// Code generated by 'go generate'; DO NOT EDIT.

package windows

import (
	"syscall"
	"unsafe"
)

var _ unsafe.Pointer

// Do the interface allocations only once for common
// Errno values.
const (
	errnoERROR_IO_PENDING = 997
)

var (
	errERROR_IO_PENDING error = syscall.Errno(errnoERROR_IO_PENDING)
	errERROR_EINVAL     error = syscall.EINVAL
)

// errnoErr returns common boxed Errno values, to prevent
// allocations at runtime.
func errnoErr(e syscall.Errno) error {
	switch e {
	case 0:
		return errERROR_EINVAL
	case errnoERROR_IO_PENDING:
		return errERROR_IO_PENDING
	}
	// TODO: add more here, after collecting data on the common
	// error values see on Windows. (perhaps when running
	// all.bat?)
	return e
}

var (
	moduser32 = NewLazySystemDLL("user32.dll")

	procGetKeyboardLayout = moduser32.NewProc("GetKeyboardLayout")
	procToUnicodeEx       = moduser32.NewProc("ToUnicodeEx")
)

func GetKeyboardLayout(threadId uint32) (hkl Handle, err error) {
	r0, _, e1 := syscall.Syscall(procGetKeyboardLayout.Addr(), 1, uintptr(threadId), 0, 0)
	hkl = Handle(r0)
	if hkl == 0 {
		err = errnoErr(e1)
	}
	return
}

func ToUnicodeEx(vkey uint32, scancode uint32, keystate *byte, pwszBuff *uint16, cchBuff int32, flags uint32, hkl Handle) (ret int32, err error) {
	r0, _, e1 := syscall.Syscall9(procToUnicodeEx.Addr(), 7, uintptr(vkey), uintptr(scancode), uintptr(unsafe.Pointer(keystate)), uintptr(unsafe.Pointer(pwszBuff)), uintptr(cchBuff), uintptr(flags), uintptr(hkl), 0, 0)
	ret = int32(r0)
	if ret == 0 {
		err = errnoErr(e1)
	}
	return
}