main.cpp

00001 #include "mbed.h"
00002 
00003 #include "EthernetNetIf.h"
00004 #include "HTTPClient.h"
00005 
00006 #include "spdomparser.hpp"
00007 #include "spxmlnode.hpp"
00008 #include "spxmlhandle.hpp"
00009 
00010 EthernetNetIf eth;
00011 HTTPClient http;
00012 
00013 HTTPResult result;
00014 bool completed = false;
00015 void request_callback(HTTPResult r) {
00016     result = r;
00017     completed = true;
00018 }
00019 
00020 void parseWeather(SP_XmlElementNode *node) {
00021     SP_XmlHandle handle(node);
00022     SP_XmlElementNode * tempc = handle.getChild( "temp_c" ).toElement();
00023     if (tempc) {
00024         printf("current temp=%sC\n",tempc->getAttrValue("data"));
00025     }
00026     SP_XmlElementNode * tempf = handle.getChild( "temp_f" ).toElement();
00027     if (tempf) {
00028         printf("current temp=%sF\n",tempf->getAttrValue("data"));
00029     }
00030 }
00031 
00032 int main() {
00033     // the eth and HTTP code has be taken directly from the HTTPStream documentation page
00034     // see http://mbed.org/cookbook/HTTP-Client-Data-Containers
00035 
00036     printf("setup\n");
00037     EthernetErr ethErr = eth.setup();
00038     if (ethErr) {
00039         printf("Error in setup\n");
00040         return -1;
00041     }
00042     printf("setup ok\n");
00043 
00044     SP_XmlDomParser parser;
00045 
00046     HTTPStream stream;
00047 
00048     char BigBuf[512 + 1] = {0};
00049     stream.readNext((byte*)BigBuf, 512); //Point to buffer for the first read
00050 
00051     HTTPResult r = http.get("http://www.google.com/ig/api?weather=Los+Angeles", &stream, request_callback);
00052 
00053     while (!completed) {
00054         Net::poll(); //Polls the Networking stack
00055         if (stream.readable()) {
00056             BigBuf[stream.readLen()] = 0; //Transform this buffer in a zero-terminated char* string
00057             
00058             parser.append( BigBuf, strlen(BigBuf)); // stream current buffer data to the XML parser
00059             
00060             stream.readNext((byte*)BigBuf, 512); //Buffer has been read, now we can put more data in it
00061         }
00062     }
00063     if (result == HTTP_OK) {
00064         printf("Read completely\n");
00065     } else {
00066         printf("Error %d\n", result);
00067         return -1;
00068     }
00069 
00070     SP_XmlHandle rootHandle( parser.getDocument()->getRootElement() );
00071     SP_XmlElementNode * child2 = rootHandle.getChild( "weather" )
00072                                  .getChild( "current_conditions").toElement();
00073 
00074     if ( child2 ) {
00075         parseWeather(child2);
00076     }
00077 
00078     if ( NULL != parser.getError() ) {
00079         printf( "\n\nerror: %s\n", parser.getError() );
00080     }
00081 
00082     printf("end\n");
00083 
00084 }