MsiGetFeatureCostA

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

DWORD MsiGetFeatureCostA(
    MSIHANDLE hInstall,
    LPCSTR szFeature,
    MSICOSTTREE iCostTree,
    INSTALLSTATE iState,
    INT* piCost
);

<DllImport("msi.dll", CharSet:=CharSet.Ansi, ExactSpelling:=True)>
Public Shared Function MsiGetFeatureCostA(
    hInstall As UInteger,   ' MSIHANDLE
    <MarshalAs(UnmanagedType.LPStr)> szFeature As String,   ' LPCSTR
    iCostTree As Integer,   ' MSICOSTTREE
    iState As Integer,   ' INSTALLSTATE
    ByRef piCost As Integer   ' INT* in/out
) As UInteger
End Function

' hInstall : MSIHANDLE
' szFeature : LPCSTR
' iCostTree : MSICOSTTREE
' iState : INSTALLSTATE
' piCost : INT* in/out
Declare PtrSafe Function MsiGetFeatureCostA Lib "msi" ( _
    ByVal hInstall As Long, _
    ByVal szFeature As String, _
    ByVal iCostTree As Long, _
    ByVal iState As Long, _
    ByRef piCost 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

MsiGetFeatureCostA = ctypes.windll.msi.MsiGetFeatureCostA
MsiGetFeatureCostA.restype = wintypes.DWORD
MsiGetFeatureCostA.argtypes = [
    wintypes.DWORD,  # hInstall : MSIHANDLE
    wintypes.LPCSTR,  # szFeature : LPCSTR
    ctypes.c_int,  # iCostTree : MSICOSTTREE
    ctypes.c_int,  # iState : INSTALLSTATE
    ctypes.POINTER(ctypes.c_int),  # piCost : INT* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('msi.dll')
MsiGetFeatureCostA = Fiddle::Function.new(
  lib['MsiGetFeatureCostA'],
  [
    -Fiddle::TYPE_INT,  # hInstall : MSIHANDLE
    Fiddle::TYPE_VOIDP,  # szFeature : LPCSTR
    Fiddle::TYPE_INT,  # iCostTree : MSICOSTTREE
    Fiddle::TYPE_INT,  # iState : INSTALLSTATE
    Fiddle::TYPE_VOIDP,  # piCost : INT* in/out
  ],
  -Fiddle::TYPE_INT)

#[link(name = "msi")]
extern "system" {
    fn MsiGetFeatureCostA(
        hInstall: u32,  // MSIHANDLE
        szFeature: *const u8,  // LPCSTR
        iCostTree: i32,  // MSICOSTTREE
        iState: i32,  // INSTALLSTATE
        piCost: *mut i32  // INT* in/out
    ) -> u32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("msi.dll", CharSet = CharSet.Ansi)]
public static extern uint MsiGetFeatureCostA(uint hInstall, [MarshalAs(UnmanagedType.LPStr)] string szFeature, int iCostTree, int iState, ref int piCost);
"@
$api = Add-Type -MemberDefinition $sig -Name 'msi_MsiGetFeatureCostA' -Namespace Win32 -PassThru
# $api::MsiGetFeatureCostA(hInstall, szFeature, iCostTree, iState, piCost)

#uselib "msi.dll"
#func global MsiGetFeatureCostA "MsiGetFeatureCostA" sptr, sptr, sptr, sptr, sptr
; MsiGetFeatureCostA hInstall, szFeature, iCostTree, iState, varptr(piCost)   ; 戻り値は stat
; hInstall : MSIHANDLE -> "sptr"
; szFeature : LPCSTR -> "sptr"
; iCostTree : MSICOSTTREE -> "sptr"
; iState : INSTALLSTATE -> "sptr"
; piCost : INT* 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 MsiGetFeatureCostA "MsiGetFeatureCostA" int, str, int, int, var
; res = MsiGetFeatureCostA(hInstall, szFeature, iCostTree, iState, piCost)
; hInstall : MSIHANDLE -> "int"
; szFeature : LPCSTR -> "str"
; iCostTree : MSICOSTTREE -> "int"
; iState : INSTALLSTATE -> "int"
; piCost : INT* 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 MsiGetFeatureCostA(MSIHANDLE hInstall, LPCSTR szFeature, MSICOSTTREE iCostTree, INSTALLSTATE iState, INT* piCost)
#uselib "msi.dll"
#cfunc global MsiGetFeatureCostA "MsiGetFeatureCostA" int, str, int, int, var
; res = MsiGetFeatureCostA(hInstall, szFeature, iCostTree, iState, piCost)
; hInstall : MSIHANDLE -> "int"
; szFeature : LPCSTR -> "str"
; iCostTree : MSICOSTTREE -> "int"
; iState : INSTALLSTATE -> "int"
; piCost : INT* 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")
	procMsiGetFeatureCostA = msi.NewProc("MsiGetFeatureCostA")
)

// hInstall (MSIHANDLE), szFeature (LPCSTR), iCostTree (MSICOSTTREE), iState (INSTALLSTATE), piCost (INT* in/out)
r1, _, err := procMsiGetFeatureCostA.Call(
	uintptr(hInstall),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(szFeature))),
	uintptr(iCostTree),
	uintptr(iState),
	uintptr(piCost),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // DWORD

function MsiGetFeatureCostA(
  hInstall: DWORD;   // MSIHANDLE
  szFeature: PAnsiChar;   // LPCSTR
  iCostTree: Integer;   // MSICOSTTREE
  iState: Integer;   // INSTALLSTATE
  piCost: Pointer   // INT* in/out
): DWORD; stdcall;
  external 'msi.dll' name 'MsiGetFeatureCostA';

result := DllCall("msi\MsiGetFeatureCostA"
    , "UInt", hInstall   ; MSIHANDLE
    , "AStr", szFeature   ; LPCSTR
    , "Int", iCostTree   ; MSICOSTTREE
    , "Int", iState   ; INSTALLSTATE
    , "Ptr", piCost   ; INT* in/out
    , "UInt")   ; return: DWORD

●MsiGetFeatureCostA(hInstall, szFeature, iCostTree, iState, piCost) = DLL("msi.dll", "dword MsiGetFeatureCostA(dword, char*, int, int, void*)")
# 呼び出し: MsiGetFeatureCostA(hInstall, szFeature, iCostTree, iState, piCost)
# hInstall : MSIHANDLE -> "dword"
# szFeature : LPCSTR -> "char*"
# iCostTree : MSICOSTTREE -> "int"
# iState : INSTALLSTATE -> "int"
# piCost : INT* 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)。