c# - Compiled Matlab function works only once -

i have matlab function compiled c library. using library c# application.

if call function in c library first time, works fine, second call causes exception - mlfmyfunc returns null pointer insted pointer results (output1 , output2 parameters intptr.zero after mlfmyfunc call)

my doublearray class (wrapper around mx... functions), tested , think works correctly.

do have idea problem be?

thanks. lukas

c# code:

using native;   class matlabalgosbridge {    [dllimport("algos.dll"]    private static extern bool algosinitialize();     [dllimport("algos.dll")]    private static extern void algosterminate();     [dllimport("algos.dll")]    private static extern bool mlfmyfunc([in] int nargout, ref intptr output1, ref intptr output2, [in] intptr xvar, [in] intptr time, [in] intptr algoparam, [in] intptr ts, [in] intptr codes);    public list<double> analyze(list<double> xvalues) {     double[] result = null;     try {       native.mcl.mclinitializeapplication("null", 0)       algosinitialize();        doublearray xvalm = doublearray.creatematrix(xvalues.data.count, 1);       // other parameter initialization         intptr output1 = intptr.zero;       intptr output2 = intptr.zero;        mlfmyfunc(2, ref output1, ref output2, xvalm.pointer, time.pointer, params.pointer, ts.pointer, codes.pointer);        result = new marray(output1).asdoublevector();     }     {       algosterminate();       native.mcl.mclterminateapplication();     }      return result;    } } 

solution:

the problem caused repetitionary matlab engine initialization. each time call analyze function engine gets initialized (native.mcl.mclinitializeapplication] , it's being terminated (native.mcl.mclterminateapplication) in finally block, goes wrong repetitionary initialization. built in matlab functions still works properly, library don't.

the solution moving mclinitializeapplication call outside analyze function , ensuring it's called once in application lifetime.

the problem caused repetitionary matlab engine initialization. each time call analyze function engine gets initialized (native.mcl.mclinitializeapplication) , it's being terminated (native.mcl.mclterminateapplication) in block, goes wrong repetitionary initialization. built in matlab functions still works properly, library don't.

the solution moving mclinitializeapplication call outside analyze function , ensuring it's called once in application lifetime.