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

eZine lover (@eZine)

Published in 

null magazine

 · 26 Dec 2020

  

 

 
    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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