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WTSSendMessageA

関数

指定セッションにメッセージボックスを表示して応答を取得する。

DLLWTSAPI32.dll文字セットANSI (-A)呼出規約winapiSetLastErrorあり対応OSWindows Vista 以降

シグネチャ

// WTSAPI32.dll  (ANSI / -A)
#include <windows.h>

BOOL WTSSendMessageA(
    HANDLE hServer,   // optional
    DWORD SessionId,
    LPSTR pTitle,
    DWORD TitleLength,
    LPSTR pMessage,
    DWORD MessageLength,
    MESSAGEBOX_STYLE Style,
    DWORD Timeout,
    MESSAGEBOX_RESULT* pResponse,
    BOOL bWait
);

パラメーター

名前	型	方向	説明
hServer	HANDLE	optional	対象RDサーバーのハンドル。ローカルにはWTS_CURRENT_SERVER_HANDLEを指定。
SessionId	DWORD	in	メッセージを表示する対象セッションのID。
pTitle	LPSTR	in	メッセージボックスのタイトル文字列を指すANSI文字列。
TitleLength	DWORD	in	pTitleのバイト数。
pMessage	LPSTR	in	表示する本文を指すANSI文字列。
MessageLength	DWORD	in	pMessageのバイト数。
Style	MESSAGEBOX_STYLE	in	メッセージボックスのスタイルフラグ(ボタン・アイコン種別)。
Timeout	DWORD	in	ユーザー応答を待つ秒数。0で無期限に待機する。
pResponse	MESSAGEBOX_RESULT*	out	ユーザーが押したボタンの結果(IDOK等)を受け取るポインタ(出力)。
bWait	BOOL	in	TRUEでユーザー応答まで待機、FALSEで即座に戻る。

戻り値の型: BOOL

各言語での呼び出し定義

// WTSAPI32.dll  (ANSI / -A)
#include <windows.h>

BOOL WTSSendMessageA(
    HANDLE hServer,   // optional
    DWORD SessionId,
    LPSTR pTitle,
    DWORD TitleLength,
    LPSTR pMessage,
    DWORD MessageLength,
    MESSAGEBOX_STYLE Style,
    DWORD Timeout,
    MESSAGEBOX_RESULT* pResponse,
    BOOL bWait
);

[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("WTSAPI32.dll", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
static extern bool WTSSendMessageA(
    IntPtr hServer,   // HANDLE optional
    uint SessionId,   // DWORD
    [MarshalAs(UnmanagedType.LPStr)] string pTitle,   // LPSTR
    uint TitleLength,   // DWORD
    [MarshalAs(UnmanagedType.LPStr)] string pMessage,   // LPSTR
    uint MessageLength,   // DWORD
    uint Style,   // MESSAGEBOX_STYLE
    uint Timeout,   // DWORD
    out int pResponse,   // MESSAGEBOX_RESULT* out
    bool bWait   // BOOL
);

<DllImport("WTSAPI32.dll", CharSet:=CharSet.Ansi, SetLastError:=True, ExactSpelling:=True)>
Public Shared Function WTSSendMessageA(
    hServer As IntPtr,   ' HANDLE optional
    SessionId As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPStr)> pTitle As String,   ' LPSTR
    TitleLength As UInteger,   ' DWORD
    <MarshalAs(UnmanagedType.LPStr)> pMessage As String,   ' LPSTR
    MessageLength As UInteger,   ' DWORD
    Style As UInteger,   ' MESSAGEBOX_STYLE
    Timeout As UInteger,   ' DWORD
    <Out> ByRef pResponse As Integer,   ' MESSAGEBOX_RESULT* out
    bWait As Boolean   ' BOOL
) As <MarshalAs(UnmanagedType.Bool)> Boolean
End Function

' hServer : HANDLE optional
' SessionId : DWORD
' pTitle : LPSTR
' TitleLength : DWORD
' pMessage : LPSTR
' MessageLength : DWORD
' Style : MESSAGEBOX_STYLE
' Timeout : DWORD
' pResponse : MESSAGEBOX_RESULT* out
' bWait : BOOL
Declare PtrSafe Function WTSSendMessageA Lib "wtsapi32" ( _
    ByVal hServer As LongPtr, _
    ByVal SessionId As Long, _
    ByVal pTitle As String, _
    ByVal TitleLength As Long, _
    ByVal pMessage As String, _
    ByVal MessageLength As Long, _
    ByVal Style As Long, _
    ByVal Timeout As Long, _
    ByRef pResponse As Long, _
    ByVal bWait 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

