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问题:

I have a namespace extension, which provides a virtual view of files/folders in a server.

In the IContextMenu::QueryContextMenu() I have added some of the custom menu items.

I have also set couple of SGAOF flags in the IShellFolder::GetAttributesOf() to get the rename, delete, and properties, in the context menu.

Is there any way I can get the "Send To" option in the context menu for items in my namespace extension? and How do I handle these commands once these are enabled?. Please advise.

This is the code I tried as Denis Anisimov suggested

    const CLSID SendToCLSID = { 0x7BA4C740, 0x9E81, 0x11CF, { 0x99, 0xD3, 0x00, 0xAA, 0x00, 0x4A, 0xE8, 0x37 } };

    HRESULT CMyNSEContextMenu::Initialize(PCIDLIST_ABSOLUTE pidlFolder , IDataObject *pDataObj, HKEY  hkeyProgID )
    {
        OutputDebugString(L"CMyNSEContextMenu::Initialize\n");
        //Other initialization code
        ...
        ...

        if (_pdtobj)
        {
            _pdtobj->Release();
            _pdtobj = NULL;
        }

        _mpidlFolder = pidlFolder;
        _pdtobj = pDataObj;
        if (pDataObj)
        {
            _pdtobj->AddRef();
            CoCreateInstance(SendToCLSID, NULL, CLSCTX_INPROC_SERVER, IID_IContextMenu, (LPVOID*)&_pSendToMenu);
        }
        return S_OK;
    }

    HRESULT CMyNSEContextMenu::QueryContextMenu(HMENU hmenu, UINT indexMenu, UINT idCmdFirst, UINT  idCmdLast , UINT  uFlags )
    {
        OutputDebugString(L"CMyNSEContextMenu::QueryContextMenu\n");
        UNREFERENCED_PARAMETER(indexMenu);
        UNREFERENCED_PARAMETER(idCmdFirst);
        //Get File Name
        IShellItemArray *psia=NULL;
        HRESULT    hr;
        USHORT items = 0;

        //Adding other menu items


        AddMenuItem(hmenu, 
                    indexMenu++, 
                    idCmdFirst + MENUVERB_XXX, 
                    IDS_COMMAND_XXX, 
                    IDB_XXX);
        items++;

        IShellExtInit *pShellExtInitSendTo = NULL;

        _pSendToMenu->QueryInterface(IID_IShellExtInit, (LPVOID*)&pShellExtInitSendTo);
        pShellExtInitSendTo->Initialize(NULL, _pdtobj, 0); // your IDataObject with CFSTR_SHELLIDLIST format)
        hr = _pSendToMenu->QueryContextMenu(hmenu, indexMenu, idCmdFirst, idCmdLast, uFlags);
        if (SUCCEEDED(hr))
        {
            items += HRESULT_CODE(hr);
        }

        return MAKE_HRESULT(SEVERITY_SUCCESS, 0, (USHORT)(items));
    }

    HRESULT CMyNSEContextMenu::HandleMenuMsg(
        UINT uMsg,
        WPARAM wParam,
        LPARAM lParam
        )
    {
        IContextMenu2 *pSendToMenu = NULL;
        _pSendToMenu->QueryInterface(IID_IContextMenu2, (LPVOID*)&pSendToMenu);

        return pSendToMenu->HandleMenuMsg(uMsg,wParam,lParam);
    }

    HRESULT CMyNSEContextMenu::HandleMenuMsg2(
        UINT uMsg,
        WPARAM wParam,
        LPARAM lParam,
        LRESULT *plResult
        )
    {
        IContextMenu3 *pSendToMenu = NULL;
        _pSendToMenu->QueryInterface(IID_IContextMenu3, (LPVOID*)&pSendToMenu);
        return pSendToMenu->HandleMenuMsg2(uMsg, wParam, lParam, plResult);
    }
HRESULT CMyNSEContextMenu::GetCommandString(UINT_PTR  idCmd , UINT uType , UINT *  pRes , LPSTR  pszName , UINT  cchMax )
{
    OutputDebugString(L"CMyNSEContextMenu::GetCommandString\n");

    return _pSendToMenu->GetCommandString(idCmd, uType, pRes, pszName, cchMax);

}

The default context menu is created as part of GetUIObjectOf. and the instance of MyNSEContextMenu class is through the Classfactory.

HRESULT CMyNSEShellFolder::GetUIObjectOf(HWND hwnd, UINT cidl, PCUITEMID_CHILD_ARRAY apidl,
                                             REFIID riid, UINT * /* prgfInOut */, void **ppv)
{
    OutputDebugString(L"CMyNSEShellFolder::GetUIObjectOf\n");
    *ppv = NULL;
    HRESULT hr = E_NOINTERFACE;

    if (riid == IID_IContextMenu)
    {
        // The default context menu will call back for IQueryAssociations to determine the
        // file associations with which to populate the menu.
        DEFCONTEXTMENU const dcm = { hwnd, NULL, m_pidl, static_cast<IShellFolder2 *>(this),
                               cidl, apidl, NULL, 0, NULL };
        hr = SHCreateDefaultContextMenu(&dcm, riid, ppv);
    }   
    //Others
    ....
    ....
    else if (riid == IID_IQueryAssociations)
    {
            else
            {
                ASSOCIATIONELEMENT const rgAssocItem[] =
                {
                    { ASSOCCLASS_PROGID_STR, NULL, L"MyNSE_Type"},
                };
                hr = AssocCreateForClasses(rgAssocItem, ARRAYSIZE(rgAssocItem), riid, ppv);
            }
    }
    ...
    ...
    return hr;
}

