[API] 實作 MessageBox

Introduction

製作一個 Console 專案，來測試訊息視窗。

Example

引用 “user32.dll” 參考函式原型

int MessageBox(      
    HWND hWnd,
    LPCTSTR lpText,
    LPCTSTR lpCaption,
    UINT uType
);

必須打造相對於原型的 C# 版本函式，以及其他相關資料。

using System.Runtime.InteropServices;

namespace TestWin32ApiMessageBox {

class Program {

[DllImport("user32.dll", CharSet = CharSet.Auto)]

public static extern MessageBoxResult MessageBox(IntPtr hWnd, String text, String caption, MessageBoxOptions options);

/// <summary>

/// Flags that define appearance and behaviour of a standard message box displayed by a call to the MessageBox function.

/// </summary>

[Flags]

public enum MessageBoxOptions : uint {

Ok = 0x000000,
OkCancel = 0x000001,
AbortRetryIgnore = 0x000002,
YesNoCancel = 0x000003,

YesNo = 0x000004,

RetryCancel = 0x000005,

CancelTryContinue = 0x000006,

IconHand = 0x000010,

IconQuestion = 0x000020,

IconExclamation = 0x000030,

IconAsterisk = 0x000040,

UserIcon = 0x000080,

IconWarning = IconExclamation,

IconError = IconHand,
IconInformation = IconAsterisk,

IconStop = IconHand,

DefButton1 = 0x000000,
DefButton2 = 0x000100,

DefButton3 = 0x000200,

DefButton4 = 0x000300,

ApplicationModal = 0x000000,
SystemModal = 0x001000,
TaskModal = 0x002000,

Help = 0x004000, //Help Button
NoFocus = 0x008000,

SetForeground = 0x010000,
DefaultDesktopOnly = 0x020000,
Topmost = 0x040000,
Right = 0x080000,
RTLReading = 0x100000,
}

/// <summary>
/// Represents possible values returned by the MessageBox function.
/// </summary>
public enum MessageBoxResult : uint {
Ok = 1,
Cancel,
Abort,
Retry,
Ignore,
Yes,
No,
Close,
Help,
TryAgain,
Continue,
Timeout = 32000
}

static void Main(string[] args) {
MessageBox(IntPtr.Zero, "MyText", "MyCaption",
MessageBoxOptions.IconWarning | MessageBoxOptions.YesNoCancel | MessageBoxOptions.Help);
}

輸出結果

程式碼下載

TestWin32ApiMessageBox.rar

Link

MessageBox Function

http://www.dotblogs.com.tw/atowngit/archive/2009/08/30/10313.aspx

http://www.pinvoke.net/default.aspx/user32/MessageBox.html