查找文件大小 [英] Finding file's size

问题描述

在我的iPhone应用程序，我使用下面的代码来查找文件的大小。即使文件存在，我看到零的大小。谁能帮助我？先感谢。

In my iPhone app I am using the following code to find a file's size. Even though the file exists, I am seeing zero for the size. Can anyone help me? Thanks in advance.

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *URL = [documentsDirectory stringByAppendingPathComponent:@"XML/Extras/Approval.xml"];

NSLog(@"URL:%@",URL);
NSError *attributesError = nil;
NSDictionary *fileAttributes = [[NSFileManager defaultManager] attributesOfItemAtPath:URL error:&attributesError];

int fileSize = [fileAttributes fileSize];

推荐答案

尝试此操作;

NSDictionary *fileAttributes = [[NSFileManager defaultManager] attributesOfItemAtPath:URL error:&attributesError];

NSNumber *fileSizeNumber = [fileAttributes objectForKey:NSFileSize];
long long fileSize = [fileSizeNumber longLongValue];

请注意，fileSize不一定适合整数肯定会下降到一个很长的iOS，因为你永远不会超过现实。该示例使用long long，因为在我的代码中，我必须与具有更大存储空间的系统兼容。

Note that the fileSize won't necessarily fit in an integer (especially a signed one) although you could certainly drop to a long for iOS as you'll never exceed that in reality. The example uses long long as in my code I have to be compatible with systems with much larger storage available.

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