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Incorrect Data Type Display
28 Oct 2013 18:18 #1520
by support
Replied by support on topic Incorrect Data Type Display
I do not see anything wrong - this behavior is by design. Here is one of the "OnReadComplete" notifications:
The value returned by the server is a one-dimensional array of VT_UI4. A corresponding .NET type would be an array of UInt32, but not all .NET languages can process it. Our component conforms to CLS (Common Language Specification), which allows the broadest interoperability. For this reason, the array of VT_UI4 is converted to array of Int64 before passing onto the application.
This behavior is documented in the Concepts, see Advanced Topics -> Data Types -> Data Types in OPC "Classic".
Also:
msdn.microsoft.com/en-us/library/12a7a7h3(v=vs.110).aspx#Types
The value returned by the server is a one-dimensional array of VT_UI4. A corresponding .NET type would be an array of UInt32, but not all .NET languages can process it. Our component conforms to CLS (Common Language Specification), which allows the broadest interoperability. For this reason, the array of VT_UI4 is converted to array of Int64 before passing onto the application.
This behavior is documented in the Concepts, see Advanced Topics -> Data Types -> Data Types in OPC "Classic".
Also:
msdn.microsoft.com/en-us/library/12a7a7h3(v=vs.110).aspx#Types
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