I was stuck on a similar sort of problem recently, and it took a while to figure out what to do. After much re-reading of: "perldoc (perlembed, perlcall, perlguts, perlapi)" and some trial and error coding (time-wasting), I came up with something that looks like the following code, which I hope will save you some time (there are probably some problems in it but the gist of it should be helpful): 
int getStringFromPerlSubroutine(PerlInterpreter* perlInterpreter, char
+* packageExplicitSubName, SV** string)
{
        PERL_SET_CONTEXT(perlInterpreter);
        dSP;                                    // Initialize local st
+ack pointer everything created after here.
        ENTER;
        SAVETMPS;                               // This is a temporary
+ variable.
        PUSHMARK(SP);                           // Remember the stack 
+pointer.
        PUTBACK;                                // Make local the stac
+k pointer global.

        if (call_pv(packageExplicitSubName, G_SCALAR | G_NOARGS | G_EV
+AL) == 0) {
                // TODO: Interpret return value for success.
                //fprintf(stderr, "Error: call_pv did not return 1 as 
+it should have. \n");
                //return 1;
        }
        SPAGAIN;                                // Refresh the stack p
+ointer.

        // Check there were no problems in the subroutine.
        if (SvTRUE(ERRSV)) {
                STRLEN n_a;
                fprintf(stderr, "Error: getSvPV %s. \n", SvPV(ERRSV, n
+_a));
                POPs;
                return 1;
        }

        STRLEN n_a;
        SV* stringRV = newRV_inc(POPs);

        // Check returned SV is a reference.
        if (!SvROK(stringRV)) {
                fprintf(stderr, "Error: getSvPV could not get a refere
+nce to the SVt_PV expected to be returned by the Perl subroutine. \n"
+);
                return 1;
        }
        // Check the type of the reference
        if (SvTYPE(SvRV(stringRV)) != SVt_PV) {
                fprintf(stderr, "Error: getSvPV was not returned a ref
+erence to an SVt_PV from the Perl subroutine as expected. (Actual enu
+m: %d) \n",
                                SvTYPE(SvRV(stringRV)) );
                return 1;
        }

        *string = SvRV(stringRV);

        //printf("%s \n", SvPV(tempPV, n_a));
        //*string = SV* stringSV = newSVpx(POPpx, n_a);
        //printf("Inside  %s \n", SvPV(*string, n_a));
        //(*string->sv_refcnt)++;

        PUTBACK;
        FREETMPS;                               // Free that return va
+lue.
        LEAVE;                                  // Free the XPUSHed "m
+ortal" args.

        return 0;
}


int main()
{
 PerlInterpreter *perlInterpreter;

 //Init perlInt...

 STRLEN len;
 SV* string = newSV(sizeof(SV*));
 getStringFromPerlSubroutine(perlInterpreter, "TestPackage::getString"
+, &string);
 printf("%s \n", SvPV(string, len));
 printf("Length of returned string: %d", len);
 SvREFCNT_dec(string);

 // Cleanup perlInt...

 return 0;
}

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In reply to Re^2: how can i get char * from SV* by seank
in thread how can i get char * from SV* by anilkumar

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