Sophie: howto-html-en-20080722-2mdv2010.1 noarch

howto-html-en-20080722-2mdv2010.1.noarch.rpm

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CLASS="section"
><H1
CLASS="section"
><A
NAME="xmlrpc-howto-c"
>8. Using XML-RPC with C and C++</A
></H1
><P
>To get a copy of XML-RPC for C/C++, see the <A
HREF="http://xmlrpc-c.sourceforge.net"
TARGET="_top"
>xmlrpc-c website</A
>.</P
><P
>You can either download everything in RPM format, or you can
    build it from source.</P
><DIV
CLASS="section"
><H2
CLASS="section"
><A
NAME="xmlrpc-howto-c-client"
>8.1. A C Client</A
></H2
><P
>Save the following code in a file called
      <TT
CLASS="filename"
>getSumAndDifference.c</TT
>:</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="programlisting"
>#include &#60;stdio.h&#62;
#include &#60;xmlrpc.h&#62;
#include &#60;xmlrpc_client.h&#62;

#define NAME       "XML-RPC getSumAndDifference C Client"
#define VERSION    "0.1"
#define SERVER_URL "http://xmlrpc-c.sourceforge.net/api/sample.php"

void die_if_fault_occurred (xmlrpc_env *env)
{
    /* Check our error-handling environment for an XML-RPC fault. */
    if (env-&#62;fault_occurred) {
        fprintf(stderr, "XML-RPC Fault: %s (%d)\n",
                env-&#62;fault_string, env-&#62;fault_code);
        exit(1);
    }
}

int main (int argc, char** argv)
{
    xmlrpc_env env;
    xmlrpc_value *result;
    xmlrpc_int32 sum, difference;
    
    /* Start up our XML-RPC client library. */
    xmlrpc_client_init(XMLRPC_CLIENT_NO_FLAGS, NAME, VERSION);
    xmlrpc_env_init(&#38;env);

    /* Call our XML-RPC server. */
    result = xmlrpc_client_call(&#38;env, SERVER_URL,
                                "sample.sumAndDifference", "(ii)",
                                (xmlrpc_int32) 5,
                                (xmlrpc_int32) 3);
    die_if_fault_occurred(&#38;env);
    
    /* Parse our result value. */
    xmlrpc_parse_value(&#38;env, result, "{s:i,s:i,*}",
                       "sum", &#38;sum,
                       "difference", &#38;difference);
    die_if_fault_occurred(&#38;env);

    /* Print out our sum and difference. */
    printf("Sum: %d, Difference: %d\n", (int) sum, (int) difference);
    
    /* Dispose of our result value. */
    xmlrpc_DECREF(result);

    /* Shutdown our XML-RPC client library. */
    xmlrpc_env_clean(&#38;env);
    xmlrpc_client_cleanup();

    return 0;
}</PRE
></TD
></TR
></TABLE
><P
>To compile it, you can type:</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="programlisting"
>bash$ CLIENT_CFLAGS=`xmlrpc-c-config libwww-client --cflags`
bash$ CLIENT_LIBS=`xmlrpc-c-config libwww-client --libs`
bash$ gcc $CLIENT_CFLAGS -o getSumAndDifference getSumAndDifference.c $CLIENT_LIBS</PRE
></TD
></TR
></TABLE
><P
>You may need to replace <B
CLASS="command"
>gcc</B
> with the name of
      your system's C compiler.</P
></DIV
><DIV
CLASS="section"
><H2
CLASS="section"
><A
NAME="xmlrpc-howto-cc-client"
>8.2. A C++ Client</A
></H2
><P
>Save the following code in a file called
      <TT
CLASS="filename"
>getSumAndDifference2.cc</TT
>:</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="programlisting"
>#include &#60;iostream.h&#62;
#include &#60;XmlRpcCpp.h&#62;

#define NAME       "XML-RPC getSumAndDifference C++ Client"
#define VERSION    "0.1"
#define SERVER_URL "http://xmlrpc-c.sourceforge.net/api/sample.php"

static void get_sum_and_difference () {

    // Build our parameter array.
    XmlRpcValue param_array = XmlRpcValue::makeArray();
    param_array.arrayAppendItem(XmlRpcValue::makeInt(5));
    param_array.arrayAppendItem(XmlRpcValue::makeInt(3));

    // Create an object to resprent the server, and make our call.
    XmlRpcClient server (SERVER_URL);
    XmlRpcValue result = server.call("sample.sumAndDifference", param_array);

