在MFC中获取现有但非活动的视图 [英] getting an existing but non-active view in MFC

问题描述

说我想访问MFC MDI应用程序中的doc类中的特定视图(如果已打开).该视图可以当前处于活动状态，也可以不处于活动状态.如果我可以假定视图始终处于活动状态，则可以按照以下说明进行操作

Say I want to access a specific view in a doc class in MFC MDI application if it is already opened. The view can be currently active or not. If I can assume the view is always active, I can follow this instruction

http://support.microsoft.com/kb/108587

，但视图也可以处于非活动状态.有什么办法吗?

but the view can be also non-active. Is there any way to do this?

推荐答案

执行此操作的方法较短，但这是简单的方法.假定以下代码是CMainFrame类中的菜单处理程序:

There shorter ways to do this, but here's the straight up way. Assume the following code is a menu handler in your CMainFrame class:

  for( POSITION pos = AfxGetApp()->GetFirstDocTemplatePosition(); pos != NULL; )
  {
    CDocTemplate* pTempl = AfxGetApp()->GetNextDocTemplate( pos );

    for( POSITION pos1 = pTempl->GetFirstDocPosition(); pos1!= NULL; )
    {
      CDocument* pDoc = pTempl->GetNextDoc( pos1 );

      for( POSITION pos2 = pDoc->GetFirstViewPosition(); pos2 != NULL; )
      {
        CView* pView = pDoc->GetNextView( pos2 );
        if( pView->IsKindOf( RUNTIME_CLASS(...) ) )
        {
          // Do what you need with the view...
        }
      }
    }
  }

基本上，您必须获得一个指向模板的指针，查看与之关联的CDocument，对于每个CDocument，遍历该文档所附的所有视图.

You basically have to get a pointer to the Template, look at the CDocuments associated with it, and for each CDocument, traverse through all the views attached to the document.

如果仅使用一个模板，一个文档和附加的多个视图，则可以将该模板保存在CMainFrame类中，并可以通过调用AfxGetApp()-> m_pTemplate来更快地获取它.

If you only use one template, one document, and multiple views attached, you can save the template in CMainFrame class and get to it faster by calling AfxGetApp()->m_pTemplate.

MFC在某些方面很时髦，但是如果需要，它可以使您进入Doc/View体系结构的任何部分.

MFC is funky in some ways, but it lets you get to any part of the Doc/View architecture if you needed.

希望这会为您指明正确的方向.

Hope this points you in the right direction.

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