EXC_BAD_ACCESS利用の場合NSOutlineView

Question

いることができるよう、概要を表示したタイプのディレクトリは、今私は編集の例ではApple社からそれを動作させるためにからディレクトリを設定しまれる場合を除き、拡大のノードを取得しま"EXEC_BAD_ACCESS"からNSOutlineViewクラスです。

こちらは、ヘッダファイル:

#import <Cocoa/Cocoa.h>

@interface SMLDirectoryDataSource : NSObject {
    NSString *rootDirectory;
}

- (int)outlineView:(NSOutlineView *)outlineView numberOfChildrenOfItem:(id)item;
- (BOOL)outlineView:(NSOutlineView *)outlineView isItemExpandable:(id)item;
- (id)outlineView:(NSOutlineView *)outlineView
            child:(int)index
           ofItem:(id)item;
- (id)outlineView:(NSOutlineView *)outlineView objectValueForTableColumn:(NSTableColumn *)tableColumn
           byItem:(id)item;
- (void) setRootDirectory:(NSString *)directory;

@end

@interface SMLDirectoryDataItem : NSObject
{
    NSString *relativePath, *fullPath;
    SMLDirectoryDataItem *parent;
    NSMutableArray *children;
}

//+ (SMLDirectoryDataItem *)rootItem;
- (int)numberOfChildren;// Returns -1 for leaf nodes
- (SMLDirectoryDataItem *)childAtIndex:(int)n;// Invalid to call on leaf nodes
- (NSString *)fullPath;
- (NSString *)relativePath;

@end

こちらは実行ファイル:

#import "SMLDirectoryDataSource.h"


@implementation SMLDirectoryDataSource
- (id)initWithDirectory:(NSString *)path
{
    rootDirectory = path;
    return self;
}

- (int)outlineView:(NSOutlineView *)outlineView numberOfChildrenOfItem:(id)item
{
    return (item == nil) ? 1 : [item numberOfChildren];
}

- (BOOL)outlineView:(NSOutlineView *)outlineView isItemExpandable:(id)item
{
    return (item == nil) ? NO : ([item numberOfChildren] != -1);
}

- (id)outlineView:(NSOutlineView *)outlineView
            child:(int)index
           ofItem:(id)item
{
    NSLog(@"hi there");
    if(rootDirectory == nil)
            rootDirectory = @"/";
    NSLog(rootDirectory);
    if(item == nil){
        SMLDirectoryDataItem *item = [[SMLDirectoryDataItem alloc] initWithPath:rootDirectory parent:NULL];
        return item;
        [item release];
    }
    else
        return [(SMLDirectoryDataItem *)item childAtIndex:index];
}
/*(
- (id)outlineView:(NSOutlineView *)outlineView
objectValueForTableColumn:(NSTableColumn *)tableColumn
           byItem:(id)item
{
    if(rootDirectory == nil)
        rootDirectory = @"/";
    return rootDirectory;
}
*/
- (void)setRootDirectory:(NSString *)directory
{
    rootDirectory = directory;
}

- (id)outlineView:(NSOutlineView *)outlineView objectValueForTableColumn:(NSTableColumn *)tableColumn byItem:(id)item {
    if(item == nil)
        return rootDirectory;
    else
        return (id)[(SMLDirectoryDataItem *)item relativePath];
}

- (BOOL)outlineView:(NSOutlineView *)outlineView shouldEditTableColumn:(NSTableColumn *)tableColumn item:(id)item {
    return NO;
}

@end

@implementation SMLDirectoryDataItem

//static SMLDirectoryDataItem *rootItem = nil;
#define IsALeafNode ((id)-1)

- (id)initWithPath:(NSString *)path parent:(SMLDirectoryDataItem *)obj
{
    fullPath = [path copy];
    if (self = [super init])
    {
        relativePath = [[path lastPathComponent] copy];
        parent = obj;
    }
    return self;
}


/*+ (SMLDirectoryDataItem *)rootItem
{
    if (rootItem == nil) rootItem = [[SMLDirectoryDataItem alloc] initWithPath:@"/" parent:nil];
    return rootItem;
}*/


// Creates, caches, and returns the array of children
// Loads children incrementally
- (NSArray *)children
{
    if (children == NULL) {
        NSFileManager *fileManager = [NSFileManager defaultManager];
        //NSString *fullPath = [self fullPath];
        BOOL isDir, valid = [fileManager fileExistsAtPath:fullPath isDirectory:&isDir];
        if (valid && isDir) {
            NSArray *array = [fileManager contentsOfDirectoryAtPath:fullPath error:NULL];
            if (!array) {   // This is unexpected
                children = [[NSMutableArray alloc] init];
            } else {
                NSInteger cnt, numChildren = [array count];
                children = [[NSMutableArray alloc] initWithCapacity:numChildren];
                NSString *filename = [[NSString alloc] init];
                for (cnt = 0; cnt < numChildren; cnt++) {
                    filename = [fullPath stringByAppendingPathComponent:[array objectAtIndex:cnt]];
                    SMLDirectoryDataItem *item = [[SMLDirectoryDataItem alloc] initWithPath:filename parent:self];
                    [children addObject:item];
                    [item release];
                }
                [filename release];
            }
        } else {
            NSLog(@"is a leaf... strange");
            children = IsALeafNode;
        }
    }
    return children;
}


- (NSString *)relativePath
{
    return relativePath;
}


- (NSString *)fullPath
{
    // If no parent, return our own relative path
    //if (parent == nil) return relativePath;

    // recurse up the hierarchy, prepending each parent’s path
    //return [[parent fullPath] stringByAppendingPathComponent:relativePath];
    return fullPath;
}

- (SMLDirectoryDataItem *)childAtIndex:(int)n
{
    return [[self children] objectAtIndex:n];
}

- (int)numberOfChildren
{
    id tmp = [self children];
    return (tmp == IsALeafNode) ? (0) : [tmp count];
}


- (void)dealloc
{
    if (children != IsALeafNode) [children release];
    [relativePath release];
    [super dealloc];
}

@end

更新: 最新のコードの最新バージョン

Answer 1

すな管理メモリのを修正

(1)このコンポーネントはすべて解放されます。AutoreleaseのSMLDirectoryDataItemインスタンス.

    return (item == nil) ? [[SMLDirectoryDataItem alloc] initWithPath:rootDirectory parent:nil] : [item childAtIndex:index];

(2)お客さまにinitWithPath親会:方法は、次のコードは保有しませんの文字列になります。のautoreleaseプールでリリースで水気を切る。これ先でクラッシュ:

    relativePath = [path lastPathComponent];

こ:

http://developer.apple.com/mac/library/DOCUMENTATION/Cocoa/Conceptual/MemoryMgmt/MemoryMgmt.html

あの追加問題、コードの更新をコード):

(1)まず、こ---

#define IsALeafNode ((id)-1)

....完全に間違っています。すぐ-1くことを期待する。近い保/autoreleases又はその他のメッセージ。

(2)また、まもな管理メモリのを修正お-setRootDirectory:メソッドは固定の文字列になります。私はあなたが使用@property、@の合成セッタ/ゲッター.

（3）-子どもの方法が漏れた文字列のようにいる。具体的には、ファイル名の変数の使い方は間違っています。