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

*To*: mathgroup at smc.vnet.net*Subject*: [mg86883] Re: Mathlink: How do I pass arbitrary data from Mathematica to C?*From*: ragfield <ragfield at gmail.com>*Date*: Tue, 25 Mar 2008 01:15:37 -0500 (EST)*References*: <fs4rmb$p3s$1@smc.vnet.net>

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 a Mathematica type 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: /* library function to call */ extern int g(const double* theData, int theLength); void myFunc(void) { double* theData; int* theDims; char** theHeads; int theDepth; if(MLGetReal64Array(stdlink, &theData, theDims, &theHeads, &theDepth)) { int theLength = theDims[0], i, theResult; for(i = 1; i < theDepth; i++) theLength *= theDims[i]; theResult = g(theData, theLength); MLReleaseReal64Array(stdlink, theData, theDims, theHeads, theDepth); MLPutInteger(stdlink, theResult); } else MLPutSymbol(stdlink, "$Failed"); }