iOS学习之iOS沙盒(sandbox)机制和文件操作(二)

1、获取程序的Home目录

 

NSString *homeDirectory = NSHomeDirectory();
NSLog(@"path:%@", homeDirectory);

打印结果:

2012-06-17 14:00:06.098 IosSandbox[3536:f803] /Users/rongfzh/Library/Application Support/iPhone Simulator/5.1/Applications/3B8EC78A-5EEE-4C2F-B0CB-4C3F02B996D2

那在真机上的目录有是怎么样的呢？我们看看

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

 

2012-06-17 14:00:06.099 IosSandbox[3536:f803] path:/Users/rongfzh/Library/Application Support/iPhone Simulator/5.1/Applications/3B8EC78A-5EEE-4C2F-B0CB-4C3F02B996D2/Documents

3、获取Cache目录

 

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSString *path = [paths objectAtIndex:0];
NSLog(@"%@", path);

打印结果

2012-06-17 14:03:50.431 IosSandbox[3628:f803] /Users/rongfzh/Library/Application Support/iPhone Simulator/5.1/Applications/3B8EC78A-5EEE-4C2F-B0CB-4C3F02B996D2/Library/Caches

4、获取Library目录

 

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);
NSString *path = [paths objectAtIndex:0];
NSLog(@"%@", path);

打印结果

2012-06-17 14:07:17.544 IosSandbox[3733:f803] /Users/rongfzh/Library/Application Support/iPhone Simulator/5.1/Applications/3B8EC78A-5EEE-4C2F-B0CB-4C3F02B996D2/Library

5、获取Tmp目录

NSString *tmpDir = NSTemporaryDirectory();
 NSLog(@"%@", tmpDir);

打印结果

 

2012-06-17 14:08:07.824 IosSandbox[3782:f803] /var/folders/g7/246bh79130zblw0yjjtc55cw0000gn/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];

注：我们在真机上也运行一下，把文件写入，下一步从真机上把内容读取出来。

写入输入 array ,里面是两个字符串，一会我们读出来打印。

写入我们在程序沙盒目录下看到文件 testFile.txt

 

打开文件看到的内容是这样的,是个xml格式的plist文件，数据格式保存了内容。

 

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<array>
    <string>内容</string>
    <string>content</string>
</array>
</plist>

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);

打印结果：

把上面的文件解析后，把内容打印出来了。

 

2012-06-17 14:14:46.249 IosSandbox[3918:f803] (
    "U5185U5bb9",
    content
)

真机上读取并打印文件路径：

 

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

 (

 

    "U5185U5bb9",

    content

)

真机上也能写入和打印。