Access denied finding property "vendor.camera.aux.packagelist"

[Ivelin]

Hello,

I am trying to build an app in which when you type an incorrect password a picture of the front camera is being made. I have written everything, but something with the permissions seems off.

When I try to take a picture I get

01-26 17:27:19.887 32022 32022 W libc    : Access denied finding property "vendor.camera.aux.packagelist"
01-26 17:27:19.888 32022 32022 W libc    : Access denied finding property "vendor.camera.aux.packagelist.ext"
01-26 17:27:19.906 32022 32022 W libc    : Access denied finding property "vendor.camera.aux.packagelist"
01-26 17:27:19.906 32022 32022 W libc    : Access denied finding property "vendor.camera.aux.packagelist.ext"
01-26 17:27:19.982 32022 32228 W libc    : Access denied finding property "vendor.camera.aux.packagelist"
01-26 17:27:19.982 32022 32228 W libc    : Access denied finding property "vendor.camera.aux.packagelist.ext"
01-26 17:27:20.000 32022 32228 D CameraExtStub: init android.hardware.camera2.impl.CameraExtImplXiaoMi
01-26 17:27:20.330 32022 32228 W BpBinder: Slow Binder: BpBinder transact took 309 ms, interface=android.hardware.ICameraService, code=3 oneway=false
01-26 17:27:20.340 32022 32228 W libc    : Access denied finding property "vendor.camera.aux.packagelist"
01-26 17:27:20.341 32022 32228 W libc    : Access denied finding property "vendor.camera.aux.packagelist.ext"
01-26 17:27:20.386 32022 32022 W libc    : Access denied finding property "vendor.camera.aux.packagelist"
01-26 17:27:20.386 32022 32022 W libc    : Access denied finding property "vendor.camera.aux.packagelist.ext"
01-26 17:27:20.393 32022 32243 W libc    : Access denied finding property "vendor.camera.aux.packagelist"
01-26 17:27:20.393 32022 32243 W libc    : Access denied finding property "vendor.camera.aux.packagelist.ext"
01-26 17:27:20.430 32022 32243 W libc    : Access denied finding property "vendor.camera.aux.packagelist"
01-26 17:27:20.430 32022 32243 W libc    : Access denied finding property "vendor.camera.aux.packagelist.ext"
01-26 17:27:20.480 32022 32257 W libc    : Access denied finding property "vendor.camera.aux.packagelist"
01-26 17:27:20.480 32022 32257 W libc    : Access denied finding property "vendor.camera.aux.packagelist.ext"
01-26 17:27:20.528 32022 32257 W libc    : Access denied finding property "vendor.camera.aux.packagelist"
01-26 17:27:20.528 32022 32257 W libc    : Access denied finding property "vendor.camera.aux.packagelist.ext"
01-26 17:27:23.112 32022 32022 I ForceDarkHelperStubImpl: setViewRootImplForceDark: false for org.qtproject.example

Here are my files:

AndroidManifest.xml

<?xml version="1.0"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="org.qtproject.example.androidnotifier"
    android:installLocation="auto"
    android:versionCode="1"
    android:versionName="1.0">

    <!-- The comment below will be replaced with dependencies permissions upon deployment.
             Remove the comment if you do not require these default permissions. -->
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

    <!-- The comment below will be replaced with dependencies permissions upon deployment.
                      Remove the comment if you do not require these default features. -->

   <!--PERMISSIONS I HAVE WRITTEN FOR CAMERA-->
    <uses-feature android:name="android.hardware.camera" android:required="true" />  
    <uses-permission android:name="android.permission.CAMERA" />

    <supports-screens
        android:anyDensity="true"
        android:largeScreens="true"
        android:normalScreens="true"
        android:smallScreens="true" />
    <application
        android:name="org.qtproject.qt.android.bindings.QtApplication"
        android:extractNativeLibs="true"
        android:label="Qt Notifier"
        android:requestLegacyExternalStorage="true"
        android:icon="@drawable/icon">
        <activity
            android:name="org.qtproject.example.androidnotifier.MyActivity"
            android:configChanges="orientation|uiMode|screenLayout|screenSize|smallestScreenSize|layoutDirection|locale|fontScale|keyboard|keyboardHidden|navigation|mcc|mnc|density"
            android:label="Qt Notifier"
            android:launchMode="singleTop"
            android:screenOrientation="unspecified">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>

            <meta-data
                android:name="android.app.lib_name"
                android:value="-- %%INSERT_APP_LIB_NAME%% --" />

            <meta-data
                android:name="android.app.extract_android_style"
                android:value="none" />

        </activity>

        <receiver android:name="org.qtproject.example.androidnotifier.DemoDeviceAdminReceiver"
            android:permission="android.permission.BIND_DEVICE_ADMIN"
            android:exported="true">

