Computer Science Canada searching and retriving specific information in a file. |
| Author: | TokenHerbz [ Tue Apr 25, 2006 6:19 pm ] |
| Post subject: | searching and retriving specific information in a file. |
Hey, i was looking threw some tut's and didn't find anything to help me, and neither did that F10... So i ask, can you read and write informaion in a spefic spot? meaning: i have a file: i want to add to it, line2, "this is a test", then again line 3" another test" now i want to read just line 2, not line 1 or 3... and get my vars (strings) Anyways, anything to help me would be pleasent... |
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| Author: | TokenHerbz [ Tue Apr 25, 2006 6:23 pm ] | ||
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I cant edit: I wanted to add this cause my previous post is a little hard to understand maybe, i want to read and write by lines in the file
each line should have 3 vars in my program.. I want to beable to access only certain lines when needed, be able to add more, and delete them. Sorry for that post  no edit tho. |
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| Author: | Cervantes [ Tue Apr 25, 2006 6:27 pm ] | ||
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You can use seek and tell in tandem to move to different parts of your file. However, even with these tools you cannot jump directly to a given line (unless you know how many bytes in a given line is). You can cycle through lines, storing them in a temp variable, until you get the desired line. As for adding more, you just have to open the file with the mod option.
I think that's the syntax. |
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| Author: | MysticVegeta [ Tue Apr 25, 2006 6:40 pm ] |
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Cervantes wrote: I think that's the syntax.
not really |
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| Author: | TokenHerbz [ Tue Apr 25, 2006 7:27 pm ] |
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that says: "I think that's the syntax." (for people with bad eyes) well i will try with these tools, any other info would be nice. |
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| Author: | TokenHerbz [ Tue Apr 25, 2006 7:45 pm ] |
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EDIT: Cervantes wrote: [code] (unless you know how many bytes in a given line is). [code] Can i check how many letters and spaces there are up to the givin line and use that info to determin where to start reading? [code] var1 var2 var3 var4 var5 var6 var7 var8 var7 %%all differnent length strings 
[/code] even if i found away to start reading at var 4, how do i only read var4, var5, var6??? and leave everything else there. |
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| Author: | Cervantes [ Tue Apr 25, 2006 8:14 pm ] | ||
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Sorry, forgot the filename.
TokenHerbz: If you're at line 2 (var4), then just read the whole line to get var4, var5, and var6. You can use : * to get the whole line then break it up yourself, or you can omit the : * to get data separated by spaces. If you don't want to read the vars after var6, you just don't read/get them. |
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| Author: | MysticVegeta [ Wed Apr 26, 2006 1:39 pm ] |
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TokenHerbz wrote: that says: "I think that's the syntax." (for people with bad eyes)
you know you could just copy it and paste it anywhere else to see what that means right? |
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