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WideCharToMultiByte

関数

Unicode文字列をマルチバイト文字列に変換する。

DLLKERNEL32.dll呼出規約winapiSetLastErrorあり対応OSWindows 2000 以降

シグネチャ

// KERNEL32.dll
#include <windows.h>

INT WideCharToMultiByte(
    DWORD CodePage,
    DWORD dwFlags,
    LPCWSTR lpWideCharStr,
    INT cchWideChar,
    LPSTR lpMultiByteStr,   // optional
    INT cbMultiByte,
    LPCSTR lpDefaultChar,   // optional
    BOOL* lpUsedDefaultChar   // optional
);

パラメーター

名前	型	方向
CodePage	DWORD	in
dwFlags	DWORD	in
lpWideCharStr	LPCWSTR	in
cchWideChar	INT	in
lpMultiByteStr	LPSTR	outoptional
cbMultiByte	INT	in
lpDefaultChar	LPCSTR	inoptional
lpUsedDefaultChar	BOOL*	outoptional

戻り値の型: INT

各言語での呼び出し定義

// KERNEL32.dll
#include <windows.h>

INT WideCharToMultiByte(
    DWORD CodePage,
    DWORD dwFlags,
    LPCWSTR lpWideCharStr,
    INT cchWideChar,
    LPSTR lpMultiByteStr,   // optional
    INT cbMultiByte,
    LPCSTR lpDefaultChar,   // optional
    BOOL* lpUsedDefaultChar   // optional
);

[DllImport("KERNEL32.dll", SetLastError = true, ExactSpelling = true)]
static extern int WideCharToMultiByte(
    uint CodePage,   // DWORD
    uint dwFlags,   // DWORD
    [MarshalAs(UnmanagedType.LPWStr)] string lpWideCharStr,   // LPCWSTR
    int cchWideChar,   // INT
    [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder lpMultiByteStr,   // LPSTR optional, out
    int cbMultiByte,   // INT
    [MarshalAs(UnmanagedType.LPStr)] string lpDefaultChar,   // LPCSTR optional
    IntPtr lpUsedDefaultChar   // BOOL* optional, out
);

<DllImport("KERNEL32.dll", SetLastError:=True, ExactSpelling:=True)>
Public Shared Function WideCharToMultiByte(
    CodePage As UInteger,   ' DWORD
    dwFlags As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPWStr)> lpWideCharStr As String,   ' LPCWSTR
    cchWideChar As Integer,   ' INT
    <MarshalAs(UnmanagedType.LPStr)> lpMultiByteStr As System.Text.StringBuilder,   ' LPSTR optional, out
    cbMultiByte As Integer,   ' INT
    <MarshalAs(UnmanagedType.LPStr)> lpDefaultChar As String,   ' LPCSTR optional
    lpUsedDefaultChar As IntPtr   ' BOOL* optional, out
) As Integer
End Function

' CodePage : DWORD
' dwFlags : DWORD
' lpWideCharStr : LPCWSTR
' cchWideChar : INT
' lpMultiByteStr : LPSTR optional, out
' cbMultiByte : INT
' lpDefaultChar : LPCSTR optional
' lpUsedDefaultChar : BOOL* optional, out
Declare PtrSafe Function WideCharToMultiByte Lib "kernel32" ( _
    ByVal CodePage As Long, _
    ByVal dwFlags As Long, _
    ByVal lpWideCharStr As LongPtr, _
    ByVal cchWideChar As Long, _
    ByVal lpMultiByteStr As String, _
    ByVal cbMultiByte As Long, _
    ByVal lpDefaultChar As String, _
    ByVal lpUsedDefaultChar 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

WideCharToMultiByte = ctypes.windll.kernel32.WideCharToMultiByte
WideCharToMultiByte.restype = ctypes.c_int
WideCharToMultiByte.argtypes = [
    wintypes.DWORD,  # CodePage : DWORD
    wintypes.DWORD,  # dwFlags : DWORD
    wintypes.LPCWSTR,  # lpWideCharStr : LPCWSTR
    ctypes.c_int,  # cchWideChar : INT
    wintypes.LPSTR,  # lpMultiByteStr : LPSTR optional, out
    ctypes.c_int,  # cbMultiByte : INT
    wintypes.LPCSTR,  # lpDefaultChar : LPCSTR optional
    ctypes.c_void_p,  # lpUsedDefaultChar : BOOL* optional, out
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('KERNEL32.dll')
WideCharToMultiByte = Fiddle::Function.new(
  lib['WideCharToMultiByte'],
  [
    -Fiddle::TYPE_INT,  # CodePage : DWORD
    -Fiddle::TYPE_INT,  # dwFlags : DWORD
    Fiddle::TYPE_VOIDP,  # lpWideCharStr : LPCWSTR
    Fiddle::TYPE_INT,  # cchWideChar : INT
    Fiddle::TYPE_VOIDP,  # lpMultiByteStr : LPSTR optional, out
    Fiddle::TYPE_INT,  # cbMultiByte : INT
    Fiddle::TYPE_VOIDP,  # lpDefaultChar : LPCSTR optional
    Fiddle::TYPE_VOIDP,  # lpUsedDefaultChar : BOOL* optional, out
  ],
  Fiddle::TYPE_INT)

