Hi Mikhail,
1. The results of your processing should be returned in matchesFor() function,
as a return value. Please note, that this function is invoked in non-main
thread.
2. Right, you should create network manager and requests for it in the same
thread, as well as reading from replies should be done in the same thread.
There is also a helpful virtual method of ILocatorFilter: prepareSearch(),
which is invoked in the main thread, and it's being guaranteed that it will
always precede a call to matchesFor() in other thread (matchesFor() will be
called after prepareSearch() has finished). I think that something similar to
your case is done inside WorkspaceLocatorFilter. The prepareSearch() could
start the QNetworkRequest and connect to its QNetworkReply::finished signal,
when the signal comes we collect the result and mark the flag, meaning we have
received the reply. This would be main thread. And matchesFor() could just
check if the flag was set - in this case we return the result collected in main
thread, otherwise we wait for it with additional event loop.
Jarek
________________________________________
From: Qt-creator <qt-creator-boun...@qt-project.org> on behalf of Mikhail
Bryukhovets <push....@gmail.com>
Sent: Sunday, March 7, 2021 11:16 AM
To: qt-creator@qt-project.org
Subject: [Qt-creator] Getting results from network in LocatorFilter
Hello!
I am trying to add suggestions functionality to my QtCerator plugin: When user
types search request in the locator there will be a displayed list of suggested
search queries based on entered text. Similar as it is done in browsers or
search engines. Suggestions are obtained from network as results of GET
requests to remote server. For example:
QNetworkRequest request;
request.setUrl(QUrl::fromUserInput("https://example.com/user_input?action=suggest";));
auto reply = network_manager_.get(request);
QObject::connect(reply, &QNetworkReply::readyRead, [&](){
qDebug() << "reply:" << reply->readAll();
});
So as I understand it I should make a network request inside matchesFor()
function of my class derived from Core::ILocatorFilter.
The first issue is: How and where do I obtain a result of a request to return
it to the user?
The second is: It seems that QNetworkAccessManager can't process
QNetworkRequest created in another thread (QObject: Cannot create children for
a parent that is in a different thread.
(Parent is QNetworkAccessManager(0x163c4d0), parent's thread is
QThread(0x6cc0d0), current thread is QThread(0x28b5810))
I didn't find similar cases in plugins provided with QtCreator so I hope
someone can point me in the right direction.
Mikhail.
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