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Decimal Problem

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08 Mar 2017 14:48 #4996 by support
Replied by support on topic Decimal Problem
After investigating this, it turned out to be a behavior as designed.

What happens is that if you pass in a string and the target type is different, QuickOPC attempts to make a conversion. In this case, the conversion is ultimately made by .NET-s Convert.ChangeTyp method (msdn.microsoft.com/en-us/library/ms130977(v=vs.110).aspx ), with InvariantCulture being used for the IFormatProvider.

In the invariant culture, the decimal separator is a dot '.', and commas ',' are used for "free formatting" and generally ignored.

There is a general rule within QuickOPC for all kinds of conversions: always, the invariant culture is used.

If you need to write numbers and you have them in a binary format, do not pass in string - simply pass in the number: That is, assign 99.99 to WriteValueArguments1.Value, and not '99.99' or '99,99'.

If you have a string and need to write a number, and you do not want the invariant culture be used, convert the string to a number in your code first, using whatever parsing needs you have, and then pass in the number you have obtained.

Best regards

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08 Mar 2017 10:20 - 08 Mar 2017 11:13 #4995 by alr1976
Replied by alr1976 on topic Decimal Problem
Kepware Server Simulation driver
data is Float ( {System.Single})
Attachments:
Last edit: 08 Mar 2017 11:13 by alr1976. Reason: I have attached Kepware Project. Kepware 5.19

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08 Mar 2017 10:02 #4994 by support
Replied by support on topic Decimal Problem
Hello,

do you know the data type of the node in the server? Is it a string? Which OPC server is that?

Thank you

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08 Mar 2017 09:56 - 08 Mar 2017 10:03 #4993 by alr1976
Decimal Problem was created by alr1976
Hi!

I write data to opc ua server but i problem with Decimal. I must to use '.' and not ',' to write decimal to opc ua tag.

For example i must write '99.00' to have '99,00'. If i write '99,99' i have 9999. I check Windows 10 Region configuration and it is correct.

my function is:
Function Write(EndpointDescriptorString :String;NodeDescriptorString :String;Value :Variant) :_UAWriteResult;
var
  Arguments: OleVariant;
  I: Cardinal;
  WriteResult: _UAWriteResult;
  WriteValueArguments1: _UAWriteValueArguments;
  Results: OleVariant;
  myClient: TEasyUAClient;
begin
  //CoInitializeEx(nil, COINIT_MULTITHREADED);
try
  WriteValueArguments1 := CoUAWriteValueArguments.Create;
  WriteValueArguments1.EndpointDescriptor.UrlString := EndpointDescriptorString;
  WriteValueArguments1.NodeDescriptor.NodeId.ExpandedText := NodeDescriptorString;
  WriteValueArguments1.Value := '99,99';//value;
 
 
  Arguments := VarArrayCreate([0, 0], varVariant);
  Arguments[0] := WriteValueArguments1;
    myClient := TEasyUAClient.Create(nil);
  // Modify values of nodes
  TVarData(Results).VType := varArray or varVariant;
  TVarData(Results).VArray := PVarArray(myClient.WriteMultipleValues(
    PSafeArray(TVarData(Arguments).VArray)));
 
  // Display results
 
    result := IInterface(Results[0]) as _UAWriteResult;
 
 
finally
     myClient.Free;
     //CoUninitialize;
 
end;
end;
Last edit: 08 Mar 2017 10:03 by support.

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