ScCountNotifications

// MAPI32.dll
#include <windows.h>

INT ScCountNotifications(
    INT cNotifications,
    NOTIFICATION* lpNotifications,
    DWORD* lpcb
);

<DllImport("MAPI32.dll", ExactSpelling:=True)>
Public Shared Function ScCountNotifications(
    cNotifications As Integer,   ' INT
    lpNotifications As IntPtr,   ' NOTIFICATION* in/out
    ByRef lpcb As UInteger   ' DWORD* in/out
) As Integer
End Function

' cNotifications : INT
' lpNotifications : NOTIFICATION* in/out
' lpcb : DWORD* in/out
Declare PtrSafe Function ScCountNotifications Lib "mapi32" ( _
    ByVal cNotifications As Long, _
    ByVal lpNotifications As LongPtr, _
    ByRef lpcb 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

ScCountNotifications = ctypes.windll.mapi32.ScCountNotifications
ScCountNotifications.restype = ctypes.c_int
ScCountNotifications.argtypes = [
    ctypes.c_int,  # cNotifications : INT
    ctypes.c_void_p,  # lpNotifications : NOTIFICATION* in/out
    ctypes.POINTER(wintypes.DWORD),  # lpcb : DWORD* in/out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('MAPI32.dll')
ScCountNotifications = Fiddle::Function.new(
  lib['ScCountNotifications'],
  [
    Fiddle::TYPE_INT,  # cNotifications : INT
    Fiddle::TYPE_VOIDP,  # lpNotifications : NOTIFICATION* in/out
    Fiddle::TYPE_VOIDP,  # lpcb : DWORD* in/out
  ],
  Fiddle::TYPE_INT)

#[link(name = "mapi32")]
extern "system" {
    fn ScCountNotifications(
        cNotifications: i32,  // INT
        lpNotifications: *mut NOTIFICATION,  // NOTIFICATION* in/out
        lpcb: *mut u32  // DWORD* in/out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("MAPI32.dll")]
public static extern int ScCountNotifications(int cNotifications, IntPtr lpNotifications, ref uint lpcb);
"@
$api = Add-Type -MemberDefinition $sig -Name 'MAPI32_ScCountNotifications' -Namespace Win32 -PassThru
# $api::ScCountNotifications(cNotifications, lpNotifications, lpcb)

#uselib "MAPI32.dll"
#func global ScCountNotifications "ScCountNotifications" sptr, sptr, sptr
; ScCountNotifications cNotifications, varptr(lpNotifications), varptr(lpcb)   ; 戻り値は stat
; cNotifications : INT -> "sptr"
; lpNotifications : NOTIFICATION* in/out -> "sptr"
; lpcb : 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 "MAPI32.dll"
#cfunc global ScCountNotifications "ScCountNotifications" int, var, var
; res = ScCountNotifications(cNotifications, lpNotifications, lpcb)
; cNotifications : INT -> "int"
; lpNotifications : NOTIFICATION* in/out -> "var"
; lpcb : 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。

; INT ScCountNotifications(INT cNotifications, NOTIFICATION* lpNotifications, DWORD* lpcb)
#uselib "MAPI32.dll"
#cfunc global ScCountNotifications "ScCountNotifications" int, var, var
; res = ScCountNotifications(cNotifications, lpNotifications, lpcb)
; cNotifications : INT -> "int"
; lpNotifications : NOTIFICATION* in/out -> "var"
; lpcb : 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 (
	mapi32 = windows.NewLazySystemDLL("MAPI32.dll")
	procScCountNotifications = mapi32.NewProc("ScCountNotifications")
)

// cNotifications (INT), lpNotifications (NOTIFICATION* in/out), lpcb (DWORD* in/out)
r1, _, err := procScCountNotifications.Call(
	uintptr(cNotifications),
	uintptr(lpNotifications),
	uintptr(lpcb),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function ScCountNotifications(
  cNotifications: Integer;   // INT
  lpNotifications: Pointer;   // NOTIFICATION* in/out
  lpcb: Pointer   // DWORD* in/out
): Integer; stdcall;
  external 'MAPI32.dll' name 'ScCountNotifications';

result := DllCall("MAPI32\ScCountNotifications"
    , "Int", cNotifications   ; INT
    , "Ptr", lpNotifications   ; NOTIFICATION* in/out
    , "Ptr", lpcb   ; DWORD* in/out
    , "Int")   ; return: INT

●ScCountNotifications(cNotifications, lpNotifications, lpcb) = DLL("MAPI32.dll", "int ScCountNotifications(int, void*, void*)")
# 呼び出し: ScCountNotifications(cNotifications, lpNotifications, lpcb)
# cNotifications : INT -> "int"
# lpNotifications : NOTIFICATION* in/out -> "void*"
# lpcb : 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)。