//Called from the class factory     
HRESULT CMyNSEContextMenu_CreateInstance(REFIID riid, void **ppv)
{
    *ppv = NULL;
    CMyNSEContextMenu* pContextMenu = new (std::nothrow) CMyNSEContextMenu();
    HRESULT hr = pContextMenu ? S_OK : E_OUTOFMEMORY;
    if (SUCCEEDED(hr))
    {
        hr = pContextMenu->QueryInterface(riid, ppv);
        pContextMenu->Release();
    }
    return hr;
}

Related registries written are as follows

HKEY_LOCAL_MACHINE,   L"Software\\Classes\\CLSID\\%s",                  szContextMenuClassID,    NULL,                   (LPBYTE)g_szExtTitle,       REG_SZ,
HKEY_LOCAL_MACHINE,   L"Software\\Classes\\CLSID\\%s\\InprocServer32",  szContextMenuClassID,    NULL,                   (LPBYTE)L"%s",              REG_SZ,
HKEY_LOCAL_MACHINE,   L"Software\\Classes\\CLSID\\%s\\InprocServer32",  szContextMenuClassID,    L"ThreadingModel",      (LPBYTE)L"Apartment",       REG_SZ,

        HKEY_LOCAL_MACHINE, L"Software\\Classes\\CLSID\\%s\\ProgID", szFolderViewImplClassID, NULL, (LPBYTE)L"MyNSE_Type", REG_SZ,

// For performance, only context menu verbs that register this are considered when the user double-clicks.
HKEY_CLASSES_ROOT,   L"CLSID\\%s\\ShellEx\\MayChangeDefaultMenu",                szContextMenuClassID, NULL,  (LPBYTE)L"",                  REG_SZ,
// register the context menu handler under the MyNSE_Type type.
HKEY_CLASSES_ROOT,   L"MyNSE_Type\\shellex\\ContextMenuHandlers\\%s",  szContextMenuClassID, NULL,  (LPBYTE)szContextMenuClassID, REG_SZ,

回答1:

SendTo is just simple shell extension which implements IContextMenu(2,3). CLSID of extension is {7BA4C740-9E81-11CF-99D3-00AA004AE837} in Windows 7 (dont forget to check correct CLSID in other Windows versions you want to support). So just use something like this:

function TMenuWithSentTo.QueryContextMenu(Menu: HMENU; indexMenu, idCmdFirst, idCmdLast, uFlags: UINT): HResult;
const
  SendToCLSID: TGUID = '{7BA4C740-9E81-11CF-99D3-00AA004AE837}';
var
  ShellExtInit: IShellExtInit;
begin
  Result := 0;

  // Add you menu items here

  CoCreateInstance(SendToCLSID, nil, CLSCTX_INPROC_SERVER, IContextMenu, FSendToMenu);
  FSendToMenu.QueryInterface(IShellExtInit, ShellExtInit);
  ShellExtInit.Initialize(nil, FDataObject, 0); // your IDataObject with CFSTR_SHELLIDLIST format 
  Result := Result + FSendToMenu.QueryContextMenu(Menu, indexMenu, idCmdFirst, idCmdLast, uFlags);

  // Add you menu items here
end;

function TMenuWithSentTo.InvokeCommand(var lpici: TCMInvokeCommandInfo): HResult;
begin
  if IsMyCommand(lpici) then
    begin
      // Process your command here
      Result := S_OK;
    end
  else
    Result := FSendToMenu.InvokeCommand(lpici);
end;

function TMenuWithSentTo.GetCommandString(idCmd: UINT_PTR; uFlags: UINT; pwReserved: PUINT; pszName: LPSTR; cchMax: UINT): HResult;
begin
  if IsMyCommandID(idCmd) then
    begin
      // Process your command here
      Result := S_OK;
    end
  else
    FSendToMenu.GetCommandString(idCmd);
end;

function TMenuWithSentTo.HandleMenuMsg(uMsg: UINT; WParam: WPARAM; LParam: LPARAM): HResult;
var
  SendToMenu2: IContextMenu2;
begin
  if IsMyMessage(uMsg, WParam, LParam) then
    begin
      // Process your command here
      Result := S_OK;
    end
  else
    begin
      FSendToMenu.QueryInterface(IContextMenu2, SendToMenu2);
      Result := SendToMenu2.HandleMenuMsg(uMsg, WParam, LParam);
    end;
end;

function TMenuWithSentTo.HandleMenuMsg2(uMsg: UINT; wParam: WPARAM; lParam: LPARAM; var lpResult: LRESULT): HResult;
var
  SendToMenu3: IContextMenu3;
begin
  if IsMyMessage(uMsg, WParam, LParam) then
    begin
      // Process your command here
      Result := S_OK;
    end
  else
    begin
      FSendToMenu.QueryInterface(IContextMenu3, SendToMenu3);
      Result := SendToMenu3.HandleMenuMsg(uMsg, WParam, LParam);
    end;
end;

But your should be ready that some command of SendTo will be hidden and some will not work correctly because some of them requests real files but you have virtual only.

Normal Send to menu:

Send to menu in NSE:

回答2:

The simple way is to add a shortcut to the SendTo folder. To find that, simply paste %APPDATA%\Microsoft\Windows\SendTo into an Explorer window.

This only works if you have a command line program that takes a file name as an argument. If this is not what you need please edit your question with further details of how your extension code is accessed. Also, if this is C# please tag it so.

The registry key for SendTo can be found at HKEY_CLASSES_ROOT\AllFilesystemObjects\shellex\ContextMenuHandlers. The value since at least Vista and up to Windows 8 is {7BA4C740-9E81-11CF-99D3-00AA004AE837}. You can write a shell extension for this key. I have done this in the past, but don't have any source code that would help. The documentation is here: http://msdn.microsoft.com/en-us/library/windows/desktop/cc144067%28v=vs.85%29.aspx.