IOS學習之IOS沙盒(sandbox)機制和文件操作(二)

我們看看如何獲取應用程序沙盒目錄。包括真機的沙盒的目錄。

1、獲取程序的Home目錄

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

打印結果:

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

那在真機上的目錄有是怎麼樣的呢？我們看看

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

可見，真機上的目錄是/var/mobile/Applications/這個目錄下的，和模擬器不一樣。這個是Home目錄，其他的子目錄和模擬器一樣。

2、獲取document目錄

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

打印結果

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、獲取Cache目錄

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

打印結果:

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、獲取Library目錄

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

打印結果:

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、獲取Tmp目錄

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

打印結果:

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

6、寫入文件

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *docDir = [paths objectAtIndex:0];
    if (!docDir) {
        NSLog(@"Documents 目錄未找到");        
    }
    NSArray *array = [[NSArray alloc] initWithObjects:@"內容",@"content",nil];
    NSString *filePath = [docDir stringByAppendingPathComponent:@"testFile.txt"];
    [array writeToFile:filePath atomically:YES];

注：我們在真機上也運行一下，把文件寫入，下一步從真機上把內容讀取出來。

寫入輸入 array ,裏面是兩個字符串，一會我們讀出來打印。

寫入我們在程序沙盒目錄下看到文件 testFile.txt

打開文件看到的內容是這樣的,是個xml格式的plist文件，數據格式保存了內容。

<?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>內容</string>
	<string>content</string>
</array>
</plist> 

7、讀取文件

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);

打印結果：

把上面的文件解析後，把內容打印出來了。

2012-06-17 14:14:46.249 IosSandbox[3918:f803] (
    "\U5185\U5bb9",
    content
) 

真機上讀取並打印文件路徑：

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

(

"\U5185\U5bb9",

content

)

真機上也能寫入和打印。