Notes of a Developer » Mac OS X

ANSI escape sequences for coloring

Vladimir Boychentsov — Thu, 02 Feb 2012 11:06:07 +0000

More about ANSI escape code

I modify my twitter script from previous post and now timeline looks like this:

My Modified Neon(author zb3k) Bowtie theme

Vladimir Boychentsov — Thu, 02 Feb 2012 09:04:47 +0000

If album does not has artwork:

Download theme

How to get twitter timeline in Command line (for GeekTool)

Vladimir Boychentsov — Tue, 31 Jan 2012 21:32:55 +0000

Install next gem yajl-ruby, twitter, htmlentities

1	sudo gem install yajl-ruby twitter htmlentities

create app on twitter developer portal and copy keys

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#!/usr/bin/ruby
# Copyright Vladimir Boychentsov, 2012
# site http://www.developers-life.com/
# Released under BSD

require 'rubygems'
require 'twitter'
require 'htmlentities'

Twitter.configure do |config|
config.consumer_key = "Consumer key"
config.consumer_secret = "Consumer secret"
config.oauth_token = "Access token"
config.oauth_token_secret = "Access token secret"
end

decoder = HTMLEntities.new

tweets = Twitter.home_timeline()
for tweet in tweets
printf "%s: %s",tweet.user.screen_name,decoder.decode(tweet.text) + "\n\n"
end

Or use this code for GeekTool like this

P.S.: in next post I will write about coloring text

NSTableView with custom header

Vladimir Boychentsov — Sun, 22 Jan 2012 12:04:16 +0000

Default header looks like this

First we want change height of header:

1 2	NSTableHeaderView *tableHeaderView = [[NSTableHeaderView alloc] initWithFrame:NSMakeRect(0, 0, 120, 60)]; [_tableView setHeaderView:tableHeaderView];

Next step we want change NSTableHeaderCell, can make category for this class or make subclass. So, I wrote subclass.

Empty category

Rewrite method for change style

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@implementation NSTableHeaderCell (VBNSTableHeaderCell)

- (void)drawWithFrame:(NSRect)cellFrame inView:(NSView *)controlView {

NSMutableParagraphStyle * aParagraphStyle = [[NSMutableParagraphStyle alloc] init];
[aParagraphStyle setLineBreakMode:NSLineBreakByWordWrapping];
[aParagraphStyle setAlignment:NSCenterTextAlignment];
NSMutableDictionary *attrs = [[NSMutableDictionary dictionaryWithDictionary:
[[self attributedStringValue]
attributesAtIndex:0
effectiveRange:NULL]]
mutableCopy];
[attrs setObject:aParagraphStyle forKey:NSParagraphStyleAttributeName];

NSGradient *grayGradient = [[NSGradient alloc] initWithColorsAndLocations: [NSColor colorWithDeviceWhite:0.95 alpha:1], 0.1,
[NSColor colorWithDeviceWhite:0.5 alpha:1], 0.9, nil];
[grayGradient drawInRect:cellFrame angle:90];

[[self stringValue] drawInRect:cellFrame withAttributes:attrs];
}
@end

AVPlayer – looping video without “hiccup”/delays

Vladimir Boychentsov — Sat, 17 Dec 2011 10:35:35 +0000

I tried create loop by AVQueuePlayer, this method has delays between end and start play.

for looping AVQueuePlayer i use this code:

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[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(playerItemDidReachEnd:)
name:AVPlayerItemDidPlayToEndTimeNotification
object:self.mPlayerItem];

[self player].actionAtItemEnd = AVPlayerActionAtItemEndNone;

and playerItemDidReachEnd

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- (void)playerItemDidReachEnd:(NSNotification *)notification
{
AVPlayerItem *p = [notification object];
[p seekToTime:kCMTimeZero];
}

Another solution without hiccups/delays based on AVMutableComposition!

Easily solution, I use one AVURLAsset for inserting to composition. No memory leaks and warnings, because used just one object.

