Hendrik Lipka
Demonstrates the use of the spxml library to read and parse streamed XML (via HTTP). It calls out to the google weather API, parses the resulting XML and prints out the current temperature (for Los Angeles). It makes use of the HTTPClient library.
Revision 0:ee591985c885, committed 2010-11-24
- Comitter:
- hlipka
- Date:
- Wed Nov 24 21:23:15 2010 +0000
- Commit message:
- first public version
Changed in this revision
diff -r 000000000000 -r ee591985c885 HTTPClient.lib --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/HTTPClient.lib Wed Nov 24 21:23:15 2010 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/donatien/code/HTTPClient/#d0be6af2d1db
diff -r 000000000000 -r ee591985c885 NetServices.lib --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/NetServices.lib Wed Nov 24 21:23:15 2010 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/segundo/code/NetServices/#4e2468d7d5cb
diff -r 000000000000 -r ee591985c885 main.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Wed Nov 24 21:23:15 2010 +0000
@@ -0,0 +1,84 @@
+#include "mbed.h"
+
+#include "EthernetNetIf.h"
+#include "HTTPClient.h"
+
+#include "spdomparser.hpp"
+#include "spxmlnode.hpp"
+#include "spxmlhandle.hpp"
+
+EthernetNetIf eth;
+HTTPClient http;
+
+HTTPResult result;
+bool completed = false;
+void request_callback(HTTPResult r) {
+ result = r;
+ completed = true;
+}
+
+void parseWeather(SP_XmlElementNode *node) {
+ SP_XmlHandle handle(node);
+ SP_XmlElementNode * tempc = handle.getChild( "temp_c" ).toElement();
+ if (tempc) {
+ printf("current temp=%sC\n",tempc->getAttrValue("data"));
+ }
+ SP_XmlElementNode * tempf = handle.getChild( "temp_f" ).toElement();
+ if (tempf) {
+ printf("current temp=%sF\n",tempf->getAttrValue("data"));
+ }
+}
+
+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
+
+ printf("setup\n");
+ EthernetErr ethErr = eth.setup();
+ if (ethErr) {
+ printf("Error in setup\n");
+ return -1;
+ }
+ printf("setup ok\n");
+
+ SP_XmlDomParser parser;
+
+ HTTPStream stream;
+
+ char BigBuf[512 + 1] = {0};
+ stream.readNext((byte*)BigBuf, 512); //Point to buffer for the first read
+
+ HTTPResult r = http.get("http://www.google.com/ig/api?weather=Los+Angeles", &stream, request_callback);
+
+ while (!completed) {
+ Net::poll(); //Polls the Networking stack
+ if (stream.readable()) {
+ BigBuf[stream.readLen()] = 0; //Transform this buffer in a zero-terminated char* string
+
+ parser.append( BigBuf, strlen(BigBuf)); // stream current buffer data to the XML parser
+
+ stream.readNext((byte*)BigBuf, 512); //Buffer has been read, now we can put more data in it
+ }
+ }
+ if (result == HTTP_OK) {
+ printf("Read completely\n");
+ } else {
+ printf("Error %d\n", result);
+ return -1;
+ }
+
+ SP_XmlHandle rootHandle( parser.getDocument()->getRootElement() );
+ SP_XmlElementNode * child2 = rootHandle.getChild( "weather" )
+ .getChild( "current_conditions").toElement();
+
+ if ( child2 ) {
+ parseWeather(child2);
+ }
+
+ if ( NULL != parser.getError() ) {
+ printf( "\n\nerror: %s\n", parser.getError() );
+ }
+
+ printf("end\n");
+
+}
diff -r 000000000000 -r ee591985c885 mbed.bld --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Wed Nov 24 21:23:15 2010 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/e2ac27c8e93e
diff -r 000000000000 -r ee591985c885 spxml.lib --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/spxml.lib Wed Nov 24 21:23:15 2010 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/hlipka/code/spxml/#3fa97f2c0505