AllJoyn+C++开发案例-windows跨设备调用方法
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AllJoyn+C++开发案例-windows跨设备调用方法
按照上一篇的AllJoyn+Android开发案例-android跨设备调用方法中，步骤二-开始着手windows间的跨平台方法例程的编写。具体参考上一篇：http://blog.csdn.net/jsjdtb356/article/details/51179564。
不同于java，windows编程的api core官网并没有给出介绍，如下图，地址：https://allseenalliance.org/framework/documentation/develop/api-guide/core。
无奈再去找building下关于windows的介绍，地址：
https://allseenalliance.org/framework/documentation/develop/building/windows/build-source，主要说的都是一些工具
VS，python，junit，scons等等，最后才有一些关于运行测试实例的话，基本没有什么帮助。然后去下载地址下载了
Windows SDK（64bit）VS2012版本的包。解压后的文件目录如下：
注意我红色框出来的部分，解压后会有两个版本出来，一个是release版，一个debug版，在后面VS调试时，会有区分的。然后我再cpp包下bin中的samples实例中，去找了实例chat来运行，可以实现不同window设备之间的相互聊天。然后问题来了，就是如何自己实现一个alljoyn的实例。我参考的是cpp下的sample下的basic中的源码实例，basic源码实例中也是包含了，一个server和一个client，然后client去调用server的方法。
下面我先直接贴上server和client的源码，大家先看server和client的main方法，对过程有个大致认识。我的理解是实现过程和android端过程基本相同，在总线接口的实现方面不同，C++用了InterfaceDescription这样一个接口描述类来帮助接口的实现。
server源码：
#include <qcc/platform.h>#include <assert.h>#include <signal.h>#include <stdio.h>#include <vector>#include <qcc/String.h>#include <alljoyn/AllJoynStd.h>#include <alljoyn/BusAttachment.h>#include <alljoyn/BusObject.h>#include <alljoyn/DBusStd.h>#include <alljoyn/Init.h>#include <alljoyn/MsgArg.h>#include <alljoyn/version.h>#include <alljoyn/Status.h>using namespace std;using namespace qcc;using namespace ajn;/*constants*/static const char* INTERFACE_NAME = "org.alljoyn.Bus.sample";static const char* SERVICE_NAME = "org.alljoyn.Bus.sample";static const char* SERVICE_PATH = "/sample";static const SessionPort SERVICE_PORT = 25;static volatile sig_atomic_t s_interrupt = false;static void CDECL_CALL SigIntHandler(int sig){ QCC_UNUSED(sig); s_interrupt = true;}class BasicSampleObject : public BusObject { public: BasicSampleObject(BusAttachment& bus, const char* path) : BusObject(path) { /** Add the test interface to this object */ const InterfaceDescription* exampleIntf = bus.GetInterface(INTERFACE_NAME); assert(exampleIntf); AddInterface(*exampleIntf); /** Register the method handlers with the object */ const MethodEntry methodEntries[] = { { exampleIntf->GetMember("cat"), static_cast<MessageReceiver::MethodHandler>(&BasicSampleObject::Cat) } }; QStatus status = AddMethodHandlers(methodEntries, sizeof(methodEntries) / sizeof(methodEntries[0])); if (ER_OK != status) { printf("Failed to register method handlers for BasicSampleObject.\n"); } } void ObjectRegistered() { BusObject::ObjectRegistered(); printf("ObjectRegistered has been called.\n"); } void Cat(const InterfaceDescription::Member* member, Message& msg) { QCC_UNUSED(member); /* Concatenate the two input strings and reply with the result. */ qcc::String inStr1 = msg->GetArg(0)->v_string.str; qcc::String inStr2 = msg->GetArg(1)->v_string.str; qcc::String outStr = inStr1 + inStr2; MsgArg outArg("s", outStr.c_str()); QStatus status = MethodReply(msg, &outArg, 1); if (ER_OK != status) { printf("Ping: Error sending reply.\n"); } }};class MyBusListener : public BusListener, public SessionPortListener { void NameOwnerChanged(const char* busName, const char* previousOwner, const char* newOwner) { if (newOwner && (0 == strcmp(busName, SERVICE_NAME))) { printf("NameOwnerChanged: name=%s, oldOwner=%s, newOwner=%s.