If you are manually modifying serialized json data, you need to use json serialization function to append another key/value pair.  Avoid manual editing of json data unless you are 100% json expert.

Saadettin KURTOGLU

Greetings,

Application using the LStream library

(link: https://support.industry.siemens.com/cs/us/en/view/109781165 )

After reading "demo.json" file from MMC, when "json_deserialize" is done, the last value is "lastUpdated": "2023-04-04T06:40:37+00:00" cannot be deserialized !

I enter this data manually manually,

Then, when the "json_serialize" operation is performed, the "demo_out.json" file that it saves to the MMC does json parse incorrectly.

How can we solve this problem.

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Searches for ',' at the end of the last "key-value" pair of the searched array. Since it cannot find this character, it does not write the value of the last key.

When it reaches the end of the searched array, it should not look for ',' and instead look for '}' and print the last value?

In which lines should we make these changes?

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Split from Library for Data Streams (LStream) bug report.

OHHH, so now when I see the topic title, in my mind, I will instead see the following:
[BUG REPORT] LHTTP_JsonDeserializer Drops Last JSON key/value pair

In the library documentation toward the very end right above the index is a link you can use to alert the developer(s) of the problem.

If you want to fix it yourself, you will probably want to submit a support request for assistance from Siemens before digging into it too deeply on your own.

Saadettin KURTOGLU

No, no. I'm not manually changing the data or adding a new key/value pair. I'm talking about a bug in the block in the library, which is solved by a manual intervention.

I am talking about the "LStream_JsonDeserializer FB6" function block in the 109781165_LStream example. When comparing the "demo.json" file read by the "FileReadC" block and the "demo_out.json" file written by the "FilewriteC" block, the value of the key/value pair at the end is not written to the file.

I have developed a Web API application. I test the API with Postman and get all json data correctly. Using the LHTTP_Get block in the LHTTP library, I get the data through the Web API without any problems. There is no problem as raw data. But when I read the data using the "LStream_JsonDeserializer" block in the LStream library, I saw that the key/value pair at the end did not write the "value" content into the data_block. I wanted to express that this situation was "temporarily" solved as I mentioned above during the tests I did. How can we solve this problem permanently. What changes should we make in the related function block?