Latest comments for language 'Objective-C' on doukaku.org

匿名's comment on ファイル更新の監視

116行目のscheduledTimerWithTimeInterval:target:selector:userInfo:repeats: のメソッドでcurrentRunLoopに登録されますので、 122行目の addTimer:...はいらないんじゃないかなぁ。

tilde's comment on 自分自身のファイル名を知る方法

自分自身のファイル名を知る方法 (Nested Flatten)

開発環境： Mac OS X 10.5.2, Xcode 3.1 (Beta)

#import <Foundation/Foundation.h>

int main (int argc, const char * argv[]) {
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
    
    NSLog( [[[NSBundle mainBundle] executablePath] lastPathComponent] );
    
    [pool drain];
    return 0;
}

[ Objective-C ] [ download code ] ]

tilde's comment on 固定長データ

固定長データ (Nested Flatten)

開発環境： Mac OS X 10.5.2 Xcode 3.1 (Beta)

#import <Foundation/Foundation.h>

#define FilePath @"fixedlengthdata.txt"
const unsigned int RecordSize = 12 + 12 + 1 + 3 + 4 + 2 + 31 * 1502;
const unsigned int RecordCount = 500;

int main (int argc, const char * argv[]) {
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
    
    NSData* data = [NSData dataWithContentsOfMappedFile:FilePath];
    if ( data ) {
        NSMutableArray* array = [NSMutableArray array];
        for ( int i = 0; i < RecordCount; i++ )
            [array addObject:[data subdataWithRange:NSMakeRange( i * RecordSize, RecordSize )]];
    }
    
    [pool drain];
    return 0;
}

[ Objective-C ] [ download code ] ]

Psychs's comment on アルファベットの繰り上がり

アルファベットの繰り上がり (Nested Flatten)

#import <Foundation/Foundation.h>

NSString* toCol(int n)
{
  NSMutableString* s = [NSMutableString stringWithFormat:@"%C", 'A' + n%26];
  n /= 26;
  while (n > 0) {
    if (n <= 26) {
      [s insertString:[NSString stringWithFormat:@"%C", 'A' + n-1] atIndex:0];
      break;
    }
    n -= 1;
    [s insertString:[NSString stringWithFormat:@"%C", 'A' + n%26] atIndex:0];
    n /= 26;
  }
  return s;
}

int main()
{
  NSAutoreleasePool *pool = [NSAutoreleasePool new];
  int i;
  for (i=0; i<100; i++) {
    NSLog(@"%3d: %@", i+1, toCol(i));
  }
  [pool release];
  return 0;
}

[ Objective-C ] [ download code ] ]

Psychs's comment on Hello, world!その２

Hello, world!その２ (Nested Flatten)

main()
{
  puts("Hel\154o w\154r\154d!");
}

[ Objective-C ] [ download code ] ]

faultier's comment on 実行時間の測定

実行時間の測定 (Nested Flatten)

任意のオブジェクトに任意のメッセージを送ってその実行時間を測定するようにしてみました。
実行結果はこんな感じ。

$ ./profile
2007-11-16 02:11:49.268 profile[3982:10b] start profiling [TestClass func:]
2007-11-16 02:11:49.274 profile[3982:10b] 一言言って1.000000秒待つことを3回繰り返すだけの簡単なお仕事です
2007-11-16 02:11:50.275 profile[3982:10b] 一言言って1.000000秒待つことを3回繰り返すだけの簡単なお仕事です
2007-11-16 02:11:51.276 profile[3982:10b] 一言言って1.000000秒待つことを3回繰り返すだけの簡単なお仕事です
2007-11-16 02:11:52.277 profile[3982:10b] finished!
2007-11-16 02:11:52.278 profile[3982:10b] process time: 3.003400 (sec)

#import <Foundation/Foundation.h>

@interface Profiler : NSObject
{
    id target;
}
- (id)initWithObject:(id)aTarget;
- (void)setTarget:(id)aTarget;
@end

