Step 1: Use the I4GL function and the I4GL.4cf configuration file

The I4GL .4cf configuration file has all the information you need about the I4GL Web service.

For example, the I4GL zipcode demo has the following .4cf configuration file:

[SERVICE]
	TYPE               = publisher
	INFORMIXDIR        = /dbs/32bits/ifx/11.70.uc2
	DATABASE           = i4glsoa
	CLIENT_LOCALE      = en_US.8859-1
	DB_LOCALE          = en_US.8859-1
	INFORMIXSERVER     = ol_moscou1170uc2
	HOSTNAME           = moscou.strasbourg.4js.com
	PORTNO             = 9876
	I4GLVERSION        = 7.50.xC4
	WSHOME             = /dbs/32bits/ifx/11.70.uc2/AXIS2C
	WSVERSION          = AXIS1.5
	TMPDIR             = /tmp/zipcodedemo
	SERVICENAME        = ws_zipcode
	[FUNCTION]
		NAME           = zipcode_details
		[INPUT]
			[VARIABLE]NAME = pin TYPE = CHAR(10)[END-VARIABLE]
		[END-INPUT]
		[OUTPUT]
			[VARIABLE]NAME = city TYPE = CHAR(100)[END-VARIABLE]
			[VARIABLE]NAME = state TYPE = CHAR(100)[END-VARIABLE]
		[END-OUTPUT]
	[END-FUNCTION]
	[DIRECTORY]
		NAME           = /home/f4gl/fg/i4gl
		FILE           = soademo.4gl,
	[END-DIRECTORY]
[END-SERVICE]

Then simply copy your I4GL function without any modification into a new Genero file and add the Genero IMPORT com instruction at the beginning of the file.

For example, the I4GL SOA demo contains the zipcode_details service (soademo.4gl)

IMPORT com

FUNCTION zipcode_details(pin)
		DEFINE state_rec RECORD
				     pin CHAR(10),
				     city CHAR(100),
				     state CHAR(100)
			    END RECORD,
			    pin CHAR(10),
			    sel_stmt CHAR(512);

		LET sel_stmt= "SELECT * FROM statedetails WHERE pin = ?";
		PREPARE st_id FROM sel_stmt;
		DECLARE cur_id CURSOR FOR st_id;
		OPEN cur_id USING pin;
		FETCH cur_id INTO state_rec.*;
		CLOSE cur_id;
		FREE cur_id;
		FREE st_id;
		RETURN state_rec.city, state_rec.state
		
END FUNCTION

You may need to make some minor code modification for compatibility.