Resolved A command line app

man gdb

If you're familiar with scanf() and friends, you can use them. Or anything else in <stdio.h>. Or in any other C library.

You can tell Xcode to open the man page for any command, function, etc. Open man page is under Xcode's Help menu.

See the basic Xcode project mgmt docs.

In Xcode Application templates (Xcode 3.*),
choose the Command Line Tool template,
from the Type popup
choose Foundation.


Example of a simple command-line Foundation tool:

Code:

#import <Foundation/Foundation.h>

int main( int argc, const char * argv[] )
{
	NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

	NSString * cwd = nil;
	{
		char cbuf[ 2000 ];
		getcwd( cbuf, sizeof(cbuf) );
		cwd = [NSString stringWithUTF8String:cbuf];
	}

	NSLog( @"cwd: %@", cwd );

	NSLog( @"More stuff goes here." );

	[pool drain];
	return 0;
}

The C function getcwd() gets the working directory pathname in cbuf. The stringWithUTF8String: method converts it to an NSString. The returned NSString is NOT owned by the example code shown.

You will need to understand ownership if you use retain/release. You may find garbage collection worthwhile, as it can save some effort in managing ownership.
http://developer.apple.com/library/mac/#documentation/cocoa/Conceptual/MemoryMgmt/MemoryMgmt.html

You will also want to read the entire NSString class reference doc. Really. It has a lot of methods useful for converting to/from C strings.