\n", busName, previousOwner ? previousOwner : "<none>", newOwner ? newOwner : "<none>"); } } bool AcceptSessionJoiner(SessionPort sessionPort, const char* joiner, const SessionOpts& opts) { if (sessionPort != SERVICE_PORT) { printf("Rejecting join attempt on unexpected session port %d.\n", sessionPort); return false; } printf("Accepting join session request from %s (opts.proximity=%x, opts.traffic=%x, opts.transports=%x).\n", joiner, opts.proximity, opts.traffic, opts.transports); return true; }};/** The bus listener object. */static MyBusListener s_busListener;/** Top level message bus object. */static BusAttachment* s_msgBus = NULL;/** Create the interface, report the result to stdout, and return the result status. */QStatus CreateInterface(void){ /* Add org.alljoyn.Bus.method_sample interface */ InterfaceDescription* testIntf = NULL; QStatus status = s_msgBus->CreateInterface(INTERFACE_NAME, testIntf); if (status == ER_OK) { printf("Interface created.\n"); testIntf->AddMethod("cat", "ss", "s", "inStr1,inStr2,outStr", 0); testIntf->Activate(); } else { printf("Failed to create interface '%s'.\n", INTERFACE_NAME); } return status;}/** Register the bus object and connect, report the result to stdout, and return the status code. */QStatus RegisterBusObject(BasicSampleObject* obj){ QStatus status = s_msgBus->RegisterBusObject(*obj); if (ER_OK == status) { printf("RegisterBusObject succeeded.\n"); } else { printf("RegisterBusObject failed (%s).\n", QCC_StatusText(status)); } return status;}/** Connect, report the result to stdout, and return the status code. */QStatus ConnectBusAttachment(void){ QStatus status = s_msgBus->Connect(); if (ER_OK == status) { printf("Connect to '%s' succeeded.\n", s_msgBus->GetConnectSpec().c_str()); } else { printf("Failed to connect to '%s' (%s).\n", s_msgBus->GetConnectSpec().c_str(), QCC_StatusText(status)); } return status;}/** Start the message bus, report the result to stdout, and return the status code. */QStatus StartMessageBus(void){ QStatus status = s_msgBus->Start(); if (ER_OK == status) { printf("BusAttachment started.\n"); } else { printf("Start of BusAttachment failed (%s).\n", QCC_StatusText(status)); } return status;}/** Create the session, report the result to stdout, and return the status code. */QStatus CreateSession(TransportMask mask){ SessionOpts opts(SessionOpts::TRAFFIC_MESSAGES, false, SessionOpts::PROXIMITY_ANY, mask); SessionPort sp = SERVICE_PORT; QStatus status = s_msgBus->BindSessionPort(sp, opts, s_busListener); if (ER_OK == status) { printf("BindSessionPort succeeded.\n"); } else { printf("BindSessionPort failed (%s).\n", QCC_StatusText(status)); } return status;}/** Advertise the service name, report the result to stdout, and return the status code. */QStatus AdvertiseName(TransportMask mask){ QStatus status = s_msgBus->AdvertiseName(SERVICE_NAME, mask); if (ER_OK == status) { printf("Advertisement of the service name '%s' succeeded.\n", SERVICE_NAME); } else { printf("Failed to advertise name '%s' (%s).