Add libaria2 examples

examples/libaria2ex.cc

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+/* <!-- copyright */
+/*
+ * aria2 - The high speed download utility
+ *
+ * Copyright (C) 2013 Tatsuhiro Tsujikawa
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * In addition, as a special exception, the copyright holders give
+ * permission to link the code of portions of this program with the
+ * OpenSSL library under certain conditions as described in each
+ * individual source file, and distribute linked combinations
+ * including the two.
+ * You must obey the GNU General Public License in all respects
+ * for all of the code used other than OpenSSL.  If you modify
+ * file(s) with this exception, you may extend this exception to your
+ * version of the file(s), but you are not obligated to do so.  If you
+ * do not wish to do so, delete this exception statement from your
+ * version.  If you delete this exception statement from all source
+ * files in the program, then also delete it here.
+ */
+/* copyright --> */
+//
+// Compile and link like this:
+// $ g++ -Wall -O2 -g -std=c++11 -o libaria2ex libaria2ex.cc -laria2
+#include <iostream>
+#include <chrono>
+
+#include <aria2/aria2.h>
+
+int main()
+{
+  aria2::libraryInit();
+  // session is actually singleton: 1 session per process
+  aria2::Session* session;
+  // Use default configuration
+  aria2::SessionConfig config;
+  session = aria2::sessionNew(aria2::KeyVals(), config);
+  std::vector<std::string> uris = {
+    "http://localhost/"
+  };
+  // Download files are stored in the current directory
+  aria2::KeyVals options = { std::make_pair("dir", ".") };
+  // Add URI
+  aria2::A2Gid gid;
+  aria2::addUri(session, gid, uris, options);
+  auto start = std::chrono::steady_clock::now();
+  for(;;) {
+    int rv = aria2::run(session, aria2::RUN_ONCE);
+    if(rv != 1) {
+      break;
+    }
+    // the application can call aria2 API to add URI or query progress
+    // here
+    auto now = std::chrono::steady_clock::now();
+    auto count = std::chrono::duration_cast<std::chrono::milliseconds>
+      (now - start).count();
+    if(count >= 500) {
+      start = now;
+      std::vector<aria2::A2Gid> gids = aria2::getActiveDownload(session);
+      std::cout << "== Active Download(s) ==" << std::endl;
+      for(auto gid : gids) {
+        aria2::DownloadHandle* dh = aria2::getDownloadHandle(session, gid);
+        if(dh) {
+          std::cout << "[" << aria2::gidToHex(gid) << "] "
+                    << dh->getCompletedLength() << "/"
+                    << dh->getTotalLength() << " D:"
+                    << dh->getDownloadSpeed()/1024 << "KiB/s, U:"
+                    << dh->getUploadSpeed()/1024 << "KiB/s"
+                    << std::endl;
+          aria2::deleteDownloadHandle(dh);
+        }
+      }
+    }
+  }
+  int rv = aria2::sessionFinal(session);
+  aria2::libraryDeinit();
+  return rv;
+}