@implementation Profiler
- (id)initWithObject:(id)aTarget
{
    [super init];
    target = aTarget;
    return self;
}
- (id)init
{
    return [self initWithObject:nil];
}
- (void)setTarget:(id)aTarget
{
    target = aTarget;
    return;
}
- (void)profile:(NSInvocation *)anInvocation
{
    NSLog(@"start profiling [%@ %s]", [target className], [anInvocation selector]);
    NSDate *startTime = [NSDate date];
    [anInvocation invokeWithTarget:target];
    NSDate *endTime = [NSDate date];
    NSLog(@"finished!");
    NSLog(@"process time: %f (sec)", [endTime timeIntervalSinceDate:startTime]);
    return;
}
// メッセージ転送によって「対象の関数と同じ引数でプロファイル」を実現する
// Profilerの実装していないメッセージが来たら、
// 実行時間の計測をしつつ実際の処理はtargetに移譲
- (NSMethodSignature *)methodSignatureForSelector:(SEL)aSelector
{
    if ([target respondsToSelector:aSelector])
        return [target methodSignatureForSelector:aSelector];
    else
        return [super methodSignatureForSelector:aSelector];
}
- (BOOL)respondsToSelector:(SEL)aSelector
{
    if ([super respondsToSelector:aSelector])
        return YES;
    if ([self methodForSelector:aSelector] != (IMP)NULL)
        return YES;
    if ([target respondsToSelector:aSelector])
        return YES;
    return NO;
}
- (void)forwardInvocation:(NSInvocation *)anInvocation
{
    if ([target respondsToSelector:[anInvocation selector]])
    {
        [self profile:anInvocation];
    }
    else
    {
        [super forwardInvocation:anInvocation];
    }
    return;
}
//--- メッセージ転送処理ここまで
@end

@interface TestClass : NSObject
{
    NSTimeInterval interval;
}
- (void)func:(int)times;
@end

@implementation TestClass
- (id)init
{
    [super init];
    interval = 1.0;
    return self;
}
- (void)func:(int)times
{
    int i;
    for (i = 0; i < times; i++)
    {
        NSLog(@"一言言って%f秒待つことを%d回繰り返すだけの簡単なお仕事です", interval, times);
        [NSThread sleepForTimeInterval:interval];
        // Xcode 2.x だとスレッドのスリープはこっち
        // [NSThread sleepUntilDate:[NSDate dateWithTimeIntervalSinceNow:interval]];
    }
}
@end

int main(int argc, const char *argv[])
{
    NSAutoreleasePool *pool = [NSAutoreleasePool new];
    
    id testTarget = [TestClass new];
    Profiler *profiler = [[Profiler alloc] initWithObject:testTarget];

    //profilerに本来testTargetが受けとるはずのメッセージを送ってやる
    [profiler func:3];

    [pool release];
    return 0;
}

[ Objective-C ] [ download code ] ]

faultier's comment on リストを逆順に表示

リストを逆順に表示 (Nested Flatten)

reverseObjectEnumeratorで。

#import <Foundation/Foundation.h>

int main()
{
    NSAutoreleasePool *pool = [NSAutoreleasePool new];
    NSArray *givenList = [NSArray arrayWithObjects:@"a", @"b", @"c", @"d", @"e", nil];
    for (id obj in [givenList reverseObjectEnumerator]) NSLog(obj);
    [pool release];
    return 0;
}

[ Objective-C ] [ download code ] ]

faultier's comment on ファイル更新の監視

ファイル更新の監視 (Nested Flatten)

NSRunLoopで回すのはいいのかどうか分かりません。NSTimerを使いたくてこの形に。
一応Leopardタグ付けますがfor ~ in ~のところをNSEnumeratorを使うように書き換えればXcode2.xでもコンパイルできるはず。
あと、Leopardだとそのままずばりファイルの監視をするFSEventというAPIがあります。
TimeMachineが使ってるやつ。これはCなんですが、詳細は参考ページ参照で。