    // Extract the sum and difference from our struct.
    XmlRpcValue::int32 sum = result.structGetValue("sum").getInt();
    XmlRpcValue::int32 diff = result.structGetValue("difference").getInt();
        
    cout &#60;&#60; "Sum: " &#60;&#60; sum &#60;&#60; ", Difference: " &#60;&#60; diff &#60;&#60; endl;
}

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

    // Start up our client library.
    XmlRpcClient::Initialize(NAME, VERSION);

    // Call our client routine, and watch out for faults.
    try {
        get_sum_and_difference();
    } catch (XmlRpcFault&#38; fault) {
        cerr &#60;&#60; argv[0] &#60;&#60; ": XML-RPC fault #" &#60;&#60; fault.getFaultCode()
             &#60;&#60; ": " &#60;&#60; fault.getFaultString() &#60;&#60; endl;
        XmlRpcClient::Terminate();
        exit(1);
    }

    // Shut down our client library.
    XmlRpcClient::Terminate();
    return 0;
}</PRE
></TD
></TR
></TABLE
><P
>To compile it, you can type:</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="programlisting"
>bash$ CLIENT_CFLAGS=`xmlrpc-c-config c++ libwww-client --cflags`
bash$ CLIENT_LIBS=`xmlrpc-c-config c++ libwww-client --libs`
bash$ c++ $CLIENT_CFLAGS -o getSumAndDifference2 getSumAndDifference2.cc $CLIENT_LIBS</PRE
></TD
></TR
></TABLE
><P
>You'll need a reasonably modern C++ compiler for this to
      work.</P
></DIV
><DIV
CLASS="section"
><H2
CLASS="section"
><A
NAME="xmlrpc-howto-cc-proxy"
>8.3. A C++ Client with Proxy Classes</A
></H2
><P
>If your XML-RPC server supports the <A
HREF="xmlrpc-howto-interfaces.html#xmlrpc-howto-api-introspection"
>Introspection API</A
>,
      you can automatically generate C++ proxy classes for it.  To generate
      a proxy class, type the following command and save the output to a
      file:</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="programlisting"
>bash$ xml-rpc-api2cpp \
&#62; http://xmlrpc-c.sourceforge.net/api/sample.php sample SampleProxy</PRE
></TD
></TR
></TABLE
><P
>This will generate a proxy class named
      <TT
CLASS="literal"
>SampleProxy</TT
> containing wrappers for all the
      methods beginning with <TT
CLASS="literal"
>sample</TT
>. You can edit this
      class in any fashion you'd like.</P
></DIV
><DIV
CLASS="section"
><H2
CLASS="section"
><A
NAME="xmlrpc-howto-c-cgi"
>8.4. A CGI-Based C Server</A
></H2
><P
>Save the following code in a file called
      <TT
CLASS="filename"
>sumAndDifference.c</TT
>:</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="programlisting"
>#include &#60;xmlrpc.h&#62;
#include &#60;xmlrpc_cgi.h&#62;

xmlrpc_value *
sumAndDifference (xmlrpc_env *env, xmlrpc_value *param_array, void *user_data)
{
    xmlrpc_int32 x, y;

    /* Parse our argument array. */
    xmlrpc_parse_value(env, param_array, "(ii)", &#38;x, &#38;y);
    if (env-&#62;fault_occurred)
        return NULL;

    /* Return our result. */
    return xmlrpc_build_value(env, "{s:i,s:i}",
                              "sum", x + y,
                              "difference", x - y);
}

int main (int argc, char **argv)
{
    /* Set up our CGI library. */
    xmlrpc_cgi_init(XMLRPC_CGI_NO_FLAGS);

    /* Install our only method (with a method signature and a help string). */
    xmlrpc_cgi_add_method_w_doc("sample.sumAndDifference",
                                &#38;sumAndDifference, NULL,
                                "S:ii", "Add and subtract two integers.");

    /* Call the appropriate method. */
    xmlrpc_cgi_process_call();

    /* Clean up our CGI library. */
    xmlrpc_cgi_cleanup();
}</PRE
></TD
></TR
></TABLE
><P
>To compile it, you can type:</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="programlisting"
>bash$ CGI_CFLAGS=`xmlrpc-c-config cgi-server --cflags`
bash$ CGI_LIBS=`xmlrpc-c-config cgi-server --libs`
bash$ gcc $CGI_CFLAGS -o sumAndDifference.cgi sumAndDifference.c $CGI_LIBS</PRE
></TD
></TR
></TABLE
><P
>Once this is done, copy
      <TT
CLASS="filename"
>sumAndDifference.cgi</TT
> into your webserver's
      <TT
CLASS="filename"
>cgi-bin</TT
> directory.</P
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