NSFileManager文件管理

#import "TestViewController.h"

@implementation TestViewController

- (void)viewDidLoad {
[super viewDidLoad];

//创建与删除：
//创建文件管理器
NSFileManager *fileManager = [NSFileManager defaultManager];
//获取路径
//参数NSDocumentDirectory要获取哪种路径 —— 获取    /Documents路径
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];//去处需要的路径
NSLog(@"%@",documentsDirectory);

//更改到待操作的目录下
[fileManager changeCurrentDirectoryPath:[documentsDirectory stringByExpandingTildeInPath]];

//创建文件fileName文件名称，contents文件的内容，如果开始没有内容可以设置为nil，attributes文件的属性，初始为nil
[fileManager createFileAtPath:@"fileName" contents:nil attributes:nil];
//删除待删除的文件
[fileManager removeItemAtPath:@"createdNewFile" error:nil];

//写入数据：
//获取文件路径
NSString *path = [documentsDirectory stringByAppendingPathComponent:@"fileName"];

//待写入的数据
NSString *temp = @"Hello friend";
int data0 = 100000;
float data1 = 23.45f;

//创建数据缓冲
NSMutableData *writer = [[NSMutableData alloc] init];

//将字符串添加到缓冲中
[writer appendData:[temp dataUsingEncoding:NSUTF8StringEncoding]];

//将其他数据添加到缓冲中
[writer appendBytes:&data0 length:sizeof(data0)];
[writer appendBytes:&data1 length:sizeof(data1)];

//将缓冲的数据写入到文件中
[writer writeToFile:path atomically:YES];
[writer release];

//读取数据：
int gData0;
float gData1;
NSString *gData2;

NSData *reader = [NSData dataWithContentsOfFile:path];
gData2 = [[NSString alloc] initWithData:[reader subdataWithRange:NSMakeRange(0, [temp length])]
encoding:NSUTF8StringEncoding];
[reader getBytes:&gData0 range:NSMakeRange([temp length], sizeof(gData0))];
[reader getBytes:&gData1 range:NSMakeRange([temp length] + sizeof(gData0), sizeof(gData1))];

NSLog(@"gData0:%i  gData1:%0.2f gData2:%@", gData0, gData1, gData2);

/*
//读取工程中的文件：
//读取数据时，要看待读取的文件原有的文件格式，是字节码还是文本，我经常需要重文件中读取字节码，所以我写的是读取字节文件的方式。
//用于存放数据的变量，因为是字节，所以是ＵInt8
UInt8 b = 0;

//获取文件路径
NSString *path8 = [[NSBundle mainBundle] pathForResource:@"fileName" ofType:@""];

//获取数据
NSData *reader8 = [NSData dataWithContentsOfFile:path8];

//获取字节的个数
int length = [reader8 length];
NSLog(@"------->bytesLength:%d", length);
for(int i = 0; i < length; i++)
{
//读取数据
[reader8 getBytes:&b range:NSMakeRange(i, sizeof(b))];
NSLog(@"-------->data%d:%d", i, b);

}

*/

/*

//创建一个NSFileManager，创建自定义文件夹myTest
NSFileManager *fileManger = [NSFileManager defaultManager];
NSString *myDirectory = [documentsDirectory stringByAppendingPathComponent:@"myTest"];
BOOL ok = [fileManger createDirectoryAtPath:myDirectory attributes:nil];

//取得一个目录下得所有文件名：（如上面的myDirectory)可用
NSArray *file = [fileManger subpathsOfDirectoryAtPath: myDirectory error:nil];
//或
//NSArray *files = [fileManager subpathsAtPath: myDirectory ];

//读取某个文件:
NSData *data = [fileManger contentsAtPath:myFilePath];//myFilePath是包含完整路径的文件名
//或直接用NSData 的类方法：
//NSData *data = [NSData dataWithContentOfPath:myFilePath];

//保存某个文件:
//可以用 NSFileManager的
- (BOOL)createFileAtPath:(NSString *)path contents:(NSData *)data attributes:(NSDictionary *)attr;
//或 NSData 的
- (BOOL)writeToFile:(NSString *)path atomically:(BOOL)useAuxiliaryFile;
- (BOOL)writeToFile:(NSString *)path options:(NSUInteger)writeOptionsMask error:(NSError **)errorPtr;
*/

//	NSString *filePath = [[NSBundle mainBundle] bundlePath];//获得app的路径
//2011-08-24 09:52:30.168 Test[619:207] /Users/ibokanwisdom06/Library/Application Support/iPhone Simulator/4.2/Applications/E91BDD30-2DB9-4982-BBCA-EE51A65091BA/Test.app
//	NSString *filePath = [[NSBundle mainBundle] executablePath];//获得test的路径
//2011-08-24 09:52:54.882 Test[649:207] /Users/ibokanwisdom06/Library/Application Support/iPhone Simulator/4.2/Applications/E91BDD30-2DB9-4982-BBCA-EE51A65091BA/Test.app/Test
//	NSString *filePath = [[NSBundle mainBundle] privateFrameworksPath];//获得Frameworks的路径
//	NSLog(@"%@",filePath);

}

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

@end