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I have problem when using mathlink, the source code is quite simple:

void MAXF(char* ex1, char* ex2, char** result){
   MLINK lp;
   int pkt;
   MLEnvironment env;
   env = MLInitialize(NULL);
   if (env == NULL) return;
   int argcs = 4;
   char *argvs[5] = {"-linkmode", "launch", "-linkname", "math -mathlink", NULL};
   lp = MLOpen(argcs, argvs);
   if (lp == NULL) return;

   *result = malloc(100);
   sprintf(*result, "0");

   MLPutFunction(lp, "Exit", 0L);
   MLClose(lp);
   MLDeinitialize(env);
}

and in main, i call it by:

char* test;
MAXF("0", "0", &test);

However, after running, the terminal always shows this line:

In[2]:=

I believe that there is a problem, but I can't figure it out. Please help.

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  • $\begingroup$ I'm using Mathematica 9. $\endgroup$
    – Loi.Luu
    Commented Oct 25, 2013 at 13:26

1 Answer 1

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On my system, which is Ubuntu Linux 12.04 (64bit), this does not happen. I used the following code, which extends your example into a SSCCE (Short, Self Contained, Correct (Compilable), Example). The C code can be found on pastebin and you might want to adapt the setting for "TargetDirectory" and "Libraries":

<< CCompilerDriver`
src = Import["http://pastebin.com/raw.php?i=WU6JYq25", "Text"];
prog = CreateExecutable[src, "out", "ShellCommandFunction" :> Print, 
  "ShellOutputFunction" :> Print, "Libraries" -> {"ML64i3"}, 
  "TargetDirectory" -> "/tmp"]

After starting the program in the terminal I get no output

patrick@lenerd:~/tmp$ ./out 
patrick@lenerd:~/tmp$
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  • $\begingroup$ I don't know why the error occurs in my system, even when I remove the two lines: *result = malloc(100); sprintf(*result, "0"); I use ubuntu 12.04 64 bit also. I compile by gcc -o main main.c -lML64i3 -lm -lpthread -lrt -lstdc++ $\endgroup$
    – Loi.Luu
    Commented Oct 26, 2013 at 10:00
  • $\begingroup$ @Loi.Luu When you try my code above, which uses the automatic compilation from within Mathematica, does the In[2]:= appear too? $\endgroup$
    – halirutan
    Commented Oct 26, 2013 at 13:39
  • $\begingroup$ Actually I'm not sure how to set the TargetDirectory and Libraries correctly. I paste your script into Mathematica console and nothing happens. $\endgroup$
    – Loi.Luu
    Commented Oct 26, 2013 at 18:13
  • $\begingroup$ I have edited the code block. Just copy it completely into a Mathematica notebook and evaluate it. After it prog contains the path to the built executable which you can start by simply calling it in a terminal. In my case (now here on OSX) it is /private/tmp/out, in your case it will be something different. Just copy the output to a terminal. $\endgroup$
    – halirutan
    Commented Oct 26, 2013 at 18:36
  • $\begingroup$ I still get this error, I mean the In[2]:= still appears.. $\endgroup$
    – Loi.Luu
    Commented Oct 26, 2013 at 20:01

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