C# Signature:
[DllImport("user32.dll", CharSet=CharSet.Auto)]
public static extern MessageBoxResult MessageBox(IntPtr hWnd, String text, String caption, int options);
uint range:0~6
VB Signature:
Imports System.Runtime.InteropServices
<DllImport("user32.dll", CharSet:=CharSet.Auto)> _
Shared Function MessageBox(ByVal hwnd As IntPtr, ByVal t As String, ByVal caption As String, ByVal t2 As MessageBoxOptions) As MessageBoxResult
End Function
C++ Signature:
[DllImport("user32.DLL", EntryPoint="MessageBox", SetLastError=true, CharSet=CharSet::Auto, CallingConvention=CallingConvention::StdCall)]
MessageBoxResult MessageBox(IntPtr hWnd, String^ Text, String^ Caption, MessageBoxOptions Options);
User-Defined Types:
/// <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
}
Notes:
None.
Tips & Tricks:
Input something
Sample Code C#:
using System;
using System.Runtime.InteropServices;
class Class1
{
[DllImport("user32.dll", CharSet=CharSet.Auto)]
static extern int MessageBox(IntPtr hWnd, String text, String caption, int options);
[STAThread]
static void Main(string[] args)
{
MessageBox(IntPtr.Zero, "Text", "Caption", 0);
}
}
Sample Code VB:
MessageBox(IntPtr.Zero, "Text", "Caption", MessageBoxOptions.Ok)
Sample Code C++:
MessageBox(IntPtr::Zero, "Text", "Caption", MessageBoxOptions::OkCancel | MessageBoxOptions::IconWarning);
Alternative Managed API:
System.Windows.Forms.MessageBox.Show
