null - Lua: String is nil after explicitly checking for nil -
i have made script patient data database.
it works first few hundreds of patients, @ random point error:
*** lua run error batchdicommove.lua:91: attempt compare nil string in 'dofile('batchdicommove.lua')'
even despite explicitly checking whether argument nil or not. furthermore when make changes in code (like adding empty line). error occur in place a. accessed.
what wrong?
-- execute script calling: dgate "--lua:dofile('batchdicommove.lua')" -- mop: query=study|series move=study+studyinstanceuid -- gepacs_rsd: query=* move=series inputfile = 'patientlist.txt' srcaet = 'nukalfa' destaet = 'onco_pacs_rd' modalities = {'ct','pt'} includestr = {'standard','standard','ac'} -- if non desired enter {} includeorand = 'or' -- choose 'and', 'or' excludestr = {'nac','ctac'} -- if non desired enter {} excludeorand = 'nor' -- choose 'neither', 'nor' select = 'newest' -- choose 'newest', 'oldest', 'all' relativetotime = 'before' -- choose 'before', 'after', 'exact' line in io.lines(inputfile) -- loop through patients date = '' date1 = '' date2 = '' stringsplit = string.find(line,' ') if stringsplit == nil ptid = line else ptid = string.sub(line,0,stringsplit-1) date = string.sub(line,stringsplit+1) if string.len(date) == 18 stringsplit = string.find(date,' ') if stringsplit == nil date = '' else date = '' date1 = string.sub(date,0,stringsplit-1) date2 = string.sub(line,stringsplit+1) end elseif string.len(date) ~= 9 date = '' end end -- ptidalts ensures patient found nomater if '-' included in id or not stringsplit = string.find(ptid,'-') if stringsplit == nil ptid = string.sub(ptid,0,7) .. '-' .. string.sub(ptid,8) end stringsplit = string.find(ptid,'-') ptidalts = {ptid,string.sub(ptid,0,stringsplit-1) .. string.sub(ptid,stringsplit+1)} print(' query: patient', ptidalts[1], 'from', srcaet, 'to', destaet) -- loop have been added part of implementation of ptidalts b = {} key, ptid in ipairs(ptidalts) key, modality in ipairs(modalities) -- create query dicom move q = newdicomobject() q.patientid = ptid q.modality = modality -- values retrive should included in query q.studyinstanceuid = '' q.seriesinstanceuid = '' q.patientname = '' q.seriesdescription = '' q.studydate = '' -- execute query infomation on patient data on source machine = dicomquery(srcaet, 'series', q) -- sets queryretrievelevel @ call time i=1,#a b[#b+1] = a[i-1] end end end -- remove unwanted resultes c = {} if date ~= '' i, in ipairs(b) if a.studydate ~= nil if relativetotime == 'exact' if a.studydate == date c[#c+1] = end elseif relativetotime == 'before' if a.studydate <= date c[#c+1] = end else if a.studydate >= date c[#c+1] = end end end end elseif (date1 ~= '') , (date2 ~= '') i, in ipairs(b) if (a.studydate ~= nil) , (a.studydate >= date1) , (a.studydate <= date2) c[#c+1] = end end else c = b end b = c c = {} if #includestr ~= 0 key, in ipairs(b) if a.seriesdescription ~= nil if includeorand == 'or' key, include in ipairs(includestr) if string.match(a.seriesdescription,include) ~= nil c[#c+1] = break end end else key, include in ipairs(includestr) if string.match(a.seriesdescription,include) == nil break end c[#c+1] = end end end end b = c end c = {} if #excludestr ~= 0 key, in ipairs(b) if a.seriesdescription ~= nil if excludeorand == 'nor' key, exclude in ipairs(excludestr) if string.match(a.seriesdescription,exclude) ~= nil break end c[#c+1] = end else key, exclude in ipairs(excludestr) if string.match(a.seriesdescription,exclude) == nil c[#c+1] = break end end end end end b = c end c = {} if select == 'newest' key, modality in ipairs(modalities) i, in ipairs(b) if a.studydate ~= nil if c[key] == nil c[key] = elseif c[key].studydate < a.studydate c[key] = end end end end elseif select == 'oldest' key, modality in ipairs(modalities) i, in ipairs(b) if a.studydate ~= nil if c[key] == nil c[key] = elseif c[key].studydate > a.studydate c[key] = end end end end else c = b end b = c n = #b print(' query results:', n) key, in ipairs(b) cmd = newdicomobject() cmd.patientid = b.patientid cmd.studyinstanceuid = b.studyinstanceuid cmd.seriesinstanceuid = b.seriesinstanceuid if srcaet == 'mop_scp' cmd.queryretrievelevel = 'study' -- level supported mop dicom move cmd.modality = b.modality else cmd.queryretrievelevel = 'series' -- tested on gepacs_rsd end -- execute move --dicommove(srcaet, destaet, cmd); end end print(' done.')
there comparisons in file on line 90 , 94:
line 90: if a.studydate <= date line 94: if a.studydate >= date we can see a.studydate not nil because checked @ line 84. therefore, guess date nil.
another place on line 102:
if (a.studydate ~= nil) , (a.studydate >= date1) , (a.studydate <= date2) again, check date1 , date2 not nil.
in same vein, should check 'c[key].studydate' line 178.
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