Creating A Menu In C++

Creating A Menu In C++. C++ Program Examples This question is once asked in “Nepal Programmers Community” Programmers Official Community I have solved the problems and provided the answers here with code I hope this will help you to understand how to solve these problems in C++ using functions Program Code for Question 1 #include #include #define B 200 #define [].

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C++ Program Examples Restaurant Menu Program & Simple

IntroductionMotivationExternal LibrariesImplementationStdEnable_Shared_From_ThisMenuitemsMenuitemWm_Menucommand WM_DRAWITEM & WM_MEASUREITEMHistoryIn this article we’re going to continue our exploration of Windows C++ development with Visual C++ 2012 We’re going to look at a set of C++ classes that allows us to implement menus programmatically with relative ease The purpose of this series is to illustrate an approach to safer and easier C++ development made possible by the C++11 standard while building our code directly on top of the Windows C and COM based APIs implementing a library that provides a simpler programming model Even if the accompanying library is a work in progress it now contains more than 450usable classes and it&#39s growing steadily The code below shows how I would like to use the classes to define a simple menu structure We should be able to create a menu item using a single statement and it should be easy to define what we want to happen when the user selects that item from the menu First we define the five objects that make up the elements of the “File” sub menu “New” “Open” “Save” and “Close” are TextMenuItem objects and we also create a SeparatorMenuItem that specifies the thin line that separates “Close” from the other items Then we use C++ lambda expressions to define the actions we want our program to take when the user selects the various menu items before we create the “File” SubMenuItemand add the menu items in the order we want them to appear on the menu The “Edit” sub menu is created using a slightly different approach where the “Edit” SubMenuItemis created first which allows us to directly add the menu items to the menu The horizontal toplevel menu is represented by a MenuBar objec The code relies on the Boost C++ libraries which can be downloaded from http//wwwboostorg[^] so you need to download and build them before updating the provided projects with include and library paths matching your installation This started out as an experiment with stdshared_ptr the smart pointer template that’s now part of the C++ standard library If you’re going to recommend a technology you should be able to build something useful based on your recommendation C++ smart pointers aren’t something new they’ve been around in various incarnations for nearly as long as C++ they’re a highly useful construct So as a practical example on the usefulness of stdshared_ptr I’m building a C++ library for user interface development and I’m now starting to get a real feel for where I’m heading This seems like a workable design somewhat based on NET while considering elements from what I think of as its predecessor Embarcaderos’ VCL and even IBMs’ User Interface Class Library The library is in its very early design phase but I still think it can be of some interest – particularly to those who wonder about the usefulness of stdshared_ptr The notion of handles is pretty prevalent so it makes sens stdenable_shared_from_this provides a mechanism that allows an object obj that is currently managed by a stdshared_ptr ptr0 to safely generate additional stdshared_ptr instances ptr1 ptr2 – all sharing ownership of obj with ptr0 Inheriting from stdenable_shared_from_this provides the type T with a member function shared_from_this When an object obj of type T is managed by a stdshared_ptr named ptr calling Tshared_from_this will return a new stdshared_ptr that shares ownership of obj with ptr Before calling shared_from_this on obj there must be an existing stdshared_ptr that owns obj So you cannot call shared_from_this inside the constructor to get a stdshared_ptrto the object under construction Note that you should use shared_from_this in place of expressions like stdshared_ptr (this) – as the latter is likely to result in thisbeing destroyed more than once by multiple owners that are unaware of each other In the case of classes derived from O The MenuItems class is a simple container for MenuItem objects that holds each MenuItem object using a stdshared_ptr Since the MenuItems object is created by the Menu constructor we cannot pass a stdshared_ptr object to the MenuItems constructor we need to pass a raw pointer to the Menuobject under construction The Menu() function returns a stdshared_ptr< Menu > which can easily be retrieved from owner using the As ()template function The Add function sets the parentMenu which is a stdweak_ptr object that now provides the MenuItem object access through the ParentMenu function to the Menuit belongs to Next we add the stdshared_ptr to the items vector which ensures that the MenuItem objects will exist for the lifetime of this MenuItems object or until they are removed Now that the housekeeping is in order we call the DoOnAdd() function of the MenuItemclass Inside the ParentMenu() function we use the lock() function to turn t Each item on a menu is represented by a MenuItemobject The DoOnAdd() function is responsible for adding the Windows menu item for the MenuItemobject to the menu it belongs to The InitializeMenuItemInfo function is responsible for initializing the MENUITEMINFO structure in particular it sets the dwItemData member of the structure to the this pointer The Windows WM_DRAWITEM and WM_MEASUREITEM notifications pass this value back to the application allowing us to determine which MenuItemobject we’re going to draw or measure The HandleMessage function for the Control class is basically a switchstatement that routes notifications to their respective handler functions Windows sends WM_MEASUREITEM and WM_DRAWITEM notifications to the window callback function when it needs to get measurement information or provide the application with the ability to perform its own rendering of owner drawn elements Since InitializeMenuItemInfo provided Windows with a pointer to the MenuItem we can now access that pointer using the itemData member of the MEASUREITEMSTRUCT or DRAWITEMSTRUCT and call the DoOnMeasureItem or DoOnDrawItem on the MenuItemobject as required We use CtlType to determine that the notification is for a menu set handled to true to prevent the notification from being passed to the DefWindowProc and set result to true which lets Windows know that we have handled the message The WM_MENUCOMMAND the notification Windows sends when the user selects an item on the menu does not provide the pointer to 6thOctober 2012 Initial posting20thOctober 2012 Bug fixes and a wide range of changes to the library21st October 2012 Added a few new classes23rd October 2012 Added a few new classes 5/5 (53).

Simple MENU Program In C++ DevEnum.com

===== MENU ===== 1Add student records 2Delete student records 3Update student records 4View all student records 5Find a student by ID Enter your choice(15)1 you have selected add student Press y or Y to continue^A.