WTSSendMessageA = ctypes.windll.wtsapi32.WTSSendMessageA
WTSSendMessageA.restype = wintypes.BOOL
WTSSendMessageA.argtypes = [
    wintypes.HANDLE,  # hServer : HANDLE optional
    wintypes.DWORD,  # SessionId : DWORD
    wintypes.LPCSTR,  # pTitle : LPSTR
    wintypes.DWORD,  # TitleLength : DWORD
    wintypes.LPCSTR,  # pMessage : LPSTR
    wintypes.DWORD,  # MessageLength : DWORD
    wintypes.DWORD,  # Style : MESSAGEBOX_STYLE
    wintypes.DWORD,  # Timeout : DWORD
    ctypes.c_void_p,  # pResponse : MESSAGEBOX_RESULT* out
    wintypes.BOOL,  # bWait : BOOL
]
# GetLastError: use ctypes.GetLastError() (or ctypes.WinDLL(use_last_error=True))

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('WTSAPI32.dll')
WTSSendMessageA = Fiddle::Function.new(
  lib['WTSSendMessageA'],
  [
    Fiddle::TYPE_VOIDP,  # hServer : HANDLE optional
    -Fiddle::TYPE_INT,  # SessionId : DWORD
    Fiddle::TYPE_VOIDP,  # pTitle : LPSTR
    -Fiddle::TYPE_INT,  # TitleLength : DWORD
    Fiddle::TYPE_VOIDP,  # pMessage : LPSTR
    -Fiddle::TYPE_INT,  # MessageLength : DWORD
    -Fiddle::TYPE_INT,  # Style : MESSAGEBOX_STYLE
    -Fiddle::TYPE_INT,  # Timeout : DWORD
    Fiddle::TYPE_VOIDP,  # pResponse : MESSAGEBOX_RESULT* out
    Fiddle::TYPE_INT,  # bWait : BOOL
  ],
  Fiddle::TYPE_INT)

#[link(name = "wtsapi32")]
extern "system" {
    fn WTSSendMessageA(
        hServer: *mut core::ffi::c_void,  // HANDLE optional
        SessionId: u32,  // DWORD
        pTitle: *mut u8,  // LPSTR
        TitleLength: u32,  // DWORD
        pMessage: *mut u8,  // LPSTR
        MessageLength: u32,  // DWORD
        Style: u32,  // MESSAGEBOX_STYLE
        Timeout: u32,  // DWORD
        pResponse: *mut i32,  // MESSAGEBOX_RESULT* out
        bWait: i32  // BOOL
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("WTSAPI32.dll", CharSet = CharSet.Ansi, SetLastError = true)]
public static extern bool WTSSendMessageA(IntPtr hServer, uint SessionId, [MarshalAs(UnmanagedType.LPStr)] string pTitle, uint TitleLength, [MarshalAs(UnmanagedType.LPStr)] string pMessage, uint MessageLength, uint Style, uint Timeout, out int pResponse, bool bWait);
"@
$api = Add-Type -MemberDefinition $sig -Name 'WTSAPI32_WTSSendMessageA' -Namespace Win32 -PassThru
# $api::WTSSendMessageA(hServer, SessionId, pTitle, TitleLength, pMessage, MessageLength, Style, Timeout, pResponse, bWait)

#uselib "WTSAPI32.dll"
#func global WTSSendMessageA "WTSSendMessageA" sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr, sptr
; WTSSendMessageA hServer, SessionId, pTitle, TitleLength, pMessage, MessageLength, Style, Timeout, varptr(pResponse), bWait   ; 戻り値は stat
; hServer : HANDLE optional -> "sptr"
; SessionId : DWORD -> "sptr"
; pTitle : LPSTR -> "sptr"
; TitleLength : DWORD -> "sptr"
; pMessage : LPSTR -> "sptr"
; MessageLength : DWORD -> "sptr"
; Style : MESSAGEBOX_STYLE -> "sptr"
; Timeout : DWORD -> "sptr"
; pResponse : MESSAGEBOX_RESULT* out -> "sptr"
; bWait : BOOL -> "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。

