Thank you for your help, I moved the mapi_close_handle, but still don't get any results ...tokenizer.open("rdf");... ... if ((hdl=mapi_query(dbh, "tokenizer.locate(\"http://uri\")"))==NULL || mapi_error(dbh)!=MOK) die(dbh, hdl); while (mapi_fetch_row(hdl)) result=mapi_fetch_field(hdl, 0); if (mapi_close_handle(hdl) != MOK) die(dbh, hdl); ... ...tokenizer.close();... Kind regards, Petros 2010/5/18 Sjoerd Mullender <sjoerd@acm.org>:

At the very least, move the call to mapi_close_handle to *after* you're done with the handle.  The call frees up all resources on the client having to do with the handle, so the handle can't be used afterwards anymore.

On 2010-05-18 22:24, Petros Tsialiamanis wrote:

...

Hello, I would like to get the oid of a stored uri using the Mapi library. The mal commands that need to be executed are:

tokenizer.open("rdf"); id := tokenizer.locate("http://uri"); io.print(); tokenizer.close();

I tried to run the following program

...tokenizer.open("rdf");... ... if ((hdl = mapi_query(dbh, "tokenizer.locate(\"http://uri\")")) == NULL || mapi_error(dbh) != MOK)       die(dbh, hdl); if (mapi_close_handle(hdl) != MOK)       die(dbh, hdl); while (mapi_fetch_row(hdl))       result=mapi_fetch_field(hdl, 0); ... ...tokenizer.close();...

.. but I get the following error Mapi.mx:5141: mapi_fetch_row: Assertion `(hdl)->mid' failed.

Could you tell me how can I solve this problem?

Kind regards, Petros

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