jPOS.org

Despite the fact that our Java version is more powerful and convenient for many users, we have received quite a lot of inquires for a lightweight C version (mainly for embedded devices).

So we've developed a little C library capable of packing and unpacking ISO-8583 messages. What you get is just three files written in ANSI C called "iso8583.c", "iso8583.h" and "demo.c" with basically the following functions:

    void isomsg_init   (isomsg *m);
    int  isomsg_pack   (isomsg *m, iso_packager *p, void *packbuf);
    int  isomsg_unpack (isomsg *m, iso_packager *p, void *packbuf, int len);
    void isomsg_dump   (FILE *fp, isomsg *m);
    void isomsg_free   (isomsg *m);
  

Here is a sample demo.c:

    int main (int argc, char **argv) {
        int len;
        isomsg m, r;
        char buf[1024];

        isomsg_init (&m);
        m.fld[0]  = "0800";
        m.fld[2]  = "454000000000003";
        m.fld[3]  = "000000";
        m.fld[28] = "C1200";
        m.fld[11] = "000001";
        m.fld[34] = "12345";
        m.fld[41] = "12345678";
        m.fld[70] = "301";

        isomsg_dump (stdout, &m);
        len = isomsg_pack (&m, iso87packager, buf);
        dumpbuf (stdout, buf, len);
        len = isomsg_unpack (&r, iso87packager, buf, len);

        isomsg_dump (stdout, &r);
        isomsg_free (&r);

        return 0;
    }
  

and here is the output:

   <isomsg>
    <field id="0" value="0800"/>
    <field id="2" value="454000000000003"/>
    <field id="3" value="000000"/>
    <field id="11" value="000001"/>
    <field id="28" value="C1200"/>
    <field id="34" value="12345"/>
    <field id="41" value="12345678"/>
    <field id="70" value="301"/>
   </isomsg>
   <dump length="54"/>
    08 00 E0 20 00 10 40 80 00 00 04 00 00 00 00 00
    00 00 15 45 40 00 00 00 00 00 30 00 00 00 00 00
    01 43 00 00 12 00 05 31 32 33 34 35 31 32 33 34
    35 36 37 38 03 01
   </dump>
   <isomsg>
    <field id="0" value="0800"/>
    <field id="2" value="454000000000003"/>
    <field id="3" value="000000"/>
    <field id="11" value="000001"/>
    <field id="28" value="C00001200"/>
    <field id="34" value="12345"/>
    <field id="41" value="12345678"/>
    <field id="70" value="301"/>
   </isomsg>
  

So the point is that our C code is just able to pack and unpack ISO-8583 messages, you doesn't get all the bells and whistles offered by jPOS, the open source version.

We want to make sure you understand that what you'll get is just three files (iso8583.c, iso8583.h and demo.c). That's quite little code, compared to jPOS, but if you want to deal with ISO-8583 messages from C language we guess that's all you need.

The package will be delivered as an e-mail attachment to the address you enter in the order form. The delivery is performed manually after receipt of an order and is therefore associated with a short delay (typically 12 to 24 hours). Do not hesitate to contact us for further information.