client_browse.cpp

#include <iomanip>
#include <iostream>
#include <string_view>
 
#include <open62541pp/client.hpp>
#include <open62541pp/node.hpp>
 
/// Get name of node class.
constexpr std::string_view getEnumName(opcua::NodeClass nodeClass) {
    switch (nodeClass) {
    case opcua::NodeClass::Object:
        return "Object";
    case opcua::NodeClass::Variable:
        return "Variable";
    case opcua::NodeClass::Method:
        return "Method";
    case opcua::NodeClass::ObjectType:
        return "ObjectType";
    case opcua::NodeClass::VariableType:
        return "VariableType";
    case opcua::NodeClass::ReferenceType:
        return "ReferenceType";
    case opcua::NodeClass::DataType:
        return "DataType";
    case opcua::NodeClass::View:
        return "View";
    default:
        return "Unknown";
    }
}
 
// Separate definition for recursion
void printNodeTree(opcua::Node<opcua::Client>& node, int indent);
 
// Browse and print the server's node tree recursively:
// - Objects (Object)
//   - Server (Object)
//     - Auditing (Variable)
//     - ServiceLevel (Variable)
//     - NamespaceArray (Variable)
//     - ServerArray (Variable)
//     - ServerRedundancy (Object)
//       - RedundancySupport (Variable)
//     - VendorServerInfo (Object)
// ...
void printNodeTree(opcua::Node<opcua::Client>& node, int indent) {  // NOLINT
    for (auto&& child : node.browseChildren()) {
        std::cout << std::setw(indent) << "- " << child.readBrowseName().getName() << " ("
                  << getEnumName(child.readNodeClass()) << ")\n";
        printNodeTree(child, indent + 2);
    }
}
 
int main() {
    opcua::Client client;
    client.connect("opc.tcp://localhost:4840");
 
    opcua::Node nodeRoot(client, opcua::ObjectId::RootFolder);
 
    // Browse all nodes recursively and print node tree to console
    printNodeTree(nodeRoot, 0);
 
    // Browse a child node by its relative path using browse names
    auto nodeServer = nodeRoot.browseChild({{0, "Objects"}, {0, "Server"}});
    // Browse the parent node
    auto nodeServerParent = nodeServer.browseParent();
 
    std::cout << nodeServer.readDisplayName().getText() << "'s parent node is "
              << nodeServerParent.readDisplayName().getText() << "\n";
}