Facing new challenges everyday

I have been working hard trying to fix a bug with timeout engine of a symbian app used to handle socket timeout, sometimes the application crashes when the first timeout happens and others after several timeouts.

We had used large TBuf descriptors in many places of application, I changed to RBuf, no success.

I hope find the main reason of this bug soon and get more expertise with Symbian application development and debug.

The majority of applications requires a user interface to allow user interaction with application functionalities, this third part of our article will talk about the user interface files that are xml files used to define the contents of Qtopia graphical elements like dialog boxes and windows.

In the example below we are defining a QWidget called HelloWorldBase, this widget is the main window of helloworld application, it contains a QLineEdit (input box), a QLabel and a QPushButton each of then can be declared in xml using the <widget> tag where the class attribute indicate the widget type and name attribute holds the object instance name. Each widget may have default values for its properties, you can define the widget properties using <property> tag, a property requires a name that must be supplied on name attribute of this tag.
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In my previous article we had a short introduction to Qtopia development, I also showed how to use the example project that comes with SDK to start a new one.

This article will talk a little about one of the most important files of any Qtopia project the applicationname.pro file, this file contains very important configuration parameters for every Qtopia application, please open your preferred text editor and put the code below (look the comments):
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Few people has been asking about how digitally sign xml document in Delphi, after googling a while I found the component below:

http://www.clevercomponents.com/articles/article022/soapsecurity.asp

If you are a brazilian developer looking for resources for eNF’s (notas fiscais eletrônicas) you can find some answers in the urls below:

http://nf-eletronica.com/blog/faq/faqad

http://www.w3.org/TR/2000/CR-xmldsig-core-20001031/

Today I’m working with four mobile platforms:

At work:

• Symbian

At home:

• J2ME
• Qtopia
• Windows Mobile

After some years without touch in Visual Studio .NET and a little far away from Windows Mobile development, I’m finally back, now working on a small project for use in restaurants using a wi-fi connection.

I’ll post some of my challenges in this project when possible.