ios 文件管理 获取文件属性 读取文件

  

   

    

     

    
    

     

      1、文件的创建
     
    
   

    

     

    
    

     

      -(IBAction) CreateFile
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     

      //对于错误信息
     
    
   

    

     

    
    

     

      NSError *error;
     
    
   

    

     

    
    

     

      // 创建文件管理器
     
    
   

    

     

    
    

     

      NSFileManager *fileMgr = [NSFileManager defaultManager];
     
    
   

    

     

    
    

     

      //指向文件目录
     
    
   

    

     

    
    

     

      NSString *documentsDirectory= [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
     
    
   

    

     

    
    

     

      
//创建一个目录
     
    
   

    

     

    
    

     

      [[NSFileManager defaultManager]   createDirectoryAtPath: [NSString stringWithFormat:@"%@/myFolder", NSHomeDirectory()] attributes:nil];
     
    
   

    

     

    
    

     

      
// File we want to create in the documents directory我们想要创建的文件将会出现在文件目录中
     
    
   

    

     

    
    

     

      // Result is: /Documents/file1.txt结果为：/Documents/file1.txt
     
    
   

    

     

    
    

     

      NSString *filePath= [documentsDirectory
     
    
   

    

     

    
    

     

      stringByAppendingPathComponent:@"file2.txt"];
     
    
   

    

     

    
    

     

      //需要写入的字符串
     
    
   

    

     

    
    

     

      NSString *str= @"iPhoneDeveloper Tipsnhttp://iPhoneDevelopTips,com";
     
    
   

    

     

    
    

     

      //写入文件
     
    
   

    

     

    
    

     

      [str writeToFile:filePath atomically:YES encoding:NSUTF8StringEncoding error:&error];
     
    
   

    

     

    
    

     

      //显示文件目录的内容
     
    
   

    

     

    
    

     

      NSLog(@"Documentsdirectory: contentsOfDirectoryAtPath:documentsDirectory error:&error]);
     
    
   

    

     

    
    

     

      
}
     
    
   

    

     

    
    

     

       
     
    
   

    

     

    
    

     

      
     
    
   

    

     

    
    

     

       
     
    
   

    

     

    
    

     

      2、对文件重命名
     
    
   

    

     

    
    

     

       
     
    
   

    

     

    
    

     

      对一个文件重命名
     
    
   

    

     

    
    

     

      想要重命名一个文件，我们需要把文件移到一个新的路径下。下面的代码创建了我们所期望的目标文件的路径，然后请求移动文件以及在移动之后显示文件目录。
     
    
   

    

     

    
    

     

      //通过移动该文件对文件重命名
     
    
   

    

     

    
    

     

      NSString *filePath2= [documentsDirectory
     
    
   

    

     

    
    

     

      stringByAppendingPathComponent:@"file2.txt"];
     
    
   

    

     

    
    

     

      //判断是否移动
     
    
   

    

     

    
    

     

      if ([fileMgr moveItemAtPath:filePath toPath:filePath2 error:&error] != YES)
     
    
   

    

     

    
    

     

      NSLog(@"Unable to move file: %@", [error localizedDescription]);
     
    
   

    

     

    
    

     

      //显示文件目录的内容
     
    
   

    

     

    
    

     

      NSLog(@"Documentsdirectory: %@",
     
    
   

    

     

    
    

     

      [fileMgr contentsOfDirectoryAtPath:documentsDirectoryerror:&error]);
     
    
   

    

     

    
    

     

      
     
    
   

    

     

    
    

     

       
     
    
   

    

     

    
    

     

       
     
    
   

    

     

    
    

     

      3、删除一个文件
     
    
   

    

     

    
    

     

       
     
    
   

    

     

    
    

     

      
为了使这个技巧完整，让我们再一起看下如何删除一个文件：
//在filePath2中判断是否删除这个文件
if ([fileMgr removeItemAtPath:filePath2 error:&error] != YES)
NSLog(@"Unable to delete file: %@", [error localizedDescription]);
//显示文件目录的内容
NSLog(@"Documentsdirectory: %@",
[fileMgr contentsOfDirectoryAtPath:documentsDirectoryerror:&error]);
一旦文件被删除了，正如你所预料的那样，文件目录就会被自动清空：
     
