英文:
How to get last-accessed date and time of file in Go?
问题
有人知道如何检查文件的访问日期和时间吗？该函数返回修改的日期和时间，我需要一个能够将访问的日期时间与当前日期和时间进行比较的东西。
英文:
Does anyone know how to check for a file access date and time? The function returns the modified date and time and I need something that compares the accessed date time to the current date and time.
答案1
得分: 19
你可以使用os.Stat来获取一个包含最后访问时间的FileInfo结构体（同时也包含最后修改和最后状态更改时间）。
info, err := os.Stat("example.txt")
if err != nil {
// TODO: 处理错误（例如文件未找到）
}
// info.Atime_ns 现在包含最后访问时间
// （以纳秒为单位，自Unix纪元以来）
之后，你可以使用time.Nanoseconds来获取当前时间（也是自Unix纪元以来的纳秒数，即1970年1月1日00:00:00 UTC）。要获取纳秒级的持续时间，只需将这两个值相减：
duration := time.Nanoseconds() - info.Atime_ns
英文:
You can use os.Stat to get a FileInfo struct which also contains the last access time (as well as the last modified and the last status change time).
info, err := os.Stat("example.txt")
if err != nil {
// TODO: handle errors (e.g. file not found)
}
// info.Atime_ns now contains the last access time
// (in nanoseconds since the unix epoch)
After that, you can use time.Nanoseconds to get the current time (also in nanoseconds since the unix epoch, January 1, 1970 00:00:00 UTC). To get the duration in nanoseconds, just subtract those two values:
duration := time.Nanoseconds() - info.Atime_ns
答案2
得分: 9
通过将os.FileInfo转换为*syscall.Stat_t：
package main
import (
"fmt"
"log"
"os"
"syscall"
"time"
)
func main() {
for _, arg := range os.Args[1:] {
fileinfo, err := os.Stat(arg)
if err != nil {
log.Fatal(err)
}
atime := fileinfo.Sys().(*syscall.Stat_t).Atim
fmt.Println(time.Unix(atime.Sec, atime.Nsec))
}
}
英文:
By casting os.FileInfo to *syscall.Stat_t:
package main
import ( "fmt"; "log"; "os"; "syscall"; "time" )
func main() {
for _, arg := range os.Args[1:] {
fileinfo, err := os.Stat(arg)
if err != nil {
log.Fatal(err)
}
atime := fileinfo.Sys().(*syscall.Stat_t).Atim
fmt.Println(time.Unix(atime.Sec, atime.Nsec))
}
}
答案3
得分: 6
另外，在 Stat 后，你也可以执行以下操作：
statinfo.ModTime()
如果需要，你还可以对其使用 Format()，例如用于 web 服务器
参见 https://gist.github.com/alexisrobert/982674
英文:
Alternatively, after the Stat you can also do
statinfo.ModTime()
Also you can use Format() on it, should you need it eg for a webserver
答案4
得分: 0
For windows
syscall.Win32FileAttributeData
info, _ := os.Stat("test.txt")
fileTime := info.Sys().(*syscall.Win32FileAttributeData).LastAccessTime
aTime := time.Unix(0, fileTime.Nanoseconds())
Example
package main
import (
"fmt"
"log"
"os"
"syscall"
"time"
)
func main() {
info, _ := os.Stat("./test.txt")
fileTime := info.Sys().(*syscall.Win32FileAttributeData).LastAccessTime
// _ = info.Sys().(*syscall.Win32FileAttributeData).CreationTime
// _ = info.Sys().(*syscall.Win32FileAttributeData).LastWriteTime
fileAccessTime := time.Unix(0, fileTime.Nanoseconds())
// Compare
// t2, _ := time.Parse("2006/01/02 15:04:05 -07:00:00", "2023/02/08 13:18:00 +08:00:00")
now := time.Now()
log.Println(fileAccessTime)
log.Println(now.Add(-20 * time.Minute))
if fileAccessTime.After(now.Add(-20 * time.Minute)) {
fmt.Println("You accessed this file 20 minutes ago.")
}
}
Linux
see this answer
英文:
For windows
syscall.Win32FileAttributeData
info, _ := os.Stat("test.txt")
fileTime := info.Sys().(*syscall.Win32FileAttributeData).LastAccessTime
aTime := time.Unix(0, fileTime.Nanoseconds())
Example
package main
import (
"fmt"
"log"
"os"
"syscall"
"time"
)
func main() {
info, _ := os.Stat("./test.txt")
fileTime := info.Sys().(*syscall.Win32FileAttributeData).LastAccessTime
// _ = info.Sys().(*syscall.Win32FileAttributeData).CreationTime
// _ = info.Sys().(*syscall.Win32FileAttributeData).LastWriteTime
fileAccessTime := time.Unix(0, fileTime.Nanoseconds())
// Compare
// t2, _ := time.Parse("2006/01/02 15:04:05 -07:00:00", "2023/02/08 13:18:00 +08:00:00")
now := time.Now()
log.Println(fileAccessTime)
log.Println(now.Add(-20 * time.Minute))
if fileAccessTime.After(now.Add(-20 * time.Minute)) {
fmt.Println("You accessed this file 20 minutes ago.")
}
}
Linux
see this answer
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论