How to Access All Windows Drives Programmatically in Go?

Accessing All Windows Drives in Go

In Go, retrieving a comprehensive listing of all drives on a Windows system requires a specific approach. To avoid manual specification of drive letters like "program.exe C:" for each drive, a dynamic solution is sought.

By utilizing the GetLogicalDrives function from the kernel32.dll, it's possible to obtain a bit map representing available drives. The bitsToDrives function converts this bit map into a list of corresponding drive letters, such as ["A", "B", "C",...].

The following Go code demonstrates this approach:

<code class="go">package main

import (
    "fmt"
    "syscall"
)

func main() {

    kernel32, _ := syscall.LoadLibrary("kernel32.dll")
    getLogicalDrivesHandle, _ := syscall.GetProcAddress(kernel32, "GetLogicalDrives")

    var drives []string

    if ret, _, callErr := syscall.Syscall(uintptr(getLogicalDrivesHandle), 0, 0, 0, 0); callErr != 0 {
        // handle error
    } else {
        drives = bitsToDrives(uint32(ret))
    }

    fmt.Printf("%v", drives)

}

func bitsToDrives(bitMap uint32) (drives []string) {
    availableDrives := []string{"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"}

    for i := range availableDrives {
        if bitMap&1 == 1 {
            drives = append(drives, availableDrives[i])
        }
        bitMap >>= 1
    }

    return
}</code>

Using this method, you can now iterate through all drives on a Windows system seamlessly, without relying on user-specified drive letters.

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