How Do I Determine the Length of a File in Go?

Determining File Length in Go

Go programmers looking to obtain the length of a file may be initially puzzled, as the standard library's os.File type doesn't include a dedicated method for this purpose.

Solution: Utilize Stat() and Size()

The solution lies in the Stat() method of the os.File type. This method returns an os.FileInfo value, which provides access to a variety of file attributes, including its size through the Size() method.

For instance, consider the following code snippet:

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

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

In this code, f represents an open file. Calling Stat() on f retrieves the corresponding os.FileInfo struct, denoted by fi. The Size() method of fi can then be invoked to acquire the file length, which is returned as an integer (number of bytes).

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