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NextGen Archiver Backend-API
This chapter describes the NextGen Archiver Backend API
Requirements
Contains the requirements for the NGA Backend API.

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Business Logic / Control
Endless possibilities in data processing for your projects.
- Introduction to CTRL
  An introduction to the product's own programming language Control(CTRL).
- Control Classes
  The overview of classes available in Control.
- Types of Control Functions
  An overview of the types of functions distinguished within Control.
- Control graphics
- CONTROL Functions
- CtrlExtension
  The CtrlExtension allows the addition of custom C++ code.
- CTRL Debugger
  You can use the CTRL debugger to debug the Control programming language. The debugger can be used via its own panel, which also enables the monitoring and setting of variable values during the execution of a script.
- SQL in CONTROL
  The database functions enable you to quickly carry out value queries on data points and elements.
- API Manager
  The WinCC OA API (Application Programming Interface) offers a number of functions adding special Managers to this process control system.
- NextGen Archiver Backend-API
  This chapter describes the NextGen Archiver Backend API
  - Architecture
    This chapter provides an overview of the NGA system architecture.
  - Backend
    Description of what is a backend.
  - Segment Management
    The segments are used for NGA archiving. In order to keep the data manageable, NGA structures the data of each archive group into segments.
  - Requirements
    Contains the requirements for the NGA Backend API.
  - Project structure
    This chapter describes the project structure of the TemplateNextGenArchBackend project (lib, exe and plugin projects as well as the dplist directory).
  - Build steps
    Build steps contains the steps Create new project and Updating third-party libraries in an existing project.
  - Work modes
    The backend can work in various modes.
  - Backend API architecture
    This chapter describes what classes you must implement to implement your backend.
  - Redundancy
    Describes the NGA redundancy.
  - Backend lifetime
    This chapter describes the backend lifetime consisting of the different steps for starting and stopping such as Create a CommonBackend instance and Get DatabaseParameters.
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Requirements

Contains the requirements for the NGA Backend API.

In order to build the custom backend, you need the following software and libraries:

CMake (The minimum version is indicated in the CMakeDefines.txt file in the <wincc_oa_path>/api directory.)
MSVC/GCC - You can find the required versions for these components in the WinCC OA Documentation under API development.
- Windows: cl compiler and cmake in the path environment variable
- Linux: cmake in the path environment variable
curl utility
OpenSSL - You can find the required version in the WinCC OA Documentation under OpenSSL.
- For Windows, the version of the library from the ExternalLibs\openssl folder will be used.
- For Linux, you need to install the library of the specified version independently.