C Examples -- Example 1: nshello

### Example 1: nshello

The following example provides a single request function which handles the /helloworld URL, returning 'Hello'. This module is the simplest of the AOLserver example modules.

This example can be found in the `examples/c/nshello` directory.

        #include "ns.h"
        /*
         * This is the simplest possible example of adding a C module
         * to the AOLserver.
         */

        /*
         * The Ns_ModuleVersion exported integer is used to verify
         * this module version when loaded.  For AOLserver 2.0,
         * 1 (one) is the only valid value for this variable.
         */
        int Ns_ModuleVersion = 1;

        static Ns_OpProc Hello;

        /*
         * The Ns_ModuleInit function is the function the AOLserver
         * will call each time the module is loaded into a
         * server.  The function is passed two parameters:
         *
         * hServer:   The server `handle' as a string. This is the
         *            short name given to the virutal server such
         *            as `server1'.
         *
         * hModule:   The module `handle' as a string. This is the
         *            short name given to the module such as `hello'
         *
         * For example, if this module is known as `hello' and loaded
         * into the `server1' server with entries similar to the following
         * in the nsd.ini file:
         *
         * [ns\servers]
         * server1=My First Server
         *
         * [ns\server1\modules]
         * hello=hello.dll    ; or hello.so on Unix platforms
         *
         * This function would be called with "server1" and "hello" as
         * its arguments.
         *
         */
        int
        Ns_ModuleInit(char *hServer, char *hModule)
        {
            Ns_RegisterRequest(hServer, "GET", "/helloworld", Hello,
        					NULL, NULL, 0);
            return NS_OK;
        }

        static int
        Hello(Ns_OpContext context, Ns_Conn *conn)
        {
            char html[]="<HTML><BODY>Hello World.</BODY></HTML>";
            Ns_ConnReturnHtml(conn, 200, html, strlen(html));
            return NS_OK;
        }

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