I'm having a problem with the parsecsv that I can't figure out.
Basically, in order to generate map tiles, I am opening five .csv files, and
reading from them. The map tiles are generated in pairs of twos. I can generate
25 pairs without any trouble, but the program always crashes when the 26th pair
is generated, after the set of five .csv files are opened for the 51st time.
This is the error thrown:
main.nim(38) main
main.nim(32) main
mainScreen.nim(627) mainScreen
mainScreen.nim(415) processInput
endTurnFunctions.nim(33) endTurn
tileGenerator.nim(1141) createMapTiles
tileGenerator.nim(34) generateTile
miscFunctions.nim(27) readCSV
parsecsv.nim(110) open
parsecsv.nim(79) error
parsecsv.nim(75) raiseEInvalidCsv
SIGSEGV: Illegal storage access. (Attempt to read from nil?)
Line 27 of miscFunctions refers to line 7 of readCSV():
p.open(fileName)
I believe the means that the .csv file can't be found, but it is found without
problem the first 50 times, and no exception is raised when
try:
discard open(fileName)
except:
raise newException(IOError, (fileName & " not found"))
is run. This, and the fact that it always happens after the same number of
files are opened, makes me think it is some sort of memory error, but I am
closing the file every time, so I am not sure why that would be. The full proc
is given below. If anyone has any idea of what the problem could be, I would
greatly appreciate the insight.
proc readCSV*(fileName: string, minRow: int, numRows: int = 1): auto =
var p: CsvParser
try:
discard open(fileName)
except:
raise newException(IOError, (fileName & " not found"))
echo fileName
p.open(fileName)
let rowsToRead = numRows - minRow
var tableEntries = newSeq[CSVRow](numRows) # will be appended as
tableEntries[y][x]
var convertedTable: seq[seq[string]] = @[]
for i in 0 .. (minRow + numRows - 1):
try:
discard p.readRow
if i >= minRow:
tableEntries[i - minRow] = p.row # i - minRow to begin indexing
at 0
except:
raise newException(IOError, "row not found")
# need to convert from tableEntries[y][x] to tableEntries[x][y]
for x in 0..<tableEntries[0].len:
convertedTable &= newSeq[string](tableEntries.len)
for y in 0..<rowsToRead:
for x in 0..<tableEntries[0].len:
convertedTable[x][y] = tableEntries[y][x]
p.close()
result = convertedTable
return result
