NSFileHandle

1.NSFileManager类主要对于文件的操作(删除，修改，移动，赋值等等)

//判断是否有 tagetPath 文件路径，没有就创建    NSFileManager *fileManage = [NSFileManager defaultManager];    BOOL success = [fileManage createFileAtPath:tagetPath contents:nil attributes:nil];    if (success) {    NSLog(@"create success");    }

2.NSFileHandle类主要对文件的内容进行读取和写入操作

①NSFileHandle处理文件的步骤

1:创建一个NSFileHandle对象

//创建流    NSFileHandle *inFileHandle = [NSFileHandle fileHandleForReadingAtPath:srcPath];    NSFileHandle *outFileHandle = [NSFileHandle fileHandleForWritingAtPath:tagetPath];

2:对打开的文件进行I/O操作

//获取文件路径    NSString *homePath = NSHomeDirectory();    NSString *filePath = [homePath stringByAppendingPathComponent:@"phone/Date.text"];    NSFileHandle *fileHandle = [NSFileHandle fileHandleForUpdatingAtPath:filePath];　//定位到最后 　[fileHandle seekToEndOfFile]; 　//定位到某个位置，100字节之后    [fileHandle seekToFileOffset:100];   //追加的数据    NSString *str = @"add world";    NSData *stringData = [str dataUsingEncoding:NSUTF8StringEncoding];    //追加写入数据    [fileHandle writeData:stringData];

3:关闭文件对象操作

　　//关闭流    [fileHandle closeFile];

常用处理方法，读

//读取文件内容void readByFile(){    //文件路径    NSString *homePath = NSHomeDirectory();    NSString *filePath = [homePath stringByAppendingPathComponent:@"phone/cellPhone.text"];    NSFileHandle *fileHandle = [NSFileHandle fileHandleForReadingAtPath:filePath];    NSInteger length = [fileHandle availableData].length;    //跳转到指定位置    [fileHandle seekToFileOffset:length/2];    NSData *data = [fileHandle readDataToEndOfFile];    NSString *str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];    NSLog(@"%@",str);    [fileHandle closeFile];}

复制文件

void copy2Other(){    NSString *homePath = NSHomeDirectory();    NSString *filePath = [homePath stringByAppendingPathComponent:@"phone/cellPhone.text"];    NSString *tagetPath = [homePath stringByAppendingPathComponent:@"phone/cellPhone_bak.text"];    //是否有这个文件，没有则创建    NSFileManager *fileManage =[NSFileManager defaultManager];    BOOL success = [fileManage createFileAtPath:tagetPath contents:nil attributes:nil];    if (success) {        NSLog(@"create success");    }    //通过 NSFileHandle 读取源文件,写入另一文件中    NSFileHandle *outFileHandle = [NSFileHandle fileHandleForWritingAtPath:tagetPath];    NSFileHandle *inFileHandle = [NSFileHandle fileHandleForReadingAtPath:filePath];    NSData *data = [inFileHandle readDataToEndOfFile];    [outFileHandle writeData:data];    //关闭流    [inFileHandle closeFile];    [outFileHandle closeFile];}