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] (
- "\U5185\U5bb9",
- 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
(
"\U5185\U5bb9",
content
)
真机上也能写入和打印。
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