尝试通过syscall获取win32下的磁盘空间信息

gistfile1.go

package main

import (
  "log"
	"net/http"
	"syscall"
	"unsafe"
)

func main() {
	kernel32, err := syscall.LoadLibrary("Kernel32.dll")
	if err != nil {
		log.Panic(err)
	}
	defer syscall.FreeLibrary(kernel32)
	GetDiskFreeSpaceEx, err := syscall.GetProcAddress(syscall.Handle(kernel32), "GetDiskFreeSpaceExW")
	
	if err != nil {
		log.Panic(err)
	}

	lpFreeBytesAvailable := int64(0)
	lpTotalNumberOfBytes := int64(0)
	lpTotalNumberOfFreeBytes := int64(0)
	r, a, b := syscall.Syscall(uintptr(GetDiskFreeSpaceEx),
		uintptr(unsafe.Pointer(syscall.StringToUTF16Ptr("C:"))),
		uintptr(unsafe.Pointer(&lpFreeBytesAvailable)),
		uintptr(unsafe.Pointer(&lpTotalNumberOfBytes)),
		uintptr(unsafe.Pointer(&lpTotalNumberOfFreeBytes)))
	log.Println(r, a, b, lpFreeBytesAvailable, lpTotalNumberOfBytes, lpTotalNumberOfFreeBytes)
}