WsReadChars

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

HRESULT WsReadChars(
    WS_XML_READER* reader,
    LPWSTR chars,
    DWORD maxCharCount,
    DWORD* actualCharCount,
    WS_ERROR* error   // optional
);

<DllImport("webservices.dll", ExactSpelling:=True)>
Public Shared Function WsReadChars(
    ByRef reader As IntPtr,   ' WS_XML_READER*
    <MarshalAs(UnmanagedType.LPWStr)> chars As System.Text.StringBuilder,   ' LPWSTR out
    maxCharCount As UInteger,   ' DWORD
    <Out> ByRef actualCharCount As UInteger,   ' DWORD* out
    [error] As IntPtr   ' WS_ERROR* optional
) As Integer
End Function

' reader : WS_XML_READER*
' chars : LPWSTR out
' maxCharCount : DWORD
' actualCharCount : DWORD* out
' error : WS_ERROR* optional
Declare PtrSafe Function WsReadChars Lib "webservices" ( _
    ByRef reader As LongPtr, _
    ByVal chars As LongPtr, _
    ByVal maxCharCount As Long, _
    ByRef actualCharCount As Long, _
    ByVal error As LongPtr) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

WsReadChars = ctypes.windll.webservices.WsReadChars
WsReadChars.restype = ctypes.c_int
WsReadChars.argtypes = [
    ctypes.c_void_p,  # reader : WS_XML_READER*
    wintypes.LPWSTR,  # chars : LPWSTR out
    wintypes.DWORD,  # maxCharCount : DWORD
    ctypes.POINTER(wintypes.DWORD),  # actualCharCount : DWORD* out
    ctypes.c_void_p,  # error : WS_ERROR* optional
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('webservices.dll')
WsReadChars = Fiddle::Function.new(
  lib['WsReadChars'],
  [
    Fiddle::TYPE_VOIDP,  # reader : WS_XML_READER*
    Fiddle::TYPE_VOIDP,  # chars : LPWSTR out
    -Fiddle::TYPE_INT,  # maxCharCount : DWORD
    Fiddle::TYPE_VOIDP,  # actualCharCount : DWORD* out
    Fiddle::TYPE_VOIDP,  # error : WS_ERROR* optional
  ],
  Fiddle::TYPE_INT)

#[link(name = "webservices")]
extern "system" {
    fn WsReadChars(
        reader: *mut isize,  // WS_XML_READER*
        chars: *mut u16,  // LPWSTR out
        maxCharCount: u32,  // DWORD
        actualCharCount: *mut u32,  // DWORD* out
        error: *mut isize  // WS_ERROR* optional
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("webservices.dll")]
public static extern int WsReadChars(ref IntPtr reader, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder chars, uint maxCharCount, out uint actualCharCount, IntPtr error);
"@
$api = Add-Type -MemberDefinition $sig -Name 'webservices_WsReadChars' -Namespace Win32 -PassThru
# $api::WsReadChars(reader, chars, maxCharCount, actualCharCount, error)

#uselib "webservices.dll"
#func global WsReadChars "WsReadChars" sptr, sptr, sptr, sptr, sptr
; WsReadChars reader, varptr(chars), maxCharCount, varptr(actualCharCount), error   ; 戻り値は stat
; reader : WS_XML_READER* -> "sptr"
; chars : LPWSTR out -> "sptr"
; maxCharCount : DWORD -> "sptr"
; actualCharCount : DWORD* out -> "sptr"
; error : WS_ERROR* optional -> "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 "webservices.dll"
#cfunc global WsReadChars "WsReadChars" int, var, int, var, int
; res = WsReadChars(reader, chars, maxCharCount, actualCharCount, error)
; reader : WS_XML_READER* -> "int"
; chars : LPWSTR out -> "var"
; maxCharCount : DWORD -> "int"
; actualCharCount : DWORD* out -> "var"
; error : WS_ERROR* optional -> "int"
; ※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。

; HRESULT WsReadChars(WS_XML_READER* reader, LPWSTR chars, DWORD maxCharCount, DWORD* actualCharCount, WS_ERROR* error)
#uselib "webservices.dll"
#cfunc global WsReadChars "WsReadChars" int, var, int, var, int
; res = WsReadChars(reader, chars, maxCharCount, actualCharCount, error)
; reader : WS_XML_READER* -> "int"
; chars : LPWSTR out -> "var"
; maxCharCount : DWORD -> "int"
; actualCharCount : DWORD* out -> "var"
; error : WS_ERROR* optional -> "int"
; ※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 (
	webservices = windows.NewLazySystemDLL("webservices.dll")
	procWsReadChars = webservices.NewProc("WsReadChars")
)

// reader (WS_XML_READER*), chars (LPWSTR out), maxCharCount (DWORD), actualCharCount (DWORD* out), error (WS_ERROR* optional)
r1, _, err := procWsReadChars.Call(
	uintptr(reader),
	uintptr(chars),
	uintptr(maxCharCount),
	uintptr(actualCharCount),
	uintptr(error),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function WsReadChars(
  reader: Pointer;   // WS_XML_READER*
  chars: PWideChar;   // LPWSTR out
  maxCharCount: DWORD;   // DWORD
  actualCharCount: Pointer;   // DWORD* out
  error: Pointer   // WS_ERROR* optional
): Integer; stdcall;
  external 'webservices.dll' name 'WsReadChars';

result := DllCall("webservices\WsReadChars"
    , "Ptr", reader   ; WS_XML_READER*
    , "Ptr", chars   ; LPWSTR out
    , "UInt", maxCharCount   ; DWORD
    , "Ptr", actualCharCount   ; DWORD* out
    , "Ptr", error   ; WS_ERROR* optional
    , "Int")   ; return: HRESULT

●WsReadChars(reader, chars, maxCharCount, actualCharCount, error) = DLL("webservices.dll", "int WsReadChars(void*, char*, dword, void*, void*)")
# 呼び出し: WsReadChars(reader, chars, maxCharCount, actualCharCount, error)
# reader : WS_XML_READER* -> "void*"
# chars : LPWSTR out -> "char*"
# maxCharCount : DWORD -> "dword"
# actualCharCount : DWORD* out -> "void*"
# error : WS_ERROR* optional -> "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)。