How Can I Get the Total Size of a Windows Drive Using Go?

Determining the Total Size of a Drive in Windows Using Go

To retrieve the total size of a drive in Windows using Go, delve into the standard windows API call, specifically the GetDiskFreeSpaceExW() function from kernel32.dll. While this function was previously employed to obtain free space, it also provides access to the drive's total size.

Decoding the GetDiskFreeSpaceExW() Function

GetDiskFreeSpaceExW() has several parameters:

• An in-parameter specifying the drive's path
• Three out-parameters capturing the available free bytes, total bytes (drive size), and total free bytes

Implementing the Solution

In your Go code, you can implement this solution as follows:

package main

import (
    "fmt"
    "syscall"
    "unsafe"
)

func main() {
    kernelDLL, err := syscall.LoadDLL("kernel32.dll")
    if err != nil {
        fmt.Println("Failed to load kernel32.dll:", err)
        return
    }
    GetDiskFreeSpaceExW, err := kernelDLL.FindProc("GetDiskFreeSpaceExW")
    if err != nil {
        fmt.Println("Failed to find GetDiskFreeSpaceExW proc:", err)
        return
    }

    var free, total, avail int64

    path := "c:\"
    r1, r2, _ := GetDiskFreeSpaceExW.Call(
        uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr(path))),
        uintptr(unsafe.Pointer(&free)),
        uintptr(unsafe.Pointer(&total)),
        uintptr(unsafe.Pointer(&avail)),
    )

    fmt.Println("Free:", free, "Total:", total, "Available:", avail)

    if r1 == 1 && r2 == 0 {
        fmt.Println("Success.")
    } else {
        fmt.Println("Failed:", syscall.Errno(r1))
    }
}

This code will provide the desired output, displaying both the total and free space on the specified drive.

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