update

cpp/consumer.cpp

@@ -0,0 +1,91 @@
+//
+// Created by sunny on 2020/7/24.
+//
+
+#include <ndn-cxx/face.hpp>
+#include <ndn-cxx/lp/tags.hpp>
+#include <ndn-cxx/lp/lp-headers.hpp>
+#include <string>
+#include <iostream>
+
+// Enclosing code in ndn simplifies coding (can also use `using namespace ndn`)
+namespace ndn {
+// Additional nested namespaces can be used to prevent/limit name conflicts
+  namespace examples {
+
+    class Consumer : noncopyable {
+    public:
+      void
+      run() {
+        Interest interest(Name("/test/hello/" + std::to_string(1)));
+
+        // 如果需要传递参数，可以通过一下方式传递
+        std::string param = "{\"code\": 1, \"msg\": \"balabala\"}";
+        interest.setApplicationParameters(reinterpret_cast<const uint8_t *>(param.data()), param.size());
+
+        // 设置兴趣包的生存期，超过这个生存期没有收到对应的数据包，兴趣包就会触发超时
+        interest.setInterestLifetime(2_s); // 2 seconds
+
+        // 设置如果强制刷新，则不会命中途中路由器的缓存
+        interest.setMustBeFresh(true);
+
+        interest.setTag(make_shared<lp::CongestionMarkTag>(1));
+        interest.setTag(make_shared<lp::PktTypeTag>(2));
+        auto srcTag = make_shared<lp::SrcAddrTag>(lp::SrcAddrHeader(Name("/testSrcAddr")));
+        interest.setTag(srcTag);
+        srcTag->get().getMyPrefix()->wireEncode();
+        interest.setTag(make_shared<lp::DstAddrTag>(lp::DstAddrHeader(Name("/testDstAddr"))));
+        interest.setTag(make_shared<lp::BackupNameTag>(lp::BackupNameHeader(Name("/testBackupName"))));
+        auto cachePolicy = lp::CachePolicy();
+        cachePolicy.setPolicy(lp::CachePolicyType::NO_CACHE);
+        interest.setTag(make_shared<lp::CachePolicyTag>(cachePolicy));
+
+        // 发送兴趣包
+        m_face.expressInterest(interest,
+                               bind(&Consumer::onData, this, _1, _2),
+                               bind(&Consumer::onNack, this, _1, _2),
+                               bind(&Consumer::onTimeout, this, _1));
+
+        std::cout << "Sending " << interest << std::endl;
+
+        // 需要调用processEvents处理NDN事件，这样才能处理收到的数据包，要不然程序就直接退出了
+        // 这个操作会一直阻塞，直到处理完所有的NDN事件
+        // processEvents will block until the requested data received or timeout occurs
+        m_face.processEvents();
+      }
+
+    private:
+      void
+      onData(const Interest &interest, const Data &data) {
+        std::cout << data << std::endl;
+      }
+
+      void
+      onNack(const Interest &interest, const lp::Nack &nack) {
+        std::cout << "received Nack with reason " << nack.getReason()
+                  << " for interest " << interest << std::endl;
+      }
+
+      void
+      onTimeout(const Interest &interest) {
+        std::cout << "Timeout " << interest << std::endl;
+      }
+
+    private:
+      Face m_face;
+    };
+
+  } // namespace examples
+} // namespace ndn
+
+int
+main(int argc, char **argv) {
+  ndn::examples::Consumer consumer;
+  try {
+    consumer.run();
+  }
+  catch (const std::exception &e) {
+    std::cerr << "ERROR: " << e.what() << std::endl;
+  }
+  return 0;
+}