#import <Foundation/Foundation.h>

#define WATCH_PATH @"target path"
#define WATCH_FILE_ATTR @"target file atrributes"
#define WATCH_FILE_MODIFIED @"target file modified"

@interface Watcher : NSObject
{
    NSMutableDictionary    *targetPathes;
    NSFileManager        *manager;
    NSMutableDictionary    *fileAttributes;
}
- (id)initWithTargetPathes:(NSArray *)pathes;
- (void)checkModified;
@end

@implementation Watcher
- (id)initWithTargetPathes:(NSArray *)pathes;
{
    targetPathes    = [NSMutableDictionary dictionary];
    manager            = [NSFileManager defaultManager];
    fileAttributes    = [NSMutableDictionary dictionary];
    for (NSString *path in pathes)
    {
        [targetPathes setValue:path forKey:path];
        NSDictionary *status = [manager fileAttributesAtPath:path traverseLink:YES];
        if (status) [fileAttributes setValue:status forKey:path];
    }
    return self;
}
- (void)sendNotification:(NSString *)aPath withStatus:(id)aStatus
{
    NSString *message = [NSString stringWithFormat:@"'%@' is modified!", aPath];
    [[NSNotificationCenter defaultCenter] postNotificationName:WATCH_FILE_MODIFIED
                                                        object:message
                                                      userInfo:aStatus];
    return;
}
- (void)checkModified
{
    for (NSString *path in targetPathes)
    {
        NSAutoreleasePool *pool    = [NSAutoreleasePool new];
        NSDictionary *_prev        = [fileAttributes objectForKey:path];
        NSDictionary *_current    = [manager fileAttributesAtPath:path traverseLink:YES];
        if (_prev || _current)
        {
            if (!_current)
            {
                [fileAttributes removeObjectForKey:path];
                [self sendNotification:path withStatus:nil];
            }
            else if (![_current isEqual:_prev])
            {
                [fileAttributes setObject:[_current copy] forKey:path];
                [self sendNotification:path withStatus:_current];
            }
        }
        [pool release];
    }
    return;
}
@end

@interface FileStatusLogger : NSObject
{
    NSNotificationCenter* center;
}
- (id)initWithNotificationCenter:(NSNotificationCenter *)aCenter;
- (void)log:(NSNotification *)notice;
@end

@implementation FileStatusLogger
- (id)initWithNotificationCenter:(NSNotificationCenter *)aCenter
{
    [super init];
    [aCenter addObserver:self selector:@selector(log:) name:WATCH_FILE_MODIFIED object:nil];
    return self;
}
- (id)init
{
    return [self initWithNotificationCenter:[NSNotificationCenter defaultCenter]];
}
- (void)log:(NSNotification *)notice;
{
    NSLog(@"%@", [notice object]);
    return;
}
@end

void usage(name)
{
    printf("Usage: %s <interval> <duration> <path1> [<path2>...]\n", name);
    exit(1);
}

int main(int argc, char *argv[])
{
    if (argc < 4) usage(argv[0]);
    
    NSAutoreleasePool *pool    = [NSAutoreleasePool new];
    NSMutableArray *pathes    = [NSMutableArray array];
    NSTimeInterval interval    = strtod(argv[1], NULL);
    NSTimeInterval duration    = strtod(argv[2], NULL);
    
    if (interval <= 0) usage(argv[0]);

    int i;
    for (i = 3; i < argc; i++)
    {
        [pathes addObject:[NSString stringWithCString:argv[i]]];
    }

    Watcher *watcher            = [[Watcher alloc] initWithTargetPathes:pathes];
    FileStatusLogger *logger    = [FileStatusLogger new];
    NSTimer *timer                = [NSTimer scheduledTimerWithTimeInterval:interval
                                                                   target:watcher
                                                                 selector:@selector(checkModified)
                                                                 userInfo:nil
                                                                  repeats:YES];
    NSLog(@"monitoring start");
    [[NSRunLoop currentRunLoop] addTimer:timer forMode:NSDefaultRunLoopMode];
    if (duration > 0)
    {
        [[NSRunLoop currentRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceNow:duration]];
    }
    else
    {
        [[NSRunLoop currentRunLoop] run];
    }
    NSLog(@"monitoring end");
    
