iPhone - 设备上剩余的可用空间报告不正确（+- 200 Mb 差异）

发布于 2025-01-05 01:21:57 字数 730 浏览 5 评论 0原文

我使用这种方法来获取磁盘上的可用空间，这是从经过一些研究后发现的代码中提取的。

    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];  
    }

我想知道为什么运行这个时，它给了我 3660062720.000000 字节的可用空间这将给出 3,408699035644531 Gb (/1024/1024/1024)

但查看我的 iPhone 设置 ->一般信息（以及 iTunes），据说我的 iPhone 只剩下 3.2 GB。

错误在哪里？

原文

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 ?

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倾｀听者〃 2025-01-12 01:21:58

有时，可用空间的报告似乎不正确 https://discussions.apple.com/thread /2566412?threadID=2566412

编辑：我尝试了以下代码并注意到在我的设备上，还有一个 ~200MB 差异。也许该存储空间是以某种方式为系统保留的？

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

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

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

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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