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Get file position

Posted on 2004-08-30
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Last Modified: 2010-05-18
Hello,

I'm writing a text file. For reasons of convienience I use the PrintWriter object.

My problem is that at certain points during the file write operation I need to know
the current file pointer position. If this was a RandomAccessFile I would simply
do getFilePointer() method.

How do I know which byte position I'm at ?   Is there another way of doing this ?

Thanks.
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Question by:kxix
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8 Comments
 
LVL 24

Expert Comment

by:sciuriware
ID: 11930044
You can by using a "channel".
;JOOP!
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LVL 35

Expert Comment

by:girionis
ID: 11930061
How are you writing the data? Character by character? If yes then you coudl use a counter and count how many characters you write and then save the position somewhere. If you write a String then count the length of the string and get the last position every time. Do likewise for the other constructors (byte array or String with offsets).
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LVL 35

Expert Comment

by:girionis
ID: 11930066
> constructors (byte array or String with offsets).

should be

write method signatures (byte array or String with offsets).
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LVL 24

Accepted Solution

by:
sciuriware earned 250 total points
ID: 11930074
Example I used for input monitoring:

import java.nio.channels.FileChannel;

         FileInputStream fi = new FileInputStream(source);
         FileChannel fic = fi.getChannel();
.....
               position = fic.position();

And so on.

;JOOP!
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LVL 86

Expert Comment

by:CEHJ
ID: 11930142
>>I need to know the current file pointer position.

Why, may we ask?
0
 

Author Comment

by:kxix
ID: 11949152
The simplest answer seems to be to use a Channel as suggested by "sciuriware".
I therefore accept this answer.
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LVL 14

Expert Comment

by:sudhakar_koundinya
ID: 11949161
>> The simplest answer seems to be to use a Channel as suggested by "sciuriware".

Then we you gave just 'C' to he or she ???
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LVL 24

Expert Comment

by:sciuriware
ID: 11949269
Correct English would be:

"Then, why did you just give 'C' to him or her?"

And his opinion is .......  I don't care too much.

;JOOP!
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