no way to compare when less than two revisions

Differences

This shows you the differences between two versions of the page.

@@ Line 1: / Line 1: @@
+====== An example of data access from C/C++ ======
+An example of C code for executing a query to the WebHMI API.
+<code C>
+#include <cstdlib>
+#include <iostream>
+#include <curl/curl.h>
+#include <curl/easy.h>
+#include <fstream>
+using namespace std;
+size_t write_func(void *ptr, size_t size, size_t nmemb, void *userdata)
+{
+        cout.write( (char * ) ptr, size*nmemb); // just output response to screen
+        return size * nmemb;
+}
+int main(int argc, char** argv) {
+    CURL *curl;
+    CURLcode res;
+    char errorBuffer[CURL_ERROR_SIZE];
+    // Create the GET request
+    struct curl_slist *headers = NULL;
+    headers = curl_slist_append(headers, "X-WH-APIKEY: F3C74230818DA487BB2017CE5D0290F4DABCAFD7"); // API Key. If API Key is wrong API will return 401 status code.
+    headers = curl_slist_append(headers, "X-WH-START: 1391165350"); // Start time for report. Unixtime
+    headers = curl_slist_append(headers, "X-WH-END: 1391186951"); // End time for report. Unixtime
+    headers = curl_slist_append(headers, "Accept: application/json");  // Currenlty we support JSON ONLY, required header
+    headers = curl_slist_append(headers, "Content-Type: application/json"); // Currenlty we support JSON ONLY, required header
+    // Init CURL
+    curl = curl_easy_init();
+    if(curl) {
+        curl_easy_setopt(curl, CURLOPT_URL, "http://192.168.0.1/api/event-data/1");  // 1 = ID of report
+        curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
+        curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errorBuffer);
+        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_func);
+        // Attempt to Connect the Server
+        res = curl_easy_perform(curl);
+        if (res == CURLE_OK) {
+            long http_code = 0;
+            curl_easy_getinfo (curl, CURLINFO_RESPONSE_CODE, &http_code);
+            if (http_code == 200 && res != CURLE_ABORTED_BY_CALLBACK) {
+                cout << endl << "Success!"<< endl;
+            } else {
+                cout << endl << "Error! Code: " << http_code << endl;
+            }
+        } else {
+            cout << "Connection Failed! Error: " << errorBuffer << endl;
+        }
+        // Close the connection
+        curl_easy_cleanup(curl);
+    }
+    return 0;
+}
+</code>