SHSetUnreadMailCountW

// SHELL32.dll  (Unicode / -W)
#include <windows.h>

HRESULT SHSetUnreadMailCountW(
    LPCWSTR pszMailAddress,
    DWORD dwCount,
    LPCWSTR pszShellExecuteCommand
);

<DllImport("SHELL32.dll", CharSet:=CharSet.Unicode, ExactSpelling:=True)>
Public Shared Function SHSetUnreadMailCountW(
    <MarshalAs(UnmanagedType.LPWStr)> pszMailAddress As String,   ' LPCWSTR
    dwCount As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPWStr)> pszShellExecuteCommand As String   ' LPCWSTR
) As Integer
End Function

' pszMailAddress : LPCWSTR
' dwCount : DWORD
' pszShellExecuteCommand : LPCWSTR
Declare PtrSafe Function SHSetUnreadMailCountW Lib "shell32" ( _
    ByVal pszMailAddress As LongPtr, _
    ByVal dwCount As Long, _
    ByVal pszShellExecuteCommand As LongPtr) As Long
' Unicode(W): 文字列は ByVal As LongPtr とし StrPtr(unicodeStr) を渡す
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

SHSetUnreadMailCountW = ctypes.windll.shell32.SHSetUnreadMailCountW
SHSetUnreadMailCountW.restype = ctypes.c_int
SHSetUnreadMailCountW.argtypes = [
    wintypes.LPCWSTR,  # pszMailAddress : LPCWSTR
    wintypes.DWORD,  # dwCount : DWORD
    wintypes.LPCWSTR,  # pszShellExecuteCommand : LPCWSTR
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('SHELL32.dll')
SHSetUnreadMailCountW = Fiddle::Function.new(
  lib['SHSetUnreadMailCountW'],
  [
    Fiddle::TYPE_VOIDP,  # pszMailAddress : LPCWSTR
    -Fiddle::TYPE_INT,  # dwCount : DWORD
    Fiddle::TYPE_VOIDP,  # pszShellExecuteCommand : LPCWSTR
  ],
  Fiddle::TYPE_INT)
# Wide strings: pass str.encode("UTF-16LE") + "\x00\x00"

#[link(name = "shell32")]
extern "system" {
    fn SHSetUnreadMailCountW(
        pszMailAddress: *const u16,  // LPCWSTR
        dwCount: u32,  // DWORD
        pszShellExecuteCommand: *const u16  // LPCWSTR
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("SHELL32.dll", CharSet = CharSet.Unicode)]
public static extern int SHSetUnreadMailCountW([MarshalAs(UnmanagedType.LPWStr)] string pszMailAddress, uint dwCount, [MarshalAs(UnmanagedType.LPWStr)] string pszShellExecuteCommand);
"@
$api = Add-Type -MemberDefinition $sig -Name 'SHELL32_SHSetUnreadMailCountW' -Namespace Win32 -PassThru
# $api::SHSetUnreadMailCountW(pszMailAddress, dwCount, pszShellExecuteCommand)

#uselib "SHELL32.dll"
#func global SHSetUnreadMailCountW "SHSetUnreadMailCountW" wptr, wptr, wptr
; SHSetUnreadMailCountW pszMailAddress, dwCount, pszShellExecuteCommand   ; 戻り値は stat
; pszMailAddress : LPCWSTR -> "wptr"
; dwCount : DWORD -> "wptr"
; pszShellExecuteCommand : LPCWSTR -> "wptr"
; ※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 "SHELL32.dll"
#cfunc global SHSetUnreadMailCountW "SHSetUnreadMailCountW" wstr, int, wstr
; res = SHSetUnreadMailCountW(pszMailAddress, dwCount, pszShellExecuteCommand)
; pszMailAddress : LPCWSTR -> "wstr"
; dwCount : DWORD -> "int"
; pszShellExecuteCommand : LPCWSTR -> "wstr"

; HRESULT SHSetUnreadMailCountW(LPCWSTR pszMailAddress, DWORD dwCount, LPCWSTR pszShellExecuteCommand)
#uselib "SHELL32.dll"
#cfunc global SHSetUnreadMailCountW "SHSetUnreadMailCountW" wstr, int, wstr
; res = SHSetUnreadMailCountW(pszMailAddress, dwCount, pszShellExecuteCommand)
; pszMailAddress : LPCWSTR -> "wstr"
; dwCount : DWORD -> "int"
; pszShellExecuteCommand : LPCWSTR -> "wstr"

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

var (
	shell32 = windows.NewLazySystemDLL("SHELL32.dll")
	procSHSetUnreadMailCountW = shell32.NewProc("SHSetUnreadMailCountW")
)