    [pool release];

    return 0;
}

[ Objective-C ] [ download code ] ]

Psychs's comment on 重複無し乱数

重複無し乱数 (Nested Flatten)

#import <Foundation/Foundation.h>

@interface NSArray (Bingo)
+ (NSArray*)bingo:(int)n;
@end

@implementation NSArray (Bingo)

+ (NSArray*)bingo:(int)n
{
  NSMutableArray* array = [NSMutableArray array];
  int i;
  for (i=1; i<=n; i++) [array addObject:[NSNumber numberWithInteger:i]];

  NSMutableArray* result = [NSMutableArray array];
  for (i=1; i<=n; i++) {
    int size = n - i + 1;
    int index = rand() % size;
    [result addObject:[array objectAtIndex:index]];
    [array removeObjectAtIndex:index];
  }
  return result;
}

@end

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

  srand(time(0));
  NSLog(@"%@", [NSArray bingo:3]);
  NSLog(@"%@", [NSArray bingo:10]);
  
  [pool release];
  return 0;
}

[ Objective-C ] [ download code ] ]

Psychs's comment on 隣り合う二項の差

隣り合う二項の差 (Nested Flatten)

#import <Foundation/Foundation.h>

@interface NSMutableArray (IntegerAccess)
- (void)addInteger:(int)val;
- (int)integerAt:(int)index;
@end

@implementation NSMutableArray (IntegerAccess)

- (void)addInteger:(int)val
{
  [self addObject:[NSNumber numberWithInteger:val]];
}

- (int)integerAt:(int)index
{
  return [[self objectAtIndex:index] intValue];
}

@end

@interface NSArray (Diff)
- (NSArray*)diff;
@end

@implementation NSArray (Diff)

- (NSArray*)diff
{
  NSMutableArray* result = [NSMutableArray array];
  id prev = nil;
  for (id obj in self) {
    if (prev) [result addInteger:[obj intValue] - [prev intValue]];
    prev = obj;
  }
  return result;
}

@end

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

  NSMutableArray* array = [NSMutableArray array];
  [array addInteger:3];
  [array addInteger:1];
  [array addInteger:4];
  [array addInteger:1];
  [array addInteger:5];
  [array addInteger:9];
  [array addInteger:2];
  [array addInteger:6];
  [array addInteger:5];

  NSLog(@"%@", array);
  NSLog(@"%@", [array diff]);
  
  [pool release];
  return 0;
}

[ Objective-C ] [ download code ] ]

Psychs's comment on 与えられた文字列でピラミッド

与えられた文字列でピラミッド (Nested Flatten)

#include <stdio.h>
#include <string.h>

void print_pyramid(const char* s)
{
  int i, j;
  int n = strlen(s);
  
  for (i=0; i<n; i++) {
    for (j=n-i-2; j>=0; j--) putchar(' ');
    for (j=n-i-1; j<n-1; j++) {
      putchar(s[j]);
      putchar(' ');
    }
    putchar(s[j]);
    puts("");
  }
}

int main(int argc, char** argv)
{
  print_pyramid("hoge");
  print_pyramid("abracadabra");
  return 0;
}

[ Objective-C ] [ download code ] ]

Psychs's comment on 格子点の列挙

格子点の列挙 (Nested Flatten)

デバッグ用のコードが残っていたので削除しました。

#import <Foundation/Foundation.h>

@interface MyPoint : NSObject
{
  int x;
  int y;
  long distance;
}

+ (MyPoint*)pointWithX:(int)x y:(int)y;
- (int)x;
- (int)y;
- (long)distance;
- (NSComparisonResult)compareWithPoint:(MyPoint*)rhs;

@end

@implementation MyPoint

- (int)x { return x; }
- (int)y { return y; }
- (long)distance { return distance; }

