Posts Tagged Software_Development

I told XCode to forget it, but it can’t

Another XCode bug brought to light thanks to the product “Little Snitch” (mentioned in my phone-home post),  I sometimes see a notice that XCode is trying to connect to the SSH port on an IP address I no longer use.   I can’t make it stop.   I just hope that whoever has the address now doesn’t track me down and send the Feds.  (That would be like worrying about a snowflake in a blizzard I’m sure.)

XCode was once setup to connect to my home IP address to get to the Subversion server I had there.  At a certain point I stopped using that server and started using repositories on my laptop because now I’m often unable to connect back to the house. (And because I wanted to shutoff the massive tower to lower my massive electric bill. )

I removed the IP address from my list of repositories under SCM Preferences, and the address is not listed under the SSH tab in that preference pane either.  A search of the XCode preference file turned up empty.  But somewhere that address is still remembered by XCode.

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XCode Crashes if it can’t phone-home

I’ve had trouble lately with XCode crashing immediately after an error trying to communicate with Apple’s servers.

I don’t know quite what’s happening, but i have Little Snitch installed on my Mac and I often work in Starbucks or bookstores where paid WiFi is available.   Somehow, being denied its chat with Apple makes XCode crash.

Little Snitch is a cool piece of software.  I bought it in one of those bundle deals from MacHeist or MacUpdate.  But its alert every time an unexpected communication attempt is made can be quite eye-opening.   However, I learned quickly to not deny XCode when it tries to talk to Apple.  The first time I did that, XCode crashed immediately and took my text changes with it.  (Not much work lost thankfully.)

I still make Little Snitch ask for permission for all XCode communications so I can see when they happen.  If I don’t press the “Allow” button before the attempt times out, XCode may or may not crash. I give permission as fast as possible so it won’t crash.

In the past few days though, XCode has still crashed, even with permission given in under 5 seconds.  I’ve begun to wonder if it might be a problem with router used by stores to get logins before allowing traffic out to the internet.  If XCode is denied at that point, will it still crash?  I don’t know yet.   But since such WiFi spots allow the computer to connect, it may look like you are on the internet when you aren’t.  Communications will fail.

Thankfully, it doesn’t try very frequently.  If it did,  it would be too frustrating to deal with all the crashes.  I also note that the XCode Console output shows a crash report submitted to Apple,  so I assume they don’t need another bug report on it.

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Helping XCode find its files

I started moving files around in my project folder recently.   I wanted to re-organize code and non-code files into different folders.

Once the files had been moved and the project re-opened, there are many source files displayed in red, meaning XCode does not know where they are.

To help XCode find missing files, try this:  select the red file,  perform “Get Info”, select the “General” tab and click the “Choose…” button.   You can then find and pick the file.  You can even change the file if you like.

Warning:  when you are doing this with a missing file, it is possible to substitute a folder for the file.   If you manage to do this, you won’t be able to just re-choose the file.   You’ll have to delete the folder and re-add the file.

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default.png won’t display

Funny one today:  my default.png file would not display.  My application launched with a black screen zooming out instead.  A quick look at another app that did work properly showed the only difference: the “D” was capitolized.  A quick check and sure enough, it worked if the D was upper-case.

That was a surprise to me, being so used to the case-insensitive file system on the Mac for so long.

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Executing Terminal Commands Inside Xcode

A long time ago,  I remember using Apple’s MPW environment to create software for the Mac.   This environment was a lot like using terminals had been on the Unix machines back in college. This had its plusses and minuses but it was strange in one fashion:  I could execute command-line scripts inside the text editor.  This ability has returned in Xcode.  (Well, I just noticed it recently due to a lucky accident. It may have been there all along.)

The default setup for Xcode uses Control-R (and variations with Option or Shift keys) to execute the currently selected text as a bash terminal command. If no text is selected, the entire line containing the insertion point is used. You can change which key does this in Xcode’s “Key Bindings” preference panel under the “Text Key Bindings” tab.  (Note that the variations are listed in the bindings panel mentioned.)

This can have many small, cool uses.   Here are a few off the top of my head:
this will give you a timestamp like this one: “Fri Jul 17 14:04:02 EDT 2009”
“ls” will list directories of files directly into your text file – this can be useful if you are looking to put a file name into a file open command or  something

If you have a useful command-line tool whose output would be useful in an Xcode text file, this will work for you.

What you can’t do is run programs that don’t stop or require further input, like TOP or SSH.  For those, you’ll still need to use the terminal program supplied with your computer.   If you do try this,  you will cause problems for Xcode that will probably lead to it locking up or crashing.

I tried this with “top” and Xcode started having difficulty editing the file any further.  Other things seemed to work, but it eventually crashed.  As I figured out later, a “top” process had started.  The second time, I found it in the process list and used “kill” on  it from the real terminal.  The moment I killed it, the Xcode window filled with a ton of output generated by TOP.

In another case, I tried to use the SQLite3 tool, but it just quit with this error: “Incomplete SQL”.  So interactive tools don’t work for this.

Of course, its easy to capture the output of command-line tools for text files in different ways, so this is cool, but not really earth-shaking.  It can make some work much quicker and easier.   Enjoy.

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iPhone Developer Bits 4

Changed your bundle identifier and now XCode won’t load the result app onto the iPhone or iPod Touch device?

– Try deleting the old version of the application from the device before loading/running the new one.

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iPhone Developer Bits 3

error “syntax error before ‘AT_NAME’ token”

This one frustrated me for longer than I care to think about. (It wasn’t really all that long, but my pride was hurt that I didn’t figure it out much more quickly.)  It appeared to be something wrong in the generated token stream but the messages gave no real clue as to why this was happening.  My first thought was that I had accidentally edited an SDK file.

However, when my own thinking doesn’t turn up the answer in an effective amount of time, I find it pays to Google for it. My usual practice is to duplicate the error text as exactly as possilbe so that I can find posts about the same problem.  (Start with the very specific and become more general if the answer doesn’t present itself.)

It turned out to be that I had gotten some extra text after the “@end” directive in a .h file

Special thanks to John Muchow for his post on which quickly lead me to the correct answer.  No doubt you saved me time and hair-pulling.

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iPhone Developer Bits 2

Are you getting kAMDApplicationVerificationFailedError when you try to run your app on a device?
– Check the status of your provisioning profile’s certificate in the Keychain Utility.  It may be expired.  If so, go to the program portal and create a new one.

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