On 01/29/18 21:26, paul reeves wrote:
While debugging a an api call I got the error message in
which obviously means I need to check the dpb in this case but I'm
intrigued about this error message...
What is it actually trying to say?
- Is it just saying the same thing twice - because the tag value is
invalid it is obviously missing from the list of possible tag values ?
- Or is it that this tag value is not available among the possible tag
values for this call ?
Yes - almost so.
For some kinds of parameter blocks we support more than one format. For
example, since fb3 DPB can have traditional format with single byte for
length of the clumplet (isc_dpb_version1) or new wide format with 4
bytes for the length of the clumplet, on practice this is unlimited
clumplet length (isc_dpb_version2). When we prepare ClumpletReader (or
ClumpletWriter) to work with that block we can't know in advance what
format will be used, therefore parameter passed to ctor is a list of
pairs: tag, kind (struct KindList). When tag passed from outer world is
not found in this list we can't create an instance of the class cause we
do not know what format should it support and therefore raise an error.
What about the text - sooner of all this is result of bad translation
from russian to english and I'll be glad to fix this text to what you
can now suggest.
Alex.
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