出力引数:

#uselib "WTSAPI32.dll"
#cfunc global WTSSendMessageA "WTSSendMessageA" sptr, int, str, int, str, int, int, int, var, int
; res = WTSSendMessageA(hServer, SessionId, pTitle, TitleLength, pMessage, MessageLength, Style, Timeout, pResponse, bWait)
; hServer : HANDLE optional -> "sptr"
; SessionId : DWORD -> "int"
; pTitle : LPSTR -> "str"
; TitleLength : DWORD -> "int"
; pMessage : LPSTR -> "str"
; MessageLength : DWORD -> "int"
; Style : MESSAGEBOX_STYLE -> "int"
; Timeout : DWORD -> "int"
; pResponse : MESSAGEBOX_RESULT* out -> "var"
; bWait : BOOL -> "int"
; ※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。#uselib "WTSAPI32.dll"
#cfunc global WTSSendMessageA "WTSSendMessageA" sptr, int, str, int, str, int, int, int, sptr, int
; res = WTSSendMessageA(hServer, SessionId, pTitle, TitleLength, pMessage, MessageLength, Style, Timeout, varptr(pResponse), bWait)
; hServer : HANDLE optional -> "sptr"
; SessionId : DWORD -> "int"
; pTitle : LPSTR -> "str"
; TitleLength : DWORD -> "int"
; pMessage : LPSTR -> "str"
; MessageLength : DWORD -> "int"
; Style : MESSAGEBOX_STYLE -> "int"
; Timeout : DWORD -> "int"
; pResponse : MESSAGEBOX_RESULT* out -> "sptr"
; bWait : BOOL -> "int"
; ※出力/バッファ引数はポインタ方式(token=sptr / 呼び出しは varptr(変数))。

出力引数:

; BOOL WTSSendMessageA(HANDLE hServer, DWORD SessionId, LPSTR pTitle, DWORD TitleLength, LPSTR pMessage, DWORD MessageLength, MESSAGEBOX_STYLE Style, DWORD Timeout, MESSAGEBOX_RESULT* pResponse, BOOL bWait)
#uselib "WTSAPI32.dll"
#cfunc global WTSSendMessageA "WTSSendMessageA" intptr, int, str, int, str, int, int, int, var, int
; res = WTSSendMessageA(hServer, SessionId, pTitle, TitleLength, pMessage, MessageLength, Style, Timeout, pResponse, bWait)
; hServer : HANDLE optional -> "intptr"
; SessionId : DWORD -> "int"
; pTitle : LPSTR -> "str"
; TitleLength : DWORD -> "int"
; pMessage : LPSTR -> "str"
; MessageLength : DWORD -> "int"
; Style : MESSAGEBOX_STYLE -> "int"
; Timeout : DWORD -> "int"
; pResponse : MESSAGEBOX_RESULT* out -> "var"
; bWait : BOOL -> "int"
; ※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。; BOOL WTSSendMessageA(HANDLE hServer, DWORD SessionId, LPSTR pTitle, DWORD TitleLength, LPSTR pMessage, DWORD MessageLength, MESSAGEBOX_STYLE Style, DWORD Timeout, MESSAGEBOX_RESULT* pResponse, BOOL bWait)
#uselib "WTSAPI32.dll"
#cfunc global WTSSendMessageA "WTSSendMessageA" intptr, int, str, int, str, int, int, int, intptr, int
; res = WTSSendMessageA(hServer, SessionId, pTitle, TitleLength, pMessage, MessageLength, Style, Timeout, varptr(pResponse), bWait)
; hServer : HANDLE optional -> "intptr"
; SessionId : DWORD -> "int"
; pTitle : LPSTR -> "str"
; TitleLength : DWORD -> "int"
; pMessage : LPSTR -> "str"
; MessageLength : DWORD -> "int"
; Style : MESSAGEBOX_STYLE -> "int"
; Timeout : DWORD -> "int"
; pResponse : MESSAGEBOX_RESULT* out -> "intptr"
; bWait : BOOL -> "int"
; ※出力/バッファ引数はポインタ方式(token=intptr / 呼び出しは varptr(変数))。

