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NULL mag Issue 08 23 Get all msg.bases with mpy

eZine's profile picture
Published in 
null magazine
 · 3 years ago

  




i was trying to make a list of all message bases, using mpy in mystic
bbs. mystic has a built in function to get info from a msg. base,
using its id number called getmbaseid(). the logic thing to do, to get
a list of all bases is to make a loop and call the function, starting
with a msg.base id of one/1 and increasing that index (id) number,
until you get a False result, meaning that there is no msg.base with
that index number... right?

well... no... if the function doesn't find a msg.base with a specific
index, this doesn't mean that, there are no more bases in the
record... it only means, that for some reason, that particular
msg.base id, is missing/deleted.

the next logical thing would be, to make the loop, to search for...
let say... 100 bases... and store those results. again, wrong... cause
this may lead to other problematic cases... so the best way... i
think... is to make the following.

from the records.112 file, we get the record type of the mbases.dat
file and count the bytes. we want to know how many bytes is a record.

I HOPE YOU HAVE ALL READY READ AND LEARNED ABOUT BYTE COUNTING, FROM
AN ARTICLE IN A PREVIOUS ISSUE... RIGHT? >:|

for mystic bbs a43, the record size is 768 bytes. next, we get the
filesize of the mbases.dat file and divide it with this number. the
result will give us the exact number of msg.bases the file has stored.

mystic bbs, when you delete a msg.base, deleted the record of it
completely so we are sure that sizeof(mbases.dat) / record_size equals
to number of msg.bases.

now we have a number, that we can use in our loop and get all the info
we want. lets see the function and explain. the code is for mpy/python
2.7

#record size
mbase_size = 768

#global vars to store bases.
mbases = []
mbasesid = []

def getmbases():
global mbases
global mbasesid
#clear the lists
del mbases[:]
del mbasesid[:]

#get configuration settings from mystic bbs
cfg = getcfg()

#find the number of msg.bases we have by dividing the file size of the
#file mbases.dat with the record size
basecount = os.path.getsize(cfg["data"]+"mbases.dat") // mbase_size

#initialize loop count
i = 1
#get info for first base... i hope you have one at least :)
mb = getmbaseid(int(i))

#loop until we reach the "magic number"
while not shutdown() and i < basecount:
#if we did get info about a msg base, store info into our lists.
if mb is not None:
mbases.append(mb["name"])
mbasesid.append(mb["id"])
i +=1
mb = getmbaseid(int(i))

finito!!! now the two lists, have the name and id of all the lists in
the bbs.

you can configure the function to store what ever info you want. below
is the clean code for copy/paste.

=======================================================================

mbase_size = 768
mbases = []
mbasesid = []

def getmbases():
global mbases
global mbasesid
del mbases[:]
del mbasesid[:]
cfg = getcfg()

basecount = os.path.getsize(cfg["data"]+"mbases.dat") // mbase_size
i = 1
mb = getmbaseid(int(i))
while not shutdown() and i < basecount:
if mb is not None:
mbases.append(mb["name"])
mbasesid.append(mb["id"])
i +=1
mb = getmbaseid(int(i))





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