CoInstall

// ole32.dll
#include <windows.h>

HRESULT CoInstall(
    IBindCtx* pbc,
    DWORD dwFlags,
    uCLSSPEC* pClassSpec,
    QUERYCONTEXT* pQuery,
    LPWSTR pszCodeBase
);

<DllImport("ole32.dll", ExactSpelling:=True)>
Public Shared Function CoInstall(
    pbc As IntPtr,   ' IBindCtx*
    dwFlags As UInteger,   ' DWORD
    pClassSpec As IntPtr,   ' uCLSSPEC*
    pQuery As IntPtr,   ' QUERYCONTEXT*
    <MarshalAs(UnmanagedType.LPWStr)> pszCodeBase As String   ' LPWSTR
) As Integer
End Function

' pbc : IBindCtx*
' dwFlags : DWORD
' pClassSpec : uCLSSPEC*
' pQuery : QUERYCONTEXT*
' pszCodeBase : LPWSTR
Declare PtrSafe Function CoInstall Lib "ole32" ( _
    ByVal pbc As LongPtr, _
    ByVal dwFlags As Long, _
    ByVal pClassSpec As LongPtr, _
    ByVal pQuery As LongPtr, _
    ByVal pszCodeBase 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

CoInstall = ctypes.windll.ole32.CoInstall
CoInstall.restype = ctypes.c_int
CoInstall.argtypes = [
    ctypes.c_void_p,  # pbc : IBindCtx*
    wintypes.DWORD,  # dwFlags : DWORD
    ctypes.c_void_p,  # pClassSpec : uCLSSPEC*
    ctypes.c_void_p,  # pQuery : QUERYCONTEXT*
    wintypes.LPCWSTR,  # pszCodeBase : LPWSTR
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('ole32.dll')
CoInstall = Fiddle::Function.new(
  lib['CoInstall'],
  [
    Fiddle::TYPE_VOIDP,  # pbc : IBindCtx*
    -Fiddle::TYPE_INT,  # dwFlags : DWORD
    Fiddle::TYPE_VOIDP,  # pClassSpec : uCLSSPEC*
    Fiddle::TYPE_VOIDP,  # pQuery : QUERYCONTEXT*
    Fiddle::TYPE_VOIDP,  # pszCodeBase : LPWSTR
  ],
  Fiddle::TYPE_INT)

#[link(name = "ole32")]
extern "system" {
    fn CoInstall(
        pbc: *mut core::ffi::c_void,  // IBindCtx*
        dwFlags: u32,  // DWORD
        pClassSpec: *mut uCLSSPEC,  // uCLSSPEC*
        pQuery: *mut QUERYCONTEXT,  // QUERYCONTEXT*
        pszCodeBase: *mut u16  // LPWSTR
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("ole32.dll")]
public static extern int CoInstall(IntPtr pbc, uint dwFlags, IntPtr pClassSpec, IntPtr pQuery, [MarshalAs(UnmanagedType.LPWStr)] string pszCodeBase);
"@
$api = Add-Type -MemberDefinition $sig -Name 'ole32_CoInstall' -Namespace Win32 -PassThru
# $api::CoInstall(pbc, dwFlags, pClassSpec, pQuery, pszCodeBase)

#uselib "ole32.dll"
#func global CoInstall "CoInstall" sptr, sptr, sptr, sptr, sptr
; CoInstall pbc, dwFlags, varptr(pClassSpec), varptr(pQuery), pszCodeBase   ; 戻り値は stat
; pbc : IBindCtx* -> "sptr"
; dwFlags : DWORD -> "sptr"
; pClassSpec : uCLSSPEC* -> "sptr"
; pQuery : QUERYCONTEXT* -> "sptr"
; pszCodeBase : LPWSTR -> "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 "ole32.dll"
#cfunc global CoInstall "CoInstall" sptr, int, var, var, wstr
; res = CoInstall(pbc, dwFlags, pClassSpec, pQuery, pszCodeBase)
; pbc : IBindCtx* -> "sptr"
; dwFlags : DWORD -> "int"
; pClassSpec : uCLSSPEC* -> "var"
; pQuery : QUERYCONTEXT* -> "var"
; pszCodeBase : LPWSTR -> "wstr"
; ※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。

; HRESULT CoInstall(IBindCtx* pbc, DWORD dwFlags, uCLSSPEC* pClassSpec, QUERYCONTEXT* pQuery, LPWSTR pszCodeBase)
#uselib "ole32.dll"
#cfunc global CoInstall "CoInstall" intptr, int, var, var, wstr
; res = CoInstall(pbc, dwFlags, pClassSpec, pQuery, pszCodeBase)
; pbc : IBindCtx* -> "intptr"
; dwFlags : DWORD -> "int"
; pClassSpec : uCLSSPEC* -> "var"
; pQuery : QUERYCONTEXT* -> "var"
; pszCodeBase : LPWSTR -> "wstr"
; ※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 (
	ole32 = windows.NewLazySystemDLL("ole32.dll")
	procCoInstall = ole32.NewProc("CoInstall")
)

// pbc (IBindCtx*), dwFlags (DWORD), pClassSpec (uCLSSPEC*), pQuery (QUERYCONTEXT*), pszCodeBase (LPWSTR)
r1, _, err := procCoInstall.Call(
	uintptr(pbc),
	uintptr(dwFlags),
	uintptr(pClassSpec),
	uintptr(pQuery),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pszCodeBase))),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function CoInstall(
  pbc: Pointer;   // IBindCtx*
  dwFlags: DWORD;   // DWORD
  pClassSpec: Pointer;   // uCLSSPEC*
  pQuery: Pointer;   // QUERYCONTEXT*
  pszCodeBase: PWideChar   // LPWSTR
): Integer; stdcall;
  external 'ole32.dll' name 'CoInstall';

result := DllCall("ole32\CoInstall"
    , "Ptr", pbc   ; IBindCtx*
    , "UInt", dwFlags   ; DWORD
    , "Ptr", pClassSpec   ; uCLSSPEC*
    , "Ptr", pQuery   ; QUERYCONTEXT*
    , "WStr", pszCodeBase   ; LPWSTR
    , "Int")   ; return: HRESULT

●CoInstall(pbc, dwFlags, pClassSpec, pQuery, pszCodeBase) = DLL("ole32.dll", "int CoInstall(void*, dword, void*, void*, char*)")
# 呼び出し: CoInstall(pbc, dwFlags, pClassSpec, pQuery, pszCodeBase)
# pbc : IBindCtx* -> "void*"
# dwFlags : DWORD -> "dword"
# pClassSpec : uCLSSPEC* -> "void*"
# pQuery : QUERYCONTEXT* -> "void*"
# pszCodeBase : LPWSTR -> "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)。