    
   

    

     

    
    

     

      这些示例能教你的，仅仅只是文件处理上的一些皮毛。想要获得更全面、详细的讲解，你就需要掌握NSFileManager文件的知识。
     
    
   

    

     

    
    

     

      
     
    
   

    

     

    
    

     

       
     
    
   

    

     

    
    

     

       
     
    
   

    

     

    
    

     

      4、删除目录下所有文件
     
    
   

    

     

    
    

     

       
     
    
   

    

     

    
    

     

      //获取文件路径
- (NSString *)attchmentFolder{
     
    
   

    

     

    
    

     

      NSString *document = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
     
    
   

    

     

    
    

     

      NSString *path = [document stringByAppendingPathComponent:@"Attchments"];
     
    
   

    

     

    
    

     

      
NSFileManager *manager = [NSFileManager defaultManager];
     
    
   

    

     

    
    

     

      
if(![manager contentsOfDirectoryAtPath:path error:nil]){
     
    
   

    

     

    
    

     

      [manager createDirectoryAtPath:path withIntermediateDirectories:NO attributes:nil error:nil];
     
    
   

    

     

    
    

     

      }
     
    
   

    

     

    
    

     

      
return path;
     
    
   

    

     

    
    

     

      }
     
    
   

    

     

    
    

     

       
     
    
   

    

     

    
    

     

      --清除附件
BOOL result = [[NSFileManager defaultManager] removeItemAtPath:[[MOPAppDelegate instance] attchmentFolder] error:nil];
     
    
   

    

     

    
    

     

      

     
    
   

    

     

    
    

     

      
     
    
   

    

     

    
    

     

      5、获得文件的属性
-(void)getFileAttributes
{
NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *path = @"/1ct.rtf";
NSDictionary *fileAttributes = [fileManager fileAttributesAtPath:path traverseLink:YES];
 NSLog(@"@@");
if (fileAttributes != nil) {
 NSNumber *fileSize;
 NSString *fileOwner, *creationDate;
 NSDate *fileModDate;
 //NSString *NSFileCreationDate
     
    
   

    

     

    
    

     

       //文件大小
 if (fileSize = [fileAttributes objectForKey:NSFileSize]) {
 NSLog(@"File size: %qin", [fileSize unsignedLongLongValue]);
 }
     
    
   

    

     

    
    

     

       //文件创建日期
 if (creationDate = [fileAttributes objectForKey:NSFileCreationDate]) {
 NSLog(@"File creationDate: %@n", creationDate);
 //textField.text=NSFileCreationDate;
 }
     
    
   

    

     

    
    

     

       //文件所有者
 if (fileOwner = [fileAttributes objectForKey:NSFileOwnerAccountName]) {
 NSLog(@"Owner: %@n", fileOwner);
 }
     
    
   

    

     

    
    

     

       //文件修改日期
 if (fileModDate = [fileAttributes objectForKey:NSFileModificationDate]) {
 NSLog(@"Modification date: %@n", fileModDate);
 }
 }
else {
 NSLog(@"Path (%@) is invalid.", path);
 }
}
     
    
   

    

     

    
    

     

       
     
    
   

    

     

    
    

     

       
     
    
   

    

     

    
    

     

       
     
    
   

    

     

    
    

     

       
     
    
   

    

     

    
    

     

      //日期格式化
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
     
    
   

    

     

    
    

     

      [dateFormatter setDateStyle:NSDateFormatterMediumStyle];
     
    
   

    

     

    
    

     

      [dateFormatter setTimeStyle:NSDateFormatterNoStyle];
     
    
   

    

     

    
    

     

      
//数字格式化
     
    
   

    

     

    
    

     

      NSNumberFormatter *numberFormatter =[[NSNumberFormatter alloc] init];
     
    
   

    

     

    
    

     

      [numberFormatter setPositiveFormat: @"#,##0.## bytes"];
     
    
   

    

     

    
    

