Hi Lewis,
On 2012-11-15 J. Lewis Muir wrote:
>
> The problem with this logic is that you're thinking of a waveform
> record's VAL field as a C string.
Sorry, but I'm not. I understand that waveform records can hold all kinds of
data, but I'm not asking this to be done for me personally. Think of my
recommendation as asking for a safety railing on a cliff-top.
> Another problem with including the NUL byte is that if I fetch a
> waveform record's VAL field from another language, say Java, I now have
> to do extra work by checking to see if the NUL byte is included and
> throw it away if it is; it's a totally bogus character in this context.
You'll have to do that anyway, because if you point your Java client using the
$ field modifier at an 80-char CALC field or a link address you *will* get a
Nil byte in it that terminates the string. With the current code that Nil
byte may be followed by non-Nil data from previous contents of that field
(because the field modifier code doesn't support dynamimc sizing yet anyway),
so code that converts a char array into a non-C string must stop at either the
first Nil or the end of the array.
Until we added dynamic array sizing CA could only give you ca_element_count()
characters with Nil values used to fill up the array after the first NORD
characters.
- Andrew
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- Replies:
- Re: Long string support in CA clients and device support J. Lewis Muir
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