Elton's Blog

bash < <(curl -s https://rvm.beginrescueend.com/install/rvm)

cd ~/
sudo vim .bash_profile
 
#在.bash_profile中加入
[[ -s "$HOME/.rvm/scripts/rvm" ]] && source "$HOME/.rvm/scripts/rvm"  # This loads RVM into a shell session.

$ rvm list known
# MRI Rubies
1.8.6[-p420]
1.8.6-head
1.8.7[-p352]
1.8.7-head
1.9.1-p378
1.9.1[-p431]
1.9.1-head
1.9.2-p180
1.9.2[-p290]
1.9.2-head
ruby-head
...

rvm install 1.9.2

$rvm use 1.9.2
Using /Users/elton/.rvm/gems/ruby-1.9.2-p290
$ruby -v
ruby 1.9.2p290 (2011-07-09 revision 32553) [x86_64-darwin11.1.0]

rvm --default use 1.9.2

gem install rails

// Disable the idle timer
[[UIApplication sharedApplication] setIdleTimerDisabled: YES];
 
// Or for those who prefer dot syntax:
[UIApplication sharedApplication].idleTimerDisabled = YES;

NSAutoreleaseFreedObjectCheckEnabled
NSZombieEnabled
NSDebugEnabled

- (NSString *)createUUID
{
  // Create universally unique identifier (object)
  CFUUIDRef uuidObject = CFUUIDCreate(kCFAllocatorDefault);
 
  // Get the string representation of CFUUID object.
  NSString *uuidStr = (NSString *)CFUUIDCreateString(kCFAllocatorDefault, uuidObject);
 
  // If needed, here is how to get a representation in bytes, returned as a structure
  // typedef struct {
  //   UInt8 byte0;
  //   UInt8 byte1;
  //   ...
  //   UInt8 byte15;
  // } CFUUIDBytes;
  CFUUIDBytes bytes = CFUUIDGetUUIDBytes(uuidObject);
 
  CFRelease(uuidObject);
 
  return uuidStr;
}

- (BOOL)application:(UIApplication *)application
didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    //--insert a delay of 5 seconds before the splash screen disappears--
    [NSThread sleepForTimeInterval:5.0];
    // Override point for customization after application launch.
    // Add the view controller’s view to the window and display.
    [window addSubview:viewController.view];
    [window makeKeyAndVisible];
    return YES;
}
 
这样splash页面就停留5秒后，消失了。

export GOROOT=$HOME/go
export GOARCH=amd64
export GOOS=darwin
export PATH=$PATH:$GOROOT/bin

source ~/.bash_profile

$ sudo easy_install mercurial

$ hg clone -r release https://go.googlecode.com/hg/ $GOROOT

$ cd $GOROOT/src
$ ./all.bash

--- cd ../test
N known bugs; 0 unexpected bugs

$ cat >hello.go <<EOF
package main
 
import "fmt"
 
func main() {
	fmt.Printf("hello, worldn")
}
EOF
 
$ 6g hello.go
$ 6l hello.6
$ ./6.out
hello, world
$

$ cd $GOROOT/src
$ hg pull
$ hg update release
$ ./all.bash

int main(int argc, char**argv) 
{
         NSLog(@"create an autorelasePooln");
         NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];   
 
         NSLog(@"create an instance of ClassA and autoreleasen");
         ClassA *obj1 = [[[ClassA alloc] init] autorelease];
         NSDate *now = [[NSDate alloc] init];
         NSTimer *timer = [[NSTimer alloc] initWithFireDate:now
                   interval:0.0
                   target:obj1
                   selector:@selector(createClassB)
                   userInfo:nil
                   repeats:NO];
         NSRunLoop *runLoop = [NSRunLoop currentRunLoop];
         [runLoop addTimer:timer forMode:NSDefaultRunLoopMode];
         [timer release];
         [now release];
         [runLoop run]; //在新loop中调用一函数，生成ClassB的autorelease实例
 
         NSLog(@"releasing autorelasePooln");
         [pool release];
         NSLog(@"autorelasePool is releasedn");
         return 0;
}

create an autorelasePool
create an instance of ClassA and autorelease
create an instance of ClassB and autorelease
ClassB destroyed
releasing autorelasePool
ClassA destroyed
autorelasePool is released

int main(int argc, char**argv) 
{
         NSLog(@"No autorelasePool createdn");
 
         NSLog(@"create an instance of ClassAn");
         ClassA *obj1 = [[ClassA alloc] init];
         NSDate *now = [[NSDate alloc] init];
         NSTimer *timer = [[NSTimer alloc] initWithFireDate:now
                   interval:0.0
                   target:obj1
                   selector:@selector(createClassB)
                   userInfo:nil
                   repeats:NO];
         NSRunLoop *runLoop = [NSRunLoop currentRunLoop];
         [runLoop addTimer:timer forMode:NSDefaultRunLoopMode];
         [timer release];
         [now release];
         [runLoop run]; //在新loop中调用一函数，生成ClassB的autorelease实例
         NSLog(@"Manually release the instance of ClassAn");
         [obj1 release];
 
         return 0;
}

No autorelasePool created
create an instance of ClassA
create an instance of ClassB and autorelease
ClassB destroyed
Manually release the instance of ClassA
ClassA destroyed

NSString *str1 = @”constant string”;

NSString *str2 = [NSString stringWithFormat:@”123”];

@interface ClassA : NSObject
{
         ClassB *objB;
}
 
-(ClassB *) getObjB;
-(void) setObjB:(ClassB *) value;
@end
 
@implementation ClassA
-(ClassB*) getObjB
{
         return objB;
}
 
-(void) setObjB:(ClassB*) value
{
         if (objB != value)
         {
                   [objB release];
                   objB = [value retain];
         }
}

-(void) dealloc
{
         [objB release];
         [super dealloc];
}

ClassA *obj1 = [[ClassA alloc] init];

ClassA *obj1 = [[[ClassA alloc] init] autorelease];

[obj1 release];
obj1 = nil;

ClassA *obj2 = obj1;
[obj2 retain];
//do something
[obj2 release];
obj2 = nil;

ClassA *Func1()
{
  ClassA *obj = [[[ClassA alloc]init]autorelease];
  return obj;
}

-(void) dealloc
{
         …
         [super dealloc];
}

ClassB *objB;

@property (retain) ClassB* objB;

@synthesize objB;

[objB release];

@interface ClassA : NSObject
{
         ClassB* objB;
}
 
@property (retain) ClassB* objB;
@end
 
@implementation ClassA
@synthesize objB;
-(void) dealloc
{
         [objB release];
         [super dealloc];
}
@end

void funcNoAutorelease()
{
         ClassB *objB1 = [[ClassB alloc]init];
         ClassA *objA = [[ClassA alloc]init];
         objA.objB = objB1;
         [objB1 release];
         [objA release];
}
 
void funcAutorelease()
{
         ClassB *objB1 = [[[ClassB alloc]init] autorelease];
         ClassA *objA = [[[ClassA alloc]init] autorelease];
         objA.objB = objB1;
}