MsiGetProductInfoA

// msi.dll  (ANSI / -A)
#include <windows.h>

DWORD MsiGetProductInfoA(
    LPCSTR szProduct,
    LPCSTR szAttribute,
    LPSTR lpValueBuf,   // optional
    DWORD* pcchValueBuf   // optional
);

<DllImport("msi.dll", CharSet:=CharSet.Ansi, ExactSpelling:=True)>
Public Shared Function MsiGetProductInfoA(
    <MarshalAs(UnmanagedType.LPStr)> szProduct As String,   ' LPCSTR
    <MarshalAs(UnmanagedType.LPStr)> szAttribute As String,   ' LPCSTR
    <MarshalAs(UnmanagedType.LPStr)> lpValueBuf As System.Text.StringBuilder,   ' LPSTR optional, out
    pcchValueBuf As IntPtr   ' DWORD* optional, in/out
) As UInteger
End Function

' szProduct : LPCSTR
' szAttribute : LPCSTR
' lpValueBuf : LPSTR optional, out
' pcchValueBuf : DWORD* optional, in/out
Declare PtrSafe Function MsiGetProductInfoA Lib "msi" ( _
    ByVal szProduct As String, _
    ByVal szAttribute As String, _
    ByVal lpValueBuf As String, _
    ByVal pcchValueBuf 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

MsiGetProductInfoA = ctypes.windll.msi.MsiGetProductInfoA
MsiGetProductInfoA.restype = wintypes.DWORD
MsiGetProductInfoA.argtypes = [
    wintypes.LPCSTR,  # szProduct : LPCSTR
    wintypes.LPCSTR,  # szAttribute : LPCSTR
    wintypes.LPSTR,  # lpValueBuf : LPSTR optional, out
    ctypes.POINTER(wintypes.DWORD),  # pcchValueBuf : DWORD* optional, in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('msi.dll')
MsiGetProductInfoA = Fiddle::Function.new(
  lib['MsiGetProductInfoA'],
  [
    Fiddle::TYPE_VOIDP,  # szProduct : LPCSTR
    Fiddle::TYPE_VOIDP,  # szAttribute : LPCSTR
    Fiddle::TYPE_VOIDP,  # lpValueBuf : LPSTR optional, out
    Fiddle::TYPE_VOIDP,  # pcchValueBuf : DWORD* optional, in/out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "msi")]
extern "system" {
    fn MsiGetProductInfoA(
        szProduct: *const u8,  // LPCSTR
        szAttribute: *const u8,  // LPCSTR
        lpValueBuf: *mut u8,  // LPSTR optional, out
        pcchValueBuf: *mut u32  // DWORD* optional, in/out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("msi.dll", CharSet = CharSet.Ansi)]
public static extern uint MsiGetProductInfoA([MarshalAs(UnmanagedType.LPStr)] string szProduct, [MarshalAs(UnmanagedType.LPStr)] string szAttribute, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder lpValueBuf, IntPtr pcchValueBuf);
"@
$api = Add-Type -MemberDefinition $sig -Name 'msi_MsiGetProductInfoA' -Namespace Win32 -PassThru
# $api::MsiGetProductInfoA(szProduct, szAttribute, lpValueBuf, pcchValueBuf)

#uselib "msi.dll"
#func global MsiGetProductInfoA "MsiGetProductInfoA" sptr, sptr, sptr, sptr
; MsiGetProductInfoA szProduct, szAttribute, varptr(lpValueBuf), varptr(pcchValueBuf)   ; 戻り値は stat
; szProduct : LPCSTR -> "sptr"
; szAttribute : LPCSTR -> "sptr"
; lpValueBuf : LPSTR optional, out -> "sptr"
; pcchValueBuf : DWORD* optional, in/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。

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

var (
	msi = windows.NewLazySystemDLL("msi.dll")
	procMsiGetProductInfoA = msi.NewProc("MsiGetProductInfoA")
)

// szProduct (LPCSTR), szAttribute (LPCSTR), lpValueBuf (LPSTR optional, out), pcchValueBuf (DWORD* optional, in/out)
r1, _, err := procMsiGetProductInfoA.Call(
	uintptr(unsafe.Pointer(windows.BytePtrFromString(szProduct))),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(szAttribute))),
	uintptr(lpValueBuf),
	uintptr(pcchValueBuf),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function MsiGetProductInfoA(
  szProduct: PAnsiChar;   // LPCSTR
  szAttribute: PAnsiChar;   // LPCSTR
  lpValueBuf: PAnsiChar;   // LPSTR optional, out
  pcchValueBuf: Pointer   // DWORD* optional, in/out
): DWORD; stdcall;
  external 'msi.dll' name 'MsiGetProductInfoA';

result := DllCall("msi\MsiGetProductInfoA"
    , "AStr", szProduct   ; LPCSTR
    , "AStr", szAttribute   ; LPCSTR
    , "Ptr", lpValueBuf   ; LPSTR optional, out
    , "Ptr", pcchValueBuf   ; DWORD* optional, in/out
    , "UInt")   ; return: DWORD

