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Business Logic / Control
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Types of Control Functions
An overview of the types of functions distinguished within Control.
Mapping Functions
Mapping Methods
The Mapping object provides following methods.
"value" (mapping::value)
Returns the value at given key or the defaultValue if the key is not found.

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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.
  - 32/64 bit Functions
  - Administration of Managers, Modules and Panels - Functions
  - Alert Handling Functions
    These functions are associated with data points and respond to alerts and changes to alerts.
  - Blob Functions
  - Communication Functions
  - Connection Functions
    Connection functions can be used to establish connections to alerts, data points and system events.
  - Crypthographic Functions
  - Database Functions
  - Data point Functions
  - Error Functions
  - File Functions
  - Graphics Functions
  - Help Viewer Functions
    Available Functions for the Help Viewer.
  - Input Recording Functions
  - Mapping Functions
    - Mapping Methods
      The Mapping object provides following methods.
      - "clear" (mapping::clear)
        Empties the mapping.
      - "contains"(mapping::contains)
        Returns true if the key is already in the mapping.
      - "count" (mapping::count)
        Returns the number of keys.
      - "insert" (mapping::insert)
        Insert a key/value pair.
      - "isEmpty" (mapping::isEmpty)
        Returns true if the mapping is empty.
      - "keys" (mapping::keys)
        Returns a list containing all the keys in a mapping in an arbitrary order.
      - "keyAt" (mapping::keyAt)
        Returns the key at the given index position.
      - "merged" (mapping::merged)
        This function creates a new instance by merging two mappings.
      - "remove" (mapping::remove)
        Removes the key and the associated value.
      - "value" (mapping::value)
        Returns the value at given key or the defaultValue if the key is not found.
      - "values"(mapping::values)
        Returns a list containing all values in a mapping, in an arbitrary order. The order is the same as that used by keys().
      - "valueAt" (mapping::valueAt)
        Returns the value at the given index position.
    - Mapping Functions
      The following functions are used for the handling of mappings.
  - Mathematical Functions
  - MindSphere Connector Functions
  - Miscellaneous Functions
  - Multilingual Functionality
  - Project administration Functions
  - Query Functions
  - Redu/Dist Functions
  - Reference - Focus Policy - Functions
  - Selection and Configuration Dialogs - Functions
  - Semaphore Functions
  - String Functions
  - Time Functions
  - Threads Functions
  - User Administration Functions
  - Vector / Dynamic arrays - Functions
  - Waiting Control Functions
  - Window Functions
    This chapter lists all functions used to control windows and panels, such as ChildPanelOn, LayerOn, LayerOff, PanelOff, RootPanelOn, SwitchLayer, ZoomModule, and related dialog and module operations.
  - Window Functions
    This chapter lists all functions used to control windows and panels, such as ChildPanelOn, LayerOn, LayerOff, PanelOff, RootPanelOn, SwitchLayer, ZoomModule, and related dialog and module operations.
  - XML Control Extension Functions
- 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.
- WinCC OA JavaScript Manager for Node.js
  The WinCC OA JavaScript Manager for Node.js is a manager that allows for the integration of the TypeScript/JavaScript runtime environment Node.js® into WinCC OA.
- API Manager
  The WinCC OA API (Application Programming Interface) offers a number of functions adding special Managers to this process control system.
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The process connection to the actual machines/sensors.
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Basic information about terms and functions within the documentation.
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A brief clarification of liability exclusions or legal notices.

"value" (mapping::value)

Returns the value at given key or the defaultValue if the key is not found.

Synopsis

T mapping.value(T key, T defaultValue = anytype());

Parameters


Parameter	Description
key	Mapping key
defaultValue	Value that is returned if key does not exist.

Description

Assignment

Mapping