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WsReadElement

関数
XMLリーダーから要素を読み取り値にデシリアライズする。
DLLwebservices.dll呼出規約winapi対応OSWindows 7 以降
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シグネチャ

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

HRESULT WsReadElement(
    WS_XML_READER* reader,
    const WS_ELEMENT_DESCRIPTION* elementDescription,
    WS_READ_OPTION readOption,
    WS_HEAP* heap,   // optional
    void* value,
    DWORD valueSize,
    WS_ERROR* error   // optional
);

パラメーター

名前型方向説明
readerWS_XML_READER*in対象要素に位置付けられたWS_XML_READER。
elementDescriptionWS_ELEMENT_DESCRIPTION*in読み取る要素の定義を示すWS_ELEMENT_DESCRIPTION。
readOptionWS_READ_OPTIONin値の必須有無や割り当て方法を示すWS_READ_OPTION。
heapWS_HEAP*inoptional可変長データの確保に使うWS_HEAP。
valuevoid*out読み取った値を受け取る出力バッファへのポインタ。
valueSizeDWORDinvalueバッファのバイトサイズを指定する。
errorWS_ERROR*inoptional詳細なエラー情報を格納するWS_ERRORオブジェクト。NULL可。

戻り値の型: HRESULT

各言語での呼び出し定義

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

HRESULT WsReadElement(
    WS_XML_READER* reader,
    const WS_ELEMENT_DESCRIPTION* elementDescription,
    WS_READ_OPTION readOption,
    WS_HEAP* heap,   // optional
    void* value,
    DWORD valueSize,
    WS_ERROR* error   // optional
);
[DllImport("webservices.dll", ExactSpelling = true)]
static extern int WsReadElement(
    ref IntPtr reader,   // WS_XML_READER*
    IntPtr elementDescription,   // WS_ELEMENT_DESCRIPTION*
    int readOption,   // WS_READ_OPTION
    IntPtr heap,   // WS_HEAP* optional
    IntPtr value,   // void* out
    uint valueSize,   // DWORD
    IntPtr error   // WS_ERROR* optional
);
<DllImport("webservices.dll", ExactSpelling:=True)>
Public Shared Function WsReadElement(
    ByRef reader As IntPtr,   ' WS_XML_READER*
    elementDescription As IntPtr,   ' WS_ELEMENT_DESCRIPTION*
    readOption As Integer,   ' WS_READ_OPTION
    heap As IntPtr,   ' WS_HEAP* optional
    value As IntPtr,   ' void* out
    valueSize As UInteger,   ' DWORD
    [error] As IntPtr   ' WS_ERROR* optional
) As Integer
End Function
' reader : WS_XML_READER*
' elementDescription : WS_ELEMENT_DESCRIPTION*
' readOption : WS_READ_OPTION
' heap : WS_HEAP* optional
' value : void* out
' valueSize : DWORD
' error : WS_ERROR* optional
Declare PtrSafe Function WsReadElement Lib "webservices" ( _
    ByRef reader As LongPtr, _
    ByVal elementDescription As LongPtr, _
    ByVal readOption As Long, _
    ByVal heap As LongPtr, _
    ByVal value As LongPtr, _
    ByVal valueSize 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

