I want to write a file on my iPhone app. My file is in my project\'s folder, but when I try to reach it :
NSString *myFile = [[NSBundle mainBundle] pathForResour
As already said you can't write to the main bundle on an actual device.
To your other question:
When you run your app in the simulator xcode will copy your project to a folder in your library directory .. in your case to:
/Users/Damian/Library/Application Support/iPhone Simulator/5.1/Applications/
Every app you run in your simulator has a folder there. Apps are not run in the folders where you actually edit your code.