#Pyqt4 open file dia for mac os x
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My test application, which I call Orbital Liftr, is a simple utility that I made for batch uploading graphics to Ars Technica's content management system. I do most of my actual development in Linux, but you can do it pretty comfortably on any of the platforms. For Windows, I'm running XP in VirtualBox.

#Pyqt4 open file dia pro

My computing environment is a quad core Mac Pro configured to dual-boot OS X and openSUSE 11.1.

#Pyqt4 open file dia for mac os x

The initial setup process for Mac OS X will require a lot of very heavy compilation, so you are going to be in for a world of pain and a very long wait if you try to do this on a Mac mini.

#Pyqt4 open file dia windows

The easiest way to accomplish this is to use a Mac and either triple-boot or virtualize Windows and Linux. Now that I have unlocked the toolkit's dark mysteries, I can show you the hidden secrets that will allow you to achieve mastery of the alchemical art of cross-platform PyQt application deployment.ДЇirst, you'll need access to each platform for which you want to build redistributable packages. I declared victory last week after spending several hours battling with MacPorts and distutils. The downside, however, is that packaging PyQt applications so that they can be deployed to users on Windows and Mac OS X is an immensely frustrating and arcane process. Qt applications that are written in C++ are easy to compile and deploy across all three platforms, but what if you don't like C++? I prefer Python, a dynamic programming language with a richly expressive syntax and exceptionally powerful support for introspection.ДЇortunately, there are cross-platform Python bindings for Qt. It provides native-looking widgets and tight integration with the underlying platform on Windows, Linux, and Mac OS X.

#Pyqt4 open file dia full

(Don't do this in real life, okay? This form is a usability and cultural-sensitivity disaster, and would be almost insultingly dumb to show in public.) We'll supply a Qt button that fills out the full name entry, shows the submit button, and prints the full name to the console.The open source Qt development toolkit is a popular choice for cross-platform development. There is a submit button, but it is hidden. There will be a full name entry that is disabled the user cannot edit it. It will show a form that allows the user to enter a first and last name. Now, let's throw caution to the wind and look at a simple example. Example of Evaluating JavaScript in a QWebView Be careful, validate user input, and block anything that looks too clever. It would be far too simple, for example, to allow the execution of arbitrary JavaScript by naГЇvely building a string and sending it to evaluateJavaScript. (It is at this point that we collectively grieve over JavaScript's ill-thought-out types.)ДЄn important caution about evaluateJavaScript: it has all the security implications of JavaScript's built-in eval, and should be used with the discretion that is so seldom displayed by front-end JavaScript coders.

I see no better option for functions, but null is especially confusing the only way to detect a null value from evaluateJavaScript is to do the comparison val = null on the JavaScript side before you return it to Python.

#Pyqt4 open file dia code

Note especially the behavior regarding null and functions, as both can cause code that looks right to behave wrong.

undefined becomes None, sensibly enough.

Objects are returned as Python dictionaries unless they are functions or arrays functions are returned as useless empty dictionaries, and arrays become Python lists.

Because JavaScript lacks separate integer and floating-point datatypes, numbers are consistently converted to Python floats.

It appears that strings and booleans just plain work, and numbers, objects, undefined, and null work with caveats: In fact, that information doesn't appear to be available on the web at all, so I did some testing. What values can be returned? The PySide documentation for QWebFrame, like that for PyQt and Qt itself, is not clear on that point.

That method accepts a string of JavaScript, evaluates it in the context of the QWebView's content, and returns its value. Presenting a user with web-style content is useful in itself, but that content can be made interactive with JavaScript, which can be initiated from Python code.ДЄ QWebView contains a QWebFrame object, which is useful to us right now for its evaluateJavaScript method.