user32: Use SendNotifyMessage to send WM_DRAWCLIPBOARD.

dlls/user32/clipboard.c

@@ -287,7 +287,7 @@ BOOL WINAPI CloseClipboard(void)
             bCBHasChanged = FALSE;
 
             if (hWndViewer)
-                SendMessageW(hWndViewer, WM_DRAWCLIPBOARD, (WPARAM) GetClipboardOwner(), 0);
+                SendNotifyMessageW(hWndViewer, WM_DRAWCLIPBOARD, (WPARAM) GetClipboardOwner(), 0);
         }
 
         bRet = TRUE;
@@ -393,7 +393,7 @@ HWND WINAPI SetClipboardViewer( HWND hWnd )
     HWND hwndPrev = CLIPBOARD_SetClipboardViewer(hWnd);
 
     if (hWnd)
-        SendMessageW(hWnd, WM_DRAWCLIPBOARD, (WPARAM) GetClipboardOwner(), 0);
+        SendNotifyMessageW(hWnd, WM_DRAWCLIPBOARD, (WPARAM) GetClipboardOwner(), 0);
     TRACE("(%p): returning %p\n", hWnd, hwndPrev);
 
     return hwndPrev;

dlls/user32/tests/clipboard.c

@@ -269,6 +269,83 @@ static void test_synthesized(void)
     ok(r, "gle %d\n", GetLastError());
 }
 
+static CRITICAL_SECTION clipboard_cs;
+static LRESULT CALLBACK clipboard_wnd_proc(HWND hwnd, UINT msg, WPARAM wp, LPARAM lp)
+{
+    switch(msg) {
+    case WM_DRAWCLIPBOARD:
+        EnterCriticalSection(&clipboard_cs);
+        LeaveCriticalSection(&clipboard_cs);
+        break;
+    case WM_USER:
+        PostQuitMessage(0);
+        break;
+    }
+
+    return DefWindowProc(hwnd, msg, wp, lp);
+}
+
+static DWORD WINAPI clipboard_thread(void *param)
+{
+    HWND win = param;
+    BOOL r;
+
+    EnterCriticalSection(&clipboard_cs);
+    SetLastError(0xdeadbeef);
+    SetClipboardViewer(win);
+    ok(GetLastError() == 0xdeadbeef, "GetLastError = %d\n", GetLastError());
+    LeaveCriticalSection(&clipboard_cs);
+
+    r = OpenClipboard(win);
+    ok(r, "OpenClipboard failed: %d\n", GetLastError());
+
+    r = EmptyClipboard();
+    ok(r, "EmptyClipboard failed: %d\n", GetLastError());
+
+    EnterCriticalSection(&clipboard_cs);
+    r = CloseClipboard();
+    ok(r, "CloseClipboard failed: %d\n", GetLastError());
+    LeaveCriticalSection(&clipboard_cs);
+
+    r = PostMessage(win, WM_USER, 0, 0);
+    ok(r, "PostMessage failed: %d\n", GetLastError());
+    return 0;
+}
+
+static void test_messages(void)
+{
+    WNDCLASS cls;
+    HWND win;
+    MSG msg;
+    HANDLE thread;
+    DWORD tid;
+
+    InitializeCriticalSection(&clipboard_cs);
+
+    memset(&cls, 0, sizeof(cls));
+    cls.lpfnWndProc = clipboard_wnd_proc;
+    cls.hInstance = GetModuleHandle(0);
+    cls.lpszClassName = "clipboard_test";
+    RegisterClass(&cls);
+
+    win = CreateWindow("clipboard_test", NULL, 0, 0, 0, 0, 0, NULL, 0, NULL, 0);
+    ok(win != NULL, "CreateWindow failed: %d\n", GetLastError());
+
+    thread = CreateThread(NULL, 0, clipboard_thread, (void*)win, 0, &tid);
+    ok(thread != NULL, "CreateThread failed: %d\n", GetLastError());
+
+    while(GetMessage(&msg, NULL, 0, 0)) {
+        TranslateMessage(&msg);
+        DispatchMessage(&msg);
+    }
+
+    ok(WaitForSingleObject(thread, INFINITE) == WAIT_OBJECT_0, "WaitForSingleObject failed\n");
+    CloseHandle(thread);
+
+    UnregisterClass("clipboard_test", GetModuleHandle(0));
+    DeleteCriticalSection(&clipboard_cs);
+}
+
 START_TEST(clipboard)
 {
     SetLastError(0xdeadbeef);
@@ -278,4 +355,5 @@ START_TEST(clipboard)
     test_RegisterClipboardFormatA();
     test_ClipboardOwner();
     test_synthesized();
+    test_messages();
 }