darwin 读取xml流程

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    QTSSModule* theReflectorModule = new QTSSModule("QTSSReflectorModule");    (void)theReflectorModule->SetupModule(&sCallbacks, &QTSSReflectorModule_Main);    (void)AddModule(theReflectorModule);

1.在QTSSModule构造函数QTSSModule::QTSSModule(char* inName, char* inPath)中，将thePrefs成员变量写入数据字典

this->SetVal(qtssModPrefs, &fPrefs, sizeof(fPrefs));

2.在Bool16 QTSServer::AddModule(QTSSModule* inModule)中，将QTSSPrefs* thePrefs传入模块中,从而实现了fPrefs成员的赋值。thePrefs内部保存了xml信息。

thePrefs->RereadPreferences()将xml写入到数据字典

// Give the module object a prefs dictionary. Instance attributes are allowed for these objects.
QTSSPrefs* thePrefs = NEW QTSSPrefs( sPrefsSource, inModule->GetValue(qtssModName), QTSSDictionaryMap::GetMap(QTSSDictionaryMap::kModulePrefsDictIndex), true);
thePrefs->RereadPreferences();
inModule->SetPrefsDict(thePrefs);

3.在每个模块内部，通过sPrefs = QTSSModuleUtils::GetModulePrefsObject(inParams->inModule);来获取到对应模块的sPrefs，利用sPrefs就可以获取到xml的配置信息了

QTSS_ModulePrefsObject QTSSModuleUtils::GetModulePrefsObject(QTSS_ModuleObject inModObject){    QTSS_ModulePrefsObject thePrefsObject = NULL;    UInt32 theLen = sizeof(thePrefsObject);    QTSS_Error theErr = QTSS_GetValue(inModObject, qtssModPrefs, 0, &thePrefsObject, &theLen);    Assert(theErr == QTSS_NoErr);        return thePrefsObject;}

GetAttribute从数据字典取出之前保存的数据

QTSSModuleUtils::GetAttribute(sPrefs, "disable_rtp_play_info",  qtssAttrDataTypeBool16,                                &sRTPInfoDisabled, &sDefaultRTPInfoDisabled, sizeof(sDefaultRTPInfoDisabled));    QTSSModuleUtils::GetAttribute(sPrefs, "allow_non_sdp_urls",     qtssAttrDataTypeBool16,                                &sAllowNonSDPURLs, &sDefaultAllowNonSDPURLs, sizeof(sDefaultAllowNonSDPURLs));                                                                    QTSSModuleUtils::GetAttribute(sPrefs, "enable_broadcast_announce",  qtssAttrDataTypeBool16,                                &sAnnounceEnabled, &sDefaultAnnounceEnabled, sizeof(sDefaultAnnounceEnabled));    QTSSModuleUtils::GetAttribute(sPrefs, "enable_broadcast_push",  qtssAttrDataTypeBool16,                                &sBroadcastPushEnabled, &sDefaultBroadcastPushEnabled, sizeof(sDefaultBroadcastPushEnabled));    QTSSModuleUtils::GetAttribute(sPrefs, "max_broadcast_announce_duration_secs",   qtssAttrDataTypeUInt32,                                &sMaxBroadcastAnnounceDuration, &sDefaultMaxBroadcastAnnounceDuration, sizeof(sDefaultMaxBroadcastAnnounceDuration));    QTSSModuleUtils::GetAttribute(sPrefs, "allow_duplicate_broadcasts",     qtssAttrDataTypeBool16,                                &sAllowDuplicateBroadcasts, &sDefaultAllowDuplicateBroadcasts, sizeof(sDefaultAllowDuplicateBroadcasts));

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