Invoke web service to return binary file (image) using soap

Question

Dear all,
Please I a problem when invoking a web service throgh soap protocol,
this we service has two operations, the first one takes student id and return doctype of it's documents id's,
the another operation takes the document id and return it's image ( this is like archiving system)
NOTE:
I use soap package from this link:
[http://www.oracle-base.com/dba/miscellaneous/soap_api.sql|http://www.oracle-base.com/dba/miscellaneous/soap_api.sql]
Also I tried to invoke the following web service but failed:
[http://www.webservicex.net/WS/WSDetails.aspx?CATID=12&WSID=56]
CREATE OR REPLACE PACKAGE BODY pkg_my_webservice IS
vg_funciton_fnc VARCHAR2(256):='GetCitiesByCountry';
vg_ws_address VARCHAR2(255):='http://www.webservicex.net/globalweather.asmx';
FUNCTION call_myfunction(vp_parameter1 VARCHAR2,vp_parameter2 VARCHAR2)
RETURN VARCHAR2 AS
ol_req soap_api.t_request;
ol_resp soap_api.t_response;
BEGIN
ol_req:=soap_api.new_request(vg_funciton_fnc,'xmlns="'||vg_ws_address||'"');
soap_api.add_parameter(ol_req,'string1','partns:string',vp_parameter1);
soap_api.add_parameter(ol_req,'string2','partns:string',vp_parameter1);
ol_resp:=soap_api.invoke(ol_req,vg_ws_address,vg_funciton_fnc);
RETURN soap_api.get_return_value(ol_resp,'result','xmlns:m="'||vg_ws_address||'"');
END call_myfunction;
END pkg_my_webservice;
Please can any one tell me how to invoke this web service to achive this ?
Thanks in advance

Answer 1

I don't see a version number.
I don't see any indication as to where the code you posted originated.
I don't see any indication of whether it works or does not work (for example an error message).
If you have questions about web services ask them in the correct forum.
If you want someone to teach you how to use them all I can tell you is that the developers where I work use lots of SOAP and not one has written a procedure similar to what you posted.