Application Permissions
Many features of today’s devices and operating systems can have significant privacy, security, and performance implications if misused. It’s therefore increasingly common for platforms to require explicit consent from the user before accessing these features.
The Qt permission APIs allow the application to check or request permission for such features in a cross platform manner.
Usage
A feature that commonly requires user consent is access to the microphone of the device. An application for recording voice memos would perhaps look something like this initially:
To ensure this application works well on platforms that require user consent for microphone access we would extend it like this:
We first check if we already know the status of the microphone permission. If we don’t we initiate a permission request to determine the current status, which will potentially ask the user for consent. We connect the result of the request to the slot we’re already in, so that we get another chance at evaluating the permission status.
Once the permission status is known, either because we had been granted or denied permission at an earlier time, or after getting the result back from the request we just initiated, we redirect the user to a dialog explaining why we can not record voice memos at this time (if the permission was denied), or proceed to using the microphone (if permission was granted).
The use of the QT_CONFIG(permissions) macro ensures that the code will work as before on platforms where permissions are not available.
Note: On macOS and iOS permissions can currently only be requested for GUI applications.
Declaring Permissions
Some platforms require that the permissions you request are declared up front at build time.
Apple platforms
Each permission you request must be accompanied by a so called usage description string in the application’s Info.plist file, describing why the application needs to access the given permission. For example:
The relevant usage description keys are described in the documentation for each permission type.
Android
Each permission you request must be accompanied by a uses-permission entry in the application’s AndroidManifest.xml file. For example:
The relevant permission names are described in the documentation for each permission type.
Available Permissions
The following permissions types are available:
Access Bluetooth peripherals
Access the user’s calendar
Access the camera for taking pictures or videos
Access the user’s contacts
Access the user’s location
Access the microphone for monitoring or recording sound
Best Practices
To ensure the best possible user experience for the end user we recommend adopting the following best practices for managing application permissions:
- Request the minimal set of permissions needed. For example, if you only need access to the microphone, do not request camera permission just in case. Use the properties of individual permission types to limit the permission scope even further, for example QContactsPermission::setReadOnly() to request read only access.
- Request permissions in response to specific actions by the user. For example, defer requesting microphone permission until the user presses the button to record audio. Associating the permission request to a specific action gives the user a clearer context of why the permission is needed. Do not request all needed permission on startup.
- Present extra context and explanation if needed. Sometimes the action by the user is not enough context. Consider presenting an explanation-dialog after the user has initiated the action, but before requesting the permission, so the user is aware of what’s about to happen when the system permission dialog subsequently pops up.
- Be transparent and explicit about why permissions are needed. In explanation dialogs and usage descriptions, be transparent about why the particular permission is needed for your application to provide a specific feature, so users can make informed decisions.
- Account for denied permissions. The permissions you request may be denied for various reasons. You should always account for this situation, by gracefully degrading the experience of your application, and presenting clear explanations the user about the situation.
- Never request permissions from a library. The request of permissions should be done as close as possible to the user, where the information needed to make good decisions on the points above is available. Libraries can check permissions, to ensure they have the prerequisites for doing their work, but if the permission is undetermined or denied this should be reflected through the library’s API, so that the application in turn can request the necessary permissions.
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Не получается собрать проект
Не получается собрать проект
У меня Linux В качестве оболочки использую bash В системе установлено три версии Qt (3,4,5.5).
Не получается собрать проект в QtCreator
В общем не собираются проекты. По поводу ошибки на первом скрине нашел ответ тут -.
Не могу собрать проект
Помогите, пожалуйста, собрать проект в QT. С QT ни разу не работал. P.S. как сделать, чтобы QT.
Как собрать проект?
Доброго времени суток. Вот у меня есть папка с проектом. Я открываю .pro, проходит разбор и.
Пытаюсь собрать проект
Пытаюсь собрать проект Quatum_gis в QT Creator. выдает такую ошибку. Создается библиотека.
Собрать проект статической сборкой Qt
Соберите пожалуйста проект в статической сборке, у меня всю ночь создавалась статическая сборка и в.
Не удаётся собрать проект в Qt-Creatore
Привет всем. На днях установил ALT Linux. Вместе с ней был установлен Qt-Creator. Во время работы.
QT с бд MYSQL Как собрать проект в релизе
Вопрос такой- есть приложение, которое работает с базой данных MySql, можно ли как-то собрать это.