// pszMailAddress (LPCWSTR), dwCount (DWORD), pszShellExecuteCommand (LPCWSTR)
r1, _, err := procSHSetUnreadMailCountW.Call(
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pszMailAddress))),
	uintptr(dwCount),
	uintptr(unsafe.Pointer(windows.StringToUTF16Ptr(pszShellExecuteCommand))),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function SHSetUnreadMailCountW(
  pszMailAddress: PWideChar;   // LPCWSTR
  dwCount: DWORD;   // DWORD
  pszShellExecuteCommand: PWideChar   // LPCWSTR
): Integer; stdcall;
  external 'SHELL32.dll' name 'SHSetUnreadMailCountW';

result := DllCall("SHELL32\SHSetUnreadMailCountW"
    , "WStr", pszMailAddress   ; LPCWSTR
    , "UInt", dwCount   ; DWORD
    , "WStr", pszShellExecuteCommand   ; LPCWSTR
    , "Int")   ; return: HRESULT

●SHSetUnreadMailCountW(pszMailAddress, dwCount, pszShellExecuteCommand) = DLL("SHELL32.dll", "int SHSetUnreadMailCountW(char*, dword, char*)")
# 呼び出し: SHSetUnreadMailCountW(pszMailAddress, dwCount, pszShellExecuteCommand)
# pszMailAddress : LPCWSTR -> "char*"
# dwCount : DWORD -> "dword"
# pszShellExecuteCommand : LPCWSTR -> "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)。
# ※-W(Unicode)関数。なでしこ1はANSIのため -A 版の利用を推奨。

const std = @import("std");

extern "shell32" fn SHSetUnreadMailCountW(
    pszMailAddress: [*c]const u16, // LPCWSTR
    dwCount: u32, // DWORD
    pszShellExecuteCommand: [*c]const u16 // LPCWSTR
) callconv(std.os.windows.WINAPI) i32;
// Unicode(-W): UTF-16LE のヌル終端バッファ([*c]const u16)を渡す。

proc SHSetUnreadMailCountW(
    pszMailAddress: WideCString,  # LPCWSTR
    dwCount: uint32,  # DWORD
    pszShellExecuteCommand: WideCString  # LPCWSTR
): int32 {.importc: "SHSetUnreadMailCountW", stdcall, dynlib: "SHELL32.dll".}
# Unicode(-W): WideCString は newWideCString("...") で生成。

pragma(lib, "shell32");
extern(Windows)
int SHSetUnreadMailCountW(
    const(wchar)* pszMailAddress,   // LPCWSTR
    uint dwCount,   // DWORD
    const(wchar)* pszShellExecuteCommand   // LPCWSTR
);

ccall((:SHSetUnreadMailCountW, "SHELL32.dll"), stdcall, Int32,
      (Cwstring, UInt32, Cwstring),
      pszMailAddress, dwCount, pszShellExecuteCommand)
# pszMailAddress : LPCWSTR -> Cwstring
# dwCount : DWORD -> UInt32
# pszShellExecuteCommand : LPCWSTR -> Cwstring
# stdcall は 32bit のみ意味を持つ(x64 では無視)。
# Unicode(-W): Cwstring には transcode(UInt16, "...") 等で UTF-16 を渡す。

local ffi = require("ffi")
ffi.cdef[[
int32_t SHSetUnreadMailCountW(
    const uint16_t* pszMailAddress,
    uint32_t dwCount,
    const uint16_t* pszShellExecuteCommand);
]]
local shell32 = ffi.load("shell32")
-- shell32.SHSetUnreadMailCountW(pszMailAddress, dwCount, pszShellExecuteCommand)
-- pszMailAddress : LPCWSTR
-- dwCount : DWORD
-- pszShellExecuteCommand : LPCWSTR
-- 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。
-- Unicode(-W): uint16_t* には UTF-16LE のバッファ(ffi.new("uint16_t[?]", ...))を渡す。