●MsiGetProductInfoA(szProduct, szAttribute, lpValueBuf, pcchValueBuf) = DLL("msi.dll", "dword MsiGetProductInfoA(char*, char*, char*, void*)")
# 呼び出し: MsiGetProductInfoA(szProduct, szAttribute, lpValueBuf, pcchValueBuf)
# szProduct : LPCSTR -> "char*"
# szAttribute : LPCSTR -> "char*"
# lpValueBuf : LPSTR optional, out -> "char*"
# pcchValueBuf : 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)。

const std = @import("std");

extern "msi" fn MsiGetProductInfoA(
    szProduct: [*c]const u8, // LPCSTR
    szAttribute: [*c]const u8, // LPCSTR
    lpValueBuf: [*c]u8, // LPSTR optional, out
    pcchValueBuf: [*c]u32 // DWORD* optional, in/out
) callconv(std.os.windows.WINAPI) u32;

proc MsiGetProductInfoA(
    szProduct: cstring,  # LPCSTR
    szAttribute: cstring,  # LPCSTR
    lpValueBuf: ptr char,  # LPSTR optional, out
    pcchValueBuf: ptr uint32  # DWORD* optional, in/out
): uint32 {.importc: "MsiGetProductInfoA", stdcall, dynlib: "msi.dll".}

pragma(lib, "msi");
extern(Windows)
uint MsiGetProductInfoA(
    const(char)* szProduct,   // LPCSTR
    const(char)* szAttribute,   // LPCSTR
    char* lpValueBuf,   // LPSTR optional, out
    uint* pcchValueBuf   // DWORD* optional, in/out
);

ccall((:MsiGetProductInfoA, "msi.dll"), stdcall, UInt32,
      (Cstring, Cstring, Ptr{UInt8}, Ptr{UInt32}),
      szProduct, szAttribute, lpValueBuf, pcchValueBuf)
# szProduct : LPCSTR -> Cstring
# szAttribute : LPCSTR -> Cstring
# lpValueBuf : LPSTR optional, out -> Ptr{UInt8}
# pcchValueBuf : DWORD* optional, in/out -> Ptr{UInt32}
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
uint32_t MsiGetProductInfoA(
    const char* szProduct,
    const char* szAttribute,
    char* lpValueBuf,
    uint32_t* pcchValueBuf);
]]
local msi = ffi.load("msi")
-- msi.MsiGetProductInfoA(szProduct, szAttribute, lpValueBuf, pcchValueBuf)
-- szProduct : LPCSTR
-- szAttribute : LPCSTR
-- lpValueBuf : LPSTR optional, out
-- pcchValueBuf : DWORD* optional, in/out
-- 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。

const koffi = require('koffi');
const lib = koffi.load('msi.dll');
const MsiGetProductInfoA = lib.func('__stdcall', 'MsiGetProductInfoA', 'uint32_t', ['str', 'str', 'char *', 'uint32_t *']);
// MsiGetProductInfoA(szProduct, szAttribute, lpValueBuf, pcchValueBuf)
// szProduct : LPCSTR -> 'str'
// szAttribute : LPCSTR -> 'str'
// lpValueBuf : LPSTR optional, out -> 'char *'
// pcchValueBuf : DWORD* optional, in/out -> 'uint32_t *'
// 出力ポインタは koffi.out(...) で包む。構造体は koffi.struct で定義。

const lib = Deno.dlopen("msi.dll", {
  MsiGetProductInfoA: { parameters: ["buffer", "buffer", "buffer", "pointer"], result: "u32" },
});
// lib.symbols.MsiGetProductInfoA(szProduct, szAttribute, lpValueBuf, pcchValueBuf)
// szProduct : LPCSTR -> "buffer"
// szAttribute : LPCSTR -> "buffer"
// lpValueBuf : LPSTR optional, out -> "buffer"
// pcchValueBuf : DWORD* optional, in/out -> "pointer"
// 文字列は "buffer"。ANSI(-A) は new TextEncoder() で UTF-8/ANSI バイト列(末尾に \x00)を渡す。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
uint32_t MsiGetProductInfoA(
    const char* szProduct,
    const char* szAttribute,
    char* lpValueBuf,
    uint32_t* pcchValueBuf);
C, "msi.dll");
// $ffi->MsiGetProductInfoA(szProduct, szAttribute, lpValueBuf, pcchValueBuf);
// szProduct : LPCSTR
// szAttribute : LPCSTR
// lpValueBuf : LPSTR optional, out
// pcchValueBuf : DWORD* optional, in/out
// 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。
// WINAPI(stdcall): x64 では呼出規約が統一されるため問題なし。x86 では __stdcall 対応のラッパが必要な場合あり。

import com.sun.jna.*;
import com.sun.jna.ptr.*;
import com.sun.jna.win32.StdCallLibrary;
import com.sun.jna.win32.W32APIOptions;

public interface Msi extends StdCallLibrary {
    Msi INSTANCE = Native.load("msi", Msi.class, W32APIOptions.ASCII_OPTIONS);
    int MsiGetProductInfoA(
        String szProduct,   // LPCSTR
        String szAttribute,   // LPCSTR
        byte[] lpValueBuf,   // LPSTR optional, out
        IntByReference pcchValueBuf   // DWORD* optional, in/out
    );
}

