Hi, I am building a system that calls a PERL callback from C code (DLL).

The PERL callback should get a HASH as one of its parameters.

How should it be done? I know how to pass integers/strings/etc. on the PERL stack, but I don't know how the HASH should be built on the stack.

Thanks for your knowledge :)

Itamar

P.S. Bellow is the C code sample where I push all the data to the PERL stack as integers and then call the PERL callback. In this case, the PERL callback parameter is a list.

C Code:
-------
    dSP;
    ENTER;
    SAVETMPS;
    PUSHMARK(SP);
    
    XPUSHs(sv_2mortal(newSViv((unsigned int)cbCtx)));

    for ( int i = 0; i < PACKET_SIZE; i++ )
    {
        XPUSHs(sv_2mortal(newSViv((unsigned int)packet[i])));
    }

    PUTBACK;
    call_pv( perlCbFuncName, G_SCALAR );
    retVal = POPi;
    SPAGAIN;
    PUTBACK;
    FREETMPS;
    LEAVE;


PERL Sample Code (prints the input params):
-------------------------------------------
sub test_perl_cb {
    my ( $ctx, @arrRespParams ) = @_;
    
    printf ( "Context: 0x%X\n", $ctx );

    foreach $item ( @arrRespParams )
    {
    printf ( "0x%X\n", $item );
    }
    
    return 1;
}

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In reply to Calling PERL from C code - How to "build" a hash on the PERL stack before calling the function? by itamarat

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