MsiApplyPatchW

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

DWORD MsiApplyPatchW(
    LPCWSTR szPatchPackage,
    LPCWSTR szInstallPackage,   // optional
    INSTALLTYPE eInstallType,
    LPCWSTR szCommandLine   // optional
);

<DllImport("msi.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function MsiApplyPatchW(
    <MarshalAs(UnmanagedType.LPWStr)> szPatchPackage As String,   ' LPCWSTR
    <MarshalAs(UnmanagedType.LPWStr)> szInstallPackage As String,   ' LPCWSTR optional
    eInstallType As Integer,   ' INSTALLTYPE
    <MarshalAs(UnmanagedType.LPWStr)> szCommandLine As String   ' LPCWSTR optional
) As UInteger
End Function

' szPatchPackage : LPCWSTR
' szInstallPackage : LPCWSTR optional
' eInstallType : INSTALLTYPE
' szCommandLine : LPCWSTR optional
Declare PtrSafe Function MsiApplyPatchW Lib "msi" ( _
    ByVal szPatchPackage As LongPtr, _
    ByVal szInstallPackage As LongPtr, _
    ByVal eInstallType As Long, _
    ByVal szCommandLine 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

MsiApplyPatchW = ctypes.windll.msi.MsiApplyPatchW
MsiApplyPatchW.restype = wintypes.DWORD
MsiApplyPatchW.argtypes = [
    wintypes.LPCWSTR,  # szPatchPackage : LPCWSTR
    wintypes.LPCWSTR,  # szInstallPackage : LPCWSTR optional
    ctypes.c_int,  # eInstallType : INSTALLTYPE
    wintypes.LPCWSTR,  # szCommandLine : LPCWSTR optional
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('msi.dll')
MsiApplyPatchW = Fiddle::Function.new(
  lib['MsiApplyPatchW'],
  [
    Fiddle::TYPE_VOIDP,  # szPatchPackage : LPCWSTR
    Fiddle::TYPE_VOIDP,  # szInstallPackage : LPCWSTR optional
    Fiddle::TYPE_INT,  # eInstallType : INSTALLTYPE
    Fiddle::TYPE_VOIDP,  # szCommandLine : LPCWSTR optional
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "msi")]
extern "system" {
    fn MsiApplyPatchW(
        szPatchPackage: *const u16,  // LPCWSTR
        szInstallPackage: *const u16,  // LPCWSTR optional
        eInstallType: i32,  // INSTALLTYPE
        szCommandLine: *const u16  // LPCWSTR optional
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("msi.dll", CharSet = CharSet.Unicode)]
public static extern uint MsiApplyPatchW([MarshalAs(UnmanagedType.LPWStr)] string szPatchPackage, [MarshalAs(UnmanagedType.LPWStr)] string szInstallPackage, int eInstallType, [MarshalAs(UnmanagedType.LPWStr)] string szCommandLine);
"@
$api = Add-Type -MemberDefinition $sig -Name 'msi_MsiApplyPatchW' -Namespace Win32 -PassThru
# $api::MsiApplyPatchW(szPatchPackage, szInstallPackage, eInstallType, szCommandLine)

#uselib "msi.dll"
#func global MsiApplyPatchW "MsiApplyPatchW" wptr, wptr, wptr, wptr
; MsiApplyPatchW szPatchPackage, szInstallPackage, eInstallType, szCommandLine   ; 戻り値は stat
; szPatchPackage : LPCWSTR -> "wptr"
; szInstallPackage : LPCWSTR optional -> "wptr"
; eInstallType : INSTALLTYPE -> "wptr"
; szCommandLine : LPCWSTR optional -> "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 MsiApplyPatchW "MsiApplyPatchW" wstr, wstr, int, wstr
; res = MsiApplyPatchW(szPatchPackage, szInstallPackage, eInstallType, szCommandLine)
; szPatchPackage : LPCWSTR -> "wstr"
; szInstallPackage : LPCWSTR optional -> "wstr"
; eInstallType : INSTALLTYPE -> "int"
; szCommandLine : LPCWSTR optional -> "wstr"

; DWORD MsiApplyPatchW(LPCWSTR szPatchPackage, LPCWSTR szInstallPackage, INSTALLTYPE eInstallType, LPCWSTR szCommandLine)
#uselib "msi.dll"
#cfunc global MsiApplyPatchW "MsiApplyPatchW" wstr, wstr, int, wstr
; res = MsiApplyPatchW(szPatchPackage, szInstallPackage, eInstallType, szCommandLine)
; szPatchPackage : LPCWSTR -> "wstr"
; szInstallPackage : LPCWSTR optional -> "wstr"
; eInstallType : INSTALLTYPE -> "int"
; szCommandLine : LPCWSTR optional -> "wstr"

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

var (
	msi = windows.NewLazySystemDLL("msi.dll")
	procMsiApplyPatchW = msi.NewProc("MsiApplyPatchW")
)

// szPatchPackage (LPCWSTR), szInstallPackage (LPCWSTR optional), eInstallType (INSTALLTYPE), szCommandLine (LPCWSTR optional)
r1, _, err := procMsiApplyPatchW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(szPatchPackage))),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(szInstallPackage))),
	uintptr(eInstallType),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(szCommandLine))),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function MsiApplyPatchW(
  szPatchPackage: PWideChar;   // LPCWSTR
  szInstallPackage: PWideChar;   // LPCWSTR optional
  eInstallType: Integer;   // INSTALLTYPE
  szCommandLine: PWideChar   // LPCWSTR optional
): DWORD; stdcall;
  external 'msi.dll' name 'MsiApplyPatchW';

result := DllCall("msi\MsiApplyPatchW"
    , "WStr", szPatchPackage   ; LPCWSTR
    , "WStr", szInstallPackage   ; LPCWSTR optional
    , "Int", eInstallType   ; INSTALLTYPE
    , "WStr", szCommandLine   ; LPCWSTR optional
    , "UInt")   ; return: DWORD

●MsiApplyPatchW(szPatchPackage, szInstallPackage, eInstallType, szCommandLine) = DLL("msi.dll", "dword MsiApplyPatchW(char*, char*, int, char*)")
# 呼び出し: MsiApplyPatchW(szPatchPackage, szInstallPackage, eInstallType, szCommandLine)
# szPatchPackage : LPCWSTR -> "char*"
# szInstallPackage : LPCWSTR optional -> "char*"
# eInstallType : INSTALLTYPE -> "int"
# szCommandLine : LPCWSTR optional -> "char*"
# 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。