Android AllJoyn：我们可以用两个不同的BusAttachments连接两个不同的设备吗

Question

我一直试图用两个不同的BusAttachment对象连接两个不同的设备，但我得到BusAlreadyExistException？

我在这个位置

aboutClient.startAboutClient(bus); 

我已经尝试了很多方法获得的例外，但无法找到解决办法。我该如何解决这个问题。 在此先感谢。

Answer 1

I don't know your complete code,so I just give some examples as below,hope you can get something on it. 

server: 
int main(int argc, char** argv, char** envArg) 
{ 
    signal(SIGINT, SigIntHandler); 

    QStatus status = ER_OK; 

    s_msgBus = new BusAttachment("myApp", true); 

    InterfaceDescription* testIntf = NULL; 
    s_msgBus->CreateInterface(INTERFACE_NAME, testIntf); 

    testIntf->AddMethod("cat", "ss", "s", "inStr1,inStr2,outStr", 0); 

    testIntf->Activate(); 

s_msgBus->RegisterBusListener(s_busListener); 

s_msgBus->Start(); 

    BasicSampleObject testObj; 

    testObj.AddInterface(*testIntf); 

    const MethodEntry methodEntries[] = { 
      { exampleIntf->GetMember("cat"), static_cast<MessageReceiver::MethodHandler>(&BasicSampleObject::Cat) } 
     }; 

    testObj.AddMethodHandlers(methodEntries, sizeof(methodEntries)/sizeof(methodEntries[0])); 

    s_msgBus->RegisterBusObject(testObj); 

    /* 
     link to router,if exist,connect to it and bundled router 
     then recieve and send message 
    */ 
    s_msbBus->Connect(); 

/* 
    start AdvertiseName,three steps： 
    1、request well-known name 
    2、creat session 
    3、AdvertiseName 
*/ 
    const uint32_t flags = DBUS_NAME_FLAG_REPLACE_EXISTING | DBUS_NAME_FLAG_DO_NOT_QUEUE; 
    s_msgBus->RequestName(SERVICE_NAME, flags); 

    const TransportMask SERVICE_TRANSPORT_TYPE = TRANSPORT_ANY; 
    SessionOpts opts(SessionOpts::TRAFFIC_MESSAGES, false, SessionOpts::PROXIMITY_ANY, SERVICE_TRANSPORT_TYPE); 
    SessionPort sp = SERVICE_PORT; 

    QStatus status = s_msgBus->BindSessionPort(sp, opts, s_busListener); 

    s_msgBus->AdvertiseName(SERVICE_NAME, mask); 

    WaitForSigInt(); 

    delete s_msgBus; 
    s_msgBus = NULL; 

    printf("Basic service exiting with status 0x%04x (%s).\n", status, QCC_StatusText(status)); 

    return (int) status; 
} 

client: 
int main(int argc, char** argv, char** envArg) 
{ 
    signal(SIGINT, SigIntHandler); 
QStatus status = ER_OK; 
g_msgBus = new BusAttachment("myApp", true); 
g_msgBus->CreateInterface(INTERFACE_NAME, testIntf); 
testIntf->AddMethod("cat", "ss", "s", "inStr1,inStr2,outStr", 0); 
testIntf->Activate(); 

g_msgBus->Start(); 
g_msgBus->Connect(); 
static MyBusListener s_busListener; 
g_msgBus->RegisterBusListener(s_busListener); 
//same as the server 

g_msgBus->FindAdvertisedName(SERVICE_NAME); 

WaitForJoinSessionCompletion(); 

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(SERVICE_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); 

delete g_msgBus; 
g_msgBus = NULL; 

printf("Basic client exiting with status 0x%04x (%s).\n", status, QCC_StatusText(status)); 

return (int) status; 
} 
result: 
[server][1] 
[client][1]