- (void)setX:(int)px y:(int)py
{
  x = px;
  y = py;
  distance = x*x + y*y;
}

+ (MyPoint*)pointWithX:(int)x y:(int)y
{
  MyPoint* obj = [[[MyPoint alloc] init] autorelease];
  [obj setX:x y:y];
  return obj;
}

- (NSComparisonResult)compareWithPoint:(MyPoint*)rhs
{
  long d = [rhs distance];
  if (distance < d) return NSOrderedAscending;
  if (distance > d) return NSOrderedDescending;
  
  int rx = [rhs x];
  int ry = [rhs y];
  if (y >= 0) {
    if (ry >= 0) {
      return x < rx ? NSOrderedDescending : NSOrderedAscending;
    } else {
      return NSOrderedAscending;
    }
  } else {
    if (ry >= 0) {
      return NSOrderedDescending;
    } else {
      return x < rx ? NSOrderedAscending : NSOrderedDescending;
    }
  }
}

@end

int main(int argc, char** argv)
{
  NSAutoreleasePool* pool = [NSAutoreleasePool new];
  
  NSMutableArray* input = [NSMutableArray array];
  int r = 25;
  int i, j;
  for (i=-r; i<=r; i++) {
    for (j=-r; j<r; j++) {
      [input addObject:[MyPoint pointWithX:i y:j]];
    }
  }

  NSArray* result = [input sortedArrayUsingSelector:@selector(compareWithPoint:)];
  
  printf("count: %d\n", [result count]);
  for (id p in result) {
    printf("%3d, %3d\n", [p x], [p y]);
  }
  
  [pool release];
  return 0;
}

[ Objective-C ] [ download code ] ]

Psychs's comment on 格子点の列挙

格子点の列挙 (Nested Flatten)

あらかじめ点の配列を作っておいてソートするという力業。

#import <Foundation/Foundation.h>

@interface MyPoint : NSObject
{
  int x;
  int y;
  long distance;
}

+ (MyPoint*)pointWithX:(int)x y:(int)y;
- (int)x;
- (int)y;
- (long)distance;
- (NSComparisonResult)compareWithPoint:(MyPoint*)rhs;

@end

@implementation MyPoint

- (int)x { return x; }
- (int)y { return y; }
- (long)distance { return distance; }

- (void)setX:(int)px y:(int)py
{
  x = px;
  y = py;
  distance = x*x + y*y;
}

+ (MyPoint*)pointWithX:(int)x y:(int)y
{
  MyPoint* obj = [[[MyPoint alloc] init] autorelease];
  [obj setX:x y:y];
  return obj;
}

- (NSComparisonResult)compareWithPoint:(MyPoint*)rhs
{
  long d = [rhs distance];
  if (distance < d) return NSOrderedAscending;
  if (distance > d) return NSOrderedDescending;
  
  int rx = [rhs x];
  int ry = [rhs y];
  if (y >= 0) {
    if (ry >= 0) {
      return x < rx ? NSOrderedDescending : NSOrderedAscending;
    } else {
      return NSOrderedAscending;
    }
  } else {
    if (ry >= 0) {
      return NSOrderedDescending;
    } else {
      return x < rx ? NSOrderedAscending : NSOrderedDescending;
    }
  }
}

@end

int main(int argc, char** argv)
{
  NSAutoreleasePool* pool = [NSAutoreleasePool new];
  
  NSMutableArray* input = [NSMutableArray array];
  int r = 25;
  int i, j;
  for (i=-r; i<=r; i++)
    for (j=-r; j<r; j++)
      [input addObject:[MyPoint pointWithX:i y:j]];

  NSArray* result = [input sortedArrayUsingSelector:@selector(compareWithPoint:)];
  
  printf("count: %d\n", [result count]);
  i = 0;
  for (id p in result) {
    printf("%3d, %3d\n", [p x], [p y]);
    i++;
  }
  
  [pool release];
  return 0;
}

[ Objective-C ] [ download code ] ]