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POConnect SAS to a C library
 

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  1. POConnect SAS to a C library
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    <p>This is related to calling C functions (made into dynamic libraries) from SAS. There are 4 files. the first 2 (1 c-file and 1 sas-file) are a positive control using doubles. The remaining files are the problematic.</p> <p>C-FILE-1 </p> <pre><code>#ifdef BUILD_DLL #define EXPORT __declspec(dllexport) #else #define EXPORT __declspec(dllimport) #endif #include "stdio.h" #include "stdlib.h" #include "string.h" EXPORT void test (double *inarray, double *outarray, int n) { int i; for (i=0; i&lt;n;i++) { outarray[i]= inarray[i]*2; } return; } </code></pre> <p>//gcc -c -DBUILD_DLL pointersVoid.c<br> //gcc -shared -o pointersVoid.dll pointersVoid.o </p> <p>SAS-FILE-1 </p> <pre><code>filename sascbtbl catalog 'work.api.MYFILE'; data _null_; file sascbtbl; input; put _infile_; cards4; routine test module=pointersVoid minarg=3 maxarg=3; arg 1 input num byvalue format=IB4.; arg 2 input num byvalue format=IB4.; arg 3 input num byvalue format=PIB4.; ;;;; run; data test; array arr(5) _temporary_ (7.56 2.356 63.54 5.14 8.2); array ret(5); rc=modulen ("*e","test",addr(arr(1)), addr(ret(1)), 5); run; </code></pre> <p>This works fine and ret array now contains the *2 of the original values. But when we use strings we get errors:</p> <p>C-FILE-2 </p> <pre><code>#include "stdio.h" #include "stdlib.h" #include "string.h" char *strtrim_right(char *p) { char *end; int len; len = strlen(p); while (*p &amp;&amp; len) { end = p + len-1; if(isalpha(*end)) *end = 0; else break; len = strlen(p); } return(p); } EXPORT char **test (char **x, char **y, int n) { int i; for (i = 0; i &lt; n; i++) { y[i] = strtrim_right(x[i]); } } /* gcc -c -DBUILD_DLL pointers-array-string-void.c gcc -shared -o pointers-array-string-void.dll pointers-array-string-void.o */ </code></pre> <p>SAS-FILE-2 </p> <pre><code>filename sascbtbl catalog 'work.api.MYFILE'; data _null_; file sascbtbl; input; put _infile_; cards4; routine test module=pointers-array-string-void minarg=3 maxarg=3; arg 1 input char byvalue format=$CSTR200. ; arg 2 input char byvalue format=$CSTR200. ; arg 3 input num byvalue format=PIB4. ; ;;;; run; data test; array arr(5) $ _temporary_ ('PM23RO' '85AB12RE' 'RE147AMF' 'TAGH14MMF' 'LCA2Q'); array ret(5) $; call module ("*e","test",addr(arr(1)), addr(ret(1)), 5); run; </code></pre> <p>This doesn't work and gives errors:</p> <pre><code>Unrecognized option - in ROUTINE statement NOTE: Invalid argument to function MODULE ret1= ret2= ret3= ret4= ret5= rc=. _ERROR_=1 _N_=1 </code></pre> <p>I know the C-FILE-2 works well because the dll has been tested from another aplication, so ther error source is very likely the SAS code in SAS-FILE-2. Any suggestions to make it work?</p>
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    1. USfrancogrex
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      1. POConnect SAS to a C library
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    1. COJust out of curiosity - Do you have a specific need to call your own string trim function? SAS already has about a dozen different functions that can be used to trim strings such as: cat, catq, cats, catt, catx, compress, trim, trimn, etc... perhaps there is a relatively simple function call or combination that could achieve the same result. Also, try asking on runsubmit.com - another site like StackOverflow dedicated to SAS. Cheers, Rob
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      1. POConnect SAS to a C library
      1. USRobert Penridge
    2. COThe example I gave was just a toy example (I know for this particular case it could be done within SAS only) but the aim is to test and make the connection between SAS and C -using module- work optimally (with arrays of strings).
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      1. USfrancogrex
    3. COThis is probably futile, but have you tried renaming the library so the name doesn't contain any dashes?
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      1. POConnect SAS to a C library
      1. USVille Koskinen
 

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