So, the problem is. How can I specify my Include path in XCode (gcc -I./mypath).

Tap on your project target, and click “Get Info“, tap on “Build” tab and search “Path” as showed in the figure above. Then click on the “Header Search Paths” options and add your favorite include paths for selected target.

Snow Leopard has introduced a new BSD-level infrastructure, with simple and efficient API to do this job. Here a little usage preview.

Block objects are a C-based language feature that you can use in your C, Objective-C, and C++ code. Blocks make it easy to define a self-contained unit of work. Blocks are something like Actions (delegate {}) in C#. Very useful to embed function in loops.

Blocks looks like a “private” function pointer, but you can access to the “parent” vars. (If you’re a Python coder, you’ve exactly the same thing).

/* Blocks in Python...
 * def main():
 *    a = 10
 *    def test(k):
 *        print a, k
 *    test(128)
 */
int main (int argc, const char *argv[]) {
  int a = 12;

  void (^test_block) (int) = ^(int k) {
    printf("A Block: PARENT(%d) ARG(%d)\n", a, k);
  };

  test_block(128);

  return 0;
}

The GCD queue API provides dispatch queues from which threads take tasks to be executed. Because the threads are managed by GCD, Mac OS X can optimize the number of threads based upon available memory, number of currently active CPU cores, and so on. This shifts a great deal of the burden of power and resource management to the operating system itself, freeing your application to focus on the actual work to be accomplished.

#include <dispatch/dispatch.h>
#include <stdlib.h>
#include <stdio.h>

#define ITEM_VMIN       (1)
#define ITEM_VMAX       (200)
#define NR_ITEMS        (100)

static void __fill_item (void *items, size_t n) {
  int *i_items = (int *)items;
  i_items[n] = (ITEM_VMIN + (int)(ITEM_VMAX * ((double)rand() / RAND_MAX)));
}

static void __work_on_item (void *items, size_t n) {
  int *i_items = (int *)items;
  i_items[n] *= 100;  /* Do some Computation on this Item */
}

int main (int argc, const char *argv[]) {
  dispatch_queue_t queue;
  int data[NR_ITEMS];

  /* Get Global Dispatch Queue */
  queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);

  /* Initialize data Elements, and run computation on each element */
  dispatch_apply_f(NR_ITEMS, queue, data, __fill_item);
  dispatch_apply_f(NR_ITEMS, queue, data, __work_on_item);

  /* Brief review of the items */
  dispatch_apply(NR_ITEMS, queue, ^(size_t n) {
    printf("Results: Item %lu = %d\n", n, data[n]);
  });

  return 0;
}

Ok, It’s one week later… but I’ve installed it just right now. Maybe tomorrow morning an usage example of Grand Central Dispatch.

The code below shows you how to record something. Then with the updateMeters() and peakPowerForChannel() you can extract the audio “noise”.

NSURL *url = [NSURL fileURLWithPath:@"/dev/null"];
NSDictionary *settings = [NSDictionary dictionaryWithObjectsAndKeys:
    [NSNumber numberWithFloat:44100.0], AVSampleRateKey,
    [NSNumber numberWithInt:kAudioFormatAppleLossless], AVFormatIDKey,
    [NSNumber numberWithInt:1], AVNumberOfChannelsKey,
    [NSNumber numberWithInt:AVAudioQualityLow], AVEncoderAudioQualityKey,
    nil];

NSError *error;
recorder = [[AVAudioRecorder alloc] initWithURL:url
            settings:settings error:&error];
if (recorder) {
    [recorder prepareToRecord];
    recorder.meteringEnabled = YES;
    [recorder record];
    ...
}

The SWF Video is available here Voice Mill Video.
The Source Code is available here Cocoa Voice Mill Source Code.

The source code is available here: Touch, Drag, Hit Source Code.

Note: This example doesn’t have anything related to the Qt 4.5 Cocoa Support.

Run the Qt4 Server, and the Cocoa Application (Remember to change the SERVER_HOST in AppController.m) and try to send some binary data. The Qt Server will receive this data it will resend you. Protocol is Very easy 1 byte of Data Type (Int8, Int16, ..) and Data. Remember that Intel arch is Little Endian.

Note: This is just a “Draft” a “non complete” example only to give the idea on how it works.

The Source Code is available here: Qt/Cocoa DataStream Source Code.

The Source Code is Available Here: iPhone Gravatar Example.

