Call functions from Windows DLL file.

Call functions from Windows DLL file.

//+build windows

package colorterm

import (
	"syscall"
	"unsafe"
)

type (
	HANDLE uintptr
)

// http://msdn.microsoft.com/en-us/library/windows/desktop/ms682119.aspx
type _COORD struct {
	X, Y uint16
}

// http://msdn.microsoft.com/en-us/library/windows/desktop/ms686311.aspx
type _SMALL_RECT struct {
	Left, Top, Right, Bottom uint16
}

// http://msdn.microsoft.com/en-us/library/windows/desktop/ms682093.aspx
type _CONSOLE_SCREEN_BUFFER_INFO struct {
	DwSize              _COORD
	DwCursorPosition    _COORD
	WAttributes         uint16
	SrWindow            _SMALL_RECT
	DwMaximumWindowSize _COORD
}

var (
	modkernel32 = syscall.NewLazyDLL("kernel32.dll")

	procGetConsoleScreenBufferInfo = modkernel32.NewProc("GetConsoleScreenBufferInfo")
	procSetConsoleTextAttribute    = modkernel32.NewProc("SetConsoleTextAttribute")
	procSetConsoleTitle            = modkernel32.NewProc("SetConsoleTitle")
	procSetConsoleCursorPosition   = modkernel32.NewProc("SetConsoleCursorPosition")
	procFillConsoleOutputCharacter = modkernel32.NewProc("FillConsoleOutputCharacter")
	procFillConsoleOutputAttribute = modkernel32.NewProc("FillConsoleOutputAttribute")
	procGetStdHandle               = modkernel32.NewProc("GetStdHandle")
)

func GetConsoleScreenBufferInfo(hConsoleOutput HANDLE) *CONSOLE_SCREEN_BUFFER_INFO {
	var csbi CONSOLE_SCREEN_BUFFER_INFO
	ret, _, _ := procGetConsoleScreenBufferInfo.Call(
		uintptr(hConsoleOutput),
		uintptr(unsafe.Pointer(&csbi)))
	if ret == 0 {
		return nil
	}
	return &csbi
}