// 类型转换 PWideChar，不用StringToOleStr，测试存在内存泄
  Function A2U(const s: String): PWideChar;
  begin
　　if s = '' then begin
  　　result:= nil;
  　　exit;
　　end;
　　result:= AllocMem((Length(s) + 1) * sizeOf(widechar));
　　StringToWidechar(s, result, Length(s) * sizeOf(widechar) + 1);
  end;

//=============================================================================

function PidlFree(var IdList: PItemIdList): Boolean;
var
  Malloc: IMalloc;
begin
  Result := False;
  if IdList = nil then
　　Result := True
  else
  begin
　　if Succeeded(SHGetMalloc(Malloc)) and (Malloc.DidAlloc(IdList) > 0) then
　　begin
  　　Malloc.Free(IdList);
  　　IdList := nil;
  　　Result := True;
　　end;
  end;
end;

function MenuCallback(Wnd: HWND; Msg: UINT; wParam: WPARAM; lParam: LPARAM):
  LRESULT; stdcall;
var
  ContextMenu2: IContextMenu2;
begin
  case Msg of
　　WM_CREATE:
  　　begin
    　　ContextMenu2 := IContextMenu2(PCreateStruct(lParam).lpCreateParams);
    　　SetWindowLong(Wnd, GWL_USERDATA, Longint(ContextMenu2));
    　　Result := DefWindowProc(Wnd, Msg, wParam, lParam);
  　　end;
　　WM_INITMENUPOPUP:
  　　begin
    　　ContextMenu2 := IContextMenu2(GetWindowLong(Wnd, GWL_USERDATA));
    　　ContextMenu2.HandleMenuMsg(Msg, wParam, lParam);
    　　Result := 0;
  　　end;
　　WM_DRAWITEM, WM_MEASUREITEM:
  　　begin
    　　ContextMenu2 := IContextMenu2(GetWindowLong(Wnd, GWL_USERDATA));
    　　ContextMenu2.HandleMenuMsg(Msg, wParam, lParam);
    　　Result := 1;
  　　end;
  else
　　Result := DefWindowProc(Wnd, Msg, wParam, lParam);
  end;
end;

function CreateMenuCallbackWnd(const ContextMenu: IContextMenu2): HWND;
const
  IcmCallbackWnd = 'ICMCALLBACKWND';
var
  WndClass: TWndClass;
begin
  FillChar(WndClass, SizeOf(WndClass), #0);
  WndClass.lpszClassName := PChar(IcmCallbackWnd);
  WndClass.lpfnWndProc := @MenuCallback;
  WndClass.hInstance := HInstance;
  Windows.RegisterClass(WndClass);
  Result := CreateWindow(IcmCallbackWnd, IcmCallbackWnd, WS_POPUPWINDOW, 0,
　　0, 0, 0, 0, 0, HInstance, Pointer(ContextMenu));
end;

function DisplayContextMenuPidl(const Handle: HWND; const Folder: IShellFolder;
  Item: PItemIdList; Pos: TPoint): Boolean;
var
  Cmd: Cardinal;
  ContextMenu: IContextMenu;
  ContextMenu2: IContextMenu2;
  Menu: HMENU;
  CommandInfo: TCMInvokeCommandInfo;
  CallbackWindow: HWND;
begin
  Result := False;
  if (Item = nil) or (Folder = nil) then
　　Exit;
  Folder.GetUIObjectOf(Handle, 1, Item, IID_IContextMenu, nil,
　　Pointer(ContextMenu));
  if ContextMenu <> nil then
  begin
　　Menu := CreatePopupMenu;
　　if Menu <> 0 then
　　begin
  　　if Succeeded(ContextMenu.QueryContextMenu(Menu, 0, 1, $7FFF, CMF_EXPLORE))
    　　then
  　　begin
    　　CallbackWindow := 0;
    　　if Succeeded(ContextMenu.QueryInterface(IContextMenu2, ContextMenu2))
      　　then
    　　begin
      　　CallbackWindow := CreateMenuCallbackWnd(ContextMenu2);
    　　end;
    　　ClientToScreen(Handle, Pos);
    　　Cmd := Cardinal(TrackPopupMenu(Menu, TPM_LEFTALIGN or TPM_LEFTBUTTON or
      　　TPM_RIGHTBUTTON or TPM_RETURNCMD, Pos.X, Pos.Y, 0, CallbackWindow,
      　　nil));
    　　if Cmd <> 0 then
    　　begin
      　　FillChar(CommandInfo, SizeOf(CommandInfo), #0);
      　　CommandInfo.cbSize := SizeOf(TCMInvokeCommandInfo);
      　　CommandInfo.hwnd := Handle;
      　　CommandInfo.lpVerb := MakeIntResource(Cmd - 1);
      　　CommandInfo.nShow := SW_SHOWNORMAL;
      　　Result := Succeeded(ContextMenu.InvokeCommand(CommandInfo));
    　　end;
    　　if CallbackWindow <> 0 then
      　　DestroyWindow(CallbackWindow);
  　　end;
  　　DestroyMenu(Menu);
　　end;
  end;
end;

function PathAddSeparator(const Path: string): string;
begin
  Result := Path;
  if (Length(Path) = 0) or (AnsiLastChar(Path) <> ShenPathSeparator) then
　　Result := Path + ShenPathSeparator;
end;