本文整理匯總了TypeScript中node-opcua.ClientSession.queryFirst方法的典型用法代碼示例。如果您正苦於以下問題：TypeScript ClientSession.queryFirst方法的具體用法？TypeScript ClientSession.queryFirst怎麽用？TypeScript ClientSession.queryFirst使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類node-opcua.ClientSession的用法示例。
在下文中一共展示了ClientSession.queryFirst方法的1個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的TypeScript代碼示例。
示例1: main
//.........這裏部分代碼省略.........
// -----------------------------------------------------------------------------------------------------------------
// enumerate all Condition Types exposed by the server
// -----------------------------------------------------------------------------------------------------------------
console.log("--------------------------------------------------------------- Enumerate all Condition Types exposed by the server");
const conditionTree = await enumerateAllConditionTypes(the_session);
console.log(treeify.asTree(conditionTree));
console.log(" -----------------------------------------------------------------------------------------------------------------");
// -----------------------------------------------------------------------------------------------------------------
// enumerate all objects that have an Alarm & Condition instances
// -----------------------------------------------------------------------------------------------------------------
const alarms = await enumerateAllAlarmAndConditionInstances(the_session);
console.log(" -------------------------------------------------------------- Alarms & Conditions ------------------------");
for (const alarm of alarms) {
console.log(
"parent = ",
chalk.cyan(w(alarm.parent.toString(), 30)),
chalk.green.bold(w(alarm.typeDefinitionName, 30)),
"alarmName = ",
chalk.cyan(w(alarm.browseName.toString(), 30)),
chalk.yellow(w(alarm.alarmNodeId.toString(), 40))
);
}
console.log(" -----------------------------------------------------------------------------------------------------------------");
// -----------------------------------------------------------------------------------------------------------------
// Testing if server implements QueryFirst
// -----------------------------------------------------------------------------------------------------------------
try {
console.log(" ---------------------------------------------------------- Testing QueryFirst");
const queryFirstRequest: QueryFirstRequestOptions = {
view: {
viewId: NodeId.nullNodeId
},
nodeTypes: [
{
typeDefinitionNode: makeExpandedNodeId("i=58"),
includeSubTypes: true,
dataToReturn: [{
attributeId: AttributeIds.AccessLevel,
relativePath: undefined
}]
}
]};
const queryFirstResult = await the_session.queryFirst(queryFirstRequest);
console.log(" -----------------------------------------------------------------------------------------------------------------");
} catch (err) {
console.log(" Server is not supporting queryFirst err=",err.message);
}
// create Read
if (doHistory) {
console.log(" ---------------------------------------------------------- History Read------------------------");
const now = Date.now();
const start = now - 1000; // read 1 seconds of history
const historicalReadResult = await the_session.readHistoryValue({
nodeId: monitored_node
}, new Date(start), new Date(now));