dOPC Client Toolkit
What's new in Version 5

New main features of the dOPC version 5.0

  • dOPC is now compatible with OPC UA (Unified Architecture). Which means you can now easily build OPC UA client programs for Windows, Android, iOS and MacOS.
  • The new version works only with Delphi and C++ Builder XE version 10 (Seattle) or higher.
  • This version currently does not support Free Pascal (


General changes:

  • We have renamed the class TdOPCServer to TdOPCDACient
  • We have renamed the class TdOPCSvr to TdOPCCient
  • We have changed the property Value of class TdOPCItem from OleVariant to Variant
  • We have deleted event OnWriteError, you can now use event OnWriteComplete instead.


Other minor changes:

  • We have changed the type of the "TServerStateRec" member "BuildNumber" from integer to string
  • The function ServerStateToStr has now a new Parameter.
  • For C++ developers: we have renamed several classes and records from e.g. tServerStateRecord to TServerStateRecord.
  • fixed several internal small bugs.


If you want to upgrade a program developed with a previous of dOPC please: click here 

For further information about dOPC and UA please: click here 

You will find a change history of version 5.x in file changelog.txt of the dOPC installation.

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