what is the difference between SDI and MDI

Answer Posted / zerozero

SDI:
 We can open only one document at a time, Ex: Notepad
 SDI App hold only 4 classes (
CView,CDoc,CFrameWnd,CWinApp)
 SDI App has CSingleDocTemplate and holds 3 classes

MDI
 We can open multiple docs simultaneously, example:
MS Word
&#61692; MDI holds 5 classes (CChildWnd<---
CMDIChildWnd,CDoc,Cview,CFrameWnd).
&#61692; MDI has CMultiDocTemplate and holds below classes.

CMultiDocTemplate* pDocTemplate;
pDocTemplate = new CMultiDocTemplate(
IDR_MDIAPPTYPE,
RUNTIME_CLASS(CMDIAPPDoc),
RUNTIME_CLASS(CChildFrame), // custom MDI
child frame
RUNTIME_CLASS(CMDIAPPView));
AddDocTemplate(pDocTemplate);

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