     

      
     
    
   

    

     

    
    

     

      //获取文件属性
     
    
   

    

     

    
    

     

      NSDictionary *fileAttributes =[[NSFileManager defaultManager] fileAttributesAtPath: directoryPath traverseLink: YES];
     
    
   

    

     

    
    

     

      
     
    
   

    

     

    
    

     

      //获取文件的创建日期
     
    
   

    

     

    
    

     

      NSDate *modificationDate = (NSDate*)[fileAttributes objectForKey: NSFileModificationDate];
     
    
   

    

     

    
    

     

      
     
    
   

    

     

    
    

     

      //获取文件的字节大小
     
    
   

    

     

    
    

     

      NSNumber *fileSize = (NSNumber*)[fileAttributes objectForKey: NSFileSize];
     
    
   

    

     

    
    

     

      
//格式化文件大小
nsstring A = [numberFormatter stringFromNumber: fileSize];
     
    
   

    

     

    
    

     

      
     
    
   

    

     

    
    

     

      //格式化文件创建日期
     
    
   

    

     

    
    

     

      NSstring B =[dateFormatter stringFromDate: modificationDate];
     
    
   

    

     

    
    

     

       
     
    
   

    

     

    
    

     

      
[numberFormatter release];
     
    
   

    

     

    
    

     

      [dateFormatter release];
     
    
   

    

     

    
    

     

       
     
    
   

    

     

    
    

     

      
     
    
   

    

     

    
    

     

      
     
    
   

    

     

    
    

     

      6、读取文件内容操作
     
    
   

    

     

    
    

     

      - (void) loadFileContentsIntoTextView
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     

      //通过流打开一个文件
     
    
   

    

     

    
    

     

       
     
    
   

    

     

    
    

     

      NSInputStream *inputStream = [[NSInputStream alloc] initWithFileAtPath: filePath];
     
    
   

    

     

    
    

     

       
     
    
   

    

     

    
    

     

      [inputStream open];
     
    
   

    

     

    
    

     

       
     
    
   

    

     

    
    

     

      
NSInteger maxLength = 128;
     
    
   

    

     

    
    

     

      uint8_t readBuffer [maxLength];
     
    
   

    

     

    
    

     

      //是否已经到结尾标识
     
    
   

    

     

    
    

     

      BOOL endOfStreamReached = NO;
     
    
   

    

     

    
    

     

      // NOTE: this tight loop will block until stream ends
     
    
   

    

     

    
    

     

      while (! endOfStreamReached)
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     

      NSInteger bytesRead = [inputStream read: readBuffer maxLength:maxLength];
     
    
   

    

     

    
    

     

      if (bytesRead == 0)
     
    
   

    

     

    
    

     

      {//文件读取到最后
     
    
   

    

     

    
    

     

      endOfStreamReached = YES;
     
    
   

    

     

    
    

     

      }
     
    
   

    

     

    
    

     

      else if (bytesRead == -1)
     
    
   

    

     

    
    

     

      {//文件读取错误
     
    
   

    

     

    
    

     

      endOfStreamReached = YES;
     
    
   

    

     

    
    

     

      }
     
    
   

    

     

    
    

     

      else
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     

      NSString *readBufferString =[[NSString alloc] initWithBytesNoCopy: readBuffer length: bytesRead encoding: NSUTF8StringEncoding freeWhenDone: NO]; 
     
    
   

    

     

    
    

     

      //将字符不段的加载到视图
     
    
   

    

     

    
    

     

      [self appendTextToView: readBufferString];
     
    
   

    

     

    
    

     

      [readBufferString release];
     
    
   

    

     

    
    

     

      }
     
    
   

    

     

    
    

     

      }
     
    
   

    

     

    
    

     

      [inputStream close];
     
    
   

    

     

    
    

     

      [inputStream release];
     
    
   

    

     

    
    

     

      }
     
    
  
 

  
 
 

文章来源: zzzili.blog.csdn.net，作者：清雨小竹，版权归原作者所有，如需转载，请联系作者。

原文链接：zzzili.blog.csdn.net/article/details/8265595