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

var (
	wtsapi32 = windows.NewLazySystemDLL("WTSAPI32.dll")
	procWTSSendMessageA = wtsapi32.NewProc("WTSSendMessageA")
)

// hServer (HANDLE optional), SessionId (DWORD), pTitle (LPSTR), TitleLength (DWORD), pMessage (LPSTR), MessageLength (DWORD), Style (MESSAGEBOX_STYLE), Timeout (DWORD), pResponse (MESSAGEBOX_RESULT* out), bWait (BOOL)
r1, _, err := procWTSSendMessageA.Call(
	uintptr(hServer),
	uintptr(SessionId),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(pTitle))),
	uintptr(TitleLength),
	uintptr(unsafe.Pointer(windows.BytePtrFromString(pMessage))),
	uintptr(MessageLength),
	uintptr(Style),
	uintptr(Timeout),
	uintptr(pResponse),
	uintptr(bWait),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // BOOL

function WTSSendMessageA(
  hServer: THandle;   // HANDLE optional
  SessionId: DWORD;   // DWORD
  pTitle: PAnsiChar;   // LPSTR
  TitleLength: DWORD;   // DWORD
  pMessage: PAnsiChar;   // LPSTR
  MessageLength: DWORD;   // DWORD
  Style: DWORD;   // MESSAGEBOX_STYLE
  Timeout: DWORD;   // DWORD
  pResponse: Pointer;   // MESSAGEBOX_RESULT* out
  bWait: BOOL   // BOOL
): BOOL; stdcall;
  external 'WTSAPI32.dll' name 'WTSSendMessageA';

result := DllCall("WTSAPI32\WTSSendMessageA"
    , "Ptr", hServer   ; HANDLE optional
    , "UInt", SessionId   ; DWORD
    , "AStr", pTitle   ; LPSTR
    , "UInt", TitleLength   ; DWORD
    , "AStr", pMessage   ; LPSTR
    , "UInt", MessageLength   ; DWORD
    , "UInt", Style   ; MESSAGEBOX_STYLE
    , "UInt", Timeout   ; DWORD
    , "Ptr", pResponse   ; MESSAGEBOX_RESULT* out
    , "Int", bWait   ; BOOL
    , "Int")   ; return: BOOL

●WTSSendMessageA(hServer, SessionId, pTitle, TitleLength, pMessage, MessageLength, Style, Timeout, pResponse, bWait) = DLL("WTSAPI32.dll", "bool WTSSendMessageA(void*, dword, char*, dword, char*, dword, dword, dword, void*, bool)")
# 呼び出し: WTSSendMessageA(hServer, SessionId, pTitle, TitleLength, pMessage, MessageLength, Style, Timeout, pResponse, bWait)
# hServer : HANDLE optional -> "void*"
# SessionId : DWORD -> "dword"
# pTitle : LPSTR -> "char*"
# TitleLength : DWORD -> "dword"
# pMessage : LPSTR -> "char*"
# MessageLength : DWORD -> "dword"
# Style : MESSAGEBOX_STYLE -> "dword"
# Timeout : DWORD -> "dword"
# pResponse : MESSAGEBOX_RESULT* out -> "void*"
# bWait : BOOL -> "bool"
# 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)。

const std = @import("std");

extern "wtsapi32" fn WTSSendMessageA(
    hServer: ?*anyopaque, // HANDLE optional
    SessionId: u32, // DWORD
    pTitle: [*c]const u8, // LPSTR
    TitleLength: u32, // DWORD
    pMessage: [*c]const u8, // LPSTR
    MessageLength: u32, // DWORD
    Style: u32, // MESSAGEBOX_STYLE
    Timeout: u32, // DWORD
    pResponse: [*c]i32, // MESSAGEBOX_RESULT* out
    bWait: i32 // BOOL
) callconv(std.os.windows.WINAPI) i32;

