Thread: Mac Developers -Help! Problem Building App in Xcode

Undefined symbols means that the linker cannot find that function/external variable when it links/binds the application together.

NSApplication is the main class that all application is built upon.

I got the same message when I "deployed" my application for a couple of Quicktime functions and that was because I didn't include the Quicktime.frameworks (that shouldn't be the case for you).

I haven't tried the applescript approach in Xcode but the error message should be the same whichever language you use.

Try to clean all targets before you build, maybe that can solve your problem.

Just a shot in the dark, but an undefined _NSApplicationMain may mean your missing the Cocoa/Cocoa.h imports.

Just to reiterate what Ph75 said, you might be missing frameworks. Make sure that Cocoa.framework and AppKit.framework are both in you Frameworks folder in xcode.

Also try deleting the build directory in the project dir. That basically forces a clean build and might solve the problem.

Possibly your main.m file could have been corrupted some how. It happened to me once, coming out of a tarball my main.m file contained half my project code :P.

If you still can't get this to work, try asking a question on the apple mailing lists. They are always very helpful.

If you really still can't get it to work, wrap it up in a tarball and post if somewhere so we can take a look at it :P

Wow! I appreciate the speedy replies. I've attached a screen capture of the Xcode window for a bit more info.

1. I tried "Clean all targets" but that didn't help.
2. I changed the build directory to a completely different location but no help.
3. I deleted the build directory before building but that didn't help.
4. According to Xcode, the Cocoa framework and Appkit framework are there and there's lots of headers.

[Edit:] One other potentially significant piece of information - I originally named this application "iView". I then decided to rename it "Harmony". I found a posting about how to change the app's name without having to reimport all the files into a new project. I changed the name of the app in the "Project --> Edit active target iView". I wonder if this didn't mess it up. You can see in the screenshot that the app generated is Harmony but the target is iView.

I have a feeling that my main.m got corrupted somehow. I'm not certain what it's supposed to look like, though.

If you wouldn't mind just taking a look at the screenshot and see if everything looks okay. If it does, I'll take this question to the Apple list serve. They've been mighty helpful with Applescript questions.

Well the main.m file looks correct for an apple script application, try adding this

Code:

#import <mach-o/dyld.h>
#import <Cocoa/Cocoa.h>   //add this line

I did that, but it didn't help, but I've fixed my immediate problem. I just created a new project, named it the right name and imported the files from the damaged project.

It built and worked, so I'm okay.

Thanks for the suggestions, Ben and Ph.

Yeah that was my next suggestion. You perhaps might want to send a bug report to apple about this. It never hurts to do so.