/// <summary>
/// This method will use the GetUIObjectOf method of IShellFolder to obtain the IDropTarget of a
/// ShellItem.
/// </summary>
/// <param name="item">The item for which to obtain the IDropTarget</param>
/// <param name="dropTargetPtr">A pointer to the returned IDropTarget</param>
/// <returns>the IDropTarget from the ShellItem</returns>
public static bool GetIDropTarget(ShellItem item, out IntPtr dropTargetPtr, out ShellDll.IDropTarget dropTarget)
{
ShellItem parent = item.ParentItem != null ? item.ParentItem : item;
if (parent.ShellFolder.GetUIObjectOf(
IntPtr.Zero,
1,
new IntPtr[] { item.PIDLRel.Ptr },
ref ShellAPI.IID_IDropTarget,
IntPtr.Zero,
out dropTargetPtr) == ShellAPI.S_OK)
{
dropTarget =
(ShellDll.IDropTarget)Marshal.GetTypedObjectForIUnknown(dropTargetPtr, typeof(ShellDll.IDropTarget));
return true;
}
else
{
dropTarget = null;
dropTargetPtr = IntPtr.Zero;
return false;
}
}
/// <summary>
/// Convert CSIDL to PIDL
/// </summary>
internal static PIDL CSIDLtoPIDL(ShellDll.ShellAPI.CSIDL csidl)
{
IntPtr ptrAddr;
PIDL pidl;
if (csidl == ShellAPI.CSIDL.MYDOCUMENTS)
return PathtoPIDL(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments));
{
int RetVal = ShellAPI.SHGetSpecialFolderLocation(IntPtr.Zero, csidl, out ptrAddr);
if (ptrAddr != IntPtr.Zero)
{
pidl = new PIDL(ptrAddr, false);
return pidl;
}
else throw new ArgumentException("Invalid csidl " + RetVal);
}
//return null;
}
public static extern int RegisterDragDrop(
IntPtr hWnd,
ShellDll.IDropTarget IdropTgt);
/// <summary>
/// This method will use the GetUIObjectOf method of IShellFolder to obtain the IDropTarget of a
/// ShellItem.
/// </summary>
/// <param name="item">The item for which to obtain the IDropTarget</param>
/// <param name="dropTargetPtr">A pointer to the returned IDropTarget</param>
/// <returns>the IDropTarget from the ShellItem</returns>
public static bool GetIDropTarget(IntPtr[] pidls, IShellFolder parent, out IntPtr dropTargetPtr, out ShellDll.IDropTarget dropTarget)
{
if (parent.GetUIObjectOf(
IntPtr.Zero,
1,
pidls,
ref ShellAPI.IID_IDropTarget,
IntPtr.Zero,
out dropTargetPtr) == ShellAPI.S_OK)
{
dropTarget =
(ShellDll.IDropTarget)Marshal.GetTypedObjectForIUnknown(dropTargetPtr, typeof(ShellDll.IDropTarget));
return true;
}
else
{
dropTarget = null;
dropTargetPtr = IntPtr.Zero;
return false;
}
}