Wow! Thanks a lot!!!
class CMRotationRate (Structure):
fields = [('x', c_double), ('y', c_double), ('z', c_double)]
and
gyro_data.rotationRate(argtypes=[], restype=CMRotationRate)
was exactly the answer I searched for.
It was my last open issue impementing an AHRS algorithm on Pythonista.

I would like to read the raw gyroscope data via objc_util. Generally it seems to work. The problem is that the return value is a Object-C structure resulting in a obc_util.__Structure class. The question is how I can the fetch the values of this structure. Appending a simple ".x" does not work.

Wow. It works. Thanks, Ole!

The coding changes are indicated by ">>> Bridge":

//
//  AppDelegate.m
//  Pythonista
//
//  Created by Ole Zorn on 1/19/15.
//
//

#import "AppDelegate.h"
#import "PythonistaAppViewController.h"
// >>> Bridge
#import "Python.h"
// <<< Bridge
PyMODINIT_FUNC init_sensor(void);

@implementation AppDelegate

- (void)applicationDidFinishLaunching:(UIApplication *)application



{   // >>> Bridge
    struct _inittab pyqt_inittab[] = { {"_sensor", init_sensor},{0,0}};
    PyImport_ExtendInittab( pyqt_inittab);
    // <<< Bridge
    NSFileManager *fm = [NSFileManager defaultManager];
	NSString *docPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject];

Thanks, for the reply, but it's still not working.

This my test coding of _sensor.m :

//
//  _sensor.m
//  PilotsApp
//
//
//

#import <Foundation/Foundation.h>
#import "Python.h"

PyObject* sensor_get(PyObject* self, PyObject* pArgs)
{
    NSString *stringValue = @"done";
    return PyUnicode_FromString([stringValue UTF8String]);
}

static PyMethodDef Methods[] = {
    {"get", sensor_get, METH_NOARGS, "get() -- Get the clipboard's text content as a string"},
    // [...]
    {NULL, NULL, 0, NULL} //sentinel
};

PyMODINIT_FUNC init_sensor()
{
     Py_InitModule("_sensor", Methods);
}

Then I implemented the file sensor.py :

from _sensor import *

And extacly this statement ends in "No module named _sensor"

Do I have to change any compiling or linking flags ?

Sorry for the naive question, but I :

• Included the “Python.h”- directory to the header include option
• Implemented such a coding like the clipboard example , called the module “_sensors”
  Compiling and linking was done without any errors.
  Then I added “import sensors” to my main.py file and got the error during runtime that the module is not defined.
  What is missing ?

For any suggestions grateful
Stefan

Yesterday I tried to access objc_util from a xcode ( import objc_util) . But this does not work.
Is it not possible ?

I would like to compile and run the template under Xcode 7.1 and iOS 9 but get such an error:

Undefined symbols for architecture arm64:
"_ffi_prep_closure_loc", referenced from:
__ctypes_alloc_callback in liblibpythonista.a(callbacks.o)
"_ffi_prep_cif", referenced from:
__ctypes_callproc in liblibpythonista.a(callproc.o)
__ctypes_alloc_callback in liblibpythonista.a(callbacks.o)
"_ffi_call", referenced from:
__ctypes_callproc in liblibpythonista.a(callproc.o)
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Are there any ideas, what will be wrong ?

THX, Stefan

I'm programming a prototyp for a flight navigational software and I would like to use Pythonista. Although you added functions for reading sensor data by introducing the motion module, this functions are not usable if the iphone is in a vertical position, which is the normal case. Hence it makes sense, just to provide the raw data of acceleration and gyroscope.

As an example of the accelerator:

- (void)startAccelerometer {

 if ([self.motionManager isAccelerometerAvailable] == YES) { 

 [self.motionManager startAccelerometerUpdatesToQueue:queue 

withHandler:^(CMAccelerometerData *accelerometerData, NSError 

*error) { 

 self.ac_x = accelerometerData.acceleration.x; 

 self.ac_y = accelerometerData.acceleration.y; 

 self.ac_z = accelerometerData.acceleration.z; 

 }]; 

 } 

}