proc WTSSendMessageA(
    hServer: pointer,  # HANDLE optional
    SessionId: uint32,  # DWORD
    pTitle: cstring,  # LPSTR
    TitleLength: uint32,  # DWORD
    pMessage: cstring,  # LPSTR
    MessageLength: uint32,  # DWORD
    Style: uint32,  # MESSAGEBOX_STYLE
    Timeout: uint32,  # DWORD
    pResponse: ptr int32,  # MESSAGEBOX_RESULT* out
    bWait: int32  # BOOL
): int32 {.importc: "WTSSendMessageA", stdcall, dynlib: "WTSAPI32.dll".}

pragma(lib, "wtsapi32");
extern(Windows)
int WTSSendMessageA(
    void* hServer,   // HANDLE optional
    uint SessionId,   // DWORD
    const(char)* pTitle,   // LPSTR
    uint TitleLength,   // DWORD
    const(char)* pMessage,   // LPSTR
    uint MessageLength,   // DWORD
    uint Style,   // MESSAGEBOX_STYLE
    uint Timeout,   // DWORD
    int* pResponse,   // MESSAGEBOX_RESULT* out
    int bWait   // BOOL
);

ccall((:WTSSendMessageA, "WTSAPI32.dll"), stdcall, Int32,
      (Ptr{Cvoid}, UInt32, Cstring, UInt32, Cstring, UInt32, UInt32, UInt32, Ptr{Int32}, Int32),
      hServer, SessionId, pTitle, TitleLength, pMessage, MessageLength, Style, Timeout, pResponse, bWait)
# hServer : HANDLE optional -> Ptr{Cvoid}
# SessionId : DWORD -> UInt32
# pTitle : LPSTR -> Cstring
# TitleLength : DWORD -> UInt32
# pMessage : LPSTR -> Cstring
# MessageLength : DWORD -> UInt32
# Style : MESSAGEBOX_STYLE -> UInt32
# Timeout : DWORD -> UInt32
# pResponse : MESSAGEBOX_RESULT* out -> Ptr{Int32}
# bWait : BOOL -> Int32
# stdcall は 32bit のみ意味を持つ(x64 では無視)。

local ffi = require("ffi")
ffi.cdef[[
int32_t WTSSendMessageA(
    void* hServer,
    uint32_t SessionId,
    const char* pTitle,
    uint32_t TitleLength,
    const char* pMessage,
    uint32_t MessageLength,
    uint32_t Style,
    uint32_t Timeout,
    int32_t* pResponse,
    int32_t bWait);
]]
local wtsapi32 = ffi.load("wtsapi32")
-- wtsapi32.WTSSendMessageA(hServer, SessionId, pTitle, TitleLength, pMessage, MessageLength, Style, Timeout, pResponse, bWait)
-- hServer : HANDLE optional
-- SessionId : DWORD
-- pTitle : LPSTR
-- TitleLength : DWORD
-- pMessage : LPSTR
-- MessageLength : DWORD
-- Style : MESSAGEBOX_STYLE
-- Timeout : DWORD
-- pResponse : MESSAGEBOX_RESULT* out
-- bWait : BOOL
-- 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。

