Issue with using ArEventLog in a custom library

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1

I made a small function block library that makes the logging of a message easier, But noticed a problem when writing messages to the logger. When a short message is written after sending a longer message part of the old message still shows.
This problem only occures when writing from the library, not when the function block internals are copy pasted in a program.

These messages show the difference where the bottom two are written form the library function block and the top two are from a program.
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I thought the problem lies somwhere in the buffer that is used to write the message as ASCII data.
So instead of just using the following code snippet.
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and then calling the write function like this:

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image472×135 3.15 KB

To try and fix the issue I tried resetting and writing to the buffer with the memset function.

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With these i can see that the buffer is reset correctly after each message but in the logbook the problem persists.

Does anyone know a possible fix for this or is it not possible to write from a logbook like this?

2

Hi,

as I remember ArEventLogWrite() needs the exact data length at .AddDataSize. So please try using the string length at .AddDataSize, e.g. brsstrlen(ADR(Global_buffer)) instead of sizeof(Global_buffer).

The internal buffers of the ArEventLogWritr() is used universal, I think that it isn’t initialized even if you initialize the data source buffer.

Best regards!

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3

The string length at .AddDataSize was indeed the problem, Thank you.

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