Hi,
I'm using DX4WIN 7.05.04 and I'm trying to get filtering on prefixes
to work. Either I totally misunderstand the way the "Prefixes/Zones
for Spotters" field works, or have discovered a bug.
When I enter OK into the "Prefixes/Zones for Spotters" field, I would
except to receive only spots from spotters in the Czech Republic.
However, I get spots from both Czech and US spotters. It looks as if
DX4WIN interprets the OK as any spots from spotters OK as well as
spots from spotters from substrings from OK (except the first
substring - see further!)!
I did a bit more experimenting (spots from I, K, DL, VK, PA, UA, EA
were available at the DX-cluster at that time):
specified filter prefix spotters displayed from
OK OK, K
OI I
KI I
IK K
ODL DL
OD none (there weren't any OD spots present)
VK VK and K
DLVK VK and K
PAVK VK and K
VKPA PA
So it looks like DX4WIN does the following:
1. It chops the specified filter prefix into chunks (eg. the prefix
VK is split into V and K)
2. It checks which chunks are valid prefixes (V isn't a valid prefix but K is)
3. It matches the spotters against the whole specified filter prefix
(VK) and all chunks EXCEPT THE FIRST ONE (in this example, only the K
chunck is checked)
The fact that the first chunk is discarded is not visible from the VK
example, but is visible from the KI example (K spotters were
discarded), and similarly from the IK example (I spotters were
discarded), and also from the DLVK, PAVK and VKPA examples.
Now, have I killed too many brain cells in last weekend's party, or
have I discovered quite an intricate pattern-matching bug?
As you may understand, the current behavior is undesired for me, as I
don't have much use for spots from stateside spotters, still get them
all when specifying a filter containing a K, such as OK...
73,
Frank PA4N
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