QC based on C++ development, one-form routine is very simple, suitable for beginners and design of the menu bar and toolbars, add MdiChild class that implements one of the New, Open, Save, Save As, and other functions that operate close In mainwindow.cpp files to add new functionality to test the function of the File menu.

myMdi\images\about.png
.....\......\copy.png
.....\......\cut.png
.....\......\exit.png
.....\......\new.png
.....\......\next.png
.....\......\open.png
.....\......\paste.png
.....\......\previous.png
.....\......\redo.png
.....\......\save.png
.....\......\saveAs.png
.....\......\undo.png
.....\main.cpp
.....\mainwindow.cpp
.....\mainwindow.h
.....\mainwindow.ui
.....\mdichild.cpp
.....\mdichild.h
.....\myImage.qrc
.....\myMdi.pro
.....\images
myMdi

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