How to use Matlab DLL in other program (Delphi) ?

I am trying to implement a DLL created with Matlab in a Delphi/Pascal code. I am just testing the mechanism of DLL inegration right now so the DLL is just a fonction with two argument values and return the sum of them.

I did some researchs in the process of Matlab DLL integration and I understood that the DLL contains several functions, those I must use are (in order) mlf<dll_name (the function that calculate) and then <dll_name>Terminate.

I wrote that and launch my delphi code. Then an error report from the Matlab Runtime environment were created (see below).

Can I have more information on Matlab DLL integration ? I read that argument and return values of the DLL must be pointers and double type, is that true for all the DLL created with Matlab ?

if true
  % ------------------------------------------------------------------------
        Access violation detected at Wed Mar 15 15:00:53 2017
------------------------------------------------------------------------
Configuration:
Crash Decoding      : Disabled - No sandbox or build area path
Crash Mode          : continue (default)
Current Graphics Driver: Unknown hardware 
Default Encoding    : windows-1252
Deployed            : true
Graphics card 1     : NVIDIA ( 0x10de ) NVIDIA Quadro M1000M Version 21.21.13.7306
Graphics card 2     : Intel Corporation ( 0x8086 ) Intel(R) HD Graphics 530 Version 20.19.15.4483
Host Name           : HOLBYTLAN
MATLAB Architecture : win64
MATLAB Entitlement ID: Unknown
MATLAB Root         : C:\Program Files\MATLAB\R2016b
MATLAB Version      : 9.1.0.441655 (R2016b)
OpenGL              : hardware
Operating System    : Microsoft Windows 10 Professionnel
Processor ID        : x86 Family 6 Model 94 Stepping 3, GenuineIntel
Virtual Machine     : Java 1.7.0_60-b19 with Oracle Corporation Java HotSpot(TM) 64-Bit Server VM mixed mode
Window System       : Version 10.0 (Build 14393)
Fault Count: 1
Abnormal termination:
Access violation
Register State (from fault):
RAX = 0000000009a8e170  RBX = 0000000000000000
RCX = 0000000000000000  RDX = 0000000000000000
RSP = 0000000009a8dee8  RBP = 0000000009a8df30
RSI = 0000000009a8e050  RDI = 0000000000000000

   R8 = 0000000000000002   R9 = 0000000007777a30
  R10 = 000000001e2f54d0  R11 = 0000000024fe3040
  R12 = 0000000009a8e600  R13 = 00000000ffffffff
  R14 = 000000000072e770  R15 = 0000000024fe3040

