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C++ Beginner: Lesson 3 - Simple calculator

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After we got familiar with Qt Creator environment in the lesson 2 we will build a simple calculator in order to get familiar with some data types which come with Qt Creator framework like QString and other C++ primitive data types. First of all we need to create a new project as shown in the lesson 1 . During the creation, instead of mainwindow class we have used calculator class. After creating the project, in design view of qt creator we create the layout of our application. Initially we get a LineEdit element from the toolbox panel as shown in the figure 1. Figure 1: Add LineEdit on window After we add the line edit on window we fix the size according to our needs, in this case we fill the window horizontally by leaving some margin right and left. After we add the LineEdit element on window we need to add the buttons for the numbers and operations as well as shown in the figure 2. Figure 2: Add PushButton on window After we add the buttons as shown in the figure above we ...
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C++ Beginner: Lesson 4 - Tic Tac Toe game

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In this lesson we will cover if condition which we saw in the previous lesson as well, and we will cover the switch control statement too. Other elements that we will cover in this lesson are one and two dimensional arrays and we will see the for loop as well. During this lesson we will develop the tic tac toe game. In order to do so, we need to create a new project as we have seen in lesson 1 , but in this case we will call the application TicTacToe and the class will be named TicTacToe as well as shown in the figure 1. Figure 1: TicTacToe game The first step to create the TicTacToe application is to prepare the layout of the window. From the toolbox panel we take the Grid Layout element and drag it into window and than select the window and press the Lay Out in a Grid button as shown in the figure 2. Figure 2: Grid layout After the setup of the layout we start dragging and dropping into the window 9 QPushButton elements as shown in the figure 3 bellow. Figure 3: Add butt...
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VOIP Project: Building PJSIP library - Part 8

After downloading the PJSIP project from pjsip.org website and installing the Visual C++ IDE, PJSIP project must be opened with Visual C++ IDE. In the solution explorer where are listed all the solutions of the PJSIP project, pjsua project must be set as the starting project. Before starting to build the PJSIP project, it is necessary to check and properly set some configuration for the resulting libraries. In order to be able to build compatible libraries, it is necessary that the configuration of when building the PJSIP project, which will generate the need libraries, to be the same with the configuration of the compiler that will be used when building the final application. The first concern of course must be the compatibility of the versions of the compiler. The compilers must be both 32 or 64 bit, which means that when running the compilation of the PJSIP project the target platform must be the same as the target platform which will be used during the development of the appli...
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