Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

x/sys/windows: GetDriveType should call "GetDriveTypeW" #23121

zosmac opened this issue Dec 13, 2017 · 1 comment

x/sys/windows: GetDriveType should call "GetDriveTypeW" #23121

zosmac opened this issue Dec 13, 2017 · 1 comment


Copy link

@zosmac zosmac commented Dec 13, 2017

Please answer these questions before submitting your issue. Thanks!

What version of Go are you using (go version)?

go version go1.9.2 darwin/amd64

Does this issue reproduce with the latest release?


What operating system and processor architecture are you using (go env)?

uname -a
Darwin [] 17.3.0 Darwin Kernel Version 17.3.0: Thu Nov 9 18:09:22 PST 2017; root:xnu-4570.31.3~1/RELEASE_X86_64 x86_64

What did you do?

// getdrivetype project main.go
package main

import (


var (
	modkernel32      = windows.NewLazySystemDLL("kernel32.dll")
	procGetDriveType = modkernel32.NewProc("GetDriveTypeW")

func main() {
	path, _ := filepath.Abs(".")
	wpath, _ := windows.UTF16PtrFromString(path)
	wvolume := make([]uint16, len(path)+1)
	if err := windows.GetVolumePathName(wpath, &wvolume[0], uint32(len(wvolume))); err != nil {
	volume := windows.UTF16ToString(wvolume)

	dtp, _, _ := procGetDriveType.Call(uintptr(unsafe.Pointer(&wvolume[0])))
	fmt.Printf("path: %s volume: %s type: %s\n", path, volume, driveType(uint32(dtp)))

	dt32 := windows.GetDriveType(&wvolume[0])
	fmt.Printf("drive type for %s is %s\n", path, driveType(dt32))

func driveType(dt uint32) string {
	switch dt {
	case windows.DRIVE_CDROM:
		return "cd-rom"
	case windows.DRIVE_FIXED:
		return "fixed"
	case windows.DRIVE_NO_ROOT_DIR:
		return "no-root-dir"
	case windows.DRIVE_RAMDISK:
		return "ram-disk"
	case windows.DRIVE_REMOTE:
		return "remote"
	case windows.DRIVE_REMOVABLE:
		return "removable"
	case windows.DRIVE_UNKNOWN:
		return "unknown"
	return "unrecognized"

What did you expect to see?

path: c:\Users\zosmac volume: c:\ type: fixed
path: c:\Users\zosmac volume: c:\ type: fixed

What did you see instead?

path: c:\Users\zosmac volume: c:\ type: fixed
panic: Failed to find GetDriveType procedure in kernel32.dll: The specified procedure could not be found.

goroutine 1 [running]:*LazyProc).mustFind(0xc04206bc80)
        /Users/zosmac/go/src/ +0x5f*LazyProc).Addr(0xc04206bc80, 0x4d977c)
        /Users/zosmac/go/src/ +0x32, 0x1d)
        /Users/zosmac/go/src/ +0x34
        /Users/zosmac/go/src/tests/getdrivetype/main.go:30 +0x341
@bradfitz bradfitz changed the title windows.GetDriveType should call "GetDriveTypeW" x/sys/windows: GetDriveType should call "GetDriveTypeW" Dec 13, 2017
@gopherbot gopherbot added this to the Unreleased milestone Dec 13, 2017
Copy link

@gopherbot gopherbot commented Dec 13, 2017

Change mentions this issue: windows: make GetDriveType use GetDriveTypeW

@golang golang locked and limited conversation to collaborators Dec 13, 2018
Sign up for free to subscribe to this conversation on GitHub. Already have an account? Sign in.
None yet
Linked pull requests

Successfully merging a pull request may close this issue.

None yet
3 participants
You can’t perform that action at this time.