Thread View: att.lang.c++
2 messages
2 total messages
Started by Henry Zektser
Sat, 13 May 2000 00:00
more strtok()
Author: Henry Zektser
Date: Sat, 13 May 2000 00:00
Date: Sat, 13 May 2000 00:00
10 lines
1217 bytes
1217 bytes
Ok, I know I'm harassing everyone with this one function, but nothing else gives me any trouble. At the moment I'm using ifstream::getline() to read a file line by line into a char*, which I'm using a strtok() call on, with the separators being ' \n' (space and newline) and maxchars being far bigger than the width of the file. It works fine, unless I leave a blank line (hit enter twice in notepad, and save). Then it gives me an access violation error. What exactly does getline return in this case, and/or why isnt strtok handling it correctly? H
Re: more strtok()
Author: John Harrison
Date: Sun, 14 May 2000 00:00
Date: Sun, 14 May 2000 00:00
27 lines
1869 bytes
1869 bytes
Henry Zektser <kdentdev@hotmail.com> wrote in message news:8fl019$8o5$1@bob.news.rcn.net... > Ok, I know I'm harassing everyone with this one function, but nothing else > gives me any trouble. At the moment I'm using ifstream::getline() to read a > file line by line into a char*, which I'm using a strtok() call on, with the > separators being ' \n' (space and newline) and maxchars being far bigger > than the width of the file. It works fine, unless I leave a blank line (hit > enter twice in notepad, and save). Then it gives me an access violation > error. What exactly does getline return in this case, and/or why isnt strtok > handling it correctly? > > H > > In this case getline returns a zero length string. Given a zero length string strtok will return 0 (otherwise known as NULL). I would guess that your code assumes that a line contains at least one valid token and therefore you end up deferencing a null pointer. But without seeing your code its only a guess, don't be shy, POST YOUR CODE. john
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