1458Re: "ocaml_beginners":: Writing binary values to a file
- Nov 3, 2003Andrei Formiga <ktulu_fhtagn@...> writes:
> Hello everyone,One solution is to map the file using the function
> I want to encode an image to a specific binary
> format (BMP), writing the results in a file. The image
> has image data plus headers.
> The first problem is that I can't use OCaml's int
> type for that, as it's encoded differently. Or at
> least I can't simply write the int value, not even
> using output_binary_int, if I understand the manual
> correctly. Also, the header has fields of 32 and 16
> bits, and the image data will mostly consist of 8-bit
> bytes. For the bytes it's possible to use output_byte.
> What I don't know is how to write the 16-bits and
> 32-bits values correctly without depending too much on
> OCaml's internal representation for ints. For some
> 32-bits values I can use nativeint, but how can I
> output a nativeint in binary format ?
> Overall, my question is: how can I do that (write a
> binary file in a predetermined format) in OCaml ?
This function create a one dimension bigarray whose content is a
file. To modify the bigarray modify the file, So it might be a
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