MsiExtractPatchXMLDataW

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

DWORD MsiExtractPatchXMLDataW(
    LPCWSTR szPatchPath,
    DWORD dwReserved,   // optional
    LPWSTR szXMLData,   // optional
    DWORD* pcchXMLData   // optional
);

<DllImport("msi.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function MsiExtractPatchXMLDataW(
    <MarshalAs(UnmanagedType.LPWStr)> szPatchPath As String,   ' LPCWSTR
    dwReserved As UInteger,   ' DWORD optional
    <MarshalAs(UnmanagedType.LPWStr)> szXMLData As System.Text.StringBuilder,   ' LPWSTR optional, out
    pcchXMLData As IntPtr   ' DWORD* optional, in/out
) As UInteger
End Function

' szPatchPath : LPCWSTR
' dwReserved : DWORD optional
' szXMLData : LPWSTR optional, out
' pcchXMLData : DWORD* optional, in/out
Declare PtrSafe Function MsiExtractPatchXMLDataW Lib "msi" ( _
    ByVal szPatchPath As LongPtr, _
    ByVal dwReserved As Long, _
    ByVal szXMLData As LongPtr, _
    ByVal pcchXMLData As LongPtr) 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

MsiExtractPatchXMLDataW = ctypes.windll.msi.MsiExtractPatchXMLDataW
MsiExtractPatchXMLDataW.restype = wintypes.DWORD
MsiExtractPatchXMLDataW.argtypes = [
    wintypes.LPCWSTR,  # szPatchPath : LPCWSTR
    wintypes.DWORD,  # dwReserved : DWORD optional
    wintypes.LPWSTR,  # szXMLData : LPWSTR optional, out
    ctypes.POINTER(wintypes.DWORD),  # pcchXMLData : DWORD* optional, in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('msi.dll')
MsiExtractPatchXMLDataW = Fiddle::Function.new(
  lib['MsiExtractPatchXMLDataW'],
  [
    Fiddle::TYPE_VOIDP,  # szPatchPath : LPCWSTR
    -Fiddle::TYPE_INT,  # dwReserved : DWORD optional
    Fiddle::TYPE_VOIDP,  # szXMLData : LPWSTR optional, out
    Fiddle::TYPE_VOIDP,  # pcchXMLData : DWORD* optional, in/out
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "msi")]
extern "system" {
    fn MsiExtractPatchXMLDataW(
        szPatchPath: *const u16,  // LPCWSTR
        dwReserved: u32,  // DWORD optional
        szXMLData: *mut u16,  // LPWSTR optional, out
        pcchXMLData: *mut u32  // DWORD* optional, in/out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("msi.dll", CharSet = CharSet.Unicode)]
public static extern uint MsiExtractPatchXMLDataW([MarshalAs(UnmanagedType.LPWStr)] string szPatchPath, uint dwReserved, [MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder szXMLData, IntPtr pcchXMLData);
"@
$api = Add-Type -MemberDefinition $sig -Name 'msi_MsiExtractPatchXMLDataW' -Namespace Win32 -PassThru
# $api::MsiExtractPatchXMLDataW(szPatchPath, dwReserved, szXMLData, pcchXMLData)

#uselib "msi.dll"
#func global MsiExtractPatchXMLDataW "MsiExtractPatchXMLDataW" wptr, wptr, wptr, wptr
; MsiExtractPatchXMLDataW szPatchPath, dwReserved, varptr(szXMLData), varptr(pcchXMLData)   ; 戻り値は stat
; szPatchPath : LPCWSTR -> "wptr"
; dwReserved : DWORD optional -> "wptr"
; szXMLData : LPWSTR optional, out -> "wptr"
; pcchXMLData : DWORD* optional, in/out -> "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。

#uselib "msi.dll"
#cfunc global MsiExtractPatchXMLDataW "MsiExtractPatchXMLDataW" wstr, int, var, var
; res = MsiExtractPatchXMLDataW(szPatchPath, dwReserved, szXMLData, pcchXMLData)
; szPatchPath : LPCWSTR -> "wstr"
; dwReserved : DWORD optional -> "int"
; szXMLData : LPWSTR optional, out -> "var"
; pcchXMLData : DWORD* optional, in/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。

; DWORD MsiExtractPatchXMLDataW(LPCWSTR szPatchPath, DWORD dwReserved, LPWSTR szXMLData, DWORD* pcchXMLData)
#uselib "msi.dll"
#cfunc global MsiExtractPatchXMLDataW "MsiExtractPatchXMLDataW" wstr, int, var, var
; res = MsiExtractPatchXMLDataW(szPatchPath, dwReserved, szXMLData, pcchXMLData)
; szPatchPath : LPCWSTR -> "wstr"
; dwReserved : DWORD optional -> "int"
; szXMLData : LPWSTR optional, out -> "var"
; pcchXMLData : DWORD* optional, in/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。

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

var (
	msi = windows.NewLazySystemDLL("msi.dll")
	procMsiExtractPatchXMLDataW = msi.NewProc("MsiExtractPatchXMLDataW")
)

// szPatchPath (LPCWSTR), dwReserved (DWORD optional), szXMLData (LPWSTR optional, out), pcchXMLData (DWORD* optional, in/out)
r1, _, err := procMsiExtractPatchXMLDataW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(szPatchPath))),
	uintptr(dwReserved),
	uintptr(szXMLData),
	uintptr(pcchXMLData),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function MsiExtractPatchXMLDataW(
  szPatchPath: PWideChar;   // LPCWSTR
  dwReserved: DWORD;   // DWORD optional
  szXMLData: PWideChar;   // LPWSTR optional, out
  pcchXMLData: Pointer   // DWORD* optional, in/out
): DWORD; stdcall;
  external 'msi.dll' name 'MsiExtractPatchXMLDataW';

result := DllCall("msi\MsiExtractPatchXMLDataW"
    , "WStr", szPatchPath   ; LPCWSTR
    , "UInt", dwReserved   ; DWORD optional
    , "Ptr", szXMLData   ; LPWSTR optional, out
    , "Ptr", pcchXMLData   ; DWORD* optional, in/out
    , "UInt")   ; return: DWORD

●MsiExtractPatchXMLDataW(szPatchPath, dwReserved, szXMLData, pcchXMLData) = DLL("msi.dll", "dword MsiExtractPatchXMLDataW(char*, dword, char*, void*)")
# 呼び出し: MsiExtractPatchXMLDataW(szPatchPath, dwReserved, szXMLData, pcchXMLData)
# szPatchPath : LPCWSTR -> "char*"
# dwReserved : DWORD optional -> "dword"
# szXMLData : LPWSTR optional, out -> "char*"
# pcchXMLData : DWORD* optional, in/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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。