shell32: Properly fail for unsupported interfaces in IShellView::GetItemObject.

dlls/shell32/shlview.c

@@ -1990,27 +1990,37 @@ static HRESULT WINAPI IShellView_fnSelectItem(
 static HRESULT WINAPI IShellView_fnGetItemObject(IShellView2 * iface, UINT uItem, REFIID riid, LPVOID *ppvOut)
 {
     IShellViewImpl *This = (IShellViewImpl *)iface;
+    HRESULT hr = E_NOINTERFACE;
 
-	TRACE("(%p)->(uItem=0x%08x,\n\tIID=%s, ppv=%p)\n",This, uItem, debugstr_guid(riid), ppvOut);
+    TRACE("(%p)->(0x%08x, %s, %p)\n",This, uItem, debugstr_guid(riid), ppvOut);
 
     *ppvOut = NULL;
 
     switch(uItem)
     {
     case SVGIO_BACKGROUND:
+
+        if (IsEqualIID(&IID_IContextMenu, riid))
+        {
             *ppvOut = ISvBgCm_Constructor(This->pSFParent, FALSE);
+            hr = S_OK;
+        }
+        else
+            FIXME("unsupported interface requested %s\n", debugstr_guid(riid));
+
         break;
 
     case SVGIO_SELECTION:
 	ShellView_GetSelections(This);
-	    IShellFolder_GetUIObjectOf(This->pSFParent, This->hWnd, This->cidl, (LPCITEMIDLIST*)This->apidl, riid, 0, ppvOut);
+	hr = IShellFolder_GetUIObjectOf(This->pSFParent, This->hWnd, This->cidl, (LPCITEMIDLIST*)This->apidl, riid, 0, ppvOut);
 	break;
+
+    default:
+        FIXME("unimplemented for uItem = 0x%08x\n", uItem);
     }
     TRACE("-- (%p)->(interface=%p)\n",This, *ppvOut);
 
-	if(!*ppvOut) return E_OUTOFMEMORY;
-
-	return S_OK;
+    return hr;
 }
 
 static HRESULT WINAPI IShellView2_fnGetView(IShellView2* iface, SHELLVIEWID *view_guid, ULONG view_type)

dlls/shell32/tests/shlview.c

@@ -36,6 +36,8 @@
 #include "ocidl.h"
 #include "oleauto.h"
 
+#include "initguid.h"
+
 #include "wine/test.h"
 
 #include "msg.h"
@@ -43,6 +45,8 @@
 #define LISTVIEW_SEQ_INDEX  0
 #define NUM_MSG_SEQUENCES   1
 
+DEFINE_GUID(IID_IPersistHistory, 0x91a565c1, 0xe38f, 0x11d0, 0x94, 0xbf, 0x00, 0xa0, 0xc9, 0x05, 0x5c, 0xbf);
+
 static struct msg_sequence *sequences[NUM_MSG_SEQUENCES];
 
 static LRESULT WINAPI listview_subclass_proc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
@@ -501,6 +505,43 @@ if (0)
     IShellFolder_Release(desktop);
 }
 
+static void test_GetItemObject(void)
+{
+    IShellFolder *desktop;
+    IShellView *view;
+    IUnknown *unk;
+    HRESULT hr;
+
+    hr = SHGetDesktopFolder(&desktop);
+    ok(hr == S_OK, "got (0x%08x)\n", hr);
+
+    hr = IShellFolder_CreateViewObject(desktop, NULL, &IID_IShellView, (void**)&view);
+    ok(hr == S_OK, "got (0x%08x)\n", hr);
+
+    /* from documentation three interfaces are supported for SVGIO_BACKGROUND:
+       IContextMenu, IDispatch, IPersistHistory */
+    hr = IShellView_GetItemObject(view, SVGIO_BACKGROUND, &IID_IContextMenu, (void**)&unk);
+    ok(hr == S_OK, "got (0x%08x)\n", hr);
+    IUnknown_Release(unk);
+
+    unk = NULL;
+    hr = IShellView_GetItemObject(view, SVGIO_BACKGROUND, &IID_IDispatch, (void**)&unk);
+    todo_wine ok(hr == S_OK || broken(hr == E_NOTIMPL) /* NT4 */, "got (0x%08x)\n", hr);
+    if (unk) IUnknown_Release(unk);
+
+    unk = NULL;
+    hr = IShellView_GetItemObject(view, SVGIO_BACKGROUND, &IID_IPersistHistory, (void**)&unk);
+    todo_wine ok(hr == S_OK || broken(hr == E_NOTIMPL) /* W9x, NT4 */, "got (0x%08x)\n", hr);
+    if (unk) IUnknown_Release(unk);
+
+    /* example of unsupported interface, base for IPersistHistory */
+    hr = IShellView_GetItemObject(view, SVGIO_BACKGROUND, &IID_IPersist, (void**)&unk);
+    ok(hr == E_NOINTERFACE || broken(hr == E_NOTIMPL) /* W2K */, "got (0x%08x)\n", hr);
+
+    IShellView_Release(view);
+    IShellFolder_Release(desktop);
+}
+
 START_TEST(shlview)
 {
     OleInitialize(NULL);
@@ -509,6 +550,7 @@ START_TEST(shlview)
 
     test_IShellView_CreateViewWindow();
     test_IFolderView();
+    test_GetItemObject();
 
     OleUninitialize();
 }