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 <[email protected]> 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 <[email protected]> wrote: >> >> On 20 Sep 2012, at 17:33, Antonio Roberts <[email protected]> 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 >> >> >> > > > > -- > ============================ > [email protected] > http://www.hellocatfood.com > ============================ -- ============================ [email protected] http://www.hellocatfood.com ============================ _______________________________________________ [email protected] mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
