How Can I Retrieve the File Position in Go?

Retrieving File Position in Go: An Alternative to fgetpos

In C or C , developers often utilize the fgetpos() function to ascertain a file's position within a stream. While Go's standard library doesn't explicitly offer a dedicated fgetpos counterpart, an alternative method exists for retrieving the file position.

Solution:

The File.Seek() function provides a convenient solution. By seeking to a position of 0 bytes relative to the current position, you can obtain the resulting position, which represents the file's absolute offset.

import (
    "io"
    "os"
)

func main() {
    f, err := os.Open("file.txt")
    if err != nil {
        // handle error
    }

    offset, err := f.Seek(0, io.SeekCurrent)
    if err != nil {
        // handle error
    }

    // offset now contains the absolute file position
}

This approach essentially emulates the behavior of fgetpos by seeking to the current position while also returning the resulting position. It allows you to determine the absolute offset of the file, which can be useful in various scenarios.

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