我正在尝试查找文件大小.但我的长度等于零 [英] I'm trying to find a file size. But my length is equl to zero

问题描述

我正在尝试查找文件大小.

I'm trying to find a file size.

 NSFileHandle *output = [NSFileHandle fileHandleForWritingAtPath:self.finalPath]; 
//seek to begin of the file
[output seekToFileOffset:0];
NSData *mydata = [output availableData];
NSLog(@"length: %d", [mydata length]);

但我的长度等于零.为什么?

But my length is equl to zero. Why?

推荐答案

availableData 用于读取文件.如果您只想了解文件的大小，实际上不必打开它.只需像这样使用 NSFileManager :

availableData is for reading files. If you just want to find out the size of a file, you don't actually have to open it. Just use NSFileManager like this:

NSDictionary *attributes = [[NSFileManager defaultManager] attributesOfItemAtPath:self.finalPath error:NULL];
unsigned long long fileSize = [attributes fileSize]; // in bytes

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