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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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VOIP Project: Understanding VOIP - Part 4

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In order to be able to continue developing further more the VOIP system we need to know which are the components that can be used to build a VOIP system and how they are implemented. In the book titled “Packet Guide to Voice over IP” VOIP is: “…exactly what the name indicates—sending voice (and video) over an IP-based network. This is completely different than the circuit-switched public telephone network…” ( Hartpence, 2013, p. 2). The fact that VOIP “…is completely different than the circuit-switched public tele‐ phone network…” ( Hartpence, 2013, p. 2)makes it possible to do things that are not possible with the standard telephony system, like programming customized applications based on individual needs. VOIP does not only allows to transmit voice over IP but video as well, and this makes communication through VOIP even richer in features. Comparison with traditional telephony VOIP gives the opportunity to use internet connection in order to implement system, while the trad...
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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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