JsGetStringLength

// chakra.dll
#include <windows.h>

JsErrorCode JsGetStringLength(
    void* stringValue,
    INT* length
);

<DllImport("chakra.dll", ExactSpelling:=True)>
Public Shared Function JsGetStringLength(
    stringValue As IntPtr,   ' void*
    <Out> ByRef length As Integer   ' INT* out
) As UInteger
End Function

' stringValue : void*
' length : INT* out
Declare PtrSafe Function JsGetStringLength Lib "chakra" ( _
    ByVal stringValue As LongPtr, _
    ByRef length As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

JsGetStringLength = ctypes.windll.chakra.JsGetStringLength
JsGetStringLength.restype = wintypes.DWORD
JsGetStringLength.argtypes = [
    ctypes.POINTER(None),  # stringValue : void*
    ctypes.POINTER(ctypes.c_int),  # length : INT* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('chakra.dll')
JsGetStringLength = Fiddle::Function.new(
  lib['JsGetStringLength'],
  [
    Fiddle::TYPE_VOIDP,  # stringValue : void*
    Fiddle::TYPE_VOIDP,  # length : INT* out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "chakra")]
extern "system" {
    fn JsGetStringLength(
        stringValue: *mut (),  // void*
        length: *mut i32  // INT* out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("chakra.dll")]
public static extern uint JsGetStringLength(IntPtr stringValue, out int length);
"@
$api = Add-Type -MemberDefinition $sig -Name 'chakra_JsGetStringLength' -Namespace Win32 -PassThru
# $api::JsGetStringLength(stringValue, length)

#uselib "chakra.dll"
#func global JsGetStringLength "JsGetStringLength" sptr, sptr
; JsGetStringLength stringValue, varptr(length)   ; 戻り値は stat
; stringValue : void* -> "sptr"
; length : INT* out -> "sptr"
; ※HSP3.7は #func のため戻り値はシステム変数 stat に格納されます。

#uselib "chakra.dll"
#cfunc global JsGetStringLength "JsGetStringLength" sptr, var
; res = JsGetStringLength(stringValue, length)
; stringValue : void* -> "sptr"
; length : INT* out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

; JsErrorCode JsGetStringLength(void* stringValue, INT* length)
#uselib "chakra.dll"
#cfunc global JsGetStringLength "JsGetStringLength" intptr, var
; res = JsGetStringLength(stringValue, length)
; stringValue : void* -> "intptr"
; length : INT* out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	chakra = windows.NewLazySystemDLL("chakra.dll")
	procJsGetStringLength = chakra.NewProc("JsGetStringLength")
)

// stringValue (void*), length (INT* out)
r1, _, err := procJsGetStringLength.Call(
	uintptr(stringValue),
	uintptr(length),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // JsErrorCode

function JsGetStringLength(
  stringValue: Pointer;   // void*
  length: Pointer   // INT* out
): DWORD; stdcall;
  external 'chakra.dll' name 'JsGetStringLength';

result := DllCall("chakra\JsGetStringLength"
    , "Ptr", stringValue   ; void*
    , "Ptr", length   ; INT* out
    , "UInt")   ; return: JsErrorCode

●JsGetStringLength(stringValue, length) = DLL("chakra.dll", "dword JsGetStringLength(void*, void*)")
# 呼び出し: JsGetStringLength(stringValue, length)
# stringValue : void* -> "void*"
# length : INT* out -> "void*"
# なでしこ1は32bit・ANSI(Shift_JIS)。文字列=char*(ANSI)、ポインタ/ハンドル=void*(4byte)。