The Apple Worldwide Developers Conference (WWDC) takes place June 8-12, 2009 held at Moscone Center West in San Francisco. http://developer.apple.com/WWDC/.

Joel asked me to revise the Sidebar, allowing to add/remove and do other operation at any time.

I’ve rewritten all the code of the Sidebar, and I’ve added a couple of new features, like the default action handler and obviously the ability to add, remove items and badges at any time.

All the past features, like Drag & Drop are still present, but there’s something else to do to improve it. If You’ve suggestions, patches or something else post a comment or send me a mail!

The Source Code is Available Here: Cocoa Sidebar 2 Source Code.

Update 10 March 2008 – Source Updated with Fixes.

You can find the source code here: Drag & Drop Test Source Code.

The interesting part of this example is How to manage WebKit content, and how to add something dynamically.

I use webView:decidePolicyForNavigationAction:request:frame:decisionListener: of WebPolicyDelegate Protocol to handle my custom requests, in this way…

- (void)webView:(WebView *)sender
    decidePolicyForNavigationAction:(NSDictionary *)actionInformation
   request:(NSURLRequest *)request frame:(WebFrame *)frame
   decisionListener:(id)listener
{
    if ([[[request URL] path] isEqualToString:@"PATH to Handle"]) {
        [listener ignore];
        // Handle Request
    } else {
         [listener use];
    }
}

…Then with a little bit of JavaScript I’ll set my dynamic content loaded from Database or somewhere else.

NSArray *args = [NSArray arrayWithObjects:@"Item1Content",
                                  @"Hi, I'm Test 1 Content", nil];
[[webKit windowScriptObject] callWebScriptMethod:@"fillElement"
                               withArguments:args];

The fillElement method is a simple JS function like this document.getElementById(elem).innerHTML = data;

Here you can find the Source Code.

Cocoa Sidebar

You can find the example Source Code Here.

And below you can see hot to add folders, nodes and set badges.

- (void)populateOutlineContents:(id)inObject {
  NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

  [sidebar addRootFolder:@"1" name:@"DEVICES"];
  [sidebar addChild:@"1.1" name:@"Machintosh HD"
               icon:[NSImage imageNamed:NSImageNameComputer]
             action:@selector(buttonPres:) target:self];

  [sidebar addRootFolder:@"2" name:@"PLACES"];
  [sidebar addChild:@"2.1"
                url:NSHomeDirectory()
             action:@selector(buttonPres:) target:self];

  [sidebar addRootFolder:@"3" name:@"OTHER."];
  [sidebar addChild:@"3.1" name:@"Bonjour"
               icon:[NSImage imageNamed:NSImageNameBonjour]
             action:@selector(buttonPres:) target:self];
  [sidebar addChild:@"3.2" name:@"Users"
               icon:[NSImage imageNamed:NSImageNameUserGroup]
             action:@selector(buttonPres:) target:self];

  [sidebar clearSelection];

  // Add Badge to Node with Key
  [sidebar setBadge:@"2.1" count:5];
  [sidebar setBadge:@"3.2" count:7];

  [pool release];
}

- (void)buttonPres:(id)sender {
  NSLog(@"Button Press %@", [sender nodeTitle]);
}

Here you can find the Mac Example Source Code and the iPhone Example Source Code.

This is a simple usage example:

Sqlite *sqlite = [[Sqlite alloc] init];

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
                             NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *writableDBPath = [documentsDirectory
                        stringByAppendingPathComponent:@"SQLiteTest.db"];
if (![sqlite open:writableDBPath])
  return;

[sqlite executeNonQuery:@"CREATE TABLE test (key TEXT NOT NULL, value TEXT);"];
[sqlite executeNonQuery:@"DELETE FROM test;"];
[sqlite executeNonQuery:@"INSERT INTO test VALUES (?, ?);",
                        [Sqlite createUuid], @"PROVA"];
[sqlite executeNonQuery:@"INSERT INTO test VALUES (?, ?);",
                         [Sqlite createUuid], @"PROVA 2"];
[sqlite executeNonQuery:@"INSERT INTO test VALUES (?, ?);",
                         [Sqlite createUuid], @"PROVA 3"];

NSArray *results = [sqlite executeQuery:@"SELECT * FROM test;"];
for (NSDictionary *dictionary in results) {
  NSLog(@"Row");
  for (NSString *key in [dictionary keyEnumerator])
      NSLog(@" - %@ %@", key, [dictionary objectForKey:key]);
}

[results release];
[sqlite release];