            <meta-data
                android:name="android.app.device_admin"
                android:resource="@xml/device_admin_sample" />
            <intent-filter>
                <action android:name="android.app.action.DEVICE_ADMIN_ENABLED" />
            </intent-filter>
        </receiver>
    </application>
</manifest>

device_admin_sample.xml

<?xml version="1.0" encoding="utf-8"?>
<device-admin >
    <uses-policies>
        <limit-password />
        <watch-login />
    </uses-policies>
</device-admin>

main.cpp

bool checkPermission()
{
    auto r = QtAndroidPrivate::checkPermission(QtAndroidPrivate::Camera).result();
    if (r == QtAndroidPrivate::Denied)
    {
        r = QtAndroidPrivate::requestPermission(QtAndroidPrivate::Camera).result();
        if (r == QtAndroidPrivate::Denied)
            return false;
    }
    return true;
}

bool checkPermission1()
{
    auto r = QtAndroidPrivate::checkPermission(QtAndroidPrivate::Storage).result();
    if (r == QtAndroidPrivate::Denied)
    {
        r = QtAndroidPrivate::requestPermission(QtAndroidPrivate::Storage).result();
        if (r == QtAndroidPrivate::Denied)
            return false;
    }
    return true;
}

#ifdef __cplusplus
extern "C"
{
#endif

    JNIEXPORT void JNICALL Java_org_qtproject_example_androidnotifier_MyJavaNatives_passwordCallback(JNIEnv env, jobject obj, jint n)
    {

        QCamera *camera = new QCamera;
        QMediaCaptureSession m_captureSession;
        QImageCapture *m_imageCapture;

        camera = new QCamera(QMediaDevices::defaultVideoInput());
        m_captureSession.setCamera(camera);

        m_imageCapture = new QImageCapture;
        m_captureSession.setImageCapture(m_imageCapture);

        camera->start();
        m_imageCapture->captureToFile("/storage/emulated/0/Download/qt.jpeg");

        delete camera;
        delete m_imageCapture;
    }

#ifdef __cplusplus
}
#endif

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    checkPermission();
    checkPermission1();

    return a.exec();
}

I am using JNI ( Java Native Interface ), so when my password is written incorrectly Java_org_qtproject_example_androidnotifier_MyJavaNatives_passwordCallback gets called.

When I load my app I get 2 pop ups to grant the permission shows and I accept them.

When I type my password incorrectly it goes in the function that is expected to take a picture, but I get the errors I have provided at the top of the post, even though I have the necessary permissions.

Why is that ? I have written the necessary permissions in the AndroidManifest file and I do request them at run time. Could someone help me figure out what is wrong ?

[Ivelin]

Hello, I have tried a simpler codebase.

Currently I have main.cpp

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    checkPermission();
    checkPermission1();

    QCamera *camera = new QCamera;
    QMediaCaptureSession m_captureSession;
    QImageCapture *m_imageCapture;

    camera = new QCamera(QCameraDevice::FrontFace);
    m_captureSession.setCamera(camera);

    m_imageCapture = new QImageCapture;
    m_captureSession.setImageCapture(m_imageCapture);

    camera->start();
    int id = m_imageCapture->captureToFile("/storage/emulated/0/Download/f.jpeg");

    qDebug() << "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAa";

    return a.exec();
}

on Xiaomi Redmi Note 11 Pro 5G I get the very same error, but on Samsung A71 I don't have any errors, but the file still doesn't get saved.

Could someone please help me find out why that is ? What's the solution of this ?

[jsulm]

@Ivelin said in Access denied finding property "vendor.camera.aux.packagelist":

camera->start();
int id = m_imageCapture->captureToFile("/storage/emulated/0/Download/f.jpeg");

I guess you need to wait for camera to actually start (maybe https://doc.qt.io/qt-6/qcamera.html#active-prop)?

[Ivelin]

@jsulm, I suppose not because camera->isActive() returns true (before I call the capture method)!

It should be something else we are talking about.

Could you please advice something I've been stuck here for 3-4 days now..

[Ivelin]

@jsulm, hello again.

Thankfully to your suggestion I've been able to get somewhere!

Here's what I have now

main.cpp

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    checkPermission();
    checkPermission1();

    QWidget widget;
    QPushButton btn;
    btn.setMinimumSize(QSize(200, 200));
    btn.setText("Take a picutre");

    QVBoxLayout layout;
    layout.addWidget(&btn);
    widget.setLayout(&layout);

    QCamera *camera = new QCamera;
    QMediaCaptureSession m_captureSession;
    QImageCapture *m_imageCapture;

    camera = new QCamera(QCameraDevice::FrontFace);
    m_captureSession.setCamera(camera);

    m_imageCapture = new QImageCapture;
    m_captureSession.setImageCapture(m_imageCapture);

    camera->start();

    QObject::connect(&btn, &QPushButton::clicked, [m_imageCapture, camera]()
                     {
                         qDebug() << camera->isActive() << " " << m_imageCapture->isReadyForCapture();
                         int id = m_imageCapture->captureToFile("/storage/emulated/0/Download/f.jpeg"); });

    widget.show();
    return a.exec();
}

The interesting part in this code is the qDebug outout for camera->isActive() and m_imageCapture->isReadyForCapture()!

camera->isActive() is true, but m_imageCature->isReadyForCapture() is false.

