pstorec: Fix QueryInterface() of IPStore.

configure

@@ -18249,6 +18249,7 @@ wine_fn_config_test dlls/propsys/tests propsys_test
 wine_fn_config_dll psapi enable_psapi implib
 wine_fn_config_test dlls/psapi/tests psapi_test
 wine_fn_config_dll pstorec enable_pstorec clean
+wine_fn_config_test dlls/pstorec/tests pstorec_test
 wine_fn_config_dll qcap enable_qcap
 wine_fn_config_test dlls/qcap/tests qcap_test
 wine_fn_config_dll qedit enable_qedit clean

configure.ac

@@ -3306,6 +3306,7 @@ WINE_CONFIG_TEST(dlls/propsys/tests)
 WINE_CONFIG_DLL(psapi,,[implib])
 WINE_CONFIG_TEST(dlls/psapi/tests)
 WINE_CONFIG_DLL(pstorec,,[clean])
+WINE_CONFIG_TEST(dlls/pstorec/tests)
 WINE_CONFIG_DLL(qcap)
 WINE_CONFIG_TEST(dlls/qcap/tests)
 WINE_CONFIG_DLL(qedit,,[clean])

dlls/pstorec/pstorec.c

@@ -24,6 +24,7 @@
 #include "windef.h"
 #include "winbase.h"
 #include "winuser.h"
+#include "initguid.h"
 #include "ole2.h"
 #include "pstore.h"
 
@@ -67,13 +68,13 @@ static HRESULT WINAPI PStore_fnQueryInterface(
 {
     PStore_impl *This = impl_from_IPStore(iface);
 
-    TRACE("%p %s\n",This,debugstr_guid(riid));
+    TRACE("%p %s %p\n", This, debugstr_guid(riid), ppvObj);
 
     *ppvObj = NULL;
 
-    if (IsEqualIID(riid, &IID_IUnknown))
+    if (IsEqualIID(riid, &IID_IPStore) || IsEqualIID(riid, &IID_IUnknown))
     {
-        *ppvObj = This;
+        *ppvObj = &This->IPStore_iface;
     }
 
     if (*ppvObj)

dlls/pstorec/tests/Makefile.in

+TESTDLL = pstorec.dll
+
+C_SRCS = \
+	pstorec.c

dlls/pstorec/tests/pstorec.c

+/*
+ * Protected Storage Tests
+ *
+ * Copyright 2017 Nikolay Sivov
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+#include <stdarg.h>
+
+#define COBJMACROS
+#include "windef.h"
+#include "initguid.h"
+#include "ole2.h"
+#include "pstore.h"
+
+#include "wine/test.h"
+
+static HRESULT (WINAPI *pPStoreCreateInstance)(IPStore **store, PST_PROVIDERID *id, void *reserved, DWORD flags);
+
+static void test_PStoreCreateInstance(void)
+{
+    IPStore *store;
+    IUnknown *unk;
+    HRESULT hr;
+
+    if (!pPStoreCreateInstance)
+    {
+        win_skip("PStoreCreateInstance is not available\n");
+        return;
+    }
+
+    hr = pPStoreCreateInstance(&store, NULL, NULL, 0);
+    if (hr == E_NOTIMPL)
+    {
+        /* this function does not work starting with Win8 */
+        win_skip("PStoreCreateInstance is not implemented on this system\n");
+        return;
+    }
+    ok(hr == S_OK, "Unexpected return value %#x.\n", hr);
+
+    hr = IPStore_QueryInterface(store, &IID_IUnknown, (void **)&unk);
+    ok(hr == S_OK, "Unexpected return value %#x.\n", hr);
+    IUnknown_Release(unk);
+
+    hr = IPStore_QueryInterface(store, &IID_IPStore, (void **)&unk);
+    ok(hr == S_OK, "Unexpected return value %#x.\n", hr);
+    IUnknown_Release(unk);
+
+    IPStore_Release(store);
+}
+
+START_TEST(pstorec)
+{
+    HMODULE module = LoadLibraryA("pstorec");
+
+    pPStoreCreateInstance = (void *)GetProcAddress(module, "PStoreCreateInstance");
+
+    test_PStoreCreateInstance();
+}