Solution:

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- (AVAsset*) makeAssetComposition {

int numOfCopies = 25;

AVMutableComposition *composition = [[[AVMutableComposition alloc] init] autorelease];
AVURLAsset* sourceAsset = [AVURLAsset URLAssetWithURL:mURL options:nil];

// calculate time
CMTimeRange editRange = CMTimeRangeMake(CMTimeMake(0, 600), CMTimeMake(sourceAsset.duration.value, sourceAsset.duration.timescale));

NSError *editError;

// and add into your composition
BOOL result = [composition insertTimeRange:editRange ofAsset:sourceAsset atTime:composition.duration error:&editError];

if (result) {
for (int i = 0; i < numOfCopies; i++) {
[composition insertTimeRange:editRange ofAsset:sourceAsset atTime:composition.duration error:&editError];
}
}

return composition;
}

Play composition:

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AVAsset *composition = [self makeAssetComposition];

// create an AVPlayer with your composition
AVPlayer* mp = [AVPlayer playerWithPlayerItem:[AVPlayerItem playerItemWithAsset:composition]];

// Add the player to your UserInterface
// Create a PlayerLayer:
AVPlayerLayer *playerLayer = [AVPlayerLayer playerLayerWithPlayer:mp];

// integrate it to your view. Here you can customize your player (Fullscreen, or a small preview)
[[self window].layer insertSublayer:playerLayer atIndex:0];
playerLayer.frame = [self window].layer.bounds;
playerLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
//And finally play your video:

[mp play];

Any questions to comments please.

AudioSession AudioRouteChange

Vladimir Boychentsov — Sat, 17 Dec 2011 09:56:46 +0000

if you will use or used AVPlayer or you want just know about changes, you can check AudioRouteChange.

Simple solution:

Add framework AudioToolbox and add import to file

#import

Insert into init method or any other

1	AudioSessionAddPropertyListener (kAudioSessionProperty_AudioRouteChange, callbackHeadphone_func, self);

Listener callback

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void callbackHeadphone_func ( void *inClientData, AudioSessionPropertyID inID, UInt32 inDataSize, const void *inData ) {
if ( inID == kAudioSessionProperty_AudioRouteChange ) {
[mainViewController performSelector:@selector(isHeadsetPluggedIn)];
}
}

- (void) isHeadsetPluggedIn {

UInt32 routeSize = sizeof (CFStringRef); CFStringRef route;

AudioSessionGetProperty (kAudioSessionProperty_AudioRoute, &routeSize, &route);
/* Known values of route:
"Headset"
"Headphone"
"Speaker"
"SpeakerAndMicrophone"
"HeadphonesAndMicrophone"
"HeadsetInOut"
"ReceiverAndMicrophone"
"Lineout" */

NSString* routeStr = (NSString*)route;
DLog(@"%@",routeStr);
}

Sorting by block

Vladimir Boychentsov — Sat, 22 Oct 2011 19:17:30 +0000

Sorting by block

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NSArray *stringsArray = [NSArray arrayWithObjects:
@"string 1",
@"String 21",
@"string 12",
@"String 11",
@"String 02", nil];

static NSStringCompareOptions comparisonOptions = NSCaseInsensitiveSearch | NSNumericSearch |
NSWidthInsensitiveSearch | NSForcedOrderingSearch;
NSLocale *currentLocale = [NSLocale currentLocale];

NSComparator finderSortBlock = ^(id string1, id string2) {

NSRange string1Range = NSMakeRange(0, [string1 length]);
return [string1 compare:string2 options:comparisonOptions range:string1Range locale:currentLocale];
};

NSArray *finderSortArray = [stringsArray sortedArrayUsingComparator:finderSortBlock];
NSLog(@"finderSortArray: %@", finderSortArray);

Result:
/*
Output:
finderSortArray: (
“string 1″,
“String 02″,
“String 11″,
“string 12″,
“String 21″
)
*/

Getting Font Metrics

Vladimir Boychentsov — Sat, 22 Oct 2011 19:11:16 +0000

Doc about font metric

Getting Font Metrics

Get Geo tags from image

Vladimir Boychentsov — Wed, 17 Aug 2011 22:22:44 +0000

Little application for getting geo location from photo

Download Application

Administrator Privilege in Mac OS X app

Vladimir Boychentsov — Wed, 17 Aug 2011 20:17:49 +0000

If the Terminal command requires Administrator Privilege (aka sudo), use AuthorizationExecuteWithPrivileges instead. The following will create a file named “com.developers-life.test” is the root directory “/System/Library/Caches”.

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AuthorizationRef authorizationRef;
FILE *pipe = NULL;
OSStatus err = AuthorizationCreate(nil,
kAuthorizationEmptyEnvironment,
kAuthorizationFlagDefaults,
&authorizationRef);

char *command= "/usr/bin/touch";
char *args[] = {"/System/Library/Caches/com.developers-life.test", nil};

err = AuthorizationExecuteWithPrivileges(authorizationRef,
command,
kAuthorizationFlagDefaults,
args,
&pipe);