HTTPClientStreamingExample.cpp

00001 #include "mbed.h"
00002 #include "EthernetNetIf.h"
00003 #include "HTTPClient.h"
00004 
00005 EthernetNetIf eth; 
00006 HTTPClient http;
00007 
00008 HTTPResult result;
00009 bool completed = false;
00010 void request_callback(HTTPResult r)
00011 {
00012   result = r;
00013   completed = true;
00014 }
00015 
00016 int main() {
00017 
00018   printf("Start\n");
00019 
00020   printf("Setting up...\n");
00021   EthernetErr ethErr = eth.setup();
00022   if(ethErr)
00023   {
00024     printf("Error %d in setup.\n", ethErr);
00025     return -1;
00026   }
00027   printf("Setup OK\n");
00028   
00029   HTTPStream stream;
00030   
00031   char BigBuf[512 + 1] = {0};
00032   stream.readNext((byte*)BigBuf, 512); //Point to buffer for the first read
00033   //HTTPResult r = http.get("http://newsrss.bbc.co.uk/rss/newsonline_uk_edition/front_page/rss.xml", &stream, request_callback); //Load a very large page, such as the hackaday RSS feed
00034   //HTTPResult r = http.get("http://hackaday.com/feed/", &stream, request_callback); //Load a very large page, such as the hackaday RSS feed
00035   HTTPResult r = http.get("http://mbed.org/blog/feeds/entries/", &stream, request_callback); //Load a very large page
00036   
00037   while(!completed)
00038   {
00039     Net::poll(); //Polls the Networking stack
00040     if(stream.readable())
00041     {
00042       BigBuf[stream.readLen()] = 0; //Transform this buffer in a zero-terminated char* string
00043       printf("%s",BigBuf); //Display it while loading
00044       //Note: some servers do not like if you throttle them too much, so printf'ing during a request is generally bad practice
00045       stream.readNext((byte*)BigBuf, 512); //Buffer has been read, now we can put more data in it
00046     }
00047   }
00048   printf("\n--------------\n");
00049   if(result == HTTP_OK)
00050   {
00051     printf("Read completely\n"); 
00052   }
00053   else
00054   {
00055     printf("Error %d\n", result);
00056   }
00057   
00058   while(1)
00059   {
00060   
00061   }
00062   
00063   return 0;
00064   
00065 }