const koffi = require('koffi');
const lib = koffi.load('WTSAPI32.dll');
const WTSSendMessageA = lib.func('__stdcall', 'WTSSendMessageA', 'int32_t', ['void *', 'uint32_t', 'str', 'uint32_t', 'str', 'uint32_t', 'uint32_t', 'uint32_t', 'int32_t *', 'int32_t']);
// WTSSendMessageA(hServer, SessionId, pTitle, TitleLength, pMessage, MessageLength, Style, Timeout, pResponse, bWait)
// hServer : HANDLE optional -> 'void *'
// SessionId : DWORD -> 'uint32_t'
// pTitle : LPSTR -> 'str'
// TitleLength : DWORD -> 'uint32_t'
// pMessage : LPSTR -> 'str'
// MessageLength : DWORD -> 'uint32_t'
// Style : MESSAGEBOX_STYLE -> 'uint32_t'
// Timeout : DWORD -> 'uint32_t'
// pResponse : MESSAGEBOX_RESULT* out -> 'int32_t *'
// bWait : BOOL -> 'int32_t'
// 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("WTSAPI32.dll", {
  WTSSendMessageA: { parameters: ["pointer", "u32", "buffer", "u32", "buffer", "u32", "u32", "u32", "pointer", "i32"], result: "i32" },
});
// lib.symbols.WTSSendMessageA(hServer, SessionId, pTitle, TitleLength, pMessage, MessageLength, Style, Timeout, pResponse, bWait)
// hServer : HANDLE optional -> "pointer"
// SessionId : DWORD -> "u32"
// pTitle : LPSTR -> "buffer"
// TitleLength : DWORD -> "u32"
// pMessage : LPSTR -> "buffer"
// MessageLength : DWORD -> "u32"
// Style : MESSAGEBOX_STYLE -> "u32"
// Timeout : DWORD -> "u32"
// pResponse : MESSAGEBOX_RESULT* out -> "pointer"
// bWait : BOOL -> "i32"
// 文字列は "buffer"。ANSI(-A) は new TextEncoder() で UTF-8/ANSI バイト列(末尾に \x00)を渡す。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
int32_t WTSSendMessageA(
    void* hServer,
    uint32_t SessionId,
    const char* pTitle,
    uint32_t TitleLength,
    const char* pMessage,
    uint32_t MessageLength,
    uint32_t Style,
    uint32_t Timeout,
    int32_t* pResponse,
    int32_t bWait);
C, "WTSAPI32.dll");
// $ffi->WTSSendMessageA(hServer, SessionId, pTitle, TitleLength, pMessage, MessageLength, Style, Timeout, pResponse, bWait);
// hServer : HANDLE optional
// SessionId : DWORD
// pTitle : LPSTR
// TitleLength : DWORD
// pMessage : LPSTR
// MessageLength : DWORD
// Style : MESSAGEBOX_STYLE
// Timeout : DWORD
// pResponse : MESSAGEBOX_RESULT* out
// bWait : BOOL
// 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 Wtsapi32 extends StdCallLibrary {
    Wtsapi32 INSTANCE = Native.load("wtsapi32", Wtsapi32.class, W32APIOptions.ASCII_OPTIONS);
    boolean WTSSendMessageA(
        Pointer hServer,   // HANDLE optional
        int SessionId,   // DWORD
        String pTitle,   // LPSTR
        int TitleLength,   // DWORD
        String pMessage,   // LPSTR
        int MessageLength,   // DWORD
        int Style,   // MESSAGEBOX_STYLE
        int Timeout,   // DWORD
        IntByReference pResponse,   // MESSAGEBOX_RESULT* out
        boolean bWait   // BOOL
    );
}

@[Link("wtsapi32")]
lib LibWTSAPI32
  fun WTSSendMessageA = WTSSendMessageA(
    hServer : Void*,   # HANDLE optional
    SessionId : UInt32,   # DWORD
    pTitle : UInt8*,   # LPSTR
    TitleLength : UInt32,   # DWORD
    pMessage : UInt8*,   # LPSTR
    MessageLength : UInt32,   # DWORD
    Style : UInt32,   # MESSAGEBOX_STYLE
    Timeout : UInt32,   # DWORD
    pResponse : Int32*,   # MESSAGEBOX_RESULT* out
    bWait : Int32   # BOOL
  ) : 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 WTSSendMessageANative = Int32 Function(Pointer<Void>, Uint32, Pointer<Utf8>, Uint32, Pointer<Utf8>, Uint32, Uint32, Uint32, Pointer<Int32>, Int32);
typedef WTSSendMessageADart = int Function(Pointer<Void>, int, Pointer<Utf8>, int, Pointer<Utf8>, int, int, int, Pointer<Int32>, int);
final WTSSendMessageA = DynamicLibrary.open('WTSAPI32.dll')
    .lookupFunction<WTSSendMessageANative, WTSSendMessageADart>('WTSSendMessageA');
// hServer : HANDLE optional -> Pointer<Void>
// SessionId : DWORD -> Uint32
// pTitle : LPSTR -> Pointer<Utf8>
// TitleLength : DWORD -> Uint32
// pMessage : LPSTR -> Pointer<Utf8>
// MessageLength : DWORD -> Uint32
// Style : MESSAGEBOX_STYLE -> Uint32
// Timeout : DWORD -> Uint32
// pResponse : MESSAGEBOX_RESULT* out -> Pointer<Int32>
// bWait : BOOL -> Int32
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function WTSSendMessageA(
  hServer: THandle;   // HANDLE optional
  SessionId: DWORD;   // DWORD
  pTitle: PAnsiChar;   // LPSTR
  TitleLength: DWORD;   // DWORD
  pMessage: PAnsiChar;   // LPSTR
  MessageLength: DWORD;   // DWORD
  Style: DWORD;   // MESSAGEBOX_STYLE
  Timeout: DWORD;   // DWORD
  pResponse: Pointer;   // MESSAGEBOX_RESULT* out
  bWait: BOOL   // BOOL
): BOOL; stdcall;
  external 'WTSAPI32.dll' name 'WTSSendMessageA';

