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
 MDI holds 5 classes (CChildWnd<---
CMDIChildWnd,CDoc,Cview,CFrameWnd).
 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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