My Qt 5.9 program (on X11 Linux) launches other applications, using QProcess.
I would like to have control over windows these applications spawn, so I obtain their winId value and use QWindow::fromWinId to get a QWindow instance.
The problem is these instances are invalid and do not represent the window they are supposed to.
If I check the winId values using xwininfo, the correct information is returned, so I know they are good.
What am I doing wrong?
Edit: An example won't help much, but here goes:
QProcess *process=new QProcess(this);
...
process.open()
... // wait until window appears
WId winId=PidToWid(process->processId()); // this function returns the Window ID in decimal format. I test this with xwininfo, it's always correct
...
QWindow *appWindow=QWindow::fromWinId(winId);
... And that's basically it. appWindow is a valid QWindow instance, but it does not relate to the actual window in any way. For example, if I close() it, it returns true but the window does not close.
Even if I provide a wrong WId on purpose, the end result is the same.
This is not proper solution with explanation why it should work, however it may be helpful for somebody...
I had the same issue with my application when I switched from Qt4 QX11EmebeddedContainer to Qt5 implementation using QWindow. What I did to resolve / fix this issue was following:
Client application:
widget->show(); //Widget had to be shown
widget->createWinId();
sendWinId(widget->winId()); //Post window handle to master app where is constructed container
Master application:
QWindow* window = QWindow::fromWinId(clientWinId);
window->show(); //This show/hide toggle did trick in combination with show in client app
window->hide();
QWidget* container = QWidget::createWindowContainer(window, parentWindowWidget);
After this I was able to control window properly through QWidget container.
Related
Clueless dude here that does not get any results with anything in neutralino except HTML and CSS mods.
I have to neu build because CheckNetIsolation does nothing on my x64 Windows 10 Pro machine. So I can run the "myApp" executable. While that's annoying my real problem is I can't get any js code to produce results.
For example I enter Neutralino.window.move(0,0); immediately before Neutralino.init(); in VSCode. The window opens and remains in its default location.
What's my problem?
Check your neutralino.config.json file. In the latest version of Neutralino, enableHTTPServer has been replaced with just enableServer.
My Neu App remained while as well, until I did that.
Also, ensure that you have VSCode installed.
Finally, according to the documentation (scroll down to DANGER):
Aways use the ready event to call native API functions immediately. Don't call native API functions before the init() call or right after the init() call because the init() function doesn't synchronously wait until the WebSocket connection is established.
You need to call Neutralino.init() before any other functions, and since you need to move the window immediately, place it within the ready event:
Neutralino.init();
Neutralino.events.on('ready', () => {
Neutralino.window.move(0, 0);
});
I hope all this helps.
I'm trying to make a game (Universal DX11 application) and at some point I need access to image library to allow user to select avatar. But for some reason call of PickSingleFileAsync on picker rises an exception.
Windows::Storage::Pickers::FileOpenPicker^ openPicker = ref new Windows::Storage::Pickers::FileOpenPicker();
openPicker->SuggestedStartLocation = Windows::Storage::Pickers::PickerLocationId::PicturesLibrary;
openPicker->ViewMode = Windows::Storage::Pickers::PickerViewMode::Thumbnail;
// Filter to include a sample subset of file types.
auto filters = openPicker->FileTypeFilter;
filters->Clear();
filters->Append(".png");
openPicker->PickSingleFileAsync();// same exception with create_task(...);
Seems like the sample works only if I put it into UI thread. How can I use picker from my own thread?
UPD: HRESULT:0x80004005
Ok, I just decided to call dipatcher's RunAsync to execute this code. But I still have no idea why I cannot open picker inside non-UI thread.
I am using Flash builder actionscript 3 Flex mobile.
I have a very heavy function that loads data from the local device and creates many graphic elements. While this function runs, the device freezes for 6 seconds or so.
I want to show a progress bar and let the device continue working, is there any way I can use threading to do this ? Other ideas are also welcome.
Thanks, Koby.
You know that at which function application getting freeze. Before that function call a progress bar. Create a progress bar in a pop up mode & call it. After 6 seconds(Not recommended) or getting the data just call removeallpopups() method. So now you can set the label in progress bar as "Loding..."
Sample code
<mx:ProgressBar id="sampleProgressBar" styleName="Calib16Blue"
indeterminate="true" labelPlacement="left"
label="{theMessage}"/>
Call this mxml by creating a pop up.
To do 'proper' muiltithreading you need to use the Worker Class (Documentation here), however the SQLConnection class and FileStream class have asynchronous methods that fit into the normal Actionscript event listener cycle and operate in "the background". Allowing the rest of the app to load when they're still pending.
This is in response to dan's (dan^spotify on IRC) offer to take a look at my testcase, but I post it here in case anyone has encountered similar issues.
I'm experiencing a problem with libspotify where the application crashes (memory access violation) in both of these two scenarios:
the first sp_session_process_events (triggered by notify main thread callback) that's called after the sp_session_logout() function is called crashes the application
skipping logout and calling sp_session_release() crashes the application
I've applied sufficient synchronization from the session callbacks, and I'm otherwise operating on a single thread.
