Re: [PD] Looking for a way to add bytes to beginning of a file using [binfile]
If anyone is interested I wrote a tutorial on using [binfile] to create jpg images using only Pure Data http://www.hellocatfood.com/2012/09/23/create-jpgs-in-pure-data/ On 22 September 2012 18:02, Antonio Roberts anto...@hellocatfood.com wrote: After some experimenting I solved the problem. I first add the bytes that I want to add. I then use a second [binfile] object and use a loop ( [bang( / [until] ) to send each byte to the other [binfile]. This adds bytes instead of overwriting. On 22 September 2012 11:41, Jamie Bullock ja...@postlude.co.uk wrote: On 20 Sep 2012, at 17:33, Antonio Roberts anto...@hellocatfood.com wrote: I'm attempting to use [binfile] to add additional bytes to a file. If I first read the file - using [read( - and then specify the write position - [writeat 0 ( - when I add bytes they _overwrite_ the already existing bytes instead of adding new ones. Previously I have used one [binfile] object to read a file output each byte of it to another [binfile] object. This method has worked great for small files but when I'm faced with 60mb files it takes far too long! Is there a way to add bytes to the beginning of a file without overwriting? DId you solve this in the end? [binfile] could be trivially extended to allow an |insert( method, which inserts bytes without overwriting. However, I suspect this kind of insert operation is going to be relatively inefficient even if it's done on the C side. Another option, as I suggested off-list is to use [shell] + cat, but this isn't portable. Something else you could explore is using [pdlua] and a bit of Lua script: http://www.lua.org/pil/21.2.2.html For the sort of work you're doing it wouldn't hurt to incorporate pdlua into your toolbox anyhow. best, Jamie -- anto...@hellocatfood.com http://www.hellocatfood.com -- anto...@hellocatfood.com http://www.hellocatfood.com ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] Looking for a way to add bytes to beginning of a file using [binfile]
On 20 Sep 2012, at 17:33, Antonio Roberts anto...@hellocatfood.com wrote: I'm attempting to use [binfile] to add additional bytes to a file. If I first read the file - using [read( - and then specify the write position - [writeat 0 ( - when I add bytes they _overwrite_ the already existing bytes instead of adding new ones. Previously I have used one [binfile] object to read a file output each byte of it to another [binfile] object. This method has worked great for small files but when I'm faced with 60mb files it takes far too long! Is there a way to add bytes to the beginning of a file without overwriting? DId you solve this in the end? [binfile] could be trivially extended to allow an |insert( method, which inserts bytes without overwriting. However, I suspect this kind of insert operation is going to be relatively inefficient even if it's done on the C side. Another option, as I suggested off-list is to use [shell] + cat, but this isn't portable. Something else you could explore is using [pdlua] and a bit of Lua script: http://www.lua.org/pil/21.2.2.html For the sort of work you're doing it wouldn't hurt to incorporate pdlua into your toolbox anyhow. best, Jamie ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] Looking for a way to add bytes to beginning of a file using [binfile]
After some experimenting I solved the problem. I first add the bytes that I want to add. I then use a second [binfile] object and use a loop ( [bang( / [until] ) to send each byte to the other [binfile]. This adds bytes instead of overwriting. On 22 September 2012 11:41, Jamie Bullock ja...@postlude.co.uk wrote: On 20 Sep 2012, at 17:33, Antonio Roberts anto...@hellocatfood.com wrote: I'm attempting to use [binfile] to add additional bytes to a file. If I first read the file - using [read( - and then specify the write position - [writeat 0 ( - when I add bytes they _overwrite_ the already existing bytes instead of adding new ones. Previously I have used one [binfile] object to read a file output each byte of it to another [binfile] object. This method has worked great for small files but when I'm faced with 60mb files it takes far too long! Is there a way to add bytes to the beginning of a file without overwriting? DId you solve this in the end? [binfile] could be trivially extended to allow an |insert( method, which inserts bytes without overwriting. However, I suspect this kind of insert operation is going to be relatively inefficient even if it's done on the C side. Another option, as I suggested off-list is to use [shell] + cat, but this isn't portable. Something else you could explore is using [pdlua] and a bit of Lua script: http://www.lua.org/pil/21.2.2.html For the sort of work you're doing it wouldn't hurt to incorporate pdlua into your toolbox anyhow. best, Jamie -- anto...@hellocatfood.com http://www.hellocatfood.com ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
[PD] Looking for a way to add bytes to beginning of a file using [binfile]
I'm attempting to use [binfile] to add additional bytes to a file. If I first read the file - using [read( - and then specify the write position - [writeat 0 ( - when I add bytes they _overwrite_ the already existing bytes instead of adding new ones. Previously I have used one [binfile] object to read a file output each byte of it to another [binfile] object. This method has worked great for small files but when I'm faced with 60mb files it takes far too long! Is there a way to add bytes to the beginning of a file without overwriting? Thanks Antonio -- anto...@hellocatfood.com http://www.hellocatfood.com ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
