vb.net - Substring not sub stringing string, or rather, substring not working as it should -


i'm working on application users can select values presented them, have specific form this: userdata_north, userdata_south.

i need part of string after _, tried doing substring this:

dim rightstring = userdatavar.substring(userdatavar.indexof("_"), userdatavar.length)

which believe gets whatever after _ , until string ends. returns nothing reason. i've gotten wrong?

you've mistaken how substring works. need following:

dim rightstring = userdatavar.substring(userdatavar.indexof("_") + 1)

the reason it's returning nothing because starting halfway through string , asking go entire length of string , going outside range of it.


-

Comments

Post a Comment

Popular posts from this blog

php - regexp cyrillic filename not matches -

i take list of files php glob(."*.pdf") . files have cyrillic names. example: ООО «Рога и копыта» then load company names database , try find them in file names: preg_match("/$firm_name/ui", $file_name, $match); i have problem: firms if $firm_name visually similar $file_name , preg_match says there no match. mb_detect_encoding both variables return utf-8. there problem in file name, or maybe there encoding or something, can not understand, ask help. upd: $file_name='ООО «Рога и копыта»'; preg_match("/... .Рога и копыта./ui", $file_name, $match); as result, ОО «Рога и копыта» , 1 О missing
Read more

c# - OpenXML hanging while writing elements -

Image
i have program pulls data database, caches file , exports data multiple formats (excel, excel 2003, csv). i'm using openxml sdk 2.0 excel work. these export processes run in parallel (using parallel.foreach ), , amount of data can pretty large - e.g. csvs 800mb. during these larger exports, i've noticed writing of xml documents hang. instance, if have 8 exporting in parallel, @ point "pause". hang around same point: //this.writer openxmlwriter created worksheetpart. this.writer.writeelement(new cell() { cellvalue = new cellvalue(value), datatype = cellvalues.string }); when happens, pause debugger (vs2013 in case) , notice threads blocking around same portion of code - bit deeper in openxml sdk - stem call openxmlwriter.writeelement . i dug through source using justdecompile didn't find answers. appears there intermediary stream in use writing isolated storage , is, reason, blocking. underlying stream each of these filestream . here screenshot ...
Read more

python - Scapy Dot11ReassoReq -

what scapy's dot11reassoreq, , do? sound ideal purposes: want make tool (among other things) searches hidden aps. code far: def tickle(*args,**kwargs): packs1=[] packs2=[] client in appinstance.sframe.interior.clients.copy(): pkt=dot11(addr1="ff:ff:ff:ff:ff:ff",addr2=client,addr3=client)/\ dot11deauth() packs1.append(pkt) client in appinstance.sframe.interior.clients.copy(): pkt=dot11(addr1="ff:ff:ff:ff:ff:ff",addr2=client,addr3=client)/\ dot11reassoreq(current_ap=client) packs2.append(pkt) packs1*=32 shuffle(packs1) packs2*=32 shuffle(packs2) packs=packs1+packs2 appinstance.stopprogressbar() appinstance.startprogressbardet(len(packs), "trying expose hidden ap's") pkt in packs: send(pkt,verbose=0) appinstance.progressbar.step() appinstance.stopprogressbar() however, wireshark re...
Read more