writeToFile在OSX中，追加到文件？ [英] writeToFile in OSX, appending to the file?

问题描述

我需要不时地写一些数据到一个文件，附加到它。

I need to write some data from time to time to a file, appending to it.

现在我有：

BOOL ok = [[NSString stringWithFormat:@"%f",raw] writeToFile:path atomically:YES encoding:NSUnicodeStringEncoding error:&error];

如何在文件末尾追加 raw

How could I append to the end of the file the new contents of raw?

推荐答案

一种方法是使用fileHandleForWritingAtPath：方法获取NSFileHandle，将NSString转换为NSData然后调用writeData：在你的NSFileHandle上移动文件指针到文件的结尾。

One method would be to obtain a NSFileHandle using fileHandleForWritingAtPath: method, converting your NSString to NSData and then calling writeData: on your NSFileHandle after moving the file pointer to the end of the file.

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