OPC Programming with C++Builder

A number of Delphi OPC solutions also support C++Builder. Visit our Delphi page for more information on dOPC and Prosys Sentrol.

The code samples on this page have been generously provided by Rusman Rusyadi. Thanks Rusman! Most were developed with C++Builder 4, and may not work with later versions.

The first sample, Using the OPC Custom Interfaces Directly, is also available in a version for C++Builder 6.

Building an OPC Client

• Using the OPC Custom Interfaces Directly
• Using ActiveX Control from Softing
• Using WinTECH Client Toolkit
• Using WinTECH Client Toolkit - Alarms & Events Client

Building an OPC Server

• Using WinTECH Server Toolkit

OPC Utilities

• Techniques for Listing OPC Servers

Building an OPC Client

Using the OPC Custom Interfaces Directly

This is certainly the most flexible approach, and may consequently require more coding than the alternatives discussed below.

This sample was originally published by Ionel Munoz via the CodeCentral site. It has been extended here to include:

• server browser for selecting the required OPC server
• item browser for selecting an item to be displayed

More recently, Ionel Munoz also contributed to the update for C++Builder 6.

Download the ZIP file for C++Builder 4 (last updated 2003-Nov-28).

Download the ZIP file for C++Builder 6 (last updated 2003-Nov-28).

Using ActiveX Control from Softing

Making use of an ActiveX control minimizes the amount of coding required, but also offers the least flexibility.

The sample code shows how to use Softing's SOAXC ActiveX control. SOAXC is a component of Softing's OPC Toolbox ActiveX.

Download the ZIP file (last updated 2003-Nov-28).

Using WinTECH Client Toolkit

This approach offers a good compromise between flexibility and coding efficiency. The client programmer has no need to understand low-level COM programming, as the DLL totally encapsulates this functionality.

The first sample client allows you to connect to a local or remote server, create one or more groups using various update rates, and scan data items for display. You may also write values back to the server.

Download the ZIP file (last updated 2003-Nov-28).

The second demo client utilizes some of the advanced features of the WinTECH toolkit. The browsing operation of this client is more refined, presenting item names in the hierarchical format.

Download the ZIP file (last updated 2003-Nov-28).

Using WinTECH Client Toolkit - Alarms & Events Client

This demo is a simple Alarms & Events client that demonstrates the basic API of the WinTECH Client Toolkit.

Download the ZIP file (last updated 2003-Nov-28).

Building an OPC Server

Using WinTECH Server Toolkit

This demo is a simple OPC Server application that demonstrates the basic API of the WinTECH Server Toolkit. It is compatible with OPC 1.0 and 2.0 clients.

Download the ZIP file (last updated 2003-Nov-28).

OPC Utilities

Techniques for Listing OPC Servers

This sample shows how to obtain a listing of OPC servers from a local or remote machine using three different techniques:

• search through Windows Registry directly (as used in SST's client sample)
• search raw list via COM interface
• search with the help of OPCENUM

Download the ZIP file (last updated 2003-Nov-28).