移植《OSG三维渲染引擎编程指南》中PickHandler例子时出错

edisonsuper

RT，在往MFC框架的OSG程序中移植《OSG三维渲染引擎编程指南》280页中的PickHandler例子时，在eventTraversal()时的：
for(EventHandlers::iterator hitr = _eventHandlers.begin();
     hitr!=_eventHandlers.end();
     ++hitr)
{
    (*hitr)->handleWithCheckAgainstIgnoreHandledEventsMask(*event, *this,0,0);
}
红色部分出现了断言失败，提示：
_DEBUG_ERROR("list iterator not incrementable")

感觉是在用：
mViewer->addEventHandler(new CPickHandler(updatetext.get()))
添加事件响应时未成功导致的，不知道这样描述各位高人能不能看出问题出在哪里？还望指教！

array

至少我个人看不出什么端倪~~不知道您是不是试图动态删除或添加什么对象

edisonsuper

2# array
并没有删除操作，这个例子在控制台中运行正常，只是想把它移植到ViewerMFC的那个例子里面时运行出错

原控制台主函数如下：

1. osg::ref_ptr<osgViewer::Viewer>viewer = new osgViewer::Viewer();
   
2. osg::ref_ptr<osg::Group>root = new osg::Group();
   
3. 
   
4. osg::ref_ptr<osg::Node>node = osgDB::readNodeFile("D:/vpb/M.osga");
   
5. 
   
6. osg::ref_ptr<osgText::Text>updatetext = new osgText::Text();
   
7. CreateHUD * hudText = new CreateHUD();
   
8. root->addChild(node.get());
   
9. root->addChild(hudText->createHUD(updatetext.get()));
   
10. 
    
11. viewer->addEventHandler(new CPickHandler(updatetext.get()));
    
12. osgUtil::Optimizer optimizer;
    
13. optimizer.optimize(root.get());
    
14. viewer->setSceneData(root.get());
    
15. viewer->realize();
    
16. viewer->run();

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ViewerMFC中的调用如下：

1. 
   
2. InitSceneGraph();
   
3. InitCameraConfig();
   

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其中：

1. 
   
2. void CiMaster::InitSceneGraph(void)
   
3. {
   
4. // Init the main Root Node/Group
   
5. mRoot  = new osg::Group;
   
6. // Load the Model from the model name
   
7. setlocale(LC_ALL , "chs");
   
8. mModel = osgDB::readNodeFile(m_ModelName);
   
9. 
   
10. 
    
11. // Optimize the model
    
12. osgUtil::Optimizer optimizer;
    
13. optimizer.optimize(mModel.get());
    
14. optimizer.reset();
    
15. // Add the model to the scene
    
16. mRoot->addChild(mModel.get());
    
17. }
    
18. 
    
19. void CiMaster::InitCameraConfig(void)
    
20. {
    
21. // Local Variable to hold window size data
    
22. RECT rect;
    
23. // Create the viewer for this window
    
24. mViewer = new osgViewer::Viewer();
    
25. // Add a Stats Handler to the viewer
    
26. mViewer->addEventHandler(new osgViewer::StatsHandler);
    
27. 
    
28. /////////////////////////////////////////////////////////////////////////////
    
29. //修改部分
    
30. //pickhandler
    
31. osg::ref_ptr<osgText::Text>updatetext = new osgText::Text();
    
32. CreateHUD * hudText = new CreateHUD();
    
33. mRoot->addChild(hudText->createHUD(updatetext.get()));
    
34. CPickHandler* pickhandler = new CPickHandler(updatetext.get());
    
35. pickhandler->setDataVariance(osg::Object:ataVariance:YNAMIC);
    
36. mViewer->addEventHandler(pickhandler);
    
37. //mViewer->addEventHandler(new CPickHandler(updatetext.get()));
    
38. mViewer->addEventHandler(new osgViewer::HelpHandler);
    
39. /////////////////////////////////////////////////////////////////////////////
    
40. 
    
41. // Get the current window size
    
42. ::GetWindowRect(m_hWnd, &rect);
    
43. // Init the GraphicsContext Traits
    
44. osg::ref_ptr<osg::GraphicsContext::Traits> traits = new osg::GraphicsContext::Traits;
    
45. // Init the Windata Variable that holds the handle for the Window to display OSG in.
    
46. osg::ref_ptr<osg::Referenced> windata = new osgViewer::GraphicsWindowWin32::WindowData(m_hWnd);
    
47. // Setup the traits parameters
    
48. traits->x = 0;
    
49. traits->y = 0;
    
50. traits->width = rect.right - rect.left;
    
51. traits->height = rect.bottom - rect.top;
    
52. traits->windowDecoration = false;
    
53. traits->doubleBuffer = true;
    
54. traits->sharedContext = 0;
    
55. traits->setInheritedWindowPixelFormat = true;
    
56. traits->inheritedWindowData = windata;
    
57. // Create the Graphics Context
    
58. osg::GraphicsContext* gc = osg::GraphicsContext::createGraphicsContext(traits.get());
    
59. // Init a new Camera (Master for this View)
    
60. osg::ref_ptr<osg::Camera> camera = new osg::Camera;
    
61. // Assign Graphics Context to the Camera
    
62. camera->setGraphicsContext(gc);
    
63. // Set the viewport for the Camera
    
64. camera->setViewport(new osg::Viewport(traits->x, traits->y, traits->width, traits->height));
    
65. // Add the Camera to the Viewer
    
66. mViewer->addSlave(camera.get());
    
67. // Add the Camera Manipulator to the Viewer
    
68. mViewer->setCameraManipulator(keyswitchManipulator.get());
    
69. // Set the Scene Data
    
70. mViewer->setSceneData(mRoot.get());
    
71. // Realize the Viewer
    
72. mViewer->realize();
    
73. // Correct aspect ratio
    
74. double fovy,aspectRatio,z1,z2;
    
75. mViewer->getCamera()->getProjectionMatrixAsPerspective(fovy,aspectRatio,z1,z2);
    
76. aspectRatio=double(traits->width)/double(traits->height);
    
77. mViewer->getCamera()->setProjectionMatrixAsPerspective(fovy,aspectRatio,z1,z2);
    
78. 
    
79. }
    

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是这样的调用方式有问题吗，多谢指导！

array

我不知道CPickHandler的具体内容是什么，不过您可以注意一下updatetext是否是被动态改变的：如果是的话，它也要设置为DYNAMIC。此外，一个好的调试方法是暂时屏蔽addEventHandler(CPickHandler)一行，如果程序可以运行的话，那么可能是这个类的代码本身存在问题

godsay1983

我移植这个例子的时候也出现相同的问题了，不知道你们当时是怎么解决的。