fix a crash of API::root

2015-10-14 22:20:51 +08:00
parent b160e5e833
commit cb4bb7d60e
2 changed files with 4 additions and 2 deletions
--- a/source/gui/programming_interface.cpp
+++ b/source/gui/programming_interface.cpp
@@ -442,7 +442,9 @@ namespace API
 	native_window_type root(window wd)
 	{
 		internal_scope_guard lock;
-		return reinterpret_cast<basic_window*>(wd)->root;
+		if(is_window(wd))
+			return reinterpret_cast<basic_window*>(wd)->root;
+		return nullptr;
 	}

 	window root(native_window_type wd)