Using a non-modal window to generate an MDI interface

I want to generate an MDI window interface, but found that using VC is cumbersome to add a lot of runtime_class, and can not implement the main window to add feature options. That is, generate a main Outlook window, and then add multiple document windows to the main window (like the Multi-text window in office). So, write this cmdichild class. The effect is shown in figure one.

To implement this class:

First step: Generate a single document program (base class is CFormView).

Step Two: Add MDIChild.H and MDIChild.cpp two documents to the project.

Step three: Add a variable cmdichild m_child to the main window.

#include "MDIChild.H"
class CMainFrame : public CFrameWnd
{
protected: // create from serialization only
　　CMainFrame();
　　DECLARE_DYNCREATE(CMainFrame)
　　// Attributes
public:
　　CMDIChild m_Child; ///////////////////////////////
　　.....
}

Step Fourth: Add M_child.initmainwnd (this) to the OnCreate () event.

int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
　　......
　　　　RECT Rect;
　　SetRect(&Rect, 0,64,800, 574); // 非模子窗口的活动区域，没想出自动计算的好办法，
　　m_Child.InitMainWnd(this, &Rect); //所以只能手工设置。
}

Step Fifth: Add menu Events

#include "Dlg1.H"
void CMainFrame::OnDialog1()
{
　　CDlg1 *pDlg = NULL;
　　char *sName = "功能1"; ////////////////////////////////
　　if(!m_Child.GetClassChild(sName))
　　{
　　　　pDlg = new CDlg1;
　　　　if(!pDlg) return;
　　　　pDlg->Create(IDD_DIALOG1, this);
　　}
　　m_Child.ADD((CView*)pDlg, sName);
}