XML-RPC for C/C++ (Xmlrpc-c) Code

/* A simple synchronous XML-RPC client written in C, as an example of
   an Xmlrpc-c client.  This invokes the sample.add procedure that the
   Xmlrpc-c example server.c server provides.  I.e. it adds to numbers
   together, the hard way.
*/

#include <stdlib.h>
#include <stdio.h>

#include <xmlrpc-c/base.h>
#include <xmlrpc-c/client.h>

#include "config.h"  /* information about this build environment */

#define NAME "Xmlrpc-c Test Client"
#define VERSION "1.0"

static void 
die_if_fault_occurred (xmlrpc_env * const envP) {
    if (envP->fault_occurred) {
        fprintf(stderr, "XML-RPC Fault: %s (%d)\n",
                envP->fault_string, envP->fault_code);
        exit(1);
    }
}



int 
main(int           const argc, 
     const char ** const argv ATTR_UNUSED) {

    xmlrpc_env env;
    xmlrpc_value * resultP;
    xmlrpc_int32 sum;
    const char * const serverUrl = "http://localhost:8080/RPC2";
    const char * const methodName = "sample.add";

    if (argc-1 > 0) {
        fprintf(stderr, "This program has no arguments\n");
        exit(1);
    }

    /* Initialize our error-handling environment. */
    xmlrpc_env_init(&env);

    /* Start up our XML-RPC client library. */
    xmlrpc_client_init2(&env, XMLRPC_CLIENT_NO_FLAGS, NAME, VERSION, NULL, 0);
    die_if_fault_occurred(&env);

    printf("Making XMLRPC call to server url '%s' method '%s' "
           "to request the sum "
           "of 5 and 7...\n", serverUrl, methodName);

    /* Make the remote procedure call */
    resultP = xmlrpc_client_call(&env, serverUrl, methodName,
                                 "(ii)", (xmlrpc_int32) 5, (xmlrpc_int32) 7);
    die_if_fault_occurred(&env);
    
    /* Get our sum and print it out. */
    xmlrpc_read_int(&env, resultP, &sum);
    die_if_fault_occurred(&env);
    printf("The sum is %d\n", sum);
    
    /* Dispose of our result value. */
    xmlrpc_DECREF(resultP);

    /* Clean up our error-handling environment. */
    xmlrpc_env_clean(&env);
    
    /* Shutdown our XML-RPC client library. */
    xmlrpc_client_cleanup();

    return 0;
}