[PowerRename] Add PowerRename to directory background context menu (#24522)

* Add PowerRename to directory background context menu

* Fix analyzer error

* Add more checks

.github/actions/spell-check/expect.txt

@@ -742,7 +742,7 @@ IDD
 IDesktop
 IDirect
 idl
-IDLIST
+idlist
 IDOn
 IDR
 idx

installer/PowerToysSetup/PowerRename.wxs

@@ -28,6 +28,9 @@
         <RegistryKey Root="HKLM" Key="SOFTWARE\Classes\AllFileSystemObjects\ShellEx\ContextMenuHandlers\PowerRenameExt">
           <RegistryValue Type="string" Value="{0440049F-D1DC-4E46-B27B-98393D79486B}"/>
         </RegistryKey>
+        <RegistryKey Root="HKLM" Key="SOFTWARE\Classes\Directory\background\ShellEx\ContextMenuHandlers\PowerRenameExt">
+          <RegistryValue Type="string" Value="{0440049F-D1DC-4E46-B27B-98393D79486B}"/>
+        </RegistryKey>
 
       </Component>
     </DirectoryRef>

src/modules/powerrename/PowerRenameContextMenu/dllmain.cpp

@@ -93,12 +93,6 @@ public:
     {
         *cmdState = ECS_ENABLED;
 
-        // We've observed that it's possible that a null gets passed instead of an empty array. Just don't show the context menu in this case.
-        if (nullptr == selection) {
-            *cmdState = ECS_HIDDEN;
-            return S_OK;
-        }
-
         if (!CSettingsInstance().GetEnabled())
         {
             *cmdState = ECS_HIDDEN;
@@ -112,6 +106,12 @@ public:
             return S_OK;
         }
 
+        // When right clicking directory background, selection is empty. This prevents checking if there
+        // are renamable items, but internal PowerRename logic will prevent renaming non-renamable items anyway.
+        if (nullptr == selection) {
+            return S_OK;
+        }
+
         // Check if at least one of the selected items is actually renamable.
         if (!ShellItemArrayContainsRenamableItem(selection))
         {

src/modules/powerrename/dll/PowerRenameExt.cpp

@@ -46,14 +46,26 @@ HRESULT CPowerRenameMenu::s_CreateInstance(_In_opt_ IUnknown*, _In_ REFIID riid,
 }
 
 // IShellExtInit
-HRESULT CPowerRenameMenu::Initialize(_In_opt_ PCIDLIST_ABSOLUTE, _In_ IDataObject* pdtobj, HKEY)
+HRESULT CPowerRenameMenu::Initialize(_In_opt_ PCIDLIST_ABSOLUTE idlist, _In_ IDataObject* pdtobj, HKEY)
 {
     // Check if we have disabled ourselves
     if (!CSettingsInstance().GetEnabled())
         return E_FAIL;
 
     // Cache the data object to be used later
+    if (idlist != NULL)
+    {
+        CComPtr<IShellItemArray> spsia;
+        if (SUCCEEDED(SHCreateShellItemArrayFromIDLists(1, &idlist, &spsia)) && spsia != NULL)
+        {
+            spsia->BindToHandler(NULL, BHID_DataObject, IID_IDataObject, reinterpret_cast<void**>(&m_spdo));
+        }
+    }
+    else
+    {
         m_spdo = pdtobj;
+    }
+
     return S_OK;
 }
 
@@ -124,7 +136,7 @@ HRESULT CPowerRenameMenu::RunPowerRename(CMINVOKECOMMANDINFO* pici, IShellItemAr
     HRESULT hr = E_FAIL;
 
     if (CSettingsInstance().GetEnabled() &&
-        (IS_INTRESOURCE(pici->lpVerb)) &&
+        pici && (IS_INTRESOURCE(pici->lpVerb)) &&
         (LOWORD(pici->lpVerb) == 0))
     {
         Trace::Invoked();
@@ -163,14 +175,7 @@ HRESULT CPowerRenameMenu::RunPowerRename(CMINVOKECOMMANDINFO* pici, IShellItemAr
         startupInfo.cb = sizeof(STARTUPINFO);
         startupInfo.hStdInput = hReadPipe;
         startupInfo.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;
-        if (pici)
-        {
         startupInfo.wShowWindow = static_cast<WORD>(pici->nShow);
-        }
-        else
-        {
-            startupInfo.wShowWindow = SW_SHOWNORMAL;
-        }
 
         PROCESS_INFORMATION processInformation;
 
@@ -200,6 +205,8 @@ HRESULT CPowerRenameMenu::RunPowerRename(CMINVOKECOMMANDINFO* pici, IShellItemAr
 
         // psiItemArray is NULL if called from InvokeCommand. This part is used for the MSI installer. It is not NULL if it is called from Invoke (MSIX).
         if (!psiItemArray)
+        {
+            if (m_spdo)
             {
                 // Stream the input files
                 HDropIterator i(m_spdo);
@@ -212,6 +219,7 @@ HRESULT CPowerRenameMenu::RunPowerRename(CMINVOKECOMMANDINFO* pici, IShellItemAr
                     writePipe.Write(fileName, fileName.GetLength() * sizeof(TCHAR));
                 }
             }
+        }
         else
         {
             //m_pdtobj will be NULL when invoked from the MSIX build as Initialize is never called (IShellExtInit functions aren't called in case of MSIX).

src/modules/powerrename/lib/Helpers.cpp

@@ -551,7 +551,7 @@ bool DataObjectContainsRenamableItem(_In_ IUnknown* dataSource)
 {
     bool hasRenamable = false;
     CComPtr<IShellItemArray> spsia;
-    if (SUCCEEDED(GetShellItemArrayFromDataObject(dataSource, &spsia)))
+    if (dataSource && SUCCEEDED(GetShellItemArrayFromDataObject(dataSource, &spsia)))
     {
         CComPtr<IEnumShellItems> spesi;
         if (SUCCEEDED(spsia->EnumItems(&spesi)))