MacResearch

Hi Mark,

Thanks for the suggestion. Code reuse is certainly an important topic.

Many people share small amounts of code these days simply as source files, and I actually find this the easiest way to incorporate third-party components. But if there are many source files, it may be worth building a framework. A framework is nothing more than a special target in Xcode.

In terms of designing frameworks, the main thing is to make as few assumptions as possible. Your code needs to work in a variety of settings, and with a variety of different classes. You need loose coupling, and you need to make sure there are 'hooks' in your code so that others can customize functionality. These hooks can include:

1. Methods that can be overridden in subclasses.
2. Notifications
3. Delegate methods

Writing a framework is generally more difficult that hacking together a piece of code that just needs to work well in one application. I think people sometimes underestimate how difficult it can be. For example, everyone seems to think Apple should have released an API for the iPhone by now, but to design that API to be flexible is not an easy task. Once you decide upon something in an API/framework, you can't go back easily in future. You have to make sure you cover as many bases as possible.

I'll think about how I could broaden this comment into an article in the series. Thanks for the feedback.

Drew
---------------------------
Drew McCormack
http://www.maccoremac.com
http://www.macanics.net
http://www.macresearch.org

Hi Ken,
These apps will be running the external executable (command) as a subprocess. To do this, you can use the NSTask class.
I will try to write about this in a future tutorial, because it's something that is useful in scientific apps.
Drew
---------------------------
Drew McCormack
http://www.maccoremac.com
http://www.macanics.net
http://www.macresearch.org

There is some documentation on combining Objective-C and C++ from Apple here.

Here is some sample code I was experimenting with that combines C++ and ObjC(it is not very clean, I will put up a cleaner version later). The code itself requires IT++, but it does show mixing C++ and ObjC.

Implementation file (.mm) here
Header file (.h) here

Regards,

Chinmoy

David,

for launching a web page in your default browser, you could implemente the following code

NSURL *url = [NSURL URLWithString:urlString];
[[NSWorkspace sharedWorkspace] openURL:url];

if you want to open the link within your app, just create a webview kit. and use the following code

[webView setMainFrameURL:urlString];

for a PDF, I guess it will be similar to 'NSWorkspace' or if you want to embed it i your app, I would check pdfkit.

for the image question, sometime ago I read a blog where the author created an app similiar to the one you mention. just google it. if I remember correctly, he(she) uses NSBundle.

regards

there are some fantastic tutorials on here, it would be fantastic if you were able to do a tutorial on implementing an NSOutlineView and the pros and cons of using an NSTreeController.

Keep up the good work! this is an amazing learning resource!

Thanks Drew for this tutorials, I haven't read all off them yet but I think they are really useful!, (Also I didn't realize that you where the author of that book!)

I'been studying in Japan for 8 years now. I am a master engineering student and can write native level Japanese, so I thought I could translate this tutorials... I think this will be a big contribution!.
If I submit (Submit Story>Tutorials) them will they be available to everyone? or do I have to contact someone from Macresearch.org before?

Thanks again

Ignacio Enriquez.
Keio University - Japan

hi,

you rock man! I've been looking for this information for some time but its no where..at last I found this awesome blog.:)

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The tutorials are great, especially for newbies in the field. I have less than 2 years experience and am currently working on some apps designed to work from online storage servers.

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The Cocoa for scientists has been found to be very useful. The tutorials given are extremely helpful to the beginners. Some of the tutorials are Classy Cocoa, Into Xcode, Living Objects, Good References, into a bind, Observe and learn and etc. Nowadays the open source has created a sort of revolution. Everybody is ready to share their piece of code with others. That helps a lot of people. It is useful in making a framework. It is quite a difficult job. Sam|www.thecallcentergroupa-z.com