MsiInstallMissingComponentW

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

DWORD MsiInstallMissingComponentW(
    LPCWSTR szProduct,
    LPCWSTR szComponent,
    INSTALLSTATE eInstallState
);

<DllImport("msi.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function MsiInstallMissingComponentW(
    <MarshalAs(UnmanagedType.LPWStr)> szProduct As String,   ' LPCWSTR
    <MarshalAs(UnmanagedType.LPWStr)> szComponent As String,   ' LPCWSTR
    eInstallState As Integer   ' INSTALLSTATE
) As UInteger
End Function

' szProduct : LPCWSTR
' szComponent : LPCWSTR
' eInstallState : INSTALLSTATE
Declare PtrSafe Function MsiInstallMissingComponentW Lib "msi" ( _
    ByVal szProduct As LongPtr, _
    ByVal szComponent As LongPtr, _
    ByVal eInstallState 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

MsiInstallMissingComponentW = ctypes.windll.msi.MsiInstallMissingComponentW
MsiInstallMissingComponentW.restype = wintypes.DWORD
MsiInstallMissingComponentW.argtypes = [
    wintypes.LPCWSTR,  # szProduct : LPCWSTR
    wintypes.LPCWSTR,  # szComponent : LPCWSTR
    ctypes.c_int,  # eInstallState : INSTALLSTATE
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('msi.dll')
MsiInstallMissingComponentW = Fiddle::Function.new(
  lib['MsiInstallMissingComponentW'],
  [
    Fiddle::TYPE_VOIDP,  # szProduct : LPCWSTR
    Fiddle::TYPE_VOIDP,  # szComponent : LPCWSTR
    Fiddle::TYPE_INT,  # eInstallState : INSTALLSTATE
  ],
  -Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "msi")]
extern "system" {
    fn MsiInstallMissingComponentW(
        szProduct: *const u16,  // LPCWSTR
        szComponent: *const u16,  // LPCWSTR
        eInstallState: i32  // INSTALLSTATE
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("msi.dll", CharSet = CharSet.Unicode)]
public static extern uint MsiInstallMissingComponentW([MarshalAs(UnmanagedType.LPWStr)] string szProduct, [MarshalAs(UnmanagedType.LPWStr)] string szComponent, int eInstallState);
"@
$api = Add-Type -MemberDefinition $sig -Name 'msi_MsiInstallMissingComponentW' -Namespace Win32 -PassThru
# $api::MsiInstallMissingComponentW(szProduct, szComponent, eInstallState)

#uselib "msi.dll"
#func global MsiInstallMissingComponentW "MsiInstallMissingComponentW" wptr, wptr, wptr
; MsiInstallMissingComponentW szProduct, szComponent, eInstallState   ; 戻り値は stat
; szProduct : LPCWSTR -> "wptr"
; szComponent : LPCWSTR -> "wptr"
; eInstallState : INSTALLSTATE -> "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 MsiInstallMissingComponentW "MsiInstallMissingComponentW" wstr, wstr, int
; res = MsiInstallMissingComponentW(szProduct, szComponent, eInstallState)
; szProduct : LPCWSTR -> "wstr"
; szComponent : LPCWSTR -> "wstr"
; eInstallState : INSTALLSTATE -> "int"

; DWORD MsiInstallMissingComponentW(LPCWSTR szProduct, LPCWSTR szComponent, INSTALLSTATE eInstallState)
#uselib "msi.dll"
#cfunc global MsiInstallMissingComponentW "MsiInstallMissingComponentW" wstr, wstr, int
; res = MsiInstallMissingComponentW(szProduct, szComponent, eInstallState)
; szProduct : LPCWSTR -> "wstr"
; szComponent : LPCWSTR -> "wstr"
; eInstallState : INSTALLSTATE -> "int"

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

var (
	msi = windows.NewLazySystemDLL("msi.dll")
	procMsiInstallMissingComponentW = msi.NewProc("MsiInstallMissingComponentW")
)

// szProduct (LPCWSTR), szComponent (LPCWSTR), eInstallState (INSTALLSTATE)
r1, _, err := procMsiInstallMissingComponentW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(szProduct))),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(szComponent))),
	uintptr(eInstallState),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function MsiInstallMissingComponentW(
  szProduct: PWideChar;   // LPCWSTR
  szComponent: PWideChar;   // LPCWSTR
  eInstallState: Integer   // INSTALLSTATE
): DWORD; stdcall;
  external 'msi.dll' name 'MsiInstallMissingComponentW';

result := DllCall("msi\MsiInstallMissingComponentW"
    , "WStr", szProduct   ; LPCWSTR
    , "WStr", szComponent   ; LPCWSTR
    , "Int", eInstallState   ; INSTALLSTATE
    , "UInt")   ; return: DWORD

●MsiInstallMissingComponentW(szProduct, szComponent, eInstallState) = DLL("msi.dll", "dword MsiInstallMissingComponentW(char*, char*, int)")
# 呼び出し: MsiInstallMissingComponentW(szProduct, szComponent, eInstallState)
# szProduct : LPCWSTR -> "char*"
# szComponent : LPCWSTR -> "char*"
# eInstallState : INSTALLSTATE -> "int"
# 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。