IStream_ReadStr

関数

ストリームから文字列を読み取り割り当てて返す。

DLLSHLWAPI.dll呼出規約winapi対応OSWindows Vista 以降

シグネチャ

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

HRESULT IStream_ReadStr(
    IStream* pstm,
    LPWSTR* ppsz
);

パラメーター

名前	型	方向
pstm	IStream*	in
ppsz	LPWSTR*	out

戻り値の型: HRESULT

各言語での呼び出し定義

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

HRESULT IStream_ReadStr(
    IStream* pstm,
    LPWSTR* ppsz
);

[DllImport("SHLWAPI.dll", ExactSpelling = true)]
static extern int IStream_ReadStr(
    IntPtr pstm,   // IStream*
    IntPtr ppsz   // LPWSTR* out
);

<DllImport("SHLWAPI.dll", ExactSpelling:=True)>
Public Shared Function IStream_ReadStr(
    pstm As IntPtr,   ' IStream*
    ppsz As IntPtr   ' LPWSTR* out
) As Integer
End Function

' pstm : IStream*
' ppsz : LPWSTR* out
Declare PtrSafe Function IStream_ReadStr Lib "shlwapi" ( _
    ByVal pstm As LongPtr, _
    ByVal ppsz 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

IStream_ReadStr = ctypes.windll.shlwapi.IStream_ReadStr
IStream_ReadStr.restype = ctypes.c_int
IStream_ReadStr.argtypes = [
    ctypes.c_void_p,  # pstm : IStream*
    ctypes.c_void_p,  # ppsz : LPWSTR* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('SHLWAPI.dll')
IStream_ReadStr = Fiddle::Function.new(
  lib['IStream_ReadStr'],
  [
    Fiddle::TYPE_VOIDP,  # pstm : IStream*
    Fiddle::TYPE_VOIDP,  # ppsz : LPWSTR* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "shlwapi")]
extern "system" {
    fn IStream_ReadStr(
        pstm: *mut core::ffi::c_void,  // IStream*
        ppsz: *mut *mut u16  // LPWSTR* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("SHLWAPI.dll")]
public static extern int IStream_ReadStr(IntPtr pstm, IntPtr ppsz);
"@
$api = Add-Type -MemberDefinition $sig -Name 'SHLWAPI_IStream_ReadStr' -Namespace Win32 -PassThru
# $api::IStream_ReadStr(pstm, ppsz)

#uselib "SHLWAPI.dll"
#func global IStream_ReadStr "IStream_ReadStr" sptr, sptr
; IStream_ReadStr pstm, varptr(ppsz)   ; 戻り値は stat
; pstm : IStream* -> "sptr"
; ppsz : LPWSTR* 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 "SHLWAPI.dll"
#cfunc global IStream_ReadStr "IStream_ReadStr" sptr, var
; res = IStream_ReadStr(pstm, ppsz)
; pstm : IStream* -> "sptr"
; ppsz : LPWSTR* 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。#uselib "SHLWAPI.dll"
#cfunc global IStream_ReadStr "IStream_ReadStr" sptr, sptr
; res = IStream_ReadStr(pstm, varptr(ppsz))
; pstm : IStream* -> "sptr"
; ppsz : LPWSTR* out -> "sptr"
; ※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:

; HRESULT IStream_ReadStr(IStream* pstm, LPWSTR* ppsz)
#uselib "SHLWAPI.dll"
#cfunc global IStream_ReadStr "IStream_ReadStr" intptr, var
; res = IStream_ReadStr(pstm, ppsz)
; pstm : IStream* -> "intptr"
; ppsz : LPWSTR* 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。; HRESULT IStream_ReadStr(IStream* pstm, LPWSTR* ppsz)
#uselib "SHLWAPI.dll"
#cfunc global IStream_ReadStr "IStream_ReadStr" intptr, intptr
; res = IStream_ReadStr(pstm, varptr(ppsz))
; pstm : IStream* -> "intptr"
; ppsz : LPWSTR* out -> "intptr"
; ※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 (
	shlwapi = windows.NewLazySystemDLL("SHLWAPI.dll")
	procIStream_ReadStr = shlwapi.NewProc("IStream_ReadStr")
)

// pstm (IStream*), ppsz (LPWSTR* out)
r1, _, err := procIStream_ReadStr.Call(
	uintptr(pstm),
	uintptr(ppsz),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function IStream_ReadStr(
  pstm: Pointer;   // IStream*
  ppsz: PPWideChar   // LPWSTR* out
): Integer; stdcall;
  external 'SHLWAPI.dll' name 'IStream_ReadStr';

result := DllCall("SHLWAPI\IStream_ReadStr"
    , "Ptr", pstm   ; IStream*
    , "Ptr", ppsz   ; LPWSTR* out
    , "Int")   ; return: HRESULT

●IStream_ReadStr(pstm, ppsz) = DLL("SHLWAPI.dll", "int IStream_ReadStr(void*, void*)")
# 呼び出し: IStream_ReadStr(pstm, ppsz)
# pstm : IStream* -> "void*"
# ppsz : LPWSTR* 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)。