c pass string parameter with rpcgen

Hi,

I am wanting to create a basic c program using RPCGEN on the hello.x file below. How do I write my client file to pass the string parameter of print_hello to the server? I can easily pass a void parameter and return a string but not sure how to pass the string.

Cheers

---------- hello.x -------------------
 
program DISPLAY_PRG {
	version DISPLAY_VER {
		string print_hello( string ) = 1;
	} = 1;
} = 0x20000001;
 
 
----------- hello_client.c ---------------
/*
	The CLIENT program: hello_client.c
	This will be the client code executed by the local client process.
*/
#include <stdio.h>
#include "hello.h"	/* Generated by rpcgen from hello.x	*/
 
int main(int argc, char *argv[]) {
	CLIENT	*client;
	char* *return_value;
	int		filler;
	char	*server;
	/*
		We must specify a host on which to run. We will get the host name
		from the command line as argument 1.
	*/
 
	if (argc != 2) {
		fprintf(stderr, "Usage: %s host_name\n", *argv);
		exit(1);
	}
	server = argv[1];
	
	/*
		Generate the client handle to call the server
	*/
	if ((client=clnt_create(server,		DISPLAY_PRG,
							 DISPLAY_VER, "tcp")) == (CLIENT *) NULL) {
		clnt_pcreateerror(server);
		exit(2);						 
	}
	printf("client : Calling function.\n");
	return_value = print_hello_1((void *) &filler, client);
	if (*return_value) {
		printf("server returned message : %s\n", *return_value);
		printf("client : Mission accomplished.\n");
	} else {
		printf("client : Unable to display message.\n");
	}
	return 0;
}

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