Diff: main.cpp

Revision:

1:c96f140b5710

Parent:

0:4a917644acc4

diff -r 4a917644acc4 -r c96f140b5710 main.cpp
--- a/main.cpp	Fri May 25 00:57:24 2012 +0000
+++ b/main.cpp	Thu Mar 07 21:16:40 2013 +0000
@@ -5,10 +5,13 @@
 #include "spxmlnode.hpp"
 #include "spxmlhandle.hpp"
 #include "NokiaLCD.h"
+#include <string>
 // Internet of Things weather display example: LCD displays LA current weather via internet Google API
 // Adapted for LCD from http://mbed.org/users/hlipka/programs/spxmltest_weather/lif782
 
 NokiaLCD lcd(p5, p7, p8, p9, NokiaLCD::LCD6610); // mosi, sclk, cs, rst, type
+DigitalIn but1(p13);
+DigitalIn but2(p14);
 EthernetNetIf eth;
 HTTPClient http;
 HTTPResult result;
@@ -18,31 +21,65 @@
     completed = true;
 }
 
-void parseWeather(SP_XmlElementNode *node) {
+void parseWeather(SP_XmlElementNode *node, string loc) {
     //extracts current weather XML data fields for LCD
     SP_XmlHandle handle(node);
-    SP_XmlElementNode * condition = handle.getChild( "condition" ).toElement();
+    SP_XmlElementNode * condition = handle.getChild( "item" ).getChild("yweather:condition").toElement();
     lcd.cls();
+    // Print the name of the city
     lcd.locate(0,2);
-    lcd.printf("LA:");
-    if (condition) {
-        lcd.printf("%s ",condition->getAttrValue("data"));
-    }
-    SP_XmlElementNode * tempf = handle.getChild( "temp_f" ).toElement();
-    if (tempf) {
-        lcd.printf(" %sF",tempf->getAttrValue("data"));
-    }
-    SP_XmlElementNode * humidity = handle.getChild( "humidity" ).toElement();
-    if (humidity) {
-        lcd.locate(0,3);
-        lcd.printf("%s",humidity->getAttrValue("data"));
-    }
+    lcd.printf("%s:", loc);
+    //Print the weather conditions
+    lcd.locate(0,3);
+    lcd.printf("%s",condition->getAttrValue("text"));
+    //Print the termperature (in degrees Celcius)
+    lcd.locate(0,4);
+    lcd.printf("%sC",condition->getAttrValue("temp"));
+    //Print the date and time
+    lcd.locate(0,5);
+    lcd.printf("%s",condition->getAttrValue("date"));
 }
 
 int main() {
     // the eth and HTTP code has be taken directly from the HTTPStream documentation page
     // see http://mbed.org/cookbook/HTTP-Client-Data-Containers
     lcd.cls();
+    
+    // string arrays associating cities with their codes for the yahoo! API
+    string cities[5] = { "Atlanta", "Houston", "New York", "Seattle", "Sunnyvale" };
+    string codes[5] = { "2357024", "2424766", "2459115", "2490383", "2442047" };
+    
+    string head = "http://weather.yahooapis.com/forecastrss?w=";
+    //Display the cities to choose from
+    for(int i = 0; i < 5; i++){
+        lcd.locate(1, i);
+        lcd.printf("%i: %s", i+1, cities[i]);
+    }
+    
+    int curr = 0;
+    int accept = but1, select = but2, pushed = 0;
+    //This while loop handles selection of cities for display.
+    while(accept == 0){
+        lcd.locate(0, curr);
+        lcd.printf(" ");
+        //The next two if statements check to see if the button has been pushed, and then cycles through the selection choices as appropriate.
+        if(select == 1){
+            pushed = 1;
+        }
+        if((select == 0)&&(pushed == 1)){
+            pushed = 0;
+            curr = (curr + 1)%5;
+        }
+        lcd.locate(0, curr);
+        lcd.printf(">");
+        accept = but1; select = but2;
+    }
+    //Concatenate the city code for use by the Yahoo! API
+    head += codes[curr];
+    head += "&u=c";
+    
+    lcd.cls();
+    
     lcd.locate(0,2);
     lcd.printf("net setup");
     lcd.locate(0,3);
@@ -58,8 +95,8 @@
 
     char BigBuf[512 + 1] = {0};
     stream.readNext((byte*)BigBuf, 512); //Point to buffer for the first read
-    //Google Weather API for Los Angeles - get web page with XML
-    HTTPResult r = http.get("http://www.google.com/ig/api?weather=Los+Angeles", &stream, request_callback);
+    //Yahoo! weather API for selected city - get XML document for parsing
+    HTTPResult r = http.get(head.c_str(), &stream, request_callback);
     while (!completed) {
         Net::poll(); //Polls the Networking stack
         if (stream.readable()) {
@@ -78,10 +115,10 @@
     }
 
     SP_XmlHandle rootHandle( parser.getDocument()->getRootElement() );
-    SP_XmlElementNode * child2 = rootHandle.getChild( "weather" )
-                                 .getChild( "current_conditions").toElement();
+    SP_XmlElementNode * child2 = rootHandle.getChild( "channel" )
+                                 .toElement();
     if ( child2 ) {
-        parseWeather(child2); //parses XML "current-conditions" info
+        parseWeather(child2, cities[curr]); //parses XML "current-conditions" info
     }
 
     if ( NULL != parser.getError() ) {