| Simple
Visual Basic OPC Client |
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The Simple OPC Client example demonstrates
how to use the automation interface in Visual basic 5.0 or
better. The example largely follows the code structure found
in the OPC Automation Interface 2.0 specification. The code
is well commented and contains recomendations on how you
might develop your own customer OPC application. This example
is great if you need to do some very simple OPC connectivity.
The example only demonstrates a single OPC server connection
with only a single OPC group and a fixed list of OPC items.
The number of OPC items can be expanded easily. This example
and its source code is provided as part of the KEPServerEX
OPC Server download.
Complex Visual Basic OPC
Client
The Complex OPC Client example demonstrates how to use the
automation interface in Visual basic 5.0 or better. This
example was written to provide a robust full featured model
for using OPC server technology in your Visual Basic applications.
The example code uses the OPC Automation Interface 2.0 specification and expands
upon the object model provided by providing a set of VB class objects that wrap and augment
the automation interface. One of the big problems many developers face is how to connect
with multiple OPC servers, add multiple groups with multiple OPC items, and keep track of
all of the change events to keep the high levels of performance that OPC can provide. The
Complex OPC example gives you that foundation. No OPC client is complete without 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, no other controls should be needed. This example
and its source code is provided as part of the KEPServerEX OPC Server download.
Using Modems and Visual Basic with
KEPServerEX
Download Visual Basic source code for modem example
Visual Basic OPC Client Example and
KEPServerEX
Have questions, check out the Knowledge Base.
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