iPhone - 设备上剩余的空间不正确（+ - 200 Mb差异） [英] iPhone - Free space left on device reported incorrectly (+- 200 Mb difference)

问题描述

  float我用这个方法得到磁盘上的空闲空间，从一些研究中找到的代码中提取出来。 freeSpace = -1.0f; 
 NSError * error = nil; 
 NSArray * paths = NSSearchPathForDirectoriesInDomains（NSDocumentDirectory，NSUserDomainMask，YES）; 
 NSDictionary * dictionary = [[NSFileManager defaultManager] attributesOfFileSystemForPath：[paths lastObject] error：& error]; 
 
 if（dictionary）{
 NSNumber * fileSystemSizeInBytes = [dictionary objectForKey：NSFileSystemFreeSize]; 
 freeSpace = [fileSystemSizeInBytes floatValue]; 
 
 
 
 
 
 $ b 
我想知道为什么在运行时会给我一个3660062720.000000字节的可用空间
，会给3,408699035644531 Gb（/ 1024/1024/1024）
 
 
但看着我的iPhone设置 - >一般信息（也进入iTunes） ，我说我的iPhone只剩下3.2GB。
 
 
 
错误在哪里？ 
 
解决方案
似乎有时可用空间报告不正确 https： //discussions.apple.com/thread/2566412?threadID=2566412  
 
 
 
编辑：我尝试了下面的代码，注意到在我的设备上，也有〜200MB的差异。也许这个存储是为系统预留的？
 
 pre $  NSDictionary * fsAttr = [[NSFileManager defaultManager] fileSystemAttributesAtPath：NSHomeDirectory（）]; 
 
 unsigned long long freeSpace = [[fsAttr objectForKey：NSFileSystemFreeSize] unsignedLongLongValue]; 
 
 NSLog（@％llu，freeSpace）; 
 NSLog（@％f，freeSpace / 1073741824.0）; 
  




I use this method to get the free space on the disk, extracted from a code found after some researches.

    float freeSpace = -1.0f;  
    NSError* error = nil;  
    NSArray* paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);  
    NSDictionary* dictionary = [[NSFileManager defaultManager] attributesOfFileSystemForPath:[paths lastObject] error: &error];  

    if (dictionary) {  
        NSNumber* fileSystemSizeInBytes = [dictionary objectForKey:NSFileSystemFreeSize];  
        freeSpace = [fileSystemSizeInBytes floatValue];  
    }

I wonder why when runing this, it gives me a free space of 3660062720.000000 bytes that would give 3,408699035644531 Gb (/1024/1024/1024)

But looking into my iPhone setting -> general info (and also into iTunes), I'm said that my iPhone has only 3.2 Gb left.

Where is the mistake ?

解决方案

It appears that sometimes the free space is reported incorrectly https://discussions.apple.com/thread/2566412?threadID=2566412

EDIT: I tried the following code and noticed that on my device, there was also a ~200MB discrepancy. Maybe that storage is reserved for the system somehow?

NSDictionary *fsAttr = [[NSFileManager defaultManager] fileSystemAttributesAtPath:NSHomeDirectory()];

unsigned long long freeSpace = [[fsAttr objectForKey:NSFileSystemFreeSize] unsignedLongLongValue];

NSLog(@"%llu", freeSpace);
NSLog(@"%f", freeSpace / 1073741824.0); 

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