How to Determine a File's Length Using Golang's os.File.Stat()?

Determining File Length in Golang

While exploring the Golang documentation for os.File, the question arises whether there exists a straightforward method to ascertain a file's length. Contrary to initial assumptions, Golang provides an elegant mechanism to retrieve this information.

Solution: Utilize the os.File.Stat() Interface

The key to obtaining file length in Golang lies in utilizing the os.File.Stat() method. This method returns a os.FileInfo value, which encompasses a plethora of file metadata. Among these attributes is a crucial method known as Size().

Code Example

To demonstrate the practical implementation of this technique, consider the following code snippet:

package main

import (
    "fmt"
    "os"
)

func main() {
    f, err := os.Open("file.txt")
    if err != nil {
        // Could not open file, handle error
    }

    fi, err := f.Stat()
    if err != nil {
        // Could not obtain stat, handle error
    }

    fmt.Printf("The file is %d bytes long", fi.Size())
}

By invoking os.File.Stat(), we retrieve a os.FileInfo instance (fi). This instance holds the Size() method, which, when invoked, yields the length of the opened file in bytes.

Remember, when retrieving the file length, it's essential to capture any potential errors arising from file operations. These errors should be gracefully handled to ensure robust code execution.

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