#[link(name = "kernel32")]
extern "system" {
    fn WideCharToMultiByte(
        CodePage: u32,  // DWORD
        dwFlags: u32,  // DWORD
        lpWideCharStr: *const u16,  // LPCWSTR
        cchWideChar: i32,  // INT
        lpMultiByteStr: *mut u8,  // LPSTR optional, out
        cbMultiByte: i32,  // INT
        lpDefaultChar: *const u8,  // LPCSTR optional
        lpUsedDefaultChar: *mut i32  // BOOL* optional, out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("KERNEL32.dll", SetLastError = true)]
public static extern int WideCharToMultiByte(uint CodePage, uint dwFlags, [MarshalAs(UnmanagedType.LPWStr)] string lpWideCharStr, int cchWideChar, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder lpMultiByteStr, int cbMultiByte, [MarshalAs(UnmanagedType.LPStr)] string lpDefaultChar, IntPtr lpUsedDefaultChar);
"@
$api = Add-Type -MemberDefinition $sig -Name 'KERNEL32_WideCharToMultiByte' -Namespace Win32 -PassThru
# $api::WideCharToMultiByte(CodePage, dwFlags, lpWideCharStr, cchWideChar, lpMultiByteStr, cbMultiByte, lpDefaultChar, lpUsedDefaultChar)

#uselib "KERNEL32.dll"
#func global WideCharToMultiByte "WideCharToMultiByte" sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr
; WideCharToMultiByte CodePage, dwFlags, lpWideCharStr, cchWideChar, varptr(lpMultiByteStr), cbMultiByte, lpDefaultChar, lpUsedDefaultChar   ; 戻り値は stat
; CodePage : DWORD -> "sptr"
; dwFlags : DWORD -> "sptr"
; lpWideCharStr : LPCWSTR -> "sptr"
; cchWideChar : INT -> "sptr"
; lpMultiByteStr : LPSTR optional, out -> "sptr"
; cbMultiByte : INT -> "sptr"
; lpDefaultChar : LPCSTR optional -> "sptr"
; lpUsedDefaultChar : BOOL* optional, 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。

出力引数:

#uselib "KERNEL32.dll"
#cfunc global WideCharToMultiByte "WideCharToMultiByte" int, int, wstr, int, var, int, str, int
; res = WideCharToMultiByte(CodePage, dwFlags, lpWideCharStr, cchWideChar, lpMultiByteStr, cbMultiByte, lpDefaultChar, lpUsedDefaultChar)
; CodePage : DWORD -> "int"
; dwFlags : DWORD -> "int"
; lpWideCharStr : LPCWSTR -> "wstr"
; cchWideChar : INT -> "int"
; lpMultiByteStr : LPSTR optional, out -> "var"
; cbMultiByte : INT -> "int"
; lpDefaultChar : LPCSTR optional -> "str"
; lpUsedDefaultChar : BOOL* optional, out -> "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。#uselib "KERNEL32.dll"
#cfunc global WideCharToMultiByte "WideCharToMultiByte" int, int, wstr, int, sptr, int, str, int
; res = WideCharToMultiByte(CodePage, dwFlags, lpWideCharStr, cchWideChar, varptr(lpMultiByteStr), cbMultiByte, lpDefaultChar, lpUsedDefaultChar)
; CodePage : DWORD -> "int"
; dwFlags : DWORD -> "int"
; lpWideCharStr : LPCWSTR -> "wstr"
; cchWideChar : INT -> "int"
; lpMultiByteStr : LPSTR optional, out -> "sptr"
; cbMultiByte : INT -> "int"
; lpDefaultChar : LPCSTR optional -> "str"
; lpUsedDefaultChar : BOOL* optional, out -> "int"
; ※出力/バッファ引数はポインタ方式(token=sptr / 呼び出しは varptr(変数))。

出力引数:

; INT WideCharToMultiByte(DWORD CodePage, DWORD dwFlags, LPCWSTR lpWideCharStr, INT cchWideChar, LPSTR lpMultiByteStr, INT cbMultiByte, LPCSTR lpDefaultChar, BOOL* lpUsedDefaultChar)
#uselib "KERNEL32.dll"
#cfunc global WideCharToMultiByte "WideCharToMultiByte" int, int, wstr, int, var, int, str, int
; res = WideCharToMultiByte(CodePage, dwFlags, lpWideCharStr, cchWideChar, lpMultiByteStr, cbMultiByte, lpDefaultChar, lpUsedDefaultChar)
; CodePage : DWORD -> "int"
; dwFlags : DWORD -> "int"
; lpWideCharStr : LPCWSTR -> "wstr"
; cchWideChar : INT -> "int"
; lpMultiByteStr : LPSTR optional, out -> "var"
; cbMultiByte : INT -> "int"
; lpDefaultChar : LPCSTR optional -> "str"
; lpUsedDefaultChar : BOOL* optional, out -> "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。; INT WideCharToMultiByte(DWORD CodePage, DWORD dwFlags, LPCWSTR lpWideCharStr, INT cchWideChar, LPSTR lpMultiByteStr, INT cbMultiByte, LPCSTR lpDefaultChar, BOOL* lpUsedDefaultChar)
#uselib "KERNEL32.dll"
#cfunc global WideCharToMultiByte "WideCharToMultiByte" int, int, wstr, int, intptr, int, str, int
; res = WideCharToMultiByte(CodePage, dwFlags, lpWideCharStr, cchWideChar, varptr(lpMultiByteStr), cbMultiByte, lpDefaultChar, lpUsedDefaultChar)
; CodePage : DWORD -> "int"
; dwFlags : DWORD -> "int"
; lpWideCharStr : LPCWSTR -> "wstr"
; cchWideChar : INT -> "int"
; lpMultiByteStr : LPSTR optional, out -> "intptr"
; cbMultiByte : INT -> "int"
; lpDefaultChar : LPCSTR optional -> "str"
; lpUsedDefaultChar : BOOL* optional, out -> "int"
; ※出力/バッファ引数はポインタ方式(token=intptr / 呼び出しは varptr(変数))。

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

var (
	kernel32 = windows.NewLazySystemDLL("KERNEL32.dll")
	procWideCharToMultiByte = kernel32.NewProc("WideCharToMultiByte")
)

// CodePage (DWORD), dwFlags (DWORD), lpWideCharStr (LPCWSTR), cchWideChar (INT), lpMultiByteStr (LPSTR optional, out), cbMultiByte (INT), lpDefaultChar (LPCSTR optional), lpUsedDefaultChar (BOOL* optional, out)
r1, _, err := procWideCharToMultiByte.Call(
	uintptr(CodePage),
	uintptr(dwFlags),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(lpWideCharStr))),
	uintptr(cchWideChar),
	uintptr(lpMultiByteStr),
	uintptr(cbMultiByte),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(lpDefaultChar))),
	uintptr(lpUsedDefaultChar),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function WideCharToMultiByte(
  CodePage: DWORD;   // DWORD
  dwFlags: DWORD;   // DWORD
  lpWideCharStr: PWideChar;   // LPCWSTR
  cchWideChar: Integer;   // INT
  lpMultiByteStr: PAnsiChar;   // LPSTR optional, out
  cbMultiByte: Integer;   // INT
  lpDefaultChar: PAnsiChar;   // LPCSTR optional
  lpUsedDefaultChar: Pointer   // BOOL* optional, out
): Integer; stdcall;
  external 'KERNEL32.dll' name 'WideCharToMultiByte';

result := DllCall("KERNEL32\WideCharToMultiByte"
    , "UInt", CodePage   ; DWORD
    , "UInt", dwFlags   ; DWORD
    , "WStr", lpWideCharStr   ; LPCWSTR
    , "Int", cchWideChar   ; INT
    , "Ptr", lpMultiByteStr   ; LPSTR optional, out
    , "Int", cbMultiByte   ; INT
    , "AStr", lpDefaultChar   ; LPCSTR optional
    , "Ptr", lpUsedDefaultChar   ; BOOL* optional, out
    , "Int")   ; return: INT

●WideCharToMultiByte(CodePage, dwFlags, lpWideCharStr, cchWideChar, lpMultiByteStr, cbMultiByte, lpDefaultChar, lpUsedDefaultChar) = DLL("KERNEL32.dll", "int WideCharToMultiByte(dword, dword, char*, int, char*, int, char*, void*)")
# 呼び出し: WideCharToMultiByte(CodePage, dwFlags, lpWideCharStr, cchWideChar, lpMultiByteStr, cbMultiByte, lpDefaultChar, lpUsedDefaultChar)
# CodePage : DWORD -> "dword"
# dwFlags : DWORD -> "dword"
# lpWideCharStr : LPCWSTR -> "char*"
# cchWideChar : INT -> "int"
# lpMultiByteStr : LPSTR optional, out -> "char*"
# cbMultiByte : INT -> "int"
# lpDefaultChar : LPCSTR optional -> "char*"
# lpUsedDefaultChar : BOOL* optional, 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)。