WsReadElement = ctypes.windll.webservices.WsReadElement
WsReadElement.restype = ctypes.c_int
WsReadElement.argtypes = [
    ctypes.c_void_p,  # reader : WS_XML_READER*
    ctypes.c_void_p,  # elementDescription : WS_ELEMENT_DESCRIPTION*
    ctypes.c_int,  # readOption : WS_READ_OPTION
    ctypes.c_void_p,  # heap : WS_HEAP* optional
    ctypes.POINTER(None),  # value : void* out
    wintypes.DWORD,  # valueSize : DWORD
    ctypes.c_void_p,  # error : WS_ERROR* optional
]
require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('webservices.dll')
WsReadElement = Fiddle::Function.new(
  lib['WsReadElement'],
  [
    Fiddle::TYPE_VOIDP,  # reader : WS_XML_READER*
    Fiddle::TYPE_VOIDP,  # elementDescription : WS_ELEMENT_DESCRIPTION*
    Fiddle::TYPE_INT,  # readOption : WS_READ_OPTION
    Fiddle::TYPE_VOIDP,  # heap : WS_HEAP* optional
    Fiddle::TYPE_VOIDP,  # value : void* out
    -Fiddle::TYPE_INT,  # valueSize : DWORD
    Fiddle::TYPE_VOIDP,  # error : WS_ERROR* optional
  ],
  Fiddle::TYPE_INT)
#[link(name = "webservices")]
extern "system" {
    fn WsReadElement(
        reader: *mut isize,  // WS_XML_READER*
        elementDescription: *const WS_ELEMENT_DESCRIPTION,  // WS_ELEMENT_DESCRIPTION*
        readOption: i32,  // WS_READ_OPTION
        heap: *mut isize,  // WS_HEAP* optional
        value: *mut (),  // void* out
        valueSize: u32,  // DWORD
        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 WsReadElement(ref IntPtr reader, IntPtr elementDescription, int readOption, IntPtr heap, IntPtr value, uint valueSize, IntPtr error);
"@
$api = Add-Type -MemberDefinition $sig -Name 'webservices_WsReadElement' -Namespace Win32 -PassThru
# $api::WsReadElement(reader, elementDescription, readOption, heap, value, valueSize, error)
#uselib "webservices.dll"
#func global WsReadElement "WsReadElement" sptr, sptr, sptr, sptr, sptr, sptr, sptr
; WsReadElement varptr(reader), varptr(elementDescription), readOption, varptr(heap), value, valueSize, varptr(error)   ; 戻り値は stat
; reader : WS_XML_READER* -> "sptr"
; elementDescription : WS_ELEMENT_DESCRIPTION* -> "sptr"
; readOption : WS_READ_OPTION -> "sptr"
; heap : WS_HEAP* optional -> "sptr"
; value : void* out -> "sptr"
; valueSize : DWORD -> "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。
出力引数: 
#uselib "webservices.dll"
#cfunc global WsReadElement "WsReadElement" var, var, int, var, sptr, int, var
; res = WsReadElement(reader, elementDescription, readOption, heap, value, valueSize, error)
; reader : WS_XML_READER* -> "var"
; elementDescription : WS_ELEMENT_DESCRIPTION* -> "var"
; readOption : WS_READ_OPTION -> "int"
; heap : WS_HEAP* optional -> "var"
; value : void* out -> "sptr"
; valueSize : DWORD -> "int"
; error : WS_ERROR* optional -> "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。
出力引数: 
; HRESULT WsReadElement(WS_XML_READER* reader, WS_ELEMENT_DESCRIPTION* elementDescription, WS_READ_OPTION readOption, WS_HEAP* heap, void* value, DWORD valueSize, WS_ERROR* error)
#uselib "webservices.dll"
#cfunc global WsReadElement "WsReadElement" var, var, int, var, intptr, int, var
; res = WsReadElement(reader, elementDescription, readOption, heap, value, valueSize, error)
; reader : WS_XML_READER* -> "var"
; elementDescription : WS_ELEMENT_DESCRIPTION* -> "var"
; readOption : WS_READ_OPTION -> "int"
; heap : WS_HEAP* optional -> "var"
; value : void* out -> "intptr"
; valueSize : DWORD -> "int"
; error : WS_ERROR* optional -> "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 (
	webservices = windows.NewLazySystemDLL("webservices.dll")
	procWsReadElement = webservices.NewProc("WsReadElement")
)

