Most existing examples on how to do external calls contain a lot of English explanation which can distract people, like myself, who learn by example. This is intended to be a compilable, terse example of how to call in and out of C/C++.

This is a C example: <eiffel> class APPLICATION

create make

feature -- Initialization

make is -- Run application. do

A common question asked about Eiffel, especially those coming from Java or C# backgrounds is, where's my try...catch...finally block?

Integrating Eiffel in to a COM environment is remarkably easy as the tools that handle the majority of the heavy lifting related to COM development already exist. Programming dynamically with COM is very different than programming statically with Eiffel so I've included common pitfall concept translations for these instances.

This page provides a step-by-step guide, showing you how to use db4o databases within Eiffel for .NET applications.

Step 1: Download Db4o Assembly

The result

First let's see the results of images in different quality levels. The highest quality is 100, the lowest quality is 0.

Original image:

Quality 100 image: (Maybe because the image is too big, 2.6mb, we can't upload it now. Sorry.)

Quality 75 image:

Having looked at code for interfacing Eiffel to C and creating callbacks from C to Eiffel, I frequently found that things were not done properly, resulting in potential memory corruption or crashes.

How do I set the size of an EV_PIXMAP?

Using a C/C++ external in an Eiffel system is pretty easy. Simply do a C/C++ inline and provide the arguments to the C/C++ externals.

When transforming the same system into a multithreaded application one has to pay attention to something else: C/C++ externals that may take a long time to execute.

Using blocking qualifier

This is a short tutorial for building web applications with Goanna

It covers the following topics

• Installing all the software you need
• Getting to know Goanna
• A short description on how to develop a web application with Goanna

How it all works

Goanna offers many different services and layers of abstraction.

Intro

We all know about generics as a wonderful help to implement container data structures like lists, sets, bags etc. Much later than Eiffel, object-oriented programming languages like Java and C# have understood that generic parameters are a powerful extension to the type system and remove the need for many casts. So, what else can we do with generics beyond containers?

Since some time Eiffel supports a serialization method completely written in Eiffel. It directly supports serialization to a file or to memory. This example shows how to use this to serialize an arbitrary object structure to a string.

People who are used to other programming languages usually use some kind of rand, rnd or similar function to generate random numbers. This article shows how you can do it in Eiffel.

Generating a random number