IOS开发 沙盒中的文件操作和文件系统NSFilemanager的操作

1、获取程序的Home目录

      NSString  *path = NSHomeDirectory();

      NSLog(@"path:%@",path);

      打印结果：

 

 

   2012-07-11 11:18:16.291 TestProject[2387:f803] path:/Users/username/Library/Application Support/iPhone Simulator/5.1/Applications/BAE91297-A4C6-4DDC-A9DA-7B790B36CE7A

 

 

 

   真机上的目录是：

   2012-06-17 14:25:47.059 IosSandbox[4281:f803] /var/mobile/Applications/3B8EC78A-5EEE-4C2F-B0CB-4C3F02B996D2

   可见，真机上的目录是/var/mobile/Applications/这个目录下的，和模拟器不一样。这个是Home目录，其他的子目录和模拟器一样。

2、获取Document目录

   NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 

   NSString *path = [paths objectAtIndex:0]; 

   NSLog(@"path:%@", path); 

   打印结果： 

 

 

   2012-07-11 11:21:22.879 TestProject[2417:f803] path:/Users/username/Library/Application Support/iPhone Simulator/5.1/Applications/BAE91297-A4C6-4DDC-A9DA-7B790B36CE7A/Documents

3、获取Cache目录

 

   NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES); 

   NSString *path = [paths objectAtIndex:0]; 

   NSLog(@"path:%@", path); 

   打印结果：

 

   2012-07-11 11:13:36.162 TestProject[2310:f803] path:/Users/username/Library/Application Support/iPhone Simulator/5.1/Applications/BAE91297-A4C6-4DDC-A9DA-7B790B36CE7A/Library/Caches

4、获取Library目录

   NSArray *paths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES); 

 

 
 

   NSString *path = [paths objectAtIndex:0]; 

 

 
 

   NSLog(@"path:%@", path);

 

 
 

   打印结果：

 

 

   2012-07-11 11:14:41.138 TestProject[2337:f803] path:/Users/username/Library/Application Support/iPhone Simulator/5.1/Applications/BAE91297-A4C6-4DDC-A9DA-7B790B36CE7A/Library

 

 

[b]5、获取Tmp目录

 

   NSString *path = NSTemporaryDirectory(); 

   NSLog(@"%@",
path);

   打印结果：

 
 

 
 

 
 

  2012-07-11 11:16:09.438 TestProject[2358:f803] path:/var/folders/hj/8sgyk0f555l1z_n95p2b2kp00000gn/T/
   

 

 

 

 

6、写入文件

   NSArray  *paths  =  NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);

   NSString *docDir = [paths objectAtIndex:0];

   if(!docDir) {

        NSLog(@"Documents 目录未找到");

   }

   NSArray *array = [[NSArray alloc] initWithObjects:@"内容",@"content",nil];

   NSString *filePath = [docDir stringByAppendingPathComponent:@"testFile.txt"];

   [array writeToFile:filePath atomically:YES];

7、读取文件

 

   NSArray  *paths  =  NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);

   NSString *docDir = [paths objectAtIndex:0];

   NSString *filePath = [docDir stringByAppendingPathComponent:@"testFile.txt"];

   NSArray *array = [[NSArray alloc] initWithContentsOfFile:filePath];

   NSLog(@"%@",array);

8、NSFilemanager操作

NSError *error;

    

    

    //在Documents目录下创建test目录

    NSArray *path =
NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask, YES);
   
NSLog(@"%@",path);

    
   
NSString *documentsDirectory = [path
objectAtIndex:0];
   
NSLog(@"%@",documentsDirectory);

    NSFileManager *fileMgr = [NSFileManager
defaultManager];
   
NSString *testDirectory = [documentsDirectory
stringByAppendingPathComponent:@"test"];

    [fileMgr createDirectoryAtPath:testDirectory
withIntermediateDirectories:YES
attributes:nil
error:&error];

    

    

    //在test目录下创建文件
   
NSString *testPath = [testDirectory
stringByAppendingPathComponent:@"test00.txt"];
   
NSString *testPath2 = [testDirectory
stringByAppendingPathComponent:@"test22.txt"];
   
NSString *testPath3 = [testDirectory
stringByAppendingPathComponent:@"test33.txt"];

    

    
   
NSString *string =
@"这是要写入的内容";

    [fileMgr createFileAtPath:testPath
contents:[string dataUsingEncoding:NSUTF8StringEncoding]
attributes:nil];

    [fileMgr createFileAtPath:testPath2
contents:[string dataUsingEncoding:NSUTF8StringEncoding]
attributes:nil];

    [fileMgr createFileAtPath:testPath3
contents:[string dataUsingEncoding:NSUTF8StringEncoding]
attributes:nil];

    

    //获取目录列里所有文件名，两个方法都可以实现打印隐藏文件
   
NSArray *files = [fileMgr
subpathsOfDirectoryAtPath:testDirectory error:&error];
   
NSLog(@"%@",files);

    
   
NSArray *files2 = [fileMgr
subpathsAtPath:testDirectory];
   
NSLog(@"%@",files2);

    

    

    //fileManager使用操作当前目录

    [fileMgr changeCurrentDirectoryPath:[documentsDirectory
stringByExpandingTildeInPath]];

    //创建文件名称，文件内容，attributes文件属性

    NSString *fileName =
@"testFileNSFileManager.txt";

    NSArray *array = [[NSArray
alloc]
initWithObjects:@"hello world",@"hello world1",@"hello world2",
nil];

    [fileMgr createFileAtPath:fileName
contents:array attributes:nil];

    

    

    //删除文件

    //[fileMgr removeItemAtPath:fileName error:&error];

    

    

    

    //混合数据的写入

    //获取文件路径
   
NSString *writePath = [documentsDirectory
stringByAppendingPathComponent:fileName];

    //待写入的内容
   
NSString *temp = @"hello,world";
   
int dataInt = 1234;
   
float dataFloat =
3.14f;

    //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:&dataInt
length:sizeof(dataInt)];
    [writer
appendBytes:&dataFloat
length:sizeof(dataFloat)];

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

    

    

    //混合数据的读取

    
   
int intData;
   
float floatData =
0.0;
   
NSString *stringData;

    
   
NSData *reader = [NSData
dataWithContentsOfFile:writePath];

    stringData = [[NSString
alloc] initWithData:[reader
subdataWithRange:NSMakeRange(0, [temp
length])] encoding:NSUTF8StringEncoding];
    [reader
getBytes:&intData
range:NSMakeRange([temp
length], sizeof(intData))];
    [reader
getBytes:&floatData
range:NSMakeRange([temp
length] + sizeof(intData),
sizeof(floatData))];

    NSLog(@"stringData:%@ intData:%d floatData:%f", stringData, intData, floatData);