Today i had another  weird moment with xCode/iPhone Simulator.

I had couple of projects open for a while and switched to one of those and wanted to test on the Simulator,
but xcode was reporting

Error launching simulated application: SpringBoard failed to launch application with error: 7

The Console log was showing like:

Xcode[27865] Error launching simulated application: Error Domain=DTiPhoneSimulatorErrorDomain Code=1 UserInfo=0x3fc3d80 "SpringBoard failed to launch application with error: 7"

When i switched the Active configuration to release, it was launching the app in simulator as usual. But Debug configuration seemed to have some issue. For next 10 minutes or so i was comparing the differences in Build settings/Target settings etc, nothing seems to be the problem.

Looking more attentively at Console logs shown the following lines were repeating everytime xcode fails to launch..

6/30/09 10:47:41 AM com.apple.launchd[55426] (com.apple.iPhoneSimulator:com.apple.installd[27624]) Exited: Terminated

6/30/09 10:47:41 AM com.apple.launchd[55426] (com.apple.iPhoneSimulator:com.apple.dataaccess.dataaccessd) Unknown key for integer: JetsamPriority

6/30/09 10:47:41 AM com.apple.launchd[55426] (com.apple.iPhoneSimulator:com.apple.apsd) Path monitoring failed on "/var/mobile/Library/Preferences": No such file or directory

When i googled, found there are quite close but the same trouble has been faced by many fellow xcoders.

Multiple Targets in Xcode: "Failed to launch simulated application: unknown error
iPhone: Failed to launch simulated application: unknown error
XCode error: failed to launch simulated application

and finally

iPhone Simulator: SpringBoard failed to launch application with error no 7

What worked for me finally:

Reset Content and Settings didnt work either but Quitting the simulator and re-launching did it.

I almost felt abused as i expected a complex solution to fix

anyway, back to happy xCoding!!

Sure, first time when i learnt about frameworks,  i was really excited!  What interested me most was, a framework can be marked as “Weak” so that applications can still work using new features in new framework and when using old version of the framework,can ignore some functionality. But as much as i was excited, i didn’t know how to mark a framework as “Weak”.

for instance, I was trying to support Compose Mail from within my application and while going through instructions below:

3. Make MessageUI a weak framework (set its role to Weak)
An application will fail to launch or proceed if it attempts to load a
framework on devices where this framework is absent.
With weak linking, an application does not fail, but proceeds when a symbol or
framework is not present at runtime. All weak-linked symbols are set to NULL on
devices without them.

To designate MessageUI as weak-linked, select the target's Link Binary With
Libraries build phase, then change MessageUI's role from Required to Weak in the
detail view.

Sounds simple, but for some reason i couldn’t figure out immediately how to do that. Maybe its common knowledge?

But for those who dont know this, here’s a tip to get this done:

To add new framework:

1. select the Target and select the application name and pull down (either -> arrow or click on that arrow symbol)
2. select Link Binary With Libraries
3. Right click and select Add
4. Choose Existing frameworks
   • 
5. Then click on the + in the next screen
   • 
6. Depends on your target SDK, you will get the option to choose the additional frameworks. For 3.0 it looks like below
   • 
7. After adding the framework, you can select the “Type” on the right and change to “Weak”
   • 

Then Build as usual.

Important to note:

Check for the existence of APIs before calling them

and

 Provide a workaround for non-existent APIs

This is the outcome of my random search on erlang before i am getting into it.

Hope i get some time to explore each of this in some details.

• The ERLANG community

The place for erlang!

• Brief intro by ERicsson

Ericsson homepage for erlang

• OPEN SOURCE ERLANG

Open-source Erlang is being released to help encourage the spread of Erlang outside Ericsson

• Language Introduction by Its inventor

One of the best presentations i’ve seen. I wonder how many programming language inventor would give an introduction about hardware scene before going in detail about the language. But it makes so much sense for erlang.

• Whats all the fuss about Erlang?

Teaser introduction

• Concurrency oriented Programming

Another presentation by the inventor.

• ERLang tutorials for web applications

Good collection of tutorials organized nicely

• EPOWIKI

Short wiki with interesting links

• ejabbered

ejabberd is a Jabber/XMPP instant messaging server written in Erlang/OTP.

• RABbitMQ

RabbitMQ is a complete and highly reliable Enterprise Messaging system

• Yet another WEB Server

Yaws is a HTTP high perfomance 1.1 webserver particularly well suited for dynamic-content webapplications

• erlang twist on Web frameworks

ErlyWeb is a component-oriented web development framework written in Erlang and designed to work with Yaws

• nitrogen – web framework for erlang

Nitrogen brings cutting-edge web development to Erlang

• erlang http toolkit

MochiWeb is an Erlang library for building lightweight HTTP servers

• erlang XCODE PLUGIN

Let your xcode help you on erlang development. Yet to try this.

• Why erlang – Ted Patrik

Will add more as i bump into..

All of a sudden the Organizer stated that my development device “could not support development”.

Restarting XCode couple of times didnt help!

Worked workaround: Reset the device and also restart xcode to be on safe side and everything would be back to normal!

Apparently this seems to me a bug in xcode with some corrupted data in device maybe.

When you choose XCode to generate the skeleton code, it places the header with your name and company name. Apparently there is no visible settings within xcode to set company name. Here’s one way to fix that.

1. Open Terminal
2. type

defaults write com.apple.xcode PBXCustomTemplateMacroDefinitions '{ ORGANIZATIONNAME = "My Great Company Name"; }'

Thats it!!