在MDI的Frame中，ChildFrame、View和Document是在 CMultiDocTemplate::OpenDocumentFile()里创建的：
CDocument* CMultiDocTemplate::OpenDocumentFile(LPCTSTR lpszPathName,
BOOL bMakeVisible)
{
CDocument* pDocument = CreateNewDocument();
//...
CFrameWnd* pFrame = CreateNewFrame(pDocument, NULL);
//...
if (lpszPathName == NULL)
{
// create a new document - with default document name
// ...
}
else
{
// open an existing document
//...
}
InitialUpdateFrame(pFrame, pDocument, bMakeVisible);
return pDocument;
}
其中CreateNewFrame的代码如下
CFrameWnd* CDocTemplate::CreateNewFrame(CDocument* pDoc, CFrameWnd* pOther)
{
// create a frame wired to the specified document
CCreateContext context;
context.m_pCurrentFrame = pOther;
context.m_pCurrentDoc = pDoc;
context.m_pNewViewClass = m_pViewClass;
context.m_pNewDocTemplate = this;
...
CFrameWnd* pFrame = (CFrameWnd*)m_pFrameClass->CreateObject();
...
// create new from resource
pFrame->LoadFrame(m_nIDResource,
WS_OVERLAPPEDWINDOW | FWS_ADDTOTITLE, // default frame styles
NULL, &context)
...
return pFrame;
}
从CreateNewFrame的代码来看，ChildFrame的创建没有任何指针指向主框架，那么DocTemplate是如何把ChildFrame和MainFrame联系起来的呢，也就是说，怎么子框架是怎么嵌入到主框架的呢？
