#include #include #include #include "mongoose.h" static int static_value = 123; // Exposed and changeable via the form static void print_html_form(struct mg_connection *conn) { mg_send_header(conn, "Content-Type", "text/html"); mg_send_header(conn, "Cache-Control", "max-age=0, post-check=0, " "pre-check=0, no-store, no-cache, must-revalidate"); // Note that all the following normally should reside in static HTML page mg_printf_data(conn, "%s", ""); // It is better to use local copy though mg_printf_data(conn, "", "http://code.jquery.com/jquery-1.11.0.min.js"); mg_printf_data(conn, "%s", ""); mg_printf_data(conn, "%s", ""); mg_printf_data(conn, "%s", "

Ajax form submission example

"); mg_printf_data(conn, "%s", ""); mg_printf_data(conn, "%s", ""); } static int ev_handler(struct mg_connection *conn, enum mg_event ev) { if (ev == MG_REQUEST) { if (strcmp(conn->uri, "/get_value") == 0) { mg_printf_data(conn, "{\"value\": %d}", static_value); } else if (strcmp(conn->uri, "/set_value") == 0) { // This Ajax endpoint sets the new value for the device variable char buf[100] = ""; mg_get_var(conn, "new_value", buf, sizeof(buf)); // Get form variable static_value = atoi(buf); // Set new value mg_printf_data(conn, "%s", "{\"success\": true}"); printf("Setting value to [%d]\n", static_value); // Debug trace } else { // Better way is to set "document_root" option, put "index.html" file // into document_root and return MG_FALSE here. We're printing HTML // page by hands just to keep everything in one C file. print_html_form(conn); } return MG_TRUE; } else if (ev == MG_AUTH) { return MG_TRUE; } return MG_FALSE; } int main(void) { struct mg_server *server; // Create and configure the server server = mg_create_server(NULL, ev_handler); mg_set_option(server, "listening_port", "8000"); // Serve request. Hit Ctrl-C to terminate the program printf("Starting on port %s\n", mg_get_option(server, "listening_port")); for (;;) { mg_poll_server(server, 1000); } // Cleanup, and free server instance mg_destroy_server(&server); return 0; }