huaxun/LekangGuard/Common/CJFileUtility.m

//
//  CJFileUtility.m
//
//  Created by chenjian on 4/25/12.
//  Copyright (c) 2012 cj. All rights reserved.
//

#import "CJFileUtility.h"
#import <sys/xattr.h>

@implementation CJFileUtility

+ (BOOL)addSkipBackupAttributeToItemAtPath:(NSString *)path
{
    NSURL *url = [NSURL fileURLWithPath:path];
    return [url setResourceValue:[NSNumber numberWithBool:YES] forKey:NSURLIsExcludedFromBackupKey error:nil];
}

+ (BOOL)fileExists:(NSString *)fileName
{
    return [[NSFileManager defaultManager] fileExistsAtPath:fileName];
}

+ (long long) fileSizeAtPath:(NSString*)filePath {
    NSFileManager* manager = [NSFileManager defaultManager];
    if ([manager fileExistsAtPath:filePath]){
        return [[manager attributesOfItemAtPath:filePath error:nil] fileSize];
    }
    return 0;
}

+ (BOOL)writeToFile:(NSString *)fileName data:(NSData*)data
{
    return [data writeToFile:fileName atomically:YES];
}
+(BOOL)appendToFile:(NSString *)fileName data:(NSData*)data
{
    if ([CJFileUtility fileExists:fileName]) {
        // 取得修改的文件句柄
        NSFileHandle *fileHandler = [NSFileHandle fileHandleForUpdatingAtPath:fileName];
        // 移动指针到文件末尾
        [fileHandler seekToEndOfFile];
        // 追加内容
        [fileHandler writeData:data];
        
        return YES;
    } else {
        return [data writeToFile:fileName atomically:YES];
    }
}
+(BOOL)deleteFile:(NSString *)fileName
{
    return [[NSFileManager defaultManager] removeItemAtPath:fileName error:nil];
}
+(BOOL)renameFile:(NSString *)oldName newName:(NSString*)newName
{
    if ([CJFileUtility fileExists:oldName]) {
        [CJFileUtility deleteFile:newName];
        return [[NSFileManager defaultManager] moveItemAtPath:oldName toPath:newName error:nil];
    }
    return NO;
}
+ (BOOL)copyFile:(NSString *)srcFile to:(NSString *)dstFile
{
    if ([CJFileUtility fileExists:srcFile]) {
        return [[NSFileManager defaultManager] copyItemAtPath:srcFile toPath:dstFile error:nil];
    }
    return NO;
}
+ (BOOL)moveFile:(NSString *)srcFile to:(NSString *)dstFile
{
    if ([CJFileUtility fileExists:srcFile]) {
        return [[NSFileManager defaultManager] moveItemAtPath:srcFile toPath:dstFile error:nil];
    }
    return NO;
}
+ (BOOL)createPath:(NSString *)path
{
    return [[NSFileManager defaultManager] createDirectoryAtPath:path withIntermediateDirectories:YES attributes:nil error:nil];
}
+(NSString *)documentsPath
{
    NSArray *paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);
    return [paths objectAtIndex:0];
}


+ (NSString *)cachePath
{
    NSArray *paths=NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask,YES);
    return [paths objectAtIndex:0];
}

+ (NSString *)cachePathWithFile:(NSString *)fileName
{
    return [[CJFileUtility cachePath] stringByAppendingPathComponent:fileName];
}

+(NSString *)tempPath
{
    return [NSString stringWithFormat:@"%@/%@", NSHomeDirectory(), @"tmp"];
}

+ (NSString *)documentsPathSubDir:(NSString*)subDir
{
    NSString* path = [[CJFileUtility documentsPath] stringByAppendingPathComponent:subDir];
    if (![[NSFileManager defaultManager] fileExistsAtPath:path]) {
        [[NSFileManager defaultManager] createDirectoryAtPath:path withIntermediateDirectories:YES attributes:nil error:nil];
    }
    return path;
}
+ (NSString *)documentsPathSubDir:(NSString*)subDir andFile:(NSString*)fileName
{
    NSString* path = [[[[CJFileUtility documentsPath] stringByAppendingPathComponent:subDir] stringByAppendingPathComponent:fileName] stringByDeletingLastPathComponent];
    
    if (![[NSFileManager defaultManager] fileExistsAtPath:path]) {
        [[NSFileManager defaultManager] createDirectoryAtPath:path withIntermediateDirectories:YES attributes:nil error:nil];
    }
    return [path stringByAppendingPathComponent:[fileName lastPathComponent]];
}
+ (NSString *)documentsPathSubDir:(NSString*)subDir andUrl:(NSString*)url {
    NSString * fileName = [url lastPathComponent];
    return [CJFileUtility documentsPathSubDir:subDir andFile:fileName];
}

+ (NSString *)changeFileExt:(NSString *)fileName ext:(NSString *)ext
{
    NSString *noExt = [fileName stringByDeletingPathExtension];
    return [noExt stringByAppendingPathExtension:ext];
}

+ (NSString *)changeFilePath:(NSString *)path fileName:(NSString *)fileName
{
    NSString *filePath = [path stringByDeletingLastPathComponent];
    return [filePath stringByAppendingPathComponent:fileName];
}

@end