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RogerB's MessageBoxEx from CODEPROJECT; an include-only extension for MessageBox, supporting a timeout timer
/*
* From author RogerB: https://www.codeproject.com/script/membership/view.aspx?mid=716667
* Code source article: https://www.codeproject.com/articles/7968/messagebox-with-a-timeout-for-net
* Licensing: https://www.codeproject.com/info/cpol10.aspx
*/
using System;
using System.Text;
using System.Runtime.InteropServices;
using System.Security.Permissions;
[assembly: SecurityPermission(SecurityAction.RequestMinimum, UnmanagedCode = true)]
namespace System.Windows.Forms
{
public class MessageBoxEx
{
public static DialogResult Show(string text, uint uTimeout)
{
Setup("", uTimeout);
return MessageBox.Show(text);
}
public static DialogResult Show(string text, string caption, uint uTimeout)
{
Setup(caption, uTimeout);
return MessageBox.Show(text, caption);
}
public static DialogResult Show(string text, string caption, MessageBoxButtons buttons, uint uTimeout)
{
Setup(caption, uTimeout);
return MessageBox.Show(text, caption, buttons);
}
public static DialogResult Show(string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, uint uTimeout)
{
Setup(caption, uTimeout);
return MessageBox.Show(text, caption, buttons, icon);
}
public static DialogResult Show(string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defButton, uint uTimeout)
{
Setup(caption, uTimeout);
return MessageBox.Show(text, caption, buttons, icon, defButton);
}
public static DialogResult Show(string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defButton, MessageBoxOptions options, uint uTimeout)
{
Setup(caption, uTimeout);
return MessageBox.Show(text, caption, buttons, icon, defButton, options);
}
public static DialogResult Show(IWin32Window owner, string text, uint uTimeout)
{
Setup("", uTimeout);
return MessageBox.Show(owner, text);
}
public static DialogResult Show(IWin32Window owner, string text, string caption, uint uTimeout)
{
Setup(caption, uTimeout);
return MessageBox.Show(owner, text, caption);
}
public static DialogResult Show(IWin32Window owner, string text, string caption, MessageBoxButtons buttons, uint uTimeout)
{
Setup(caption, uTimeout);
return MessageBox.Show(owner, text, caption, buttons);
}
public static DialogResult Show(IWin32Window owner, string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, uint uTimeout)
{
Setup(caption, uTimeout);
return MessageBox.Show(owner, text, caption, buttons, icon);
}
public static DialogResult Show(IWin32Window owner, string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defButton, uint uTimeout)
{
Setup(caption, uTimeout);
return MessageBox.Show(owner, text, caption, buttons, icon, defButton);
}
public static DialogResult Show(IWin32Window owner, string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defButton, MessageBoxOptions options, uint uTimeout)
{
Setup(caption, uTimeout);
return MessageBox.Show(owner, text, caption, buttons, icon, defButton, options);
}
public delegate IntPtr HookProc(int nCode, IntPtr wParam, IntPtr lParam);
public delegate void TimerProc(IntPtr hWnd, uint uMsg, UIntPtr nIDEvent, uint dwTime);
public const int WH_CALLWNDPROCRET = 12;
public const int WM_DESTROY = 0x0002;
public const int WM_INITDIALOG = 0x0110;
public const int WM_TIMER = 0x0113;
public const int WM_USER = 0x400;
public const int DM_GETDEFID = WM_USER + 0;
[DllImport("User32.dll")]
public static extern UIntPtr SetTimer(IntPtr hWnd, UIntPtr nIDEvent, uint uElapse, TimerProc lpTimerFunc);
[DllImport("User32.dll")]
public static extern IntPtr SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, IntPtr lParam);
[DllImport("user32.dll")]
public static extern IntPtr SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);
[DllImport("user32.dll")]
public static extern int UnhookWindowsHookEx(IntPtr idHook);
[DllImport("user32.dll")]
public static extern IntPtr CallNextHookEx(IntPtr idHook, int nCode, IntPtr wParam, IntPtr lParam);
[DllImport("user32.dll")]
public static extern int GetWindowTextLength(IntPtr hWnd);
[DllImport("user32.dll")]
public static extern int GetWindowText(IntPtr hWnd, StringBuilder text, int maxLength);
[DllImport("user32.dll")]
public static extern int EndDialog(IntPtr hDlg, IntPtr nResult);
[StructLayout(LayoutKind.Sequential)]
public struct CWPRETSTRUCT
{
public IntPtr lResult;
public IntPtr lParam;
public IntPtr wParam;
public uint message;
public IntPtr hwnd;
};
private const int TimerID = 42;
private static HookProc hookProc;
private static TimerProc hookTimer;
private static uint hookTimeout;
private static string hookCaption;
private static IntPtr hHook;
static MessageBoxEx()
{
hookProc = new HookProc(MessageBoxHookProc);
hookTimer = new TimerProc(MessageBoxTimerProc);
hookTimeout = 0;
hookCaption = null;
hHook = IntPtr.Zero;
}
private static void Setup(string caption, uint uTimeout)
{
if (hHook != IntPtr.Zero)
throw new NotSupportