checks http://wedgefest.wind.ttu.edu/obs/TTU_LBBW.html every 5 minutes and records the temperature and humidity values located in the webpage's text
Dependencies: EthernetNetIf mbed
getweather.cpp
- Committer:
- elliotb
- Date:
- 2010-08-10
- Revision:
- 1:35888a9f0a48
- Parent:
- 0:f46e4f26425a
File content as of revision 1:35888a9f0a48:
#include "mbed.h" #include "EthernetNetIf.h" #include "HTTPClient.h" EthernetNetIf eth; HTTPClient http; HTTPStream stream; HTTPResult result; Ticker update; char * location; char temperature[3]; // two digit characters plus null terminating char char humidity[3]; char BigBuf[512 + 1] = {0}; bool completed = false; void request_callback(HTTPResult r) { result = r; completed = true; } void checkweather(void); /* main */ int main() { printf("Start\n"); printf("Setting up...\n"); EthernetErr ethErr = eth.setup(); if (ethErr) { printf("Error %d in setup.\n", ethErr); return -1; } printf("Setup OK\n"); checkweather(); // call check weather to start off update.attach(&checkweather, 5*60); // check the weather every 5 mins while (1) { // forever loop...weather checking will be interrupt based } } void checkweather(void) { stream.readNext((byte*)BigBuf, 512); HTTPResult r = http.get("http://wedgefest.wind.ttu.edu/obs/TTU_LBBW.html", &stream, request_callback); //Load a very large page while (!completed) { Net::poll(); //Polls the Networking stack if (stream.readable()) { BigBuf[stream.readLen()] = 0; //Transform this buffer in a zero-terminated char* string // look for key words in the html text location = strstr(BigBuf,"Temperature"); if (location != NULL) { strncpy(temperature,location+43,2); location = NULL; } location = strstr(BigBuf,"Humidity"); if (location != NULL) { strncpy(humidity,location+40,2); location = NULL; } stream.readNext((byte*)BigBuf, 512); //Buffer has been read, now we can put more data in it } } printf("\n--------------\n"); if (result == HTTP_OK) { printf("Read completely\n"); printf("Temperature: %s deg F \n",temperature); printf("Humidity: %s percent \n",humidity); completed = false; // allows the weather to be checked more than once } else { printf("Error %d\n", result); } }