Append data to the sandbox path instead of overwriting the previous data.

Append data to the sandbox path instead of overwriting the previous data.

The Spring Festival is approaching. This is a busy time, and there is no time to write a blog for various projects.

/**

* @ Brief append the written data to the sandbox path

*

* @ Param string the string to be written

* @ Param fileName write data to the file name

*/

+ (Void) writefile :( NSString *) string fileName :( NSString *) fileName

{

NSLog (@ "fileName = % @", fileName );

NSArray * paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES );

NSString * homePath = [paths objectAtIndex: 0];

NSString * filePath = [homePath stringByAppendingPathComponent: fileName];

NSFileManager * fileManager = [NSFileManagerdefaultManager];

If (! [FileManager fileExistsAtPath: filePath]) // if it does not exist

{

NSLog (@ "------- the file does not exist, write the file ----------");

NSError * error;

If ([string writeToFile: filePath atomically: YESencoding: NSUTF8StringEncodingerror: & error])

{

NSLog (@ "------ writing files ------ success ");

}

Else

{

NSLog (@ "------ Write File ------ fail, error =%@", error );

}

}

Else // append the data to the file instead of overwriting the original file.

{

NSLog (@ "------- file exists, append file ----------");

NSFileHandle * fileHandle = [NSFileHandle fileHandleForUpdatingAtPath: filePath];

[FileHandle seekToEndOfFile]; // jump the node to the end of the file

NSData * stringData = [string dataUsingEncoding: NSUTF8StringEncoding];

[FileHandle writeData: stringData]; // append the data

[FileHandle closeFile];

}

}