mmdevapi: Add an empty IMMDeviceCollection implementation.

dlls/mmdevapi/devenum.c

@@ -42,6 +42,101 @@ typedef struct MMDevEnumImpl
 static MMDevEnumImpl *MMDevEnumerator;
 static const IMMDeviceEnumeratorVtbl MMDevEnumVtbl;
 
+typedef struct MMDevColImpl
+{
+    const IMMDeviceCollectionVtbl *lpVtbl;
+    LONG ref;
+    MMDevEnumImpl *parent;
+    EDataFlow flow;
+    DWORD state;
+} MMDevColImpl;
+static const IMMDeviceCollectionVtbl MMDevColVtbl;
+
+static HRESULT MMDevCol_Create(IMMDeviceCollection **ppv, MMDevEnumImpl *parent, EDataFlow flow, DWORD state)
+{
+    MMDevColImpl *This;
+    This = HeapAlloc(GetProcessHeap(), 0, sizeof(*This));
+    *ppv = NULL;
+    if (!This)
+        return E_OUTOFMEMORY;
+    This->lpVtbl = &MMDevColVtbl;
+    This->ref = 1;
+    This->parent = parent;
+    This->flow = flow;
+    This->state = state;
+    *ppv = (IMMDeviceCollection*)This;
+    return S_OK;
+}
+
+static void MMDevCol_Destroy(MMDevColImpl *This)
+{
+    HeapFree(GetProcessHeap(), 0, This);
+}
+
+static HRESULT WINAPI MMDevCol_QueryInterface(IMMDeviceCollection *iface, REFIID riid, void **ppv)
+{
+    MMDevColImpl *This = (MMDevColImpl*)iface;
+
+    if (!ppv)
+        return E_POINTER;
+    if (IsEqualIID(riid, &IID_IUnknown)
+        || IsEqualIID(riid, &IID_IMMDeviceCollection))
+        *ppv = This;
+    else
+        *ppv = NULL;
+    if (!*ppv)
+        return E_NOINTERFACE;
+    IUnknown_AddRef((IUnknown*)*ppv);
+    return S_OK;
+}
+
+static ULONG WINAPI MMDevCol_AddRef(IMMDeviceCollection *iface)
+{
+    MMDevColImpl *This = (MMDevColImpl*)iface;
+    LONG ref = InterlockedIncrement(&This->ref);
+    TRACE("Refcount now %i\n", ref);
+    return ref;
+}
+
+static ULONG WINAPI MMDevCol_Release(IMMDeviceCollection *iface)
+{
+    MMDevColImpl *This = (MMDevColImpl*)iface;
+    LONG ref = InterlockedDecrement(&This->ref);
+    TRACE("Refcount now %i\n", ref);
+    if (!ref)
+        MMDevCol_Destroy(This);
+    return ref;
+}
+
+static HRESULT WINAPI MMDevCol_GetCount(IMMDeviceCollection *iface, UINT *numdevs)
+{
+    MMDevColImpl *This = (MMDevColImpl*)iface;
+    TRACE("(%p)->(%p)\n", This, numdevs);
+    if (!numdevs)
+        return E_POINTER;
+    *numdevs = 0;
+    return S_OK;
+}
+
+static HRESULT WINAPI MMDevCol_Item(IMMDeviceCollection *iface, UINT i, IMMDevice **dev)
+{
+    MMDevColImpl *This = (MMDevColImpl*)iface;
+    TRACE("(%p)->(%u, %p)\n", This, i, dev);
+    if (!dev)
+        return E_POINTER;
+    *dev = NULL;
+    return E_INVALIDARG;
+}
+
+static const IMMDeviceCollectionVtbl MMDevColVtbl =
+{
+    MMDevCol_QueryInterface,
+    MMDevCol_AddRef,
+    MMDevCol_Release,
+    MMDevCol_GetCount,
+    MMDevCol_Item
+};
+
 HRESULT MMDevEnum_Create(REFIID riid, void **ppv)
 {
     MMDevEnumImpl *This = MMDevEnumerator;
@@ -111,8 +206,7 @@ static HRESULT WINAPI MMDevEnum_EnumAudioEndpoints(IMMDeviceEnumerator *iface, E
         return E_INVALIDARG;
     if (mask & ~DEVICE_STATEMASK_ALL)
         return E_INVALIDARG;
-    FIXME("stub\n");
-    return E_NOTFOUND;
+    return MMDevCol_Create(devices, This, flow, mask);
 }
 
 static HRESULT WINAPI MMDevEnum_GetDefaultAudioEndpoint(IMMDeviceEnumerator *iface, EDataFlow flow, ERole role, IMMDevice **device)

dlls/mmdevapi/tests/mmdevenum.c

@@ -45,6 +45,9 @@ static void test_collection(IMMDeviceEnumerator *mme, IMMDeviceCollection *col)
     IUnknown_Release(col);
     ok(ref == 2, "Invalid reference count %u on collection\n", ref);
 
+    hr = IUnknown_QueryInterface(col, &IID_IUnknown, NULL);
+    ok(hr == E_POINTER, "Null ppv returns %08x\n", hr);
+
     hr = IUnknown_QueryInterface(col, &IID_IUnknown, (void**)&unk);
     ok(hr == S_OK, "Cannot query for IID_IUnknown: 0x%08x\n", hr);
     if (hr == S_OK)
@@ -137,7 +140,7 @@ START_TEST(mmdevenum)
     ok(hr == E_POINTER, "Invalid pointer returned: 0x%08x\n", hr);
 
     hr = IMMDeviceEnumerator_EnumAudioEndpoints(mme, eAll, DEVICE_STATEMASK_ALL, &col);
-    todo_wine ok(hr == S_OK, "Valid EnumAudioEndpoints returned 0x%08x\n", hr);
+    ok(hr == S_OK, "Valid EnumAudioEndpoints returned 0x%08x\n", hr);
     if (hr == S_OK)
     {
         ok(!!col, "Returned null pointer\n");