Convert the UTF16 Wide String (WSTR) from/to plain Go string.

lpcwstr.go

package lpcwstr

// #include <windows.h>
// #include <wchar.h>
// #include <WinNT.h>
import "C"

import (
	"unicode/utf16"
	"unsafe"
)

const maxRunes = 1<<30 - 1

func Decode(cwstr C.LPCWSTR) string {
	ptr := unsafe.Pointer(cwstr)
	sz := C.wcslen((*C.wchar_t)(ptr))
	wstr := (*[maxRunes]uint16)(ptr)[:sz:sz]
	return string(utf16.Decode(wstr))
}

func Encode(s string) C.LPCWSTR {
	wstr := utf16.Encode([]rune(s))
	wstr = append(wstr, 0x00)
	return (C.LPCWSTR)(unsafe.Pointer(&wstr[0]))
}

func Encode(s string) C.LPCWSTR {
    wstr := utf16.Encode([]rune(s))

    p := C.calloc(C.size_t(len(wstr)+1), C.sizeof_uint16_t)
    pp := (*[1 << 30]uint16)(p)
    copy(pp[:], wstr)

    return (C.LPCWSTR)(p)
}

/*On Windows,
syscall.StringToUTF16()
syscall.StringToUTF16Ptr()
syscall.UTF16FromString()
syscall.UTF16PtrFromString()
syscall.UTF16ToString()
*/