How do you determine a file's current position in Go?

Finding File Positions in Go

In the world of file handling, determining a file's current position is often crucial. In C programming, the fgetpos function is commonly employed to retrieve this information. However, Go programmers may encounter difficulties finding an analogous method in the io package.

Seeking the Absolute Position

Go does not provide a direct equivalent to fgetpos. However, one can obtain the current position by performing a Seek operation:

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

This code seeks 0 bytes from the current position, essentially returning the absolute position as the result stored in the offset variable. It is important to note that subsequent Seek or Read operations will alter the file's position, so the position retrieved by this method should be considered transient.

By incorporating this technique into your Go programs, you can effectively determine the current position of a file, facilitating seamless file handling operations.

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