// reader (WS_XML_READER*), elementDescription (WS_ELEMENT_DESCRIPTION*), readOption (WS_READ_OPTION), heap (WS_HEAP* optional), value (void* out), valueSize (DWORD), error (WS_ERROR* optional)
r1, _, err := procWsReadElement.Call(
	uintptr(reader),
	uintptr(elementDescription),
	uintptr(readOption),
	uintptr(heap),
	uintptr(value),
	uintptr(valueSize),
	uintptr(error),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT
function WsReadElement(
  reader: Pointer;   // WS_XML_READER*
  elementDescription: Pointer;   // WS_ELEMENT_DESCRIPTION*
  readOption: Integer;   // WS_READ_OPTION
  heap: Pointer;   // WS_HEAP* optional
  value: Pointer;   // void* out
  valueSize: DWORD;   // DWORD
  error: Pointer   // WS_ERROR* optional
): Integer; stdcall;
  external 'webservices.dll' name 'WsReadElement';
result := DllCall("webservices\WsReadElement"
    , "Ptr", reader   ; WS_XML_READER*
    , "Ptr", elementDescription   ; WS_ELEMENT_DESCRIPTION*
    , "Int", readOption   ; WS_READ_OPTION
    , "Ptr", heap   ; WS_HEAP* optional
    , "Ptr", value   ; void* out
    , "UInt", valueSize   ; DWORD
    , "Ptr", error   ; WS_ERROR* optional
    , "Int")   ; return: HRESULT
●WsReadElement(reader, elementDescription, readOption, heap, value, valueSize, error) = DLL("webservices.dll", "int WsReadElement(void*, void*, int, void*, void*, dword, void*)")
# 呼び出し: WsReadElement(reader, elementDescription, readOption, heap, value, valueSize, error)
# reader : WS_XML_READER* -> "void*"
# elementDescription : WS_ELEMENT_DESCRIPTION* -> "void*"
# readOption : WS_READ_OPTION -> "int"
# heap : WS_HEAP* optional -> "void*"
# value : void* out -> "void*"
# valueSize : DWORD -> "dword"
# 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)。
const std = @import("std");

extern "webservices" fn WsReadElement(
    reader: [*c]isize, // WS_XML_READER*
    elementDescription: [*c]WS_ELEMENT_DESCRIPTION, // WS_ELEMENT_DESCRIPTION*
    readOption: i32, // WS_READ_OPTION
    heap: [*c]isize, // WS_HEAP* optional
    value: ?*anyopaque, // void* out
    valueSize: u32, // DWORD
    error: [*c]isize // WS_ERROR* optional
) callconv(std.os.windows.WINAPI) i32;
proc WsReadElement(
    reader: ptr int,  # WS_XML_READER*
    elementDescription: ptr WS_ELEMENT_DESCRIPTION,  # WS_ELEMENT_DESCRIPTION*
    readOption: int32,  # WS_READ_OPTION
    heap: ptr int,  # WS_HEAP* optional
    value: pointer,  # void* out
    valueSize: uint32,  # DWORD
    error: ptr int  # WS_ERROR* optional
): int32 {.importc: "WsReadElement", stdcall, dynlib: "webservices.dll".}
pragma(lib, "webservices");
extern(Windows)
int WsReadElement(
    ptrdiff_t* reader,   // WS_XML_READER*
    WS_ELEMENT_DESCRIPTION* elementDescription,   // WS_ELEMENT_DESCRIPTION*
    int readOption,   // WS_READ_OPTION
    ptrdiff_t* heap,   // WS_HEAP* optional
    void* value,   // void* out
    uint valueSize,   // DWORD
    ptrdiff_t* error   // WS_ERROR* optional
);
ccall((:WsReadElement, "webservices.dll"), stdcall, Int32,
      (Ptr{Int}, Ptr{WS_ELEMENT_DESCRIPTION}, Int32, Ptr{Int}, Ptr{Cvoid}, UInt32, Ptr{Int}),
      reader, elementDescription, readOption, heap, value, valueSize, error)
# reader : WS_XML_READER* -> Ptr{Int}
# elementDescription : WS_ELEMENT_DESCRIPTION* -> Ptr{WS_ELEMENT_DESCRIPTION}
# readOption : WS_READ_OPTION -> Int32
# heap : WS_HEAP* optional -> Ptr{Int}
# value : void* out -> Ptr{Cvoid}
# valueSize : DWORD -> UInt32
# error : WS_ERROR* optional -> Ptr{Int}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。
local ffi = require("ffi")
ffi.cdef[[
int32_t WsReadElement(
    intptr_t* reader,
    void* elementDescription,
    int32_t readOption,
    intptr_t* heap,
    void* value,
    uint32_t valueSize,
    intptr_t* error);
]]
local webservices = ffi.load("webservices")
-- webservices.WsReadElement(reader, elementDescription, readOption, heap, value, valueSize, error)
-- reader : WS_XML_READER*
-- elementDescription : WS_ELEMENT_DESCRIPTION*
-- readOption : WS_READ_OPTION
-- heap : WS_HEAP* optional
-- value : void* out
-- valueSize : DWORD
-- error : WS_ERROR* optional
-- 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。
const koffi = require('koffi');
const lib = koffi.load('webservices.dll');
const WsReadElement = lib.func('__stdcall', 'WsReadElement', 'int32_t', ['intptr_t *', 'void *', 'int32_t', 'intptr_t *', 'void *', 'uint32_t', 'intptr_t *']);
// WsReadElement(reader, elementDescription, readOption, heap, value, valueSize, error)
// reader : WS_XML_READER* -> 'intptr_t *'
// elementDescription : WS_ELEMENT_DESCRIPTION* -> 'void *'
// readOption : WS_READ_OPTION -> 'int32_t'
// heap : WS_HEAP* optional -> 'intptr_t *'
// value : void* out -> 'void *'
// valueSize : DWORD -> 'uint32_t'
// error : WS_ERROR* optional -> 'intptr_t *'
// 出力ポインタは koffi.out(...) で包む。構造体は koffi.struct で定義。
const lib = Deno.dlopen("webservices.dll", {
  WsReadElement: { parameters: ["pointer", "pointer", "i32", "pointer", "pointer", "u32", "pointer"], result: "i32" },
});
// lib.symbols.WsReadElement(reader, elementDescription, readOption, heap, value, valueSize, error)
// reader : WS_XML_READER* -> "pointer"
// elementDescription : WS_ELEMENT_DESCRIPTION* -> "pointer"
// readOption : WS_READ_OPTION -> "i32"
// heap : WS_HEAP* optional -> "pointer"
// value : void* out -> "pointer"
// valueSize : DWORD -> "u32"
// error : WS_ERROR* optional -> "pointer"
// 文字列引数は "buffer"(NUL 終端のバイト列を Uint8Array で渡す)。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。
<?php
$ffi = FFI::cdef(<<<C
int32_t WsReadElement(
    intptr_t* reader,
    void* elementDescription,
    int32_t readOption,
    intptr_t* heap,
    void* value,
    uint32_t valueSize,
    intptr_t* error);
C, "webservices.dll");
// $ffi->WsReadElement(reader, elementDescription, readOption, heap, value, valueSize, error);
// reader : WS_XML_READER*
// elementDescription : WS_ELEMENT_DESCRIPTION*
// readOption : WS_READ_OPTION
// heap : WS_HEAP* optional
// value : void* out
// valueSize : DWORD
// error : WS_ERROR* optional
// 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。
// WINAPI(stdcall): x64 では呼出規約が統一されるため問題なし。x86 では __stdcall 対応のラッパが必要な場合あり。
import com.sun.jna.*;
import com.sun.jna.ptr.*;
import com.sun.jna.win32.StdCallLibrary;
import com.sun.jna.win32.W32APIOptions;