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

foreign import stdcall safe "WTSSendMessageA"
  c_WTSSendMessageA :: Ptr () -> Word32 -> CString -> Word32 -> CString -> Word32 -> Word32 -> Word32 -> Ptr Int32 -> CInt -> IO CInt
-- hServer : HANDLE optional -> Ptr ()
-- SessionId : DWORD -> Word32
-- pTitle : LPSTR -> CString
-- TitleLength : DWORD -> Word32
-- pMessage : LPSTR -> CString
-- MessageLength : DWORD -> Word32
-- Style : MESSAGEBOX_STYLE -> Word32
-- Timeout : DWORD -> Word32
-- pResponse : MESSAGEBOX_RESULT* out -> Ptr Int32
-- bWait : BOOL -> CInt
-- 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 wtssendmessagea =
  foreign "WTSSendMessageA"
    ((ptr void) @-> uint32_t @-> string @-> uint32_t @-> string @-> uint32_t @-> uint32_t @-> uint32_t @-> (ptr int32_t) @-> int32_t @-> returning int32_t)
(* hServer : HANDLE optional -> (ptr void) *)
(* SessionId : DWORD -> uint32_t *)
(* pTitle : LPSTR -> string *)
(* TitleLength : DWORD -> uint32_t *)
(* pMessage : LPSTR -> string *)
(* MessageLength : DWORD -> uint32_t *)
(* Style : MESSAGEBOX_STYLE -> uint32_t *)
(* Timeout : DWORD -> uint32_t *)
(* pResponse : MESSAGEBOX_RESULT* out -> (ptr int32_t) *)
(* bWait : BOOL -> int32_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 wtsapi32 (t "WTSAPI32.dll"))
(cffi:use-foreign-library wtsapi32)

(cffi:defcfun ("WTSSendMessageA" wtssend-message-a :convention :stdcall) :int32
  (h-server :pointer)   ; HANDLE optional
  (session-id :uint32)   ; DWORD
  (p-title :string)   ; LPSTR
  (title-length :uint32)   ; DWORD
  (p-message :string)   ; LPSTR
  (message-length :uint32)   ; DWORD
  (style :uint32)   ; MESSAGEBOX_STYLE
  (timeout :uint32)   ; DWORD
  (p-response :pointer)   ; MESSAGEBOX_RESULT* out
  (b-wait :int32))   ; BOOL
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $WTSSendMessageA = Win32::API::More->new('WTSAPI32',
    'BOOL WTSSendMessageA(HANDLE hServer, DWORD SessionId, LPCSTR pTitle, DWORD TitleLength, LPCSTR pMessage, DWORD MessageLength, DWORD Style, DWORD Timeout, LPVOID pResponse, BOOL bWait)');
# my $ret = $WTSSendMessageA->Call($hServer, $SessionId, $pTitle, $TitleLength, $pMessage, $MessageLength, $Style, $Timeout, $pResponse, $bWait);
# hServer : HANDLE optional -> HANDLE
# SessionId : DWORD -> DWORD
# pTitle : LPSTR -> LPCSTR
# TitleLength : DWORD -> DWORD
# pMessage : LPSTR -> LPCSTR
# MessageLength : DWORD -> DWORD
# Style : MESSAGEBOX_STYLE -> DWORD
# Timeout : DWORD -> DWORD
# pResponse : MESSAGEBOX_RESULT* out -> LPVOID
# bWait : BOOL -> BOOL
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。

WTSSendMessageA

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