iOS about file operations get file size

 Category: Apple IPhone2012-06-28 11:31 4664 people read reviews (0) favorite reports iOS Language Manager Test C

C Language Implementation

#include "Sys/stat.h"

-(Long Long) Filesizeatpath: (nsstring*) filepath{

struct STAT st;
if (Lstat ([FilePath cstringusingencoding:nsutf8stringencoding], &st) = = 0) {
return st.st_size;
}
return 0;
}

Objective-c Language Implementation

-(Long Long) Filesizeatpath: (nsstring*) filepath{

nsfilemanager* manager = [Nsfilemanager Defaultmanager];

if ([manager Fileexistsatpath:filepath]) {

return [[Manager Attributesofitematpath:filepath Error:nil] fileSize];

}

return 0;

}

If we loop the two methods 1000 times, we can find a huge performance gap between them, in my test environment, the results are as follows, the C function is only 5% of the OC method, in this recommendation C language

An empty folder which gets the size of 68k, should be the system file bar, if you know people, welcome message

iOS about file operations get file size