Created
July 6, 2016 19:34
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Display the last entry of a certain field for a specific channel with c.
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/*************************************************************************** | |
* _ _ ____ _ | |
* Project ___| | | | _ \| | | |
* / __| | | | |_) | | | |
* | (__| |_| | _ <| |___ | |
* \___|\___/|_| \_\_____| | |
* | |
* Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al. | |
* | |
* This software is licensed as described in the file COPYING, which | |
* you should have received as part of this distribution. The terms | |
* are also available at https://curl.haxx.se/docs/copyright.html. | |
* | |
* You may opt to use, copy, modify, merge, publish, distribute and/or sell | |
* copies of the Software, and permit persons to whom the Software is | |
* furnished to do so, under the terms of the COPYING file. | |
* | |
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY | |
* KIND, either express or implied. | |
* | |
***************************************************************************/ | |
/* <DESC> | |
* Simple HTTPS GET | |
* </DESC> | |
*/ | |
#include <stdio.h> | |
#include <curl/curl.h> | |
int main(void) | |
{ | |
CURL *curl; | |
CURLcode res; | |
curl_global_init(CURL_GLOBAL_DEFAULT); | |
curl = curl_easy_init(); | |
if(curl) { | |
curl_easy_setopt(curl, CURLOPT_URL, "https://api.thingspeak.com/channels/104274/fields/field1/last"); | |
#ifdef SKIP_PEER_VERIFICATION | |
/* | |
* If you want to connect to a site who isn't using a certificate that is | |
* signed by one of the certs in the CA bundle you have, you can skip the | |
* verification of the server's certificate. This makes the connection | |
* A LOT LESS SECURE. | |
* | |
* If you have a CA cert for the server stored someplace else than in the | |
* default bundle, then the CURLOPT_CAPATH option might come handy for | |
* you. | |
*/ | |
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L); | |
#endif | |
#ifdef SKIP_HOSTNAME_VERIFICATION | |
/* | |
* If the site you're connecting to uses a different host name that what | |
* they have mentioned in their server certificate's commonName (or | |
* subjectAltName) fields, libcurl will refuse to connect. You can skip | |
* this check, but this will make the connection less secure. | |
*/ | |
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L); | |
#endif | |
/* Perform the request, res will get the return code */ | |
res = curl_easy_perform(curl); | |
/* Check for errors */ | |
if(res != CURLE_OK) | |
fprintf(stderr, "curl_easy_perform() failed: %s\n", | |
curl_easy_strerror(res)); | |
/* always cleanup */ | |
curl_easy_cleanup(curl); | |
} | |
curl_global_cleanup(); | |
return 0; | |
} |
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