access to sensors on s60 with qt mobility

[Ghal_Maraz]

hi,

i got some experience with qt, but i am new to symbian programming.
i am writing a first small application so access some sensor. i started
with the QAmbientLightSensor. In the simulator everything runs fine,
but on the device (5800 XM) the light level is always undefined.

My Code:
Configuration in the .pro-file:

CONFIG += mobility
MOBILITY += sensors

Setup an check the sensor in the MainWindow-Constructor:

ambientLightSensor = new QAmbientLightSensor;
if (!ambientLightSensor->connectToBackend())
warning("Warning: Could not connect to backend.");
if (!ambientLightSensor->start())
warning("Warning: Could not start sensor.");
if (!ambientLightSensor->isActive())
warning("Warning: sensor is not active.");

Read in a private slot:

QAmbientLightReading::LightLevel lightLevel = ambientLightSensor->reading()->lightLevel();

I am using Qt 4.7.0, Qt Mobility 1.02 and the remote compiler.

Can anybody tell me what i am doing wrong? Are there missing configurations (perhaps target.capabilites)?

Best regards
ghal maraz

[ltomuta]

Can anybody tell me what i am doing wrong? Are there missing configurations (perhaps target.capabilites)?

ReadDeviceData is indeed a capability requirement so add it to your project.

[Ghal_Maraz]

Oh, sorry. I forgot to quote that. Because i dont know which capabilites
are for which access exactly i included all i could find:

symbian {
TARGET.CAPABILITY = Location \
NetworkServices \
LocalServices \
ReadUserData \
WriteUserData \
UserEnvironment \
ReadDeviceData \
WriteDeviceData
}

[Ghal_Maraz]

No ideas? Does the application needs to be Symbian-signed or something like that?
Does anybody now where i can get an example or demo project with the same issue
(reading the ambient light level)?

best regards

[Ghal_Maraz]

i hate if i am searching for errors and find an unresolved thread.
i finally found my error.

i replaced

QAmbientLightReading::LightLevel lightLevel = ambientLightSensor->reading()->lightLevel();

with

QAmbientLightReading *reading = ambientLightSensor->reading();
QAmbientLightReading::LightLevel lightLevel = reading->lightLevel();

and now it works.

best regards
ghal maraz