\n", SERVICE_NAME, QCC_StatusText(status)); } return status;}/** Request the service name, report the result to stdout, and return the status code. */QStatus RequestName(void){ const uint32_t flags = DBUS_NAME_FLAG_REPLACE_EXISTING | DBUS_NAME_FLAG_DO_NOT_QUEUE; QStatus status = s_msgBus->RequestName(SERVICE_NAME, flags); if (ER_OK == status) { printf("RequestName('%s') succeeded.\n", SERVICE_NAME); } else { printf("RequestName('%s') failed (status=%s).\n", SERVICE_NAME, QCC_StatusText(status)); } return status;}/** Wait for SIGINT before continuing. */void WaitForSigInt(void){ while (s_interrupt == false) {#ifdef _WIN32 Sleep(100);#else usleep(100 * 1000);#endif }}/** Main entry point */int CDECL_CALL main(int argc, char** argv, char** envArg){ QCC_UNUSED(argc); QCC_UNUSED(argv); QCC_UNUSED(envArg); if (AllJoynInit() != ER_OK) { return 1; }#ifdef ROUTER if (AllJoynRouterInit() != ER_OK) { AllJoynShutdown(); return 1; }#endif printf("AllJoyn Library version: %s.\n", ajn::GetVersion()); printf("AllJoyn Library build info: %s.\n", ajn::GetBuildInfo()); /* Install SIGINT handler */ signal(SIGINT, SigIntHandler); QStatus status = ER_OK; BasicSampleObject* testObj = NULL; /* Create message bus */ s_msgBus = new BusAttachment("myApp", true); if (s_msgBus) { if (ER_OK == status) { status = CreateInterface(); } if (ER_OK == status) { s_msgBus->RegisterBusListener(s_busListener); } if (ER_OK == status) { status = StartMessageBus(); } testObj = new BasicSampleObject(*s_msgBus, SERVICE_PATH); if (ER_OK == status) { status = RegisterBusObject(testObj); } if (ER_OK == status) { status = ConnectBusAttachment(); } /* * Advertise this service on the bus. * There are three steps to advertising this service on the bus. * 1) Request a well-known name that will be used by the client to discover * this service. * 2) Create a session. * 3) Advertise the well-known name. */ if (ER_OK == status) { status = RequestName(); } const TransportMask SERVICE_TRANSPORT_TYPE = TRANSPORT_ANY; if (ER_OK == status) { status = CreateSession(SERVICE_TRANSPORT_TYPE); } if (ER_OK == status) { status = AdvertiseName(SERVICE_TRANSPORT_TYPE); } /* Perform the service asynchronously until the user signals for an exit. */ if (ER_OK == status) { WaitForSigInt(); } } else { status = ER_OUT_OF_MEMORY; } /* Clean up */ delete s_msgBus; s_msgBus = NULL; delete testObj; testObj = NULL; printf("Basic service exiting with status 0x%04x (%s).\n", status, QCC_StatusText(status));#ifdef ROUTER AllJoynRouterShutdown();#endif AllJoynShutdown(); return (int) status;}client源码：#include <qcc/platform.h>#include <assert.h>#include <signal.h>#include <stdio.h>#include <vector>#include <qcc/String.h>#include <alljoyn/AllJoynStd.h>#include <alljoyn/BusAttachment.h>#include <alljoyn/Init.h>#include <alljoyn/Status.h>#include <alljoyn/version.h>using namespace std;using namespace qcc;using namespace ajn;/** Static top level message bus object */static BusAttachment* g_msgBus = NULL;/*constants*/static const char* INTERFACE_NAME = "org.alljoyn.Bus.sample";static const char* SERVICE_NAME = "org.alljoyn.Bus.sample";static const char* SERVICE_PATH = "/sample";static const SessionPort SERVICE_PORT = 25;static bool s_joinComplete = false;static String s_sessionHost;static SessionId s_sessionId = 0;static volatile sig_atomic_t s_interrupt = false;static void CDECL_CALL SigIntHandler(int sig){ QCC_UNUSED(sig); s_interrupt = true;}/** AllJoynListener