user32/listbox: Make LBS_NODATA listboxes error on any attempt to find a value.

dlls/user32/listbox.c

@@ -917,6 +917,12 @@ static INT LISTBOX_FindString( LB_DESCR *descr, INT start, LPCWSTR str, BOOL exa
     INT i;
     LB_ITEMDATA *item;
 
+    if (descr->style & LBS_NODATA)
+    {
+        SetLastError(ERROR_INVALID_PARAMETER);
+        return LB_ERR;
+    }
+
     if (start >= descr->nb_items) start = -1;
     item = descr->items + start + 1;
     if (HAS_STRINGS(descr))
@@ -2455,7 +2461,7 @@ static LRESULT LISTBOX_HandleChar( LB_DESCR *descr, WCHAR charW )
                                 (LPARAM)descr->self );
         if (caret == -2) return 0;
     }
-    if (caret == -1)
+    if (caret == -1 && !(descr->style & LBS_NODATA))
         caret = LISTBOX_FindString( descr, descr->focus_item, str, FALSE);
     if (caret != -1)
     {

dlls/user32/tests/listbox.c

@@ -2103,12 +2103,30 @@ static void test_LBS_NODATA(void)
     }
 
     /* More messages that don't work with LBS_NODATA. */
+    SetLastError(0xdeadbeef);
+    ret = SendMessageA(listbox, LB_FINDSTRING, 1, 0);
+    ok(ret == LB_ERR, "Unexpected return value %d.\n", ret);
+    ok(GetLastError() == ERROR_INVALID_PARAMETER, "GetLastError should return 0x57, got 0x%X\n", GetLastError());
+    SetLastError(0xdeadbeef);
     ret = SendMessageA(listbox, LB_FINDSTRING, 1, 42);
     ok(ret == LB_ERR, "Unexpected return value %d.\n", ret);
+    ok(GetLastError() == ERROR_INVALID_PARAMETER, "GetLastError should return 0x57, got 0x%X\n", GetLastError());
+    SetLastError(0xdeadbeef);
+    ret = SendMessageA(listbox, LB_FINDSTRINGEXACT, 1, 0);
+    ok(ret == LB_ERR, "Unexpected return value %d.\n", ret);
+    ok(GetLastError() == ERROR_INVALID_PARAMETER, "GetLastError should return 0x57, got 0x%X\n", GetLastError());
+    SetLastError(0xdeadbeef);
     ret = SendMessageA(listbox, LB_FINDSTRINGEXACT, 1, 42);
     ok(ret == LB_ERR, "Unexpected return value %d.\n", ret);
+    ok(GetLastError() == ERROR_INVALID_PARAMETER, "GetLastError should return 0x57, got 0x%X\n", GetLastError());
+    SetLastError(0xdeadbeef);
+    ret = SendMessageA(listbox, LB_SELECTSTRING, 1, 0);
+    ok(ret == LB_ERR, "Unexpected return value %d.\n", ret);
+    ok(GetLastError() == ERROR_INVALID_PARAMETER, "GetLastError should return 0x57, got 0x%X\n", GetLastError());
+    SetLastError(0xdeadbeef);
     ret = SendMessageA(listbox, LB_SELECTSTRING, 1, 42);
     ok(ret == LB_ERR, "Unexpected return value %d.\n", ret);
+    ok(GetLastError() == ERROR_INVALID_PARAMETER, "GetLastError should return 0x57, got 0x%X\n", GetLastError());
 
     DestroyWindow(listbox);