However, I have no idea why ?

Could someone take a look ? Why is m_imageCapture->isReadyForCapture() false ? How can I fix it?

[jsulm]

@Ivelin Connect a slot to https://doc.qt.io/qt-6/qimagecapture.html#readyForCaptureChanged - is it called?
You can also check https://doc.qt.io/qt-5/qcamera.html#captureMode-prop

[Ivelin]

@jsulm, no it is not being called. Seems like a bug?

    QMediaCaptureSession m_captureSession;
    QImageCapture *m_imageCapture = new QImageCapture;

    camera = new QCamera(QCameraDevice::FrontFace);
    m_captureSession.setCamera(camera);

    m_captureSession.setImageCapture(m_imageCapture);

    camera->start();

    if (!m_imageCapture->isReadyForCapture())
    {
        qDebug() << "Camera is not ready for capture";
    }

    QObject::connect(&btn, &QPushButton::clicked, [m_imageCapture, camera]()
                     {
                         qDebug() << camera->isActive() << " " << m_imageCapture->isReadyForCapture();
                         int id = m_imageCapture->captureToFile("/storage/emulated/0/Download/f.jpeg"); });

    QObject::connect(m_imageCapture, &QImageCapture::readyForCaptureChanged, []()
                     { qDebug() << "READYYYYYYYYYYYYYYYYYY"; });

There is no "READYYYYYYYYYYYYYYYYYY" in my logs. I have tried both on Xiaomi and Samsung.

[jsulm]

@Ivelin What Qt version do you use? Try with the latest one.

[Ivelin]

@jsulm, I am using Qt 6.2.4.

I try to stick to something older, so there is lower chance for bugs, unfortunately this doesn't seem to be the case, so I will try the latest one.

[jsulm]

@Ivelin said in Access denied finding property "vendor.camera.aux.packagelist":

I try to stick to something older, so there is lower chance for bugs

Bugs get fixed in newer versions (of course new bugs are also introduced :-)).

[Ivelin]

@jsulm, hello

Late update. It is not the version I am pretty sure.

The Qt 6.2 example for camera works just fine, so it must be something from my code.

Yes, I am still banging my head, so I can fix that problem. it is been a week now I am getting pretty desperate

The problem must be in the code.

Could someone please help me ? Any Ideas ?

[Ivelin]

I also went over the whole documentation, but still can't see where is the problem in this simple code..

[JoeCFD]

@Ivelin QMultimedia module was reworked in Qt6. Better to use the latest version of Qt6.

[Ivelin]

@JoeCFD, I am going to try With Qt 6.6 ( latest current ), but again the qt camera example for qt 6.2 worked just fine, so I suppose it should be a problem in the code.

[JoeCFD]

@Ivelin put or zip your whole test code somewhere for other people to be able to access for testing.

[Ivelin]

@JoeCFD, I will, but I just think that I have found something !

This is my current code:

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    checkPermission();
    checkPermission1();

    QWidget widget;
    QPushButton btn;
    btn.setMinimumSize(QSize(200, 200));
    btn.setText("Take a picutre");

    QVBoxLayout layout;
    layout.addWidget(&btn);
    widget.setLayout(&layout);

    QCamera *camera = new QCamera;
    QMediaCaptureSession m_captureSession;
    QImageCapture *m_imageCapture;

    camera = new QCamera(QCameraDevice::FrontFace);
    m_captureSession.setCamera(camera);

    m_imageCapture = new QImageCapture;
    m_captureSession.setImageCapture(m_imageCapture);
    QObject::connect(camera, &QCamera::errorOccurred, [&camera]()
                     {
        if (camera->error() != QCamera::NoError)
            qDebug() << "ERROR: " << camera->errorString(); });

    QObject::connect(m_imageCapture, &QImageCapture::errorOccurred, [](int id, const QImageCapture::Error error, const QString &errorString)
                     { qDebug() << "ERROR: " << errorString; });

    camera->start();

    QObject::connect(&btn, &QPushButton::clicked, [m_imageCapture, camera]()
                     {
                         qDebug() << camera->isActive() << " " << m_imageCapture->isReadyForCapture();
                         int id = m_imageCapture->captureToFile("/storage/emulated/0/Download/f.jpeg"); });

    widget.show();
    return a.exec();
}

After having those QObject:connect for rrorOccured when clicking the button, so I can take a picture I get:

ERROR:  "Could not capture in stopped state"

Maybe this is a valid lead ?

Could someone take a look?