receives discovery events from AllJoyn */class MyBusListener : public BusListener, public SessionListener { public: void FoundAdvertisedName(const char* name, TransportMask transport, const char* namePrefix) { if (0 == strcmp(name, SERVICE_NAME) && s_sessionHost.empty()) { printf("FoundAdvertisedName(name='%s', transport = 0x%x, prefix='%s')\n", name, transport, namePrefix); /* We found a remote bus that is advertising basic service's well-known name so connect to it. */ /* Since we are in a callback we must enable concurrent callbacks before calling a synchronous method. */ s_sessionHost = name; g_msgBus->EnableConcurrentCallbacks(); SessionOpts opts(SessionOpts::TRAFFIC_MESSAGES, false, SessionOpts::PROXIMITY_ANY, TRANSPORT_ANY); QStatus status = g_msgBus->JoinSession(name, SERVICE_PORT, this, s_sessionId, opts); if (ER_OK == status) { printf("JoinSession SUCCESS (Session id=%d).\n", s_sessionId); } else { printf("JoinSession failed (status=%s).\n", QCC_StatusText(status)); } s_joinComplete = true; } } void NameOwnerChanged(const char* busName, const char* previousOwner, const char* newOwner) { if (newOwner && (0 == strcmp(busName, SERVICE_NAME))) { printf("NameOwnerChanged: name='%s', oldOwner='%s', newOwner='%s'.\n", busName, previousOwner ? previousOwner : "<none>", newOwner ? newOwner : "<none>"); } }};/** Create the interface, report the result to stdout, and return the result status. */QStatus CreateInterface(void){ /* Add org.alljoyn.Bus.method_sample interface */ InterfaceDescription* testIntf = NULL; QStatus status = g_msgBus->CreateInterface(INTERFACE_NAME, testIntf); if (status == ER_OK) { printf("Interface '%s' created.\n", INTERFACE_NAME); testIntf->AddMethod("cat", "ss", "s", "inStr1,inStr2,outStr", 0); testIntf->Activate(); } else { printf("Failed to create interface '%s'.\n", INTERFACE_NAME); } return status;}/** Start the message bus, report the result to stdout, and return the result status. */QStatus StartMessageBus(void){ QStatus status = g_msgBus->Start(); if (ER_OK == status) { printf("BusAttachment started.\n"); } else { printf("BusAttachment::Start failed.\n"); } return status;}/** Handle the connection to the bus, report the result to stdout, and return the result status. */QStatus ConnectToBus(void){ QStatus status = g_msgBus->Connect(); if (ER_OK == status) { printf("BusAttachment connected to '%s'.\n", g_msgBus->GetConnectSpec().c_str()); } else { printf("BusAttachment::Connect('%s') failed.\n", g_msgBus->GetConnectSpec().c_str()); } return status;}/** Register a bus listener in order to get discovery indications and report the event to stdout. */void RegisterBusListener(void){ /* Static bus listener */ static MyBusListener s_busListener; g_msgBus->RegisterBusListener(s_busListener); printf("BusListener Registered.\n");}/** Begin discovery on the well-known name of the service to be called, report the result to stdout, and return the result status. */QStatus FindAdvertisedName(void){ /* Begin discovery on the well-known name of the service to be called */ QStatus status = g_msgBus->FindAdvertisedName(SERVICE_NAME); if (status == ER_OK) { printf("org.alljoyn.Bus.FindAdvertisedName ('%s') succeeded.\n", SERVICE_NAME); } else { printf("org.alljoyn.Bus.FindAdvertisedName ('%s') failed (%s).