C++ Libraries in WinCC

First of all, Happy and Prosperous New Year 2017... This will be the first practice of this year, although it was pending like others from last year, little by little I will continue updating.

Since we were creating Libraries and Controls, we will continue down that path, and on this occasion we are going to create a Dynamic Library in C++ to use in WinCC, of course. I used Visual Studio 2010 for the development of this practice.

We are going to create a new Visual C++ project of the type Win32 Project, then we assign the name we want and continue with the wizard.

In the wizard, we click next to access the next screen.

Here is where we are going to select the type of application we are going to develop.

In our case, it is a Dynamic Link Library.

With this, we finish the wizard.

At this point, we open the file SystemTime.cpp where we are going to implement our code.

For this example, we will see how to access the date, but we will break it down into several functions, such as hour, minute, second, etc...

We will not go into details of the C++ code, simply that for us to access this in WinCC we have to follow certain guidelines, but in the next image, the concept to follow is clearly seen.

Once we have implemented our code, we can compile and generate the library that we are going to implement, as we can see here we have our library.

The next step is to use it in WinCC, in this case as it is developed in C++ we will use it in ANSI C code, and to be able to use it we have to declare it as shown in the next image. We will use it in a button.

I have previously copied the SystemTime.dll library into the Controls directory.

We use the code #pragma code(Path of our Library)

We declare the functions that we are going to use.

We close #pragma code.

And we can now use in our code the functions we have previously declared.

Finally, we compile and test it in Runtime to see its operation...

As can be seen, it works correctly.

January 14, 2017