AllJoyn C++之SampleDaemon.cc的浅显解析

技术菌的blog 2015-05-13 10:11:20

加精

sampledaemon.cc源码是官方在samples下的一个例子，其主要用于alljoyn瘦客户端，即一些嵌入式设备像arduino,arm等内存、CPU受限的设备，以使它们能够通过些后台daemon接入到标准客户端，这样才能与外界通信。LZ对alljoyn c++部分有部分接触，就来简要谈谈官方这个源文件

我就主要的东西说，头文件、次要函数就忽略了，可以多看看注释。LZ也要积极学习alljoyn，众伙伴轻拍哈

namespace org {

namespace alljoyn {

namespace SampleDaemon {

//默认的daemon名称

const char* DefaultDaemonBusName = "org.alljoyn.BusNode.TestingPurposesOnly";

//瘦客户端认证机制（有信任方式和非信任方式）

const char* ThinClientAuthMechanism = "ALLJOYN_PIN_KEYX";

const char* ThinClientDefaultBusPwd = "1234";

}

}

}

int main(int argc, char** argv)

{

	//输出alljoyn版本号及编译版本号

    std::cout << "AllJoyn Library version: " << ajn::GetVersion() <<

    "\nAllJoyn Library build info: " << ajn::GetBuildInfo() << std::endl;



    // 注册 SIGNT (Ctrl-C) 信号处理

    signal(SIGINT, SigIntHandler);

	

	//要广发的daemon名

    String nameToAdvertise = ::org::alljoyn::SampleDaemon::DefaultDaemonBusName;



    // 命令行处理，如果有的话

    for (int i = 1; i < argc; i++) {

        if (0 == strcmp("-h", argv[i])) {

            usage();

            exit(0);

        } else if (0 == strcmp("-n", argv[i])) {

            if (argc == ++i) {

                std::cout << "option " << argv[i - 1] << " requires a name parameter" << std::endl;

                usage();

                exit(1);

            } else {

                nameToAdvertise = argv[i];

            }

        } else {

            std::cout << "Unknown option " << argv[i] << std::endl;

            usage();

            exit(1);

        }

    }

	

	//创建总线对象 

    BusAttachment msgBus("SampleDaemon", true);



    QStatus status = ER_FAIL;

	//开启总线（内部实际上是启动了多个线程）

    status = msgBus.Start();



    if (ER_OK == status) {

		//设置认证，瘦客户端需要以被信任方式连接此daemon(另外一种方式是非信任方式，不需要认证)

        PasswordManager::SetCredentials(

            ::org::alljoyn::SampleDaemon::ThinClientAuthMechanism,

            ::org::alljoyn::SampleDaemon::ThinClientDefaultBusPwd

            );



        // Force connecting to bundled router (i.e. null transport) to ensure

        // that credentials are correctly set.

        //

        // NOTE: The above SetCredentials call doesn't take effect

        //       when connecting to a daemon.

        status = msgBus.Connect("null:");



        if (ER_OK == status) {

            // 'Quiet'ly advertise the name to be discovered by thin clients.

            // Also, given that thin clients are in the same network as the

            // SampleDaemon, advertise the name ONLY over TCP Transport.

			//此名称是“悄悄地”向外发布的，所以有特定的格式要求

            nameToAdvertise = "quiet@" + nameToAdvertise;

            status = msgBus.AdvertiseName(nameToAdvertise.c_str(), TRANSPORT_TCP);

            if (ER_OK != status) {

                QCC_LogError(status, ("Unable to quietly advertise the name %s", nameToAdvertise.c_str()));

            }

        }

    }



    // Wait for Ctrl-C to exit

    while (!g_interrupted) {

        qcc::Sleep(100);

    }



    QCC_SyncPrintf("%s exiting with status %u (%s)\n", argv[0], status, QCC_StatusText(status));

    return (int) status;

}