EndpointDiscovery QML Type▲
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Import Statement: import QtOpcUa
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Since:: QtOpcUa 5.13
Detailed Description▲
Allows to fetch and access information about available endpoints on a server.
QtOpcUa.Connection {
id: connection
backend: availableBackends[0]
defaultConnection: true
}
QtOpcUa.ServerDiscovery {
discoveryUrl: "opc.tcp://127.0.0.1:43344"
onServersChanged: {
if (status.isGood) {
if (status.status == QtOpcUa.Status.GoodCompletesAsynchronusly)
return; // wait until finished
if (count > 0) {
// choose right server
endpointDiscovery.serverUrl = at(0).discoveryUrls[0];
console.log("Using server URL:", endpointDiscovery.serverUrl);
} else {
// no servers retrieved
}
} else {
// Fetching servers failed
console.log("Error fetching server:", servers.status.status);
}
}
}
QtOpcUa.EndpointDiscovery {
id: endpointDiscovery
onEndpointsChanged: {
if (status.isGood) {
if (status.status == QtOpcUa.Status.GoodCompletesAsynchronusly)
return; // wait until finished
if (count > 0) {
// choose right endpoint
console.log("Using endpoint", at(0).endpointUrl, at(0).securityPolicy);
connection.connectToEndpoint(at(0));
} else {
// no endpoints retrieved
}
} else {
// Fetching endpoints failed
console.log("Error fetching endpoints:", status.status);
}
}
}Property Documentation▲
connection : Connection▲
The connection to be used for requesting information.
If this property is not set, the default connection will be used, if any.
See Also▲
See also Connection, Connection::defaultConnection
count : int▲
Current number of endpoints in this element. Before using any data from an endpoint discovery, you should check status if the information was successfully retrieved.
See Also▲
serverUrl : string▲
Discovery URL of the server to fetch the endpoints from. Every time the URL is changed, a request to the given server is started.
When starting the request, the list of available endpoints is cleared and the status is set to Status.GoodCompletesAsynchronously. Once the request is finished, status changes.
Make sure to check status before accessing the list of endpoints.
See Also▲
See also endpointsChanged
status : Status▲
The current status of this element. In case the last retrieval of endpoints was successful, the status is Status.Good.
if (endpoints.status.isGood) {
// do something
} else {
// handle error
}See Also▲
See also Status
Signal Documentation▲
endpointsChanged()▲
Emitted when a retrieval request started, finished or failed. In a called function, you should first check the status of the object. If the status is Status.GoodCompletesAsynchronously, the request is still running. If the status is Status.Good, the request has finished and the endpoint descriptions can be read. If the status is not good, an error happened and status contains the returned error code.
onEndpointsChanged: {
if (endpoints.status.isGood) {
if (endpoints.status.status == QtOpcua.Status.GoodCompletesAsynchronusly)
return; // wait until finished
if (endpoints.count > 0) {
var endpointUrl = endpoints.at(0).endpointUrl();
console.log(endpointUrl);
}
} else {
// handle error
}
}The corresponding handler is onEndpointsChanged.
See Also▲
See also status, count, at, Status, EndpointDescription
Method Documentation▲
EndpointDescription at(index)▲
Returns the endpoint description at given index. In case there are no endoints available or the index is invalid, an invalid endpoint description is returned. Before using any data from this, you should check status if retrieval of the information was successful.
if (endpoints.status.isGood) {
if (endpoints.count > 0)
var endpointUrl = endpoints.at(0).endpointUrl();
console.log(endpointUrl);
} else {
// handle error
}See Also▲
See also count, status, EndpointDescription