osg help

#ifdef _WIN32
#include <Windows.h>
#endif // _WIN32

#include <osgViewer/Viewer>
#include <osgDB/ReadFile>
#include <osgGA/GUIEventAdapter>
#include <osgViewer/ViewerEventHandlers>

int main()
{
　　osg::ref_ptr<osgViewer::Viewer> viewer = new osgViewer::Viewer;
　　osg::ref_ptr<osg::Node> node = new osg::Node;

　　node = osgDB::readNodeFile("D:\\参考手册\\BIM\\osg\\library.OSGB");
　　viewer->setSceneData(node.get());
　　viewer->setUpViewInWindow(200,200,700,500,0);
　　
　　//添加帮助事件
　　viewer->addEventHandler(new osgViewer::HelpHandler);

　　return viewer->run();
}