MsiRecordReadStream

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

DWORD MsiRecordReadStream(
    MSIHANDLE hRecord,
    DWORD iField,
    LPSTR szDataBuf,   // optional
    DWORD* pcbDataBuf
);

<DllImport("msi.dll", ExactSpelling:=True)>
Public Shared Function MsiRecordReadStream(
    hRecord As UInteger,   ' MSIHANDLE
    iField As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPStr)> szDataBuf As System.Text.StringBuilder,   ' LPSTR optional, out
    ByRef pcbDataBuf As UInteger   ' DWORD* in/out
) As UInteger
End Function

' hRecord : MSIHANDLE
' iField : DWORD
' szDataBuf : LPSTR optional, out
' pcbDataBuf : DWORD* in/out
Declare PtrSafe Function MsiRecordReadStream Lib "msi" ( _
    ByVal hRecord As Long, _
    ByVal iField As Long, _
    ByVal szDataBuf As String, _
    ByRef pcbDataBuf As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

MsiRecordReadStream = ctypes.windll.msi.MsiRecordReadStream
MsiRecordReadStream.restype = wintypes.DWORD
MsiRecordReadStream.argtypes = [
    wintypes.DWORD,  # hRecord : MSIHANDLE
    wintypes.DWORD,  # iField : DWORD
    wintypes.LPSTR,  # szDataBuf : LPSTR optional, out
    ctypes.POINTER(wintypes.DWORD),  # pcbDataBuf : DWORD* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('msi.dll')
MsiRecordReadStream = Fiddle::Function.new(
  lib['MsiRecordReadStream'],
  [
    -Fiddle::TYPE_INT,  # hRecord : MSIHANDLE
    -Fiddle::TYPE_INT,  # iField : DWORD
    Fiddle::TYPE_VOIDP,  # szDataBuf : LPSTR optional, out
    Fiddle::TYPE_VOIDP,  # pcbDataBuf : DWORD* in/out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "msi")]
extern "system" {
    fn MsiRecordReadStream(
        hRecord: u32,  // MSIHANDLE
        iField: u32,  // DWORD
        szDataBuf: *mut u8,  // LPSTR optional, out
        pcbDataBuf: *mut u32  // DWORD* in/out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("msi.dll")]
public static extern uint MsiRecordReadStream(uint hRecord, uint iField, [MarshalAs(UnmanagedType.LPStr)] System.Text.StringBuilder szDataBuf, ref uint pcbDataBuf);
"@
$api = Add-Type -MemberDefinition $sig -Name 'msi_MsiRecordReadStream' -Namespace Win32 -PassThru
# $api::MsiRecordReadStream(hRecord, iField, szDataBuf, pcbDataBuf)

#uselib "msi.dll"
#func global MsiRecordReadStream "MsiRecordReadStream" sptr, sptr, sptr, sptr
; MsiRecordReadStream hRecord, iField, varptr(szDataBuf), varptr(pcbDataBuf)   ; 戻り値は stat
; hRecord : MSIHANDLE -> "sptr"
; iField : DWORD -> "sptr"
; szDataBuf : LPSTR optional, out -> "sptr"
; pcbDataBuf : DWORD* 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。

#uselib "msi.dll"
#cfunc global MsiRecordReadStream "MsiRecordReadStream" int, int, var, var
; res = MsiRecordReadStream(hRecord, iField, szDataBuf, pcbDataBuf)
; hRecord : MSIHANDLE -> "int"
; iField : DWORD -> "int"
; szDataBuf : LPSTR optional, out -> "var"
; pcbDataBuf : DWORD* 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 MsiRecordReadStream(MSIHANDLE hRecord, DWORD iField, LPSTR szDataBuf, DWORD* pcbDataBuf)
#uselib "msi.dll"
#cfunc global MsiRecordReadStream "MsiRecordReadStream" int, int, var, var
; res = MsiRecordReadStream(hRecord, iField, szDataBuf, pcbDataBuf)
; hRecord : MSIHANDLE -> "int"
; iField : DWORD -> "int"
; szDataBuf : LPSTR optional, out -> "var"
; pcbDataBuf : DWORD* 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")
	procMsiRecordReadStream = msi.NewProc("MsiRecordReadStream")
)

// hRecord (MSIHANDLE), iField (DWORD), szDataBuf (LPSTR optional, out), pcbDataBuf (DWORD* in/out)
r1, _, err := procMsiRecordReadStream.Call(
	uintptr(hRecord),
	uintptr(iField),
	uintptr(szDataBuf),
	uintptr(pcbDataBuf),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function MsiRecordReadStream(
  hRecord: DWORD;   // MSIHANDLE
  iField: DWORD;   // DWORD
  szDataBuf: PAnsiChar;   // LPSTR optional, out
  pcbDataBuf: Pointer   // DWORD* in/out
): DWORD; stdcall;
  external 'msi.dll' name 'MsiRecordReadStream';

result := DllCall("msi\MsiRecordReadStream"
    , "UInt", hRecord   ; MSIHANDLE
    , "UInt", iField   ; DWORD
    , "Ptr", szDataBuf   ; LPSTR optional, out
    , "Ptr", pcbDataBuf   ; DWORD* in/out
    , "UInt")   ; return: DWORD

●MsiRecordReadStream(hRecord, iField, szDataBuf, pcbDataBuf) = DLL("msi.dll", "dword MsiRecordReadStream(dword, dword, char*, void*)")
# 呼び出し: MsiRecordReadStream(hRecord, iField, szDataBuf, pcbDataBuf)
# hRecord : MSIHANDLE -> "dword"
# iField : DWORD -> "dword"
# szDataBuf : LPSTR optional, out -> "char*"
# pcbDataBuf : DWORD* 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)。