Golang：如何在没有cgo的情况下调用win32 API？

GetUserNameExsecur32.dll

dll, err := syscall.LoadDLL("secur32.dll")
if err != nil {
    log.Fatal(err)
}
defer dll.Release()

GetUserNameEx, err := dll.FindProc("GetUserNameExW")
if err != nil {
    log.Fatal(err)
}
arr := make([]uint8, 256)
var size uint
GetUserNameEx.Call(3, uintptr(unsafe.Pointer(&arr[0])), uintptr(unsafe.Pointer(&size)))
fmt.Println(arr)
fmt.Println(size)

GetUserNameEx.Call()UserName