I've made a small testcase that does the following:
Creates session
Logs in
Waits 10 seconds
Attempts to logout, upon which it crashes (when calling sp_session_process_events())
If it were successful in logging out (which it isn't), would call sp_session_release()
I made a Gist for the testcase. It can be found here: https://gist.github.com/4496396
The test case is made using Qt (which is what I'm using for my project), so you'd need Qt 5 to compile it. I've also only written it with Windows and Linux in mind (don't have Mac). Assuming you have Qt 5 and Qt Creator installed, the instructions are as follows:
Download the gist
Copy the libspotify folder into the same folder as the .pro file
Copy your appkey.c file into the same folder
Edit main.cpp to login with your username and password
Edit line 38-39 in sessiontest.cpp and set the cache and settings path to your liking
Open up the .pro file and run from Qt Creator
I'd be very grateful if someone could tell me what I'm doing wrong, as I've spent so many hours trying anything I could think of or just staring at it, and I fear I've gone blind to my own mistakes by now.
I've tested it on both Windows 7 and Linux Ubuntu 12.10, and I've found some difference in behavior:
On Windows, the testcase crashes invariably regardless of settings and cache paths.
On Linux, if setting settings and cache to "" (empty string), logging out and releasing the session works fine.
On Linux, if paths are anything else, the first run (when folder does not already exist) logs out and releases session as it should, but on the next run (when folder already exists), it crashes in the exact same way as it does on Windows.
Also, I can report that sp_session_flush_caches() does not cause a crash.
EDIT: Also, hugo___ on IRC was kind enough to test it on OSX for me. He reported no crashes despite running the application several times in a row.
While you very well may be looking at a bug in libspotify, I'd like to point out a possibly redundant call to sp_session_process_events(), from what I gathered from looking at your code.
void SessionTest::processSpotifyEvents()
{
if (m_session == 0)
{
qDebug() << "Process: No session.";
return;
}
int interval = 0;
sp_session_process_events(m_session, &interval);
qDebug() << interval;
m_timerId = startTimer(interval);
}
It seems this code will pickup the interval value and start a timer on that to trigger a subsequent call to event(). However, this code will also call startTimer when interval is 0, which is strictly not necessary, or rather means that the app can go about doing other stuff until it gets a notify_main_thread callback. The docs on startTimer says "If interval is 0, then the timer event occurs once every time there are no more window system events to process.". I'm not sure what that means exactly but it seems like it can produce at least one redundant call to sp_session_process_events().
http://qt-project.org/doc/qt-4.8/qobject.html#startTimer
I notice that you will get a crash on sp_session_release if you have a track playing when you call it.
I have been chasing this issue today. Login/logout works just fine on Mac, but the issue was 100% repeatable as you described on Windows.
By registering empty callbacks for offline_status_updated and credentials_blob_updated, the crash went away. That was a pretty unsatisfying fix, and I wonder if any libspotify developers want to comment on it.
Callbacks registered in my app are:
logged_in
logged_out
notify_main_thread
log_message
offline_status_updated
credentials_blob_updated
I should explicitly point out that I did not try this on the code you supplied. It would be interesting to know if adding those two extra callbacks works for you. Note that the functions I supply do absolutely nothing. They just have to be there and be registered when you create the session.
Adding the following call in your "logged in" libspotify callback seems to fix this crash as detailed in this SO post:
sp_session_playlistcontainer(session);
I've embedded an nsIWebBrowser in my application. Because I'm just generating HTML for it on the fly, I'm using OpenStream, AppendToStream, and CloseStream to add content. What I need is to add event listeners for mouse movement over the web browser as well as mouse clicks. I've read documentation and tried lots of different things, but nothing I have tried has worked. For instance, the code below would seem to do the right thing, but it does nothing:
nsCOMPtr<nsIDOMWindow> domWindow;
mWebBrowser->GetContentDOMWindow(getter_AddRefs(domWindow));
if (!mEventTarget) {
mEventTarget = do_QueryInterface(domWindow);
if (mEventTarget)
mEventTarget->AddEventListener(NS_LITERAL_STRING("mouseover"), (nsIDOMEventListener *)mEventListener, PR_FALSE);
}
Perhaps it isn't working because this is run during initialization, but before any content is actually added. However, if I add it during AppendStream, or CloseStream, it segfaults.
Please tell me a straightforward way to do this.
Well, here's the answer:
nsCOMPtr<nsIDOMEventTarget> cpEventTarget;
nsCOMPtr<nsIDOMWindow> cpDomWin;
m_pWebBrowser->GetContentDOMWindow (getter_AddRefs(cpDomWin));
nsCOMPtr<nsIDOMWindow2> cpDomWin2 (do_QueryInterface (cpDomWin));
cpDomWin2->GetWindowRoot(getter_AddRefs(cpEventTarget));
rv = cpEventTarget->AddEventListener(NS_LITERAL_STRING("mousedown"),
m_pBrowserImpl, PR_FALSE);