检查文件是否已更改且仅打印新数据的有效方法是什么?
最初,我倾向于使用比较线方法来比较线数,但这看起来非常低效。
我的初步查询是否有办法从Netlogo检查文件大小或时间戳。答案是'不'。但是,Charles Staelin非常友好地将get-date-ms方法添加到pathdir扩展中。因此,现在可以使用set currenttimestamp pathdir:get-date-ms "somefile.nlist"
if currenttimestamp != filetimestamp
使用添加的方法:
to checkfile
ifelse checktick mod 19 = 0
[set currenttimestamp pathdir:get-date-ms "somefile.nlist"
if currenttimestamp != filetimestamp
[file-open "somefile.nlist"
let thiscount 0
while [not file-at-end?][
set in1 file-read-line
set global-in1 in1
set thiscount thiscount + 1
if thiscount > global-filelength AND (not file-at-end?)[ ;it seems that this not-at-file-end is redundant - why not?
print in1
set global-filelength thiscount
set hasfilechanged true
]
]
file-close
set filetimestamp currenttimestamp
set checktick checktick + 1
]
]
[ set checktick checktick + 1]
end
答案 0 :(得分:0)
Charles Staelin最近将此添加到他的pathdir
扩展中,该扩展为NetLogo添加了各种各样的文件和路径导向基元。见http://groups.yahoo.com/group/netlogo-users/message/15301。该扩展程序列在https://github.com/NetLogo/NetLogo/wiki/Extensions