RIP = 00000000023cce60  EFL = 00010206

   CS = 0033   FS = 0053   GS = 002b
Stack Trace (from fault):
[  0] 0x00000000023cce60 C:\Program Files\MATLAB\R2016b\bin\win64\libmx.dll+00052832 mxArray_tag::is_scalar_double_flag_set+00000000
[  1] 0x000000000777634f C:\Program Files\MATLAB\R2016b\bin\win64\libmwlxetypes.dll+00025423 MathWorks::lxe::xvalue::MaybeInitializeOptimizedValueFromMxArray+00000047
[  2] 0x0000000007776813 C:\Program Files\MATLAB\R2016b\bin\win64\libmwlxetypes.dll+00026643 MathWorks::lxe::xvalue::xvalue+00000051
[  3] 0x000000000777679f C:\Program Files\MATLAB\R2016b\bin\win64\libmwlxetypes.dll+00026527 MathWorks::lxe::xvalue::CopyMxArrayToXvalue+00000019
[  4] 0x00000000049cc020 C:\Program Files\MATLAB\R2016b\bin\win64\m_lxe.dll+00704544 boost::serialization::singleton<boost::archive::detail::iserializer<boost::archive::binaryTerm_iarchive,ir::IrTree> >::get_instance+00615468
[  5] 0x0000000004ae618c C:\Program Files\MATLAB\R2016b\bin\win64\m_lxe.dll+01859980 boost::serialization::singleton<boost::serialization::void_cast_detail::void_caster_primitive<ir::IrTree,MathWorks::utl::attachment> >::get_instance+00304720
[  6] 0x0000000004a01b46 C:\Program Files\MATLAB\R2016b\bin\win64\m_lxe.dll+00924486 boost::serialization::singleton<boost::archive::detail::iserializer<boost::archive::binaryTerm_iarchive,ir::IrTree> >::get_instance+00835410
[  7] 0x0000000004a01d9b C:\Program Files\MATLAB\R2016b\bin\win64\m_lxe.dll+00925083 boost::serialization::singleton<boost::archive::detail::iserializer<boost::archive::binaryTerm_iarchive,ir::IrTree> >::get_instance+00836007
[  8] 0x0000000004a01939 C:\Program Files\MATLAB\R2016b\bin\win64\m_lxe.dll+00923961 boost::serialization::singleton<boost::archive::detail::iserializer<boost::archive::binaryTerm_iarchive,ir::IrTree> >::get_instance+00834885
[  9] 0x0000000004a01884 C:\Program Files\MATLAB\R2016b\bin\win64\m_lxe.dll+00923780 boost::serialization::singleton<boost::archive::detail::iserializer<boost::archive::binaryTerm_iarchive,ir::IrTree> >::get_instance+00834704
[ 10] 0x00000000046c46de C:\Program Files\MATLAB\R2016b\bin\win64\m_dispatcher.dll+00018142 Mfh_file::dispatch_fh_impl+00000434
[ 11] 0x00000000046c44fa C:\Program Files\MATLAB\R2016b\bin\win64\m_dispatcher.dll+00017658 Mfh_file::dispatch_fh_with_reuse+00000062
[ 12] 0x00000000049f5166 C:\Program Files\MATLAB\R2016b\bin\win64\m_lxe.dll+00872806 boost::serialization::singleton<boost::archive::detail::iserializer<boost::archive::binaryTerm_iarchive,ir::IrTree> >::get_instance+00783730
[ 13] 0x00000000049740b7 C:\Program Files\MATLAB\R2016b\bin\win64\m_lxe.dll+00344247 boost::serialization::singleton<boost::archive::detail::iserializer<boost::archive::binaryTerm_iarchive,ir::IrTree> >::get_instance+00255171
[ 14] 0x000000000497430a C:\Program Files\MATLAB\R2016b\bin\win64\m_lxe.dll+00344842 boost::serialization::singleton<boost::archive::detail::iserializer<boost::archive::binaryTerm_iarchive,ir::IrTree> >::get_instance+00255766
[ 15] 0x00000000049c38ea C:\Program Files\MATLAB\R2016b\bin\win64\m_lxe.dll+00669930 boost::serialization::singleton<boost::archive::detail::iserializer<boost::archive::binaryTerm_iarchive,ir::IrTree> >::get_instance+00580854
[ 16] 0x0000000004b31a56 C:\Program Files\MATLAB\R2016b\bin\win64\m_lxe.dll+02169430 boost::archive::detail::oserializer<boost::archive::binaryTerm_oarchive,boost::shared_ptr<MathWorks::lxe::MatlabIrTree> >::oserializer<boost::archive::binaryTerm_oarchive,boost::shared_ptr<MathWorks::lxe::MatlabIrTree> >+00001726
[ 17] 0x0000000004b319e9 C:\Program Files\MATLAB\R2016b\bin\win64\m_lxe.dll+02169321 boost::archive::detail::oserializer<boost::archive::binaryTerm_oarchive,boost::shared_ptr<MathWorks::lxe::MatlabIrTree> >::oserializer<boost::archive::binaryTerm_oarchive,boost::shared_ptr<MathWorks::lxe::MatlabIrTree> >+00001617
[ 18] 0x00000000049c2ca2 C:\Program Files\MATLAB\R2016b\bin\win64\m_lxe.dll+00666786 boost::serialization::singleton<boost::archive::detail::iserializer<boost::archive::binaryTerm_iarchive,ir::IrTree> >::get_instance+00577710
[ 19] 0x0000000003000123 C:\Program Files\MATLAB\R2016b\bin\win64\m_interpreter.dll+00196899 inCallFcnWithTrapInDesiredWSAndPublishEvents+00000071
[ 20] 0x00000000033fcf52   C:\Program Files\MATLAB\R2016b\bin\win64\iqm.dll+00315218 iqm::BaseFEvalPlugin::inCallFcnWithTrap+00000066
[ 21] 0x00000000033fcb7f   C:\Program Files\MATLAB\R2016b\bin\win64\iqm.dll+00314239 iqm::BaseFEvalPlugin::execute+00000335
[ 22] 0x00000000fd0cae39   C:\Program Files\MATLAB\R2016b\bin\win64\mcr.dll+00306745 mcrRegisterExternalFunction+00035625
[ 23] 0x00000000033f42fa   C:\Program Files\MATLAB\R2016b\bin\win64\iqm.dll+00279290 iqm::Iqm::setupIqmFcnPtrs+00071530
[ 24] 0x00000000033f41d3   C:\Program Files\MATLAB\R2016b\bin\win64\iqm.dll+00278995 iqm::Iqm::setupIqmFcnPtrs+00071235
[ 25] 0x00000000033d9e5a   C:\Program Files\MATLAB\R2016b\bin\win64\iqm.dll+00171610 iqm::Iqm::deliver+00003274
[ 26] 0x00000000033dad2f   C:\Program Files\MATLAB\R2016b\bin\win64\iqm.dll+00175407 iqm::Iqm::deliver+00007071
[ 27] 0x0000000002cd8173 C:\Program Files\MATLAB\R2016b\bin\win64\libmwservices.dll+01147251 services::system_events::PpeDispatchHook::dispatchOne+00019059
[ 28] 0x0000000002cdc3a3 C:\Program Files\MATLAB\R2016b\bin\win64\libmwservices.dll+01164195 sysq::addProcessPendingEventsUnitTestHook+00001923
[ 29] 0x0000000002cdc580 C:\Program Files\MATLAB\R2016b\bin\win64\libmwservices.dll+01164672 sysq::addProcessPendingEventsUnitTestHook+00002400
[ 30] 0x0000000002cdd685 C:\Program Files\MATLAB\R2016b\bin\win64\libmwservices.dll+01169029 sysq::getCondition+00002917
[ 31] 0x0000000002cde4b2 C:\Program Files\MATLAB\R2016b\bin\win64\libmwservices.dll+01172658 svWS_ProcessPendingEvents+00000162
[ 32] 0x00000000fd0b6b7d   C:\Program Files\MATLAB\R2016b\bin\win64\mcr.dll+00224125 mcr::runtime::setInterpreterThreadToCurrent+00026413
[ 33] 0x00000000fd0b726a   C:\Program Files\MATLAB\R2016b\bin\win64\mcr.dll+00225898 mcr::runtime::setInterpreterThreadToCurrent+00028186
[ 34] 0x00000000fd0ae385   C:\Program Files\MATLAB\R2016b\bin\win64\mcr.dll+00189317 mcr_process_events+00010293
[ 35] 0x00007ff931568364                   C:\windows\System32\KERNEL32.DLL+00033636 BaseThreadInitThunk+00000020
[ 36] 0x00007ff931aa70d1                      C:\windows\SYSTEM32\ntdll.dll+00422097 RtlUserThreadStart+00000033
If this problem is reproducible, please submit a Service Request via:
    http://www.mathworks.com/support/contact_us/
A technical support engineer might contact you with further information.
Thank you for your help.

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