Java transferFrom Part of binary file?

Question

Im tring to transfer from a file filein starting at position 1300 (in uint8 pieces) into fileto, using the RandomAccessFile transferFrom function.

fromfile = java.io.RandomAccessFile(ifile, 'rw');
fromchannel = fromfile.getChannel();
tofile = java.io.RandomAccessFile(ofile, 'rw');
tochannel = tofile.getChannel();
tochannel.transferFrom(fromchannel,n,fromfile.length()-n)

tochannel.close();
fromchannel.close();
fromfile.close();
tofile.close();

My output file is just empty tho.

Anyone know what im doing wrong??

Edit 1:

I've changed

tochannel.transferFrom(fromchannel,n,fromfile.length()-n)

to

fromchannel.transferTo(n,fromfile.length()-n,tochannel)

But now the output is printing to the all the file right except for it puts alot of 00 hexadecimals where the header in the original was???

Scott · Accepted Answer · 2013-11-25 06:30:52Z

1

You want to use transferTo I believe

fromchannel.transferTo(n,fromfile.length()-n,tochannel)

as transferFrom tries to start at position n in the outfile, while transferTo will start at position n in the infile

answered Nov 25, 2013 at 6:30

Scott

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2 Comments

Alex Byasse Over a year ago

Ok, I changed the order tho to fromchannel.transferTo(n,fromfile.length()-n,tochannel). Its working except that the output file has alot of zeros at the start where the deleted header was??? Any Ideas

Scott Over a year ago

I'm not sure what would be causing you to get zeros at the start? Switching to a java.io.FileOutputStream might help.

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