\n", SERVICE_NAME, QCC_StatusText(status)); } return status;}/** Wait for join session to complete, report the event to stdout, and return the result status. */QStatus WaitForJoinSessionCompletion(void){ unsigned int count = 0; while (!s_joinComplete && !s_interrupt) { if (0 == (count++ % 10)) { printf("Waited %u seconds for JoinSession completion.\n", count / 10); }#ifdef _WIN32 Sleep(100);#else usleep(100 * 1000);#endif } return s_joinComplete && !s_interrupt ? ER_OK : ER_ALLJOYN_JOINSESSION_REPLY_CONNECT_FAILED;}/** Do a method call, report the result to stdout, and return the result status. */QStatus MakeMethodCall(void){ ProxyBusObject remoteObj(*g_msgBus, SERVICE_NAME, SERVICE_PATH, s_sessionId); const InterfaceDescription* alljoynTestIntf = g_msgBus->GetInterface(INTERFACE_NAME); assert(alljoynTestIntf); remoteObj.AddInterface(*alljoynTestIntf); Message reply(*g_msgBus); MsgArg inputs[2]; inputs[0].Set("s", "Hello "); inputs[1].Set("s", "World!"); QStatus status = remoteObj.MethodCall(INTERFACE_NAME, "cat", inputs, 2, reply, 5000); if (ER_OK == status) { printf("'%s.%s' (path='%s') returned '%s'.\n", SERVICE_NAME, "cat", SERVICE_PATH, reply->GetArg(0)->v_string.str); } else { printf("MethodCall on '%s.%s' failed.", SERVICE_NAME, "cat"); } return status;}/** Main entry point */int CDECL_CALL main(int argc, char** argv, char** envArg){ QCC_UNUSED(argc); QCC_UNUSED(argv); QCC_UNUSED(envArg); if (AllJoynInit() != ER_OK) { return 1; }#ifdef ROUTER if (AllJoynRouterInit() != ER_OK) { AllJoynShutdown(); return 1; }#endif printf("AllJoyn Library version: %s.\n", ajn::GetVersion()); printf("AllJoyn Library build info: %s.\n", ajn::GetBuildInfo()); /* Install SIGINT handler. */ signal(SIGINT, SigIntHandler); QStatus status = ER_OK; /* Create message bus. */ g_msgBus = new BusAttachment("myApp", true); /* This test for NULL is only required if new() behavior is to return NULL * instead of throwing an exception upon an out of memory failure. */ if (!g_msgBus) { status = ER_OUT_OF_MEMORY; } if (ER_OK == status) { status = CreateInterface(); } if (ER_OK == status) { status = StartMessageBus(); } if (ER_OK == status) { status = ConnectToBus(); } if (ER_OK == status) { RegisterBusListener(); status = FindAdvertisedName(); } if (ER_OK == status) { status = WaitForJoinSessionCompletion(); } if (ER_OK == status) { status = MakeMethodCall(); } /* Deallocate bus */ delete g_msgBus; g_msgBus = NULL; printf("Basic client exiting with status 0x%04x (%s).\n", status, QCC_StatusText(status));#ifdef ROUTER AllJoynRouterShutdown();#endif AllJoynShutdown(); return (int) status;}下面总结一下一般步骤：step1：VS2015新建控制台工程之后，选择调试/属性，出现如下图：
注意：我的包名称是-Windows SDK（64bit）VS2012。
配置选择release，因为我用的是sdk下的release包，请对应选择。平台64位，我下载的包是64位，请对应选择。平台工具集是VS2012，不是默认的2015，因为我的包是2012。平台工具集没有VS2012的话，去下载VS2012安装完成就有了，或者直接使用VS2012。
添加附加包含目录：
红色框框出来的部分，添加release包下的cpp下的inc文件夹，包含头文件。
附加库目录：
框出来部分，添加release下的cpp下的lib目录。
添加附加依赖项：
框出来的部分，添加ajrouter.lib和alljoyn.lib静态库。
到这里编写代码前的环境基本完成了。
step2：
测试代码编写，一个简单的client和server的测试代码如上所示，C++总线接口的实现：