public interface Webservices extends StdCallLibrary {
    Webservices INSTANCE = Native.load("webservices", Webservices.class);
    int WsReadElement(
        LongByReference reader,   // WS_XML_READER*
        Pointer elementDescription,   // WS_ELEMENT_DESCRIPTION*
        int readOption,   // WS_READ_OPTION
        LongByReference heap,   // WS_HEAP* optional
        Pointer value,   // void* out
        int valueSize,   // DWORD
        LongByReference error   // WS_ERROR* optional
    );
}
@[Link("webservices")]
lib Libwebservices
  fun WsReadElement = WsReadElement(
    reader : LibC::SSizeT*,   # WS_XML_READER*
    elementDescription : WS_ELEMENT_DESCRIPTION*,   # WS_ELEMENT_DESCRIPTION*
    readOption : Int32,   # WS_READ_OPTION
    heap : LibC::SSizeT*,   # WS_HEAP* optional
    value : Void*,   # void* out
    valueSize : UInt32,   # DWORD
    error : LibC::SSizeT*   # WS_ERROR* optional
  ) : Int32
end
# 構造体/GUID/enum は lib 内に対応する型定義が必要。
# 呼出規約: x64 は規約統一のため OK。x86(32bit)は WINAPI=stdcall だが Crystal の fun に stdcall 付与構文がなく非対応。
import 'dart:ffi';
import 'package:ffi/ffi.dart';