@[Link("msi")]
lib Libmsi
  fun MsiGetProductInfoA = MsiGetProductInfoA(
    szProduct : UInt8*,   # LPCSTR
    szAttribute : UInt8*,   # LPCSTR
    lpValueBuf : UInt8*,   # LPSTR optional, out
    pcchValueBuf : UInt32*   # DWORD* optional, in/out
  ) : UInt32
end
# 構造体/GUID/enum は lib 内に対応する型定義が必要。
# 呼出規約: x64 は規約統一のため OK。x86(32bit)は WINAPI=stdcall だが Crystal の fun に stdcall 付与構文がなく非対応。

import 'dart:ffi';
import 'package:ffi/ffi.dart';

typedef MsiGetProductInfoANative = Uint32 Function(Pointer<Utf8>, Pointer<Utf8>, Pointer<Utf8>, Pointer<Uint32>);
typedef MsiGetProductInfoADart = int Function(Pointer<Utf8>, Pointer<Utf8>, Pointer<Utf8>, Pointer<Uint32>);
final MsiGetProductInfoA = DynamicLibrary.open('msi.dll')
    .lookupFunction<MsiGetProductInfoANative, MsiGetProductInfoADart>('MsiGetProductInfoA');
// szProduct : LPCSTR -> Pointer<Utf8>
// szAttribute : LPCSTR -> Pointer<Utf8>
// lpValueBuf : LPSTR optional, out -> Pointer<Utf8>
// pcchValueBuf : DWORD* optional, in/out -> Pointer<Uint32>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function MsiGetProductInfoA(
  szProduct: PAnsiChar;   // LPCSTR
  szAttribute: PAnsiChar;   // LPCSTR
  lpValueBuf: PAnsiChar;   // LPSTR optional, out
  pcchValueBuf: Pointer   // DWORD* optional, in/out
): DWORD; stdcall;
  external 'msi.dll' name 'MsiGetProductInfoA';

import Foreign
import Foreign.C.Types
import Foreign.C.String

foreign import stdcall safe "MsiGetProductInfoA"
  c_MsiGetProductInfoA :: CString -> CString -> CString -> Ptr Word32 -> IO Word32
-- szProduct : LPCSTR -> CString
-- szAttribute : LPCSTR -> CString
-- lpValueBuf : LPSTR optional, out -> CString
-- pcchValueBuf : DWORD* optional, in/out -> Ptr Word32
-- 要 GHC(Windows)。stdcall は x64 では ccall として扱われる。ブロックする API は safe 呼び出し推奨。

open Ctypes
open Foreign

let msigetproductinfoa =
  foreign "MsiGetProductInfoA"
    (string @-> string @-> string @-> (ptr uint32_t) @-> returning uint32_t)
(* szProduct : LPCSTR -> string *)
(* szAttribute : LPCSTR -> string *)
(* lpValueBuf : LPSTR optional, out -> string *)
(* pcchValueBuf : DWORD* optional, in/out -> (ptr uint32_t) *)
(* foreign は cdecl 前提。x64 Windows では WINAPI と一致。構造体は ctypes structure を定義のこと。 *)

(cffi:define-foreign-library msi (t "msi.dll"))
(cffi:use-foreign-library msi)

(cffi:defcfun ("MsiGetProductInfoA" msi-get-product-info-a :convention :stdcall) :uint32
  (sz-product :string)   ; LPCSTR
  (sz-attribute :string)   ; LPCSTR
  (lp-value-buf :pointer)   ; LPSTR optional, out
  (pcch-value-buf :pointer))   ; DWORD* optional, in/out
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $MsiGetProductInfoA = Win32::API::More->new('msi',
    'DWORD MsiGetProductInfoA(LPCSTR szProduct, LPCSTR szAttribute, LPSTR lpValueBuf, LPVOID pcchValueBuf)');
# my $ret = $MsiGetProductInfoA->Call($szProduct, $szAttribute, $lpValueBuf, $pcchValueBuf);
# szProduct : LPCSTR -> LPCSTR
# szAttribute : LPCSTR -> LPCSTR
# lpValueBuf : LPSTR optional, out -> LPSTR
# pcchValueBuf : DWORD* optional, in/out -> LPVOID
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。