文件管理

NSFileManager * fileManager = [NSFileManager defaultManager];
NSString * path = @"/Users/frankhou/Desktop/5195C73719227F8E93D17E77EE24746B.jpg";
NSError * error;
NSDictionary * dic = [fileManager attributesOfItemAtPath:path error:&error];

NSLog(@"dic %@",dic);

if (error == nil)
{
NSDate * date = [dic objectForKey:NSFileCreationDate];
NSString * size = [dic objectForKey:NSFileSize];
NSLog(@" date = %@, size = %@",date,size);
}

//1.
NSFileManager * fileManager = [NSFileManager defaultManager];
NSString * path = @"/Users/Qinggong/Desktop/装机";
NSError * error;

//只能取得目录下,第一级目录
NSArray * array = [fileManager contentsOfDirectoryAtPath:path error:&error];
NSLog(@"array %@",array);

//2
NSFileManager * fileManager = [NSFileManager defaultManager];
NSString * path = @"/Users/aplle/Desktop/other";
NSError * error;
//能够逐级的获得所有子集的目录
NSArray * array = [fileManager subpathsOfDirectoryAtPath:path error:&error];
NSLog(@"array %@",array);

/*
//1创建目录
NSFileManager * fileManager = [NSFileManager defaultManager];
NSString * path = @"/Users/Qinggong/Desktop/myfolder/aaa";
NSError * error;

//withIntermediateDirectories YES 逐级创建文件夹,NO表示只能够创建一级目录

BOOL isCreateSuccess = [fileManager createDirectoryAtPath:path withIntermediateDirectories:YES attributes:nil error:&error];
if (isCreateSuccess)
{
NSLog(@"创建成功");
}
else
{
NSLog(@"error %@",error);
}
*/

//2 移动目录 移动就是剪切操作
/*
NSFileManager * fileManager = [NSFileManager defaultManager];
NSString * path = @"/Users/aplle/Desktop/myfolder";
NSString * pathTo = @"/Users/Qinggong/Desktop/newmyfolder";
NSError * error ;
BOOL isMoveSuccess = [fileManager moveItemAtPath:path toPath:pathTo error:&error];
if (isMoveSuccess)
{
NSLog(@"移动成功");
}
else
{
NSLog(@"error %@",error);
}
*/

//3.删除
/*
NSFileManager * fileManager = [NSFileManager defaultManager];
NSString * path = @"/Users/Qinggong/Desktop/newmyfolder";
NSError * error;
BOOL isRemoveSuccess = [fileManager removeItemAtPath:path error:&error];
if (isRemoveSuccess)
{
NSLog(@"删除成功");
}
else
{
NSLog(@"erro %@",error);
}
*/

//4.拷贝文件
NSFileManager * fileManager = [NSFileManager defaultManager];
NSString * path = @"/Users/Qinggong/Desktop/myfolder";
NSString * pathTo = @"/Users/Qinggong/Desktop/newmyfolder";
NSError * error;
BOOL isCopySuccess = [fileManager copyItemAtPath:path toPath:pathTo error:&error];
if(isCopySuccess)
{
NSLog(@"拷贝成功");
}
else
{
NSLog(@"error %@",error);
}

//1.获得文件
//mp3.mp4 rmvb mkv pdf doc txt
/*
NSString * path = @"/Users/Qinggong/Desktop/屏幕快照.png";
NSData * data = [NSData dataWithContentsOfFile:path];
NSLog(@"%ld",data.length);

NSFileManager * fileManager = [NSFileManager defaultManager];
NSString * pathTo = @"/Users/Qinggong/Desktop/屏幕快照副本.png";

BOOL isCreateSuccess =  [fileManager createFileAtPath:pathTo contents:data attributes:nil];

if (isCreateSuccess)
{
NSLog(@"创建成功");
}
else
{
NSLog(@"创建失败");
}
*/
//音频文件,文本文件,视频文件就必须使用NSData数据类
/*
NSString * str = @"www.baidu.cn";
NSError * error;
[str writeToFile:@"/Users/Qinggong/Desktop/text.txt" atomically:YES encoding:NSUTF8StringEncoding error:&error];
*/
/*
NSString * path = @"/Users/Qinggong/Desktop/text.txt";
//把目标文件加载到内存中.
//NSData 是不可变长度的Data类型,只能够通过一次加载完成所有的数据
NSData * data = [NSData dataWithContentsOfFile:path];

NSLog(@"data length %ld",data.length);
NSString * pathTo = @"/Users/Qinggong/Desktop/nextext.txt";
//把加载到内存中的文件,写入到指定的位置
BOOL isWriteSuccess = [data writeToFile:pathTo atomically:YES];

if (isWriteSuccess)
{
NSLog(@"写入成功");
}
else
{
NSLog(@"写入失败");
}
*/

//当需要把多个NSData数据拼接成一个数据存储的时候,就要想到使用NSMutableData这个类型
NSString * str1 = @"好好学习";
NSString * str2 = @"天天向上";
NSString * str3 = @"今天休息";

NSMutableData * muData = [[NSMutableData alloc] init];

NSData * d1 = [str1 dataUsingEncoding:NSUTF8StringEncoding];
NSData * d2 = [str2 dataUsingEncoding:NSUTF8StringEncoding];
NSData * d3 = [str3 dataUsingEncoding:NSUTF8StringEncoding];

//appendData 能够把nsdata对象加入到 muData对象中
[muData appendData:d1];
[muData appendData:d2];
[muData appendData:d3];

NSString * path = @"/Users/Qinggong/Desktop/ttttt.txt";
//NSMutableData是继承至NSData的所以可以调用writeToFile 把数据写入到一个指定的目录下
BOOL iswriteSucess = [muData writeToFile:path atomically:YES];
if (iswriteSucess)
{
NSLog(@"创建成功");
}
else
{
NSLog(@"创建失败");
}