{"id":660,"date":"2018-01-16T12:38:00","date_gmt":"2018-01-16T11:38:00","guid":{"rendered":"https:\/\/blog2.basyskom.com\/?p=660"},"modified":"2024-01-04T17:24:59","modified_gmt":"2024-01-04T16:24:59","slug":"want-to-give-qt-opcua-a-try","status":"publish","type":"post","link":"https:\/\/www.basyskom.de\/en\/want-to-give-qt-opcua-a-try\/","title":{"rendered":"Want to give Qt OpcUa a try?"},"content":{"rendered":"\t\t
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Update 02.03.2018:<\/strong> the steps outlined below have become outdated.
<\/span>Please see here<\/a><\/span> for up to date build steps.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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basysKom has initiated Qt OpcUa which is a module offering support for the industrial communication standard OPC UA. This module has been contribut<\/a>ed<\/a>\u00a0by us to the Qt Project.\u00a0The\u00a0Qt OpcUa\u00a0API wraps existing OPC UA implementations. Currently, implementations for freeopcua and\u00a0open62541<\/a>\u00a0are available.<\/p>

Qt OpcUa will become part of the Qt 5.11 release as a\u00a0Technology Preview. First\u00a0alpha builds<\/a>\u00a0will be available by the end of February 2018.\u00a0Qt 5.11 release is scheduled for end of May 2018.<\/p>

Why not try out the current state of Qt OpcUa right now?<\/h3>

We have been asked by a number of people how to get started already now. We will provide short howtos for Ubuntu, Windows-MinGW and Visual Studio 2017 in the following article.<\/p>

Two things are needed: Qt OpcUa itself and an OPC UA library. In this article, we use open62541 as it has very little dependencies (and is the more complete implementation anyway).<\/p>

The easiest approach to build Qt OpcUa is as a drop-in for Qt 5.10. This spares us from creating a full Qt build based on the current dev branch.<\/p>

The following recipes assume that you have\u00a0cmake, python\/pip, perl, git and other essential build tools installed. Paths used with the examples need to be adjusted to reflect your local situation.<\/p>

Installation on Linux<\/h3>

These steps have been tested on Ubuntu 16.04 but can be applied to a wide range of desktop distributions.<\/p>