/** Create the interface, report the result to stdout, and return the result status. */QStatus CreateInterface(void){ /* Add org.alljoyn.Bus.method_sample interface */ InterfaceDescription* testIntf = NULL; QStatus status = s_msgBus->CreateInterface(INTERFACE_NAME, testIntf); if (status == ER_OK) { printf("Interface created.\n"); testIntf->AddMethod("cat", "ss", "s", "inStr1,inStr2,outStr", 0); testIntf->Activate(); } else { printf("Failed to create interface '%s'.\n", INTERFACE_NAME); } return status;} interface的声明，INTERFACE_NAME是全局变量，InterfaceDescription实现接口的描述，增加方法cat方法，传入两个str，传出一个str。 interface在server中的实现代码：
class BasicSampleObject : public BusObject { public: BasicSampleObject(BusAttachment& bus, const char* path) : BusObject(path) { /** Add the test interface to this object */ const InterfaceDescription* exampleIntf = bus.GetInterface(INTERFACE_NAME); assert(exampleIntf); AddInterface(*exampleIntf); /** Register the method handlers with the object */ const MethodEntry methodEntries[] = { { exampleIntf->GetMember("cat"), static_cast<MessageReceiver::MethodHandler>(&BasicSampleObject::Cat) } }; QStatus status = AddMethodHandlers(methodEntries, sizeof(methodEntries) / sizeof(methodEntries[0])); if (ER_OK != status) { printf("Failed to register method handlers for BasicSampleObject.\n"); } } void ObjectRegistered() { BusObject::ObjectRegistered(); printf("ObjectRegistered has been called.\n"); } void Cat(const InterfaceDescription::Member* member, Message& msg) { QCC_UNUSED(member); /* Concatenate the two input strings and reply with the result. */ qcc::String inStr1 = msg->GetArg(0)->v_string.str; qcc::String inStr2 = msg->GetArg(1)->v_string.str; qcc::String outStr = inStr1 + inStr2; MsgArg outArg("s", outStr.c_str()); QStatus status = MethodReply(msg, &outArg, 1); if (ER_OK != status) { printf("Ping: Error sending reply.\n"); } }}; BasicSampleObject类的构造函数中，指定了接口中的cat方法入口为，BasicSampleObject类中的Cat方法，我们在Cat方法中去实现server具体的操作，测试的例子是两个字符串的加法。注意这里和Java中不同的是，函数的参数是放在Message类的对象中的，返回值的方法调用的是MethodReplay。 下面我们再看看client如何实现的方法调用：
/** Do a method call, report the result to stdout, and return the result status. */QStatus MakeMethodCall(void){ ProxyBusObject remoteObj(*g_msgBus, SERVICE_NAME, SERVICE_PATH, s_sessionId); const InterfaceDescription* alljoynTestIntf = g_msgBus->GetInterface(INTERFACE_NAME); assert(alljoynTestIntf); remoteObj.AddInterface(*alljoynTestIntf); Message reply(*g_msgBus); MsgArg inputs[2]; inputs[0].Set("s", "Hello "); inputs[1].Set("s", "World!"); QStatus status = remoteObj.MethodCall(INTERFACE_NAME, "cat", inputs, 2, reply, 5000); if (ER_OK == status) { printf("'%s.%s' (path='%s') returned '%s'.\n", SERVICE_NAME, "cat", SERVICE_PATH, reply->GetArg(0)->v_string.str); } else { printf("MethodCall on '%s.%s' failed.", SERVICE_NAME, "cat"); } return status;} 同java中相同的是创建代理对象，不同的是java中直接从代理对象获得接口之后，使用（void or String）interface.method()就实现了方法的调用和返回。这里用了接口描述，没法直接向java一样的调用方法，传入参数以MsgArg数组实现，传出参数以Message实现。 总结：可能会出现下面的情况，step1和step2做完成之后会出现大量的Link错误，尽量去尝试着修改。没有办法的办法是，导入源码工程去实现想要的功能，这样可移植比较低。方法调用的流程几乎和android端的是一致的，在总线interface的声明和实现上有差别。另外client和server要统一的4个地方，和android端也是一致的，如下：
static const char* INTERFACE_NAME = "org.alljoyn.Bus.sample";static const char* SERVICE_NAME = "org.alljoyn.Bus.sample";static const char* SERVICE_PATH = "/sample";static const SessionPort SERVICE_PORT = 25;
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