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mciGetErrorStringW

関数

MCIエラーコードに対応する説明文字列を取得する(Unicode版)。

DLLWINMM.dll文字セットUnicode (-W)呼出規約winapi

シグネチャ

// WINMM.dll  (Unicode / -W)
#include <windows.h>

BOOL mciGetErrorStringW(
    DWORD mcierr,
    LPWSTR pszText,
    DWORD cchText
);

パラメーター

名前	型	方向
mcierr	DWORD	in
pszText	LPWSTR	out
cchText	DWORD	in

戻り値の型: BOOL

各言語での呼び出し定義

// WINMM.dll  (Unicode / -W)
#include <windows.h>

BOOL mciGetErrorStringW(
    DWORD mcierr,
    LPWSTR pszText,
    DWORD cchText
);

[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("WINMM.dll", CharSet = CharSet.Unicode, ExactSpelling = true)]
static extern bool mciGetErrorStringW(
    uint mcierr,   // DWORD
    [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder pszText,   // LPWSTR out
    uint cchText   // DWORD
);

<DllImport("WINMM.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function mciGetErrorStringW(
    mcierr As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPWStr)> pszText As System.Text.StringBuilder,   ' LPWSTR out
    cchText As UInteger   ' DWORD
) As Boolean
End Function

' mcierr : DWORD
' pszText : LPWSTR out
' cchText : DWORD
Declare PtrSafe Function mciGetErrorStringW Lib "winmm" ( _
    ByVal mcierr As Long, _
    ByVal pszText As LongPtr, _
    ByVal cchText As Long) As Long
' Unicode(W): 文字列は ByVal As LongPtr とし StrPtr(unicodeStr) を渡す
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

mciGetErrorStringW = ctypes.windll.winmm.mciGetErrorStringW
mciGetErrorStringW.restype = wintypes.BOOL
mciGetErrorStringW.argtypes = [
    wintypes.DWORD,  # mcierr : DWORD
    wintypes.LPWSTR,  # pszText : LPWSTR out
    wintypes.DWORD,  # cchText : DWORD
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WINMM.dll')
mciGetErrorStringW = Fiddle::Function.new(
  lib['mciGetErrorStringW'],
  [
    -Fiddle::TYPE_INT,  # mcierr : DWORD
    Fiddle::TYPE_VOIDP,  # pszText : LPWSTR out
    -Fiddle::TYPE_INT,  # cchText : DWORD
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "winmm")]
extern "system" {
    fn mciGetErrorStringW(
        mcierr: u32,  // DWORD
        pszText: *mut u16,  // LPWSTR out
        cchText: u32  // DWORD
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("WINMM.dll", CharSet = CharSet.Unicode)]
public static extern bool mciGetErrorStringW(uint mcierr, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder pszText, uint cchText);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WINMM_mciGetErrorStringW' -Namespace Win32 -PassThru
# $api::mciGetErrorStringW(mcierr, pszText, cchText)

#uselib "WINMM.dll"
#func global mciGetErrorStringW "mciGetErrorStringW" wptr, wptr, wptr
; mciGetErrorStringW mcierr, varptr(pszText), cchText   ; 戻り値は stat
; mcierr : DWORD -> "wptr"
; pszText : LPWSTR out -> "wptr"
; cchText : DWORD -> "wptr"
; ※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 "WINMM.dll"
#cfunc global mciGetErrorStringW "mciGetErrorStringW" int, var, int
; res = mciGetErrorStringW(mcierr, pszText, cchText)
; mcierr : DWORD -> "int"
; pszText : LPWSTR out -> "var"
; cchText : DWORD -> "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 "WINMM.dll"
#cfunc global mciGetErrorStringW "mciGetErrorStringW" int, sptr, int
; res = mciGetErrorStringW(mcierr, varptr(pszText), cchText)
; mcierr : DWORD -> "int"
; pszText : LPWSTR out -> "sptr"
; cchText : DWORD -> "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:

; BOOL mciGetErrorStringW(DWORD mcierr, LPWSTR pszText, DWORD cchText)
#uselib "WINMM.dll"
#cfunc global mciGetErrorStringW "mciGetErrorStringW" int, var, int
; res = mciGetErrorStringW(mcierr, pszText, cchText)
; mcierr : DWORD -> "int"
; pszText : LPWSTR out -> "var"
; cchText : DWORD -> "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。; BOOL mciGetErrorStringW(DWORD mcierr, LPWSTR pszText, DWORD cchText)
#uselib "WINMM.dll"
#cfunc global mciGetErrorStringW "mciGetErrorStringW" int, intptr, int
; res = mciGetErrorStringW(mcierr, varptr(pszText), cchText)
; mcierr : DWORD -> "int"
; pszText : LPWSTR out -> "intptr"
; cchText : DWORD -> "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 (
	winmm = windows.NewLazySystemDLL("WINMM.dll")
	procmciGetErrorStringW = winmm.NewProc("mciGetErrorStringW")
)

// mcierr (DWORD), pszText (LPWSTR out), cchText (DWORD)
r1, _, err := procmciGetErrorStringW.Call(
	uintptr(mcierr),
	uintptr(pszText),
	uintptr(cchText),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function mciGetErrorStringW(
  mcierr: DWORD;   // DWORD
  pszText: PWideChar;   // LPWSTR out
  cchText: DWORD   // DWORD
): BOOL; stdcall;
  external 'WINMM.dll' name 'mciGetErrorStringW';

result := DllCall("WINMM\mciGetErrorStringW"
    , "UInt", mcierr   ; DWORD
    , "Ptr", pszText   ; LPWSTR out
    , "UInt", cchText   ; DWORD
    , "Int")   ; return: BOOL

●mciGetErrorStringW(mcierr, pszText, cchText) = DLL("WINMM.dll", "bool mciGetErrorStringW(dword, char*, dword)")
# 呼び出し: mciGetErrorStringW(mcierr, pszText, cchText)
# mcierr : DWORD -> "dword"
# pszText : LPWSTR out -> "char*"
# cchText : DWORD -> "dword"
# 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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。