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<a href="http://www.kepware.com/Products/KEPServerEX_VB_Install.asp">VB OPC Client Source Code</a>
Simple OPC Client code for Visual Basic .NET
Kepware's OPC server works very well with OPC client applications developed in .NET. Customers have been using this free sample code for 2+ years with great success. The Visual Basic for .NET client code largely follows the code structure found in the OPC Automation Interface 2.0 specification. The code is well commented and contains recommendations on how you might develop your own custom OPC application. This example is great if you need to perform basic OPC connectivity. The example demonstrates a single OPC server connection with a single OPC group and a fixed list of OPC items. The number of OPC items can be expanded easily.
Simple OPC Client code for Visual Basic 5.0 & 6.0
The Simple OPC Client example demonstrates how to use the automation interface in Visual Basic 5.0 & 6.0. Customers have been using this free sample code for 5+ years. The VB OPC client code follows the code structure found in the OPC Automation Interface 2.0 specification. Kepware's code is well commented and contains recommendations on how you might develop your own custom OPC application. This example is great if you need to perform basic OPC connectivity to a single OPC server. The example demonstrates a single OPC server connection with a single OPC group and a fixed list of OPC items. The number of OPC items can be expanded easily. This example OPC client for VB source code is also provided as part of the KEPServerEX product suite.
Complex OPC Client code for Visual Basic 5.0 & 6.0
This example was written to provide a robust, full-featured model for OPC client enabling your Visual Basic 5.0 & 6.0 applications. The example code uses the OPC Automation Interface 2.0 specification and expands upon the object model by providing a set of VB Class Objects that "wrap" and augment the automation interface. One of the common problems developers face is how to connect with multiple OPC servers, add multiple Groups with multiple OPC Items, and keep track of change events to maintain the high levels of performance that OPC can provide. The Complex OPC example provides these capabilities. Additionally, because no OPC client is complete without the capability to perform OPC Tag Browsing the Complex OPC Client example implements a complete Tag Browsing interface with filtering.
The example uses only standard VB Controls such as the Tree Control and List View. Other than the OPC automation interface objects (provided in this download), no other controls should be needed.
OPC Client code for Visual C++
The source code provided here is for a "lite" version of our OPC Quick Client application. Extensive code remains which will assist developers in understanding how to use OPC in their VC++ applications. This proven code has been available for several years and is used extensively by our developers and quality control engineers. From the sample OPC client code for Visual C++ you will see how to Browse OPC servers, Connect to them, add Groups and Items, and Read and Write data. OPC Data Access versions 1.0 and 2.0 are supported. You may borrow freely from this code to create your own OPC client enabled applications.
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