Re: Mathlink: How do I pass arbitrary data from Mathematica to C?

*To*: mathgroup at smc.vnet.net*Subject*: [mg86919] Re: Mathlink: How do I pass arbitrary data from Mathematica to C?*From*: Karen Bindash <KarenBindash at googlemail.com>*Date*: Wed, 26 Mar 2008 04:53:29 -0500 (EST)*References*: <fs4rmb$p3s$1@smc.vnet.net> <fsa5d2$abo$1@smc.vnet.net>

On 25 Mar, 06:17, ragfield <ragfi... at gmail.com> wrote: > On Mar 23, 1:00 am, Karen Bindash <KarenBind... at googlemail.com> wrote: > > > Does that make sense? Any ideas how to pass arbitrary data to a C > > program? > > You won't be able to do this directly. You will have to write your > own C function that converts the data from aMathematicatype to the > raw data your function is expecting. This is not very difficult. Try > something like this (not tested): > > /* MyFile.tm */ > > :Begin: > :Function: myFunc > :Pattern: MyFunc[reals:(_Real...)] > :Arguments: { reals } > :ArgumentTypes: Manual > :ReturnType: Manual > :End: > But this makes nom sence to me, as my data is not necessarily going to consist of real numbers. It might do, but I certainly dont wish to assume thst. > /* library function to call */ > extern int g(const double* theData, int theLength); > The function I am calling will have the prototype int g (void *data, int length_of_data) I did wonder if it should be treated as a collection of unsigned characters, but I'm not sure if a Mathematica String would be appropiate, as then characters like "\n" (new line) might have some significance, which I dont want them to.