$ sudo pip install six\n$ git clone https:\/\/github.com\/open62541\/open62541.git\n$ cd open62541\n$ git checkout 302003d\n$ mkdir build && cd build\n$ cmake -DBUILD_SHARED_LIBS=ON -DUA_ENABLE_AMALGAMATION=ON ..\n$ make\n$ sudo make install\n\n$ git clone http:\/\/code.qt.io\/qt\/qtopcua.git\n$ cd qtopcua\n$ mkdir build && cd build\n$ \/opt\/Qt5.10\/5.10.0\/gcc_64\/bin\/qmake .. # has open62541 been detected?\n$ make \n$ sudo make install<\/pre>
Installation on Windows (Visual Studio 2017)<\/h3>
Start by running the Qt 5.10.0 64-bit for Desktop (MSVC 2017)<\/em> shell\u00a0shipped with Qt (have a look at the “Start Menu”). Use this shell to issue the following commands:<\/p>
\"c:\\Program Files (x86)\\Microsoft Visual Studio\\2017\\WDExpress\\VC\\Auxiliary\\Build\\vcvarsx86_amd64.bat\"\npip install six\ngit clone\u00a0https:\/\/github.com\/open62541\/open62541.git\ncd open62541\ngit checkout 302003d\nmkdir build\ncd build\ncmake.exe -G \"NMake Makefiles\" -DUA_ENABLE_AMALGAMATION=ON ..\nnmake.exe\n\ngit clone http:\/\/code.qt.io\/qt\/qtopcua.git\ncd qtopcua\nmkdir build\ncd build\nset INCLUDE=%INCLUDE%;c:\\path\\to\\open62541\\build\nset LIB=%LIB%;c:\\path\\to\\open62541\\build\\bin\nqmake.exe ..    # has open62541 been detected?\nnmake.exe\nnmame.exe install<\/pre>
Above recipe will also work for Visual Studio 2015. 2013 is not supported (and will be dropped by Qt 5.11 anyways).<\/p>
Installation on Windows (MinGW as shipped with Qt 5.10)<\/h3>
Start by running the Qt 5.10.0 for Desktop (MinGW 5.3.0 32 bit)\u00a0<\/em>shell\u00a0shipped with Qt (have a look at the “Start Menu”). Use this shell to issue the following commands:<\/p>
pip install six\ngit clone https:\/\/github.com\/open62541\/open62541.git\ncd open62541\ngit checkout 302003d\nmkdir build\ncd build\ncmake.exe -G \"MinGW Makefiles\" -DUA_ENABLE_AMALGAMATION=ON ..\nmingw32-make.exe\n\ngit clone http:\/\/code.qt.io\/qt\/qtopcua.git\ncd qtopcua\nmkdir build\ncd build\nset CPLUS_INCLUDE_PATH=c:\\path\\to\\open62541\\build\nset LIBRARY_PATH=c:\\path\\to\\open62541\\build\\bin\nqmake.exe ..\nmingw32-make.exe\nmingw32-make.exe install<\/pre>
Usage<\/h3>
After successful completion of above steps Qt OpcUa will be available from your existing Qt5.10 installation. A documentation snapshot can be found here<\/a>.<\/p>
The following “Hello Qt OpcUa” example shows how to read an attribute from a server (add QT += opcua to your .pro).<\/p>
#include \n#include \n\nclass QOpcUaReader : public QObject\n{\nQ_OBJECT\n\npublic:\n    QOpcUaReader(QObject *parent);\n    bool init();\n    void handleStateChanged(QOpcUaClient::ClientState state);\n    void handleAttributeRead(QOpcUa::NodeAttributes attr);\n\nsignals:\n    void done();\n\nprivate:\n    QScopedPointer m_client;\n    QScopedPointer m_node;\n};\n\nQOpcUaReader::QOpcUaReader(QObject *parent)\n    : QObject(parent)\n{}\n\nbool QOpcUaReader::init()\n{\n    QOpcUaProvider p;\n    qDebug() << \"Available backends:\" << p.availableBackends();\n\n    if (p.availableBackends().size() == 0) {\n        qDebug() << \"No backends found\";\n        return false;\n    }\n\n    m_client.reset(p.createClient(p.availableBackends()[0]));\n\n    if (!m_client) {\n        qDebug() << \"Failed to create client\"; return false; } QObject::connect(m_client.data(), &QOpcUaClient::stateChanged, this, &QOpcUaReader::handleStateChanged); m_client->connectToEndpoint(QUrl(\"opc.tcp:\/\/opcua.demo-this.com:51210\/UA\/SampleServer\"));\n    return true;\n}\n\nvoid QOpcUaReader::handleStateChanged(QOpcUaClient::ClientState state)\n{\n    qDebug() << \"Client state changed:\" << state; switch(state) { case QOpcUaClient::ClientState::Connected: { m_node.reset(m_client->node(\"ns=0;i=84\"));\n        if (!m_node) {\n            qDebug() << \"Failed to get node\"; emit done(); break; } QObject::connect(m_node.data(), &QOpcUaNode::attributeRead, this, &QOpcUaReader::handleAttributeRead); m_node->readAttributes(QOpcUa::NodeAttribute::BrowseName);\n        break;\n    }\n    case QOpcUaClient::Disconnected: {\n        emit done();\n        break;\n    }\n    default:\n        break;\n    }\n}\n\nvoid QOpcUaReader::handleAttributeRead(QOpcUa::NodeAttributes attr)\n{\n    qDebug() << \"Signal for attributes:\" << attr; if (m_node->attributeError(QOpcUa::NodeAttribute::BrowseName) == QOpcUa::UaStatusCode::Good)\n        qDebug() << \"Browse name:\" << m_node->attribute(QOpcUa::NodeAttribute::BrowseName).value().name;\n    else\n        qDebug() << \"Failed to read attribute:\" << m_node->attributeError(QOpcUa::NodeAttribute::BrowseName);\n\n    m_client->disconnectFromEndpoint();\n}\n\nint main(int argc, char *argv[])\n{\n    QCoreApplication a(argc, argv);\n    QOpcUaReader reader(&a);\n    QObject::connect(&reader, &QOpcUaReader::done, &a, &QCoreApplication::quit);\n    if (!reader.init())\n        return 1;\n    return a.exec();\n}\n\n#include \"main.moc\"<\/pre>
Conclusion<\/h3>
Most of the API envisioned for the Technology Preview is available. We are currently busy testing and polishing, as well as adding more comprehensive examples and improving the documentation. Please leave a comment or get in contact with\u00a0us<\/a>\u00a0if you have any questions or comments – you still have the chance to influence the final shape of the API.<\/p>
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basysKom has initiated Qt OpcUa which is a module offering support for the industrial communication standard OPC UA. This module has been contributed\u00a0by us to the Qt Project.\u00a0The\u00a0Qt OpcUa\u00a0API wraps existing OPC UA implementations. Currently, implementations for freeopcua and\u00a0open62541\u00a0are available.<\/p>","protected":false},"author":2,"featured_media":1557,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[2,7,8],"tags":[124,15,123],"class_list":["post-660","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-general","category-qt","tag-opc-ua","tag-qt","tag-qt-opc-ua"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.basyskom.de\/en\/wp-json\/wp\/v2\/posts\/660","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.basyskom.de\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.basyskom.de\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.basyskom.de\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.basyskom.de\/en\/wp-json\/wp\/v2\/comments?post=660"}],"version-history":[{"count":11,"href":"https:\/\/www.basyskom.de\/en\/wp-json\/wp\/v2\/posts\/660\/revisions"}],"predecessor-version":[{"id":7481,"href":"https:\/\/www.basyskom.de\/en\/wp-json\/wp\/v2\/posts\/660\/revisions\/7481"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.basyskom.de\/en\/wp-json\/wp\/v2\/media\/1557"}],"wp:attachment":[{"href":"https:\/\/www.basyskom.de\/en\/wp-json\/wp\/v2\/media?parent=660"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.basyskom.de\/en\/wp-json\/wp\/v2\/categories?post=660"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.basyskom.de\/en\/wp-json\/wp\/v2\/tags?post=660"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}