) || (ppv == null))
{
return(DragDropEffects.None);
}
ptrArray = list.ToArray();
}
uint rgfReserved = 0;
Guid riid = ExplorerGUIDs.IID_IDataObject;
ppv.GetUIObjectOf(IntPtr.Zero, (uint)ptrArray.Length, ptrArray, ref riid, ref rgfReserved, out obj2);
if (obj2 != null)
{
return(control.DoDragDrop(obj2, DragDropEffects.Link | DragDropEffects.Move | DragDropEffects.Copy));
}
none = DragDropEffects.None;
}
finally {
if (obj2 != null)
{
Marshal.ReleaseComObject(obj2);
}
if (ppv != null)
{
Marshal.ReleaseComObject(ppv);
}
foreach (IntPtr ptr6 in list)
{
if (ptr6 != IntPtr.Zero)
{
PInvoke.CoTaskMemFree(ptr6);
}
}
}
return(none);
}