typedef WsReadElementNative = Int32 Function(Pointer<IntPtr>, Pointer<Void>, Int32, Pointer<IntPtr>, Pointer<Void>, Uint32, Pointer<IntPtr>);
typedef WsReadElementDart = int Function(Pointer<IntPtr>, Pointer<Void>, int, Pointer<IntPtr>, Pointer<Void>, int, Pointer<IntPtr>);
final WsReadElement = DynamicLibrary.open('webservices.dll')
    .lookupFunction<WsReadElementNative, WsReadElementDart>('WsReadElement');
// reader : WS_XML_READER* -> Pointer<IntPtr>
// elementDescription : WS_ELEMENT_DESCRIPTION* -> Pointer<Void>
// readOption : WS_READ_OPTION -> Int32
// heap : WS_HEAP* optional -> Pointer<IntPtr>
// value : void* out -> Pointer<Void>
// valueSize : DWORD -> Uint32
// error : WS_ERROR* optional -> Pointer<IntPtr>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。
{$mode objfpc}{$H+}
function WsReadElement(
  reader: Pointer;   // WS_XML_READER*
  elementDescription: Pointer;   // WS_ELEMENT_DESCRIPTION*
  readOption: Integer;   // WS_READ_OPTION
  heap: Pointer;   // WS_HEAP* optional
  value: Pointer;   // void* out
  valueSize: DWORD;   // DWORD
  error: Pointer   // WS_ERROR* optional
): Integer; stdcall;
  external 'webservices.dll' name 'WsReadElement';
import Foreign
import Foreign.C.Types
import Foreign.C.String

foreign import stdcall safe "WsReadElement"
  c_WsReadElement :: Ptr CIntPtr -> Ptr () -> Int32 -> Ptr CIntPtr -> Ptr () -> Word32 -> Ptr CIntPtr -> IO Int32
-- reader : WS_XML_READER* -> Ptr CIntPtr
-- elementDescription : WS_ELEMENT_DESCRIPTION* -> Ptr ()
-- readOption : WS_READ_OPTION -> Int32
-- heap : WS_HEAP* optional -> Ptr CIntPtr
-- value : void* out -> Ptr ()
-- valueSize : DWORD -> Word32
-- error : WS_ERROR* optional -> Ptr CIntPtr
-- 要 GHC(Windows)。stdcall は x64 では ccall として扱われる。ブロックする API は safe 呼び出し推奨。
open Ctypes
open Foreign

let wsreadelement =
  foreign "WsReadElement"
    ((ptr intptr_t) @-> (ptr void) @-> int32_t @-> (ptr intptr_t) @-> (ptr void) @-> uint32_t @-> (ptr intptr_t) @-> returning int32_t)
(* reader : WS_XML_READER* -> (ptr intptr_t) *)
(* elementDescription : WS_ELEMENT_DESCRIPTION* -> (ptr void) *)
(* readOption : WS_READ_OPTION -> int32_t *)
(* heap : WS_HEAP* optional -> (ptr intptr_t) *)
(* value : void* out -> (ptr void) *)
(* valueSize : DWORD -> uint32_t *)
(* error : WS_ERROR* optional -> (ptr intptr_t) *)
(* foreign は cdecl 前提。x64 Windows では WINAPI と一致。構造体は ctypes structure を定義のこと。 *)
(cffi:define-foreign-library webservices (t "webservices.dll"))
(cffi:use-foreign-library webservices)

(cffi:defcfun ("WsReadElement" ws-read-element :convention :stdcall) :int32
  (reader :pointer)   ; WS_XML_READER*
  (element-description :pointer)   ; WS_ELEMENT_DESCRIPTION*
  (read-option :int32)   ; WS_READ_OPTION
  (heap :pointer)   ; WS_HEAP* optional
  (value :pointer)   ; void* out
  (value-size :uint32)   ; DWORD
  (error :pointer))   ; WS_ERROR* optional
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。
use Win32::API;
my $WsReadElement = Win32::API::More->new('webservices',
    'int WsReadElement(LPVOID reader, LPVOID elementDescription, int readOption, LPVOID heap, LPVOID value, DWORD valueSize, LPVOID error)');
# my $ret = $WsReadElement->Call($reader, $elementDescription, $readOption, $heap, $value, $valueSize, $error);
# reader : WS_XML_READER* -> LPVOID
# elementDescription : WS_ELEMENT_DESCRIPTION* -> LPVOID
# readOption : WS_READ_OPTION -> int
# heap : WS_HEAP* optional -> LPVOID
# value : void* out -> LPVOID
# valueSize : DWORD -> DWORD
# error : WS_ERROR* optional -> LPVOID
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。

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