const koffi = require('koffi');
const lib = koffi.load('SHELL32.dll');
const SHSetUnreadMailCountW = lib.func('__stdcall', 'SHSetUnreadMailCountW', 'int32_t', ['str16', 'uint32_t', 'str16']);
// SHSetUnreadMailCountW(pszMailAddress, dwCount, pszShellExecuteCommand)
// pszMailAddress : LPCWSTR -> 'str16'
// dwCount : DWORD -> 'uint32_t'
// pszShellExecuteCommand : LPCWSTR -> 'str16'
// 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("SHELL32.dll", {
  SHSetUnreadMailCountW: { parameters: ["buffer", "u32", "buffer"], result: "i32" },
});
// lib.symbols.SHSetUnreadMailCountW(pszMailAddress, dwCount, pszShellExecuteCommand)
// pszMailAddress : LPCWSTR -> "buffer"
// dwCount : DWORD -> "u32"
// pszShellExecuteCommand : LPCWSTR -> "buffer"
// 文字列は "buffer"。Unicode(-W) は new TextEncoder() ではなく UTF-16LE のバイト列(末尾に \x00\x00)を Uint8Array で渡す。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
int32_t SHSetUnreadMailCountW(
    const uint16_t* pszMailAddress,
    uint32_t dwCount,
    const uint16_t* pszShellExecuteCommand);
C, "SHELL32.dll");
// $ffi->SHSetUnreadMailCountW(pszMailAddress, dwCount, pszShellExecuteCommand);
// pszMailAddress : LPCWSTR
// dwCount : DWORD
// pszShellExecuteCommand : LPCWSTR
// 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 Shell32 extends StdCallLibrary {
    Shell32 INSTANCE = Native.load("shell32", Shell32.class, W32APIOptions.UNICODE_OPTIONS);
    int SHSetUnreadMailCountW(
        WString pszMailAddress,   // LPCWSTR
        int dwCount,   // DWORD
        WString pszShellExecuteCommand   // LPCWSTR
    );
}
// Unicode(-W): WString(入力)/char[](出力)で UTF-16 をマーシャリング。

@[Link("shell32")]
lib LibSHELL32
  fun SHSetUnreadMailCountW = SHSetUnreadMailCountW(
    pszMailAddress : UInt16*,   # LPCWSTR
    dwCount : UInt32,   # DWORD
    pszShellExecuteCommand : UInt16*   # LPCWSTR
  ) : Int32
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 SHSetUnreadMailCountWNative = Int32 Function(Pointer<Utf16>, Uint32, Pointer<Utf16>);
typedef SHSetUnreadMailCountWDart = int Function(Pointer<Utf16>, int, Pointer<Utf16>);
final SHSetUnreadMailCountW = DynamicLibrary.open('SHELL32.dll')
    .lookupFunction<SHSetUnreadMailCountWNative, SHSetUnreadMailCountWDart>('SHSetUnreadMailCountW');
// pszMailAddress : LPCWSTR -> Pointer<Utf16>
// dwCount : DWORD -> Uint32
// pszShellExecuteCommand : LPCWSTR -> Pointer<Utf16>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function SHSetUnreadMailCountW(
  pszMailAddress: PWideChar;   // LPCWSTR
  dwCount: DWORD;   // DWORD
  pszShellExecuteCommand: PWideChar   // LPCWSTR
): Integer; stdcall;
  external 'SHELL32.dll' name 'SHSetUnreadMailCountW';

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

foreign import stdcall safe "SHSetUnreadMailCountW"
  c_SHSetUnreadMailCountW :: CWString -> Word32 -> CWString -> IO Int32
-- pszMailAddress : LPCWSTR -> CWString
-- dwCount : DWORD -> Word32
-- pszShellExecuteCommand : LPCWSTR -> CWString
-- 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 shsetunreadmailcountw =
  foreign "SHSetUnreadMailCountW"
    ((ptr uint16_t) @-> uint32_t @-> (ptr uint16_t) @-> returning int32_t)
(* pszMailAddress : LPCWSTR -> (ptr uint16_t) *)
(* dwCount : DWORD -> uint32_t *)
(* pszShellExecuteCommand : LPCWSTR -> (ptr uint16_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 shell32 (t "SHELL32.dll"))
(cffi:use-foreign-library shell32)

(cffi:defcfun ("SHSetUnreadMailCountW" shset-unread-mail-count-w :convention :stdcall) :int32
  (psz-mail-address (:string :encoding :utf-16le))   ; LPCWSTR
  (dw-count :uint32)   ; DWORD
  (psz-shell-execute-command (:string :encoding :utf-16le)))   ; LPCWSTR
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $SHSetUnreadMailCountW = Win32::API::More->new('SHELL32',
    'int SHSetUnreadMailCountW(LPCWSTR pszMailAddress, DWORD dwCount, LPCWSTR pszShellExecuteCommand)');
# my $ret = $SHSetUnreadMailCountW->Call($pszMailAddress, $dwCount, $pszShellExecuteCommand);
# pszMailAddress : LPCWSTR -> LPCWSTR
# dwCount : DWORD -> DWORD
# pszShellExecuteCommand : LPCWSTR -> LPCWSTR
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。
# Unicode(-W): LPCWSTR/LPWSTR は Win32::API が UTF-16 変換を行う。