IOS. OC.01 NSFileManager-file management, nsfilemanager

IOS. OC.01 NSFileManager-file management, nsfilemanager

// Create a file

// Convert the string file into NSData before it can be written to the file

NSFileManager * manager = [NSFileManager defaultManager]; // create an object

NSString * homePath = NSHomeDirectory (); // shahe directory

NSString * path = [homePath stringByAppendingString: @ "file. text"]; // file storage path

NSString * text = @ "OMG"; // content written to the file

NSData * data = [text dataUsingEncoding: NSUTF8StringEncoding]; // converts a string to NSData

BOOL success = [manager createFileAtPath: path contents: data attributes: nil]; // write a file

// Read the file

NSFileManager * fileManager = [NSFileManager defaultManager];

NSData * fileData = [fileManager contentsAtPath: path]; // Read File Content Based on path

NSString * fileString = [[NSString alloc] initWithData: fileData encoding: NSUTF8StringEncoding]; // convert NSData to NSString

// Get the file size

NSFileManager * fm = [NSFileManager defamanager manager];

NSDictionary * arttriDic = [fm attributesOfItemAtPath: path error: nil]; // get the attribute Dictionary of the file

NSNumber * fileSize = [arttriDic objectForKey: NSFileSize]; // get the file size

 

 

// Write and read files

// NSArray, NSString, NSData, and NSDictionary all contain data. They all have a writeToFile method to write data to a file, and both have a method to read the file.

// Write

NSArray * array = @ [@ "Zhang San", @ "Li Si"];

NSString * path = [NSHomeDirectory () stringByAppendingString: @ "text"];

[Array writeToFile: path atomically: YES];

// Read

NSArray * arr = [[NSArray alloc] initWithContentsOfFile: path]; // alloc

NSArray * arr2 = [NSArray arrayWithContentsOfFile: path]; // Class Method

 

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