はじめに

使う機会は少ないが、Win32API「MessageBoxTimeout」の使用例を残す

※試しにMessageBoxTimeoutに関する記事が無いか検索したが、
　1件のみで寂しい気持ちになったから書いたのもある。探し方が悪かったのだろうか？

参考元

ExcelVBA

C#及びVB.NET

VB.NET側

定義

MsgTimeOut.vb

Imports System.Runtime.InteropServices
Public Class MsgTimeOut
    <DllImport("user32.dll", EntryPoint:="MessageBoxTimeoutW", SetLastError:=True, CharSet:=CharSet.Unicode)>
    Private Shared Function MessageBoxTimeOut _
        (ByVal hWnd As IntPtr, _
         ByVal lpText As String, _
         ByVal lpCaption As String, _
         ByVal uType As UInteger, _
         ByVal wLanguage As Int16, _
         ByVal dwMilliseconds As Int32) As UInteger
    End Function

    ''' <summary>簡易式</summary>
    Public Shared Function Show(ByVal lpText As String, _
                                ByVal lpCaption As String, _
                                ByVal uType As UInteger, _
                                ByVal dwMilliseconds As Int32) As UInteger
        Return MessageBoxTimeOut(CType(0, IntPtr), lpText, lpCaption, uType, 0, dwMilliseconds)
    End Function

    ''' <summary>全指定</summary>
    Public Shared Function Show(ByVal hWnd As IntPtr, _
                                ByVal lpText As String, _
                                ByVal lpCaption As String, _
                                ByVal uType As UInteger, _
                                ByVal wLanguage As Int16, _
                                ByVal dwMilliseconds As Int32) As UInteger
        Return MessageBoxTimeOut(hWnd, lpText, lpCaption, uType, wLanguage, dwMilliseconds)
    End Function
End Class

VB.NET使用例

Public Class Form1
    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        ' 簡易式
        MsgTimeOut.Show("簡易式", "テストタイトル", MessageBoxButtons.OK, 5000)
        ' フル設定
        MsgTimeOut.Show(CType(0, IntPtr), _
                        "フル設定", _
                        "テストタイトル", _
                        MessageBoxButtons.OK, _
                        0, _
                        1000)
    End Sub
End Class

C#側

定義

MsgTimeOut.cs

using System.Runtime.InteropServices;
namespace WinFormsApp
{
    public class MsgBoxTimeout
    {
#pragma warning disable SA1121
        [DllImport("user32.dll", SetLastError=true)]
        private static extern int MessageBoxTimeout(IntPtr hWnd,
                                                    string text,
                                                    string title,
                                                    uint type,
                                                    Int16 wLanguageId,
                                                    Int32 milliseconds);

        /// <summary>簡易版</summary>
        public void Show(string text, string title, uint type, Int32 milliseconds)
            => MessageBoxTimeout((IntPtr)0, text, title, type, 0, milliseconds);

        /// <summary>全部指定</summary>
        public void Show(IntPtr hWnd,
            string text,
            string title,
            uint type,
            Int16 wLanguageId,
            Int32 milliseconds)
            => MessageBoxTimeout(hWnd, text, title, type, wLanguageId, milliseconds);
#pragma warning restore SA1121
    }
}

C#使用例

namespace WinFormsApp
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            MsgBoxTimeout cMBT = new MsgBoxTimeout();
            // 簡易式
            cMBT.Show("簡易式", "テストタイトル", (uint)MessageBoxButtons.OK, 5000);
            // フル設定
            cMBT.Show((IntPtr)0, "フル設定", "テストタイトル", (uint)MessageBoxButtons.OK, 0, 1000);
        }
    }
}