iOS file processing

IOS file processing

Brief introduction

File processing cannot be interpreted intuitively through the application, and we can learn about IOS file processing from the following examples.

Operations on files in IOS. Because the app is in a sandbox, there are restrictions on file read and write permissions, and you can only read and write files in several directories.

The method used in file processing

Below is a list of methods for accessing and operating files.

The following examples you must replace the FilePath1, FilePath, and FilePath strings with the full file path to get the action you need.

Check if the file exists

   NSFileManager *fileManager = [NSFileManager defaultManager];
   //Get documents directory
   NSArray *directoryPaths = NSSearchPathForDirectoriesInDomains
   (NSDocumentDirectory, NSUserDomainMask, YES);
   NSString *documentsDirectoryPath = [directoryPaths objectAtIndex:0];
   if ([fileManager fileExistsAtPath:@""]==YES) {
        NSLog(@"File exists");
    }    

Compare the contents of the two files

   if ([fileManager contentsEqualAtPath:@"FilePath1" andPath:@" FilePath2"]) {
      NSLog(@"Same content");
   }

Check for writeable, readable, and executable files

  if ([fileManager isWritableFileAtPath:@"FilePath"]) {
      NSLog(@"isWritable");
   }
   if ([fileManager isReadableFileAtPath:@"FilePath"]) {
      NSLog(@"isReadable");
   }
   if ( [fileManager isExecutableFileAtPath:@"FilePath"]){
      NSLog(@"is Executable");
   }

Move the file

   if([fileManager moveItemAtPath:@"FilePath1" 
   toPath:@"FilePath2" error:NULL]){
      NSLog(@"Moved successfully");
   }

Copy the file

   if ([fileManager copyItemAtPath:@"FilePath1" 
   toPath:@"FilePath2"  error:NULL]) {
      NSLog(@"Copied successfully");
   }

Delete the file

 if ([fileManager removeItemAtPath:@"FilePath" error:NULL]) {
      NSLog(@"Removed successfully");
   }
 

Read the file

 NSData *data = [fileManager contentsAtPath:@"Path"];
 

Write to the file

  [fileManager createFileAtPath:@"" contents:data attributes:nil];