Qt creator cannot open output file permission denied
Check the Event Viewer under Applications and Services Logs -> Microsoft -> Windows -> UacFileVirtualization -> Operational. Solution 2: You need to acquire sufficient user access rights (ie "Run as Administrator") to write to such folders in Windows Vista+.
Cannot open output file, permission denied
Solution 1:
check that "filename.exe" is not running, I guess you are using Microsoft Windows, in that case you can use either Task Manager or Process Explorer : http://technet.microsoft.com/en-us/sysinternals/bb896653 to kill "filename.exe" before trying to generate it.
Solution 2:
I have encountered the same problem you have. I found that it may have some relationship with the way you terminate your run result. When you run your code, whether it has a printout, the debugger will call the console which print a "Press any key to continue. ". If you terminate the console by pressing key, it's ok; if you do it by click the close button, the problem comes as you described. When you terminate it in the latter way, you have to wait several minutes before you can rebuild your code.
Solution 3:
I just had the same issue. And i experienced that it always happens when i run the programm and change some code without finishing the programm still running. After that the "cannot open . " message appears.
However i got rid of it by clicking the "Terminate" button at the very top-right side of the console window (red button) and after that "remove all terminated launches" (two x'es right next to the terminate button). This seems to close the running programm and everything works fine after 🙂 hope this may help anyone
Qt WinRT App cannot access file permission denied
Solution:
Try to add a file protocol to the manifest page, contains your file extension you want to access/ create or play with..
for example, .xml, .txt, .etc..
I always face this 'unknown' error when try to access files without adding the ext file protocol..
UPDATE: More Information: https://msdn.microsoft.com/library/windows/apps/hh464906.aspx#file_activation
Do it by: Package.appxmanifest > Declarations > Add a 'File Type Association' > your type name and ext. is required.
Example in a code:
Qt cannot cannot create/write to C:\
Solution 1:
Have you checked whether the file isn't created in the VirtualStore for that user? Check the Event Viewer under Applications and Services Logs -> Microsoft -> Windows -> UacFileVirtualization -> Operational. If you see entries with event ID 5000, a FileCreateVirtualExclude event has occurred.
Check if the file didn't get created under %USERPROFILE%\AppData\Local\VirtualStore . If it did, you might need to embed a manifest requesting the required privileges (i.e., turning virtualization off.)
For more details, see New UAC Technologies for Windows Vista (scroll down and look for Virtualization.)
Solution 2:
You need to acquire sufficient user access rights (ie "Run as Administrator") to write to such folders in Windows Vista+. Either start the app as administrator, or ask for Administrator rights via a call to WinAPI.
Solution 3:
QFile may be giving you an error code, but you've failed to check for it.
You should do something more like:
You've checked the return value of QFile::error , but only before calling open — you need to check after the open attempt.
Qt creator cannot upload files onto the remote device
Solution 1:
check /home/root folders can have rights to access by using command (ls -l)
Solution 2:
I just found out the problem has nothing to do with ssh or access right.
It is because i have added more than one linux generic devices, but i'm using the kit for the project with selecting the wrong device.
Решенные QtCreator Permission Denied to File
Hi! I have a fresh installation of Qt and im using it to program a Grayhill 3d70 touchscreen. Until now i followed Grayhill’s guide, and everything went OK, except that in the 3rd of 5 step of the Deployment QtCreator pops a message saying:
I tried to change app permissions and to run it as administrator, but no luck. Any help is greatly appreciated!
Is it possible that this file already exists and is open?
@jsulm I dont think so. It is a file created by Qt itself amd im not really sure about its use(i can’t find it in the folder it says it is,probably it is created for a short amount of time?). The point is, that the permission thing happens and in different circumstances: when i tried to configure SSH connectivity, I found the openssh .exe files inside Windows/System32/OpenSSH I copied and pasted the exact file paths in Qt Settings, and it says the files and folders do not exist. Also, when I try to browse the System32 directory from within the Qt Settings, I can see seemingly all directories except OpenSSH(but it is clearly there, I checked many times).
As a fix, I tried to copy the ssh .exe files on a new folder I created on my desktop, and boom, it worked fine.
Thats the reason I suspect it has to do with application permissions. I might be wrong, but for now its my best guess and I cant solve it.
which Creator version is that?
There has been some issues with deployment on Windows recently, the last I remember was https://bugreports.qt.io/browse/QTCREATORBUG-23269
It seems your issue is related, so you might want to comment on that bugreport.