Segmentation violation on integrating an C function using Legacy Code Tool

Hello,

i need to call a dynamic link library in simulink. To do that i wrote a c function for calling the dll and I'm using LCT for creating an simulink block. Everything works fine until i start the simulation with my created simulink block. Following error occurs:

 ------------------------------------------------------------------------
       Segmentation violation detected at Tue May 24 14:28:01 2016
------------------------------------------------------------------------ 
Configuration:
  MATLAB Version:   7.4.0.287 (R2007a)
  MATLAB License:   236337
  Operating System: Microsoft Windows XP
  Window System:    Version 5.1 (Build 2600: Service Pack 3)
  Processor ID:     x86 Family 6 Model 15 Stepping 2, GenuineIntel
  Virtual Machine:  Java 1.5.0_07 with Sun Microsystems Inc. Java HotSpot(TM) Client VM mixed mode
  Default Charset:  windows-1252
Register State:
  EAX = 00000000  EBX = 41e00000
  ECX = 16a03280  EDX = 17188a50
  ESI = 17188e70  EDI = 15848590
  EBP = 00ceb0f0  ESP = 00ceb018
  EIP = 7a7fbde9  FLG = 00010206
Stack Trace:
  [0] libmwsimulink.dll:struct slErrMsgQueue * __cdecl CMexSFcnOutputFcn(struct slSFcnInfo *)(0x15848590, 0x16a02f40, 0x17188e70, 0x16a45020) + 1417 bytes
  [1] libmwsimulink.dll:struct slErrMsgQueue * __cdecl SFcnOutputFcn(class slBlock *,class slSimBlock_tag *)(0x01a02f40, 0x12feef00, 0x00ceb180 "°±Î", 0x7a4df976) + 315 bytes
  [2] libmwsimulink.dll:public: virtual struct slErrMsgQueue * __thiscall LegacyDirectRunTimeDispatcher::Output(class slSimBlock_tag *)(0x12feef00, 0, 0x16a45020, 0x18618210) + 16 bytes
  [3] libmwsimulink.dll:struct slErrMsgQueue * __cdecl ExecSTaskOutputList(class slModel *,struct bdCompInfo_tag *,struct bdExecInfo_tag *)(0x16a45020, 0x18618210, 0x15848d60, 0x16a45020) + 438 bytes
  [4] libmwsimulink.dll:struct slErrMsgQueue * __cdecl BdSystemOutput(class slModel *,struct bdCompInfo_tag *,struct bdExecInfo_tag *)(0x00a45020, 0x18618210, 0x15848d60, 0x16a45020) + 287 bytes
  [5] libmwsimulink.dll:public: virtual struct slErrMsgQueue * __thiscall SlNormalModelFcns::outputFcn(class slModel *)(0x00a45020, 0x16a45020, 0, 0x17188a50) + 103 bytes
  [6] libmwsimulink.dll:struct slErrMsgQueue * __cdecl ModelOutput(class slModel *)(0x00a45020, 0xc34f5893, 0x17188a50, 0x16a45020) + 320 bytes
  [7] libmwsimulink.dll:struct slErrMsgQueue * __cdecl slDoOutputAndUpdate(class slModel *)(0x00a45020, 0x00ceb294, 0, 0) + 682 bytes
  [8] libmwsimulink.dll:struct slErrMsgQueue * __cdecl StepMenuSim(struct slBlockDiagram_tag *)(0x008937d0, 0, 0x168937d0, 0x00ceb298 "Ô²Î") + 223 bytes
  [9] libmwsimulink.dll:struct slErrMsgQueue * __cdecl sleModelExecutionInterface(struct slBlockDiagram_tag *,enum slEngineCmdOption,enum ECStatus *)(0x168937d0, 5, 0x00ceb294, 0x1695bbe4) + 146 bytes
  [10] libmwsimulink.dll:void __cdecl sluiWorkProcSimStep(void *)(0x168937d0, 0x7c80934a, 0x00632c0f, 0x791d01ef) + 27 bytes
  [11] uiw.dll:void __cdecl UIW_CallWorkProcs(void)(0x00ceb2f0, 0x7921d501, 0, 0x7921d508) + 42 bytes
  [12] uiw.dll:char * __cdecl getCommand(char *,int)(0x7a032920, 4096, 0x00ceb380, 0x7a024229) + 98 bytes
  [13] uiw.dll:public: virtual char * __thiscall uiw::UIW_IOProxy::getCmdWindowCommand(char *,int)const (0x7a032920, 4096, 0xfb306720, 0x00ceb3f0) + 16 bytes
  [14] bridge.dll:char * __cdecl win32IoReadLine(bool,struct _iobuf *,char *,char *,int,bool *)(0x781c1b70, 0x120abb20, 4096, 0x00ceb3c3) + 185 bytes
  [15] bridge.dll:char * __cdecl ioReadLine(bool,struct _iobuf *,char *,char *,int,bool *)(0, 0x781c1b70, 0x120abb20, 0x120abb20) + 24 bytes
  [16] bridge.dll:void __cdecl mnGetFullLine(char * *,unsigned int *,unsigned int *,bool)(0x00ceb3ec, 0x00ceb3e4, 0, 0x7848c6b0) + 91 bytes
  [17] bridge.dll:_mnGetCommandLineBuffer(0, 0xfb302024, 0x01801718, 0x018016b8) + 131 bytes
  [18] bridge.dll:__catch$_mnParser$0(0xfb33fec0, 0x018016b8, 0x018016b8, 0) + 144 bytes
  [19] mcr.dll:public: void __thiscall mcrInstance::mnParser(void)(0xfb33f5cc, 0x004074a4, 336704, 0) + 62 bytes
  [20] MATLAB.exe:0x004021b8(4194304, 0, 336704, 10)
  [21] MATLAB.exe:0x00403bd2(1109972, 0, 0x7ffd5000, 0)
  [22] kernel32.dll:0x7c816037(0x00403daf, 0, 0x78746341, 32)
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  -------------------------------------------------------------
  This segmentation violation occurred while executing the 
  S-function 'call_dll' in block 'untitled/call_dll'.
  A common cause of this segmentation violation is an incorrect
  input port direct feedthrough setting. Each input port of the
  S-function that is read (accessed) in mdlOutputs and/or
  mdlGetTimeOfNextVarHit must specify that it needs its input
  signal in these routines by setting direct feedthrough for
  these input ports.
  1) To debug your C-MEX S-function, you can enable diagnostics
     by compiling the S-function source with the -g flag, e.g.,
        mex -g sfunction_name.c
  2) You can ask Simulink to try assuming your S-function has
     direct feedthrough using:
        set_param('modelname','TryForcingSFcnDF','on')
     If Simulink can find a valid sorting mode that does not
     result in algebraic loops involving your S-function, your
     model will execute (assuming that the cause of this
     segmentation violation is an incorrect direct feedthrough
     setting on an input port).
  See matlabroot/simulink/src/sfuntmpl_directfeed.txt
  -------------------------------------------------------------

Here my c function:

    #include "windows.h"
#include "simstruc.h"
#include "m5.h"
#include "stdio.h" 
double open_device(double u)
{
typedef UINT (CALLBACK* LPFNDLLFUNC1)(DWORD,CHAR*);
double y=0;
HINSTANCE hDLL;               // Handle to DLL
LPFNDLLFUNC1 lpfnDllFunc1;    // Function pointer
char uParam2[]="Init_String";
hDLL = LoadLibrary("m5apiw32.dll");
if (hDLL != NULL)
{
   lpfnDllFunc1 = (LPFNDLLFUNC1)GetProcAddress(hDLL,"PCube_getModulesIdMap");
   if (!lpfnDllFunc1)
   {
      // handle the error
      FreeLibrary(hDLL);
   }
   else
   {
      // call the function        
    y = lpfnDllFunc1(u, uParam2);
    return y;
   }
}
}

and my LCT options:

 def = legacy_code('initialize');
def.SourceFiles = {'lct.c'};
def.OutputFcnSpec = 'double y1 = open_device(double u1)';
def.SFunctionName = 'call_dll';
legacy_code('sfcn_cmex_generate', def);
legacy_code('sfcn_tlc_generate', def);
legacy_code('compile', def);
legacy_code('slblock_generate', def);

Best Regards and thanks for the help

Thomas

Answer 1

[jiayu tu]

I had the same problem, did you solve it?