Tag Archives: coding

Fighting Qt Creator develpoing for SailfishOS

Prologue

For some days, I fight quite an epic battle with Qt Creator. A battle, I am losing right now. I recently started developing a SailfishOS app though. A spare time project which actually drives me mad. To be fair, one should say SailfishOS is quite at an early stage compared to other platforms. However, the SDK, the tool chain, including Qt Creator, VirtualBox integration, build and deploy process already work as a charm. It works out of the box. Even for someone like me, pampered by Visual Studio, Eclipse and corresponding platforms existing for a decade and more.

There are some shortcomings in documentation, though. As a developer myself, I know how hard it is to get some good documentation in place. Therefore, kudos for everything available already. Although, I spend 95% percent in digging the darkest places of the internet to find some information. I have to move out of my comfort zone, which is good. I learn a lot by digging around, which is even better. However, I do not get my project out of the starting blocks, which is bad.

Teh Facts

Following the tutorials available, I tried to create a SailfishOS dialog with two text fields as below.

import QtQuick 2.0
import Sailfish.Silica 1.0

Dialog {
    id: addDeviceDialog
    property string deviceName
    property string deviceIdentifier 

    anchors.fill: parent

    DialogHeader {
        title: qsTr("Add a Device")
    }

    TextField {
        id: deviceNameField
        placeholderText: qsTr("Device Name")
    }

    TextField {
        id: deviceIdentifierField
        placeholderText: qsTr("Device ID")
    }

    onDone: {
        if (result == DialogResult.Accepted) {
            deviceName = deviceNameField.text
            deviceIdentifier = deviceIdentifierField.text
        }
    }
}

Qt Creator, however, responds with

Could not resolve the prototype ‘TextBaseItem’ of ‘TextBase’. (M301)

I encounter this issue wit both, TextField and TextArea.

M301

I can remove this issue by adding

import QtQuick.Controls 1.0

But then Qt Creator responds with

Qml module not found

Modules seem to be installed and paths are set. I probably miss something over here or I do deal with the IDE in a terrible wrong way.

QtQuick.Controls 1.0I will dig further and contact the SailfishOS mailing list, looking forward to get some help there to update this article soon.

[Update, 13.07.2014]

There was an almost instant reply on my request on the mailing list, though. You can completely ignore this issue. Gt Creator will build and deploy without any issues. In my very case, I had an additional issue, where I forgot to set the width property of the text field. Once I did this, I was able to see the text field on my deployed app.

SOAP with Python

To evaluate a SOAP service, I decided to increase my Python skills by one by consuming the SOAP service with Python. SOAP Web Services from Dive Into Python seemed a quite good starting point with detailed instructions for setting up your Python environment to do so.

After starting to work thought this article how to install the required SOAP libraries, I realized quickly links are broken and various information became obsolete.  Therefore, I decided to summarize the amendments to set up SOAP libraries for Python, in this article focusing on how to set up PyXML, fpconst and SOAPpy.

Prerequisites
Before starting lets be sure Python is installed. You might check with

where python

to determine which python will be accessed via the PATH variable.In my case it is a Python 2.7 running on Windows 8.0.

Python 2.7 on Windows 8.0PyXML
PyXML can’t be accessed via http://pyxml.sourceforge.net/. Instead you have to access the site via http://pyxml.sourceforge.net/topics/ directly. Unfortunately, you might realize that the latest supported version from there is Python 2.4. You will find a Windows Installer for PyXML 0.8.4 for Python 2.7 at the OddThinking blog instead.

Run through the installer, just make sure, you pick the right Python installation during the process.

PyXML Installation DialogVerifying the installation is quite simple using the Python console, though.

>>> import xml
>>> xml.__version__
'0.8.4'
>>

fpconst
Instead of picking up the fpconst package from Unversity of Washington’s broken link,  you’ll meanwhile find fpconst 0.7.2 within the Python Package Index. Download and extract the archive to any temporary folder. Change folders to the extracted one and run

python setup.py install

from the console.

fpconst Package installationAgain very the installed package with

>>> import fpconst
>>> fpconst.__version__
'0.7.2'
>>>

SOAPpy
SOAPpy is probably the package causing the most headache. I first picked SOAPpy 0.12.0_rc1 from the download section at  http://pywebsvcs.sourceforge.net/. It caused more or less trouble, trying to install the package. In addition, SOAPpy was announced to be merged into the ZSI (Zolera SOAP Infrastructure) web service toolkit. If you are going to try ZSI anyway, download and installation are similar to the example above using

python setup.py install

Even the latest version of ZSI installs fine with Python 2.7.

Anyway, when sticking with SOAPpy, you might want to get the latest version (0.12.5) from the Python Package Index. Extracting the archive and following the steps above will result in an import error, though.

Traceback (most recent call last):
  File "setup.py", line 7, in <module>
    from setuptools import setup, find_packages
ImportError: No module named setuptools

To solve this, navigate to the setuptoools 0.9.8 in the Python Package Index, and download ez_setup.py to your local machine. Run the script with

python ez_setup.py

which will compile quite a bunch of stuff on your local machine. Follow the instructions, and add the C:\Python27\Scripts to your PATH variable.

Once installation is complete, you will find an easy_install.exe program in your Python Scripts subdirectory. For simple invocation and best results, add this directory to your PATH environment variable, if it is not already present.

Head back to the download folder of SOAPpy 0.12.5 and run once again

python setup.py. install

which should finally end up in something similar to

...

Installed c:\python27\lib\site-packages\docutils-0.11-py2.7.egg
Searching for fpconst==0.7.2
Best match: fpconst 0.7.2
Adding fpconst 0.7.2 to easy-install.pth file

Using c:\python27\lib\site-packages
Finished processing dependencies for SOAPpy==0.12.5

For the very last time, verify the installation by

>>> import SOAPpy
>>> SOAPpy.__version__
'0.12.5'
>>>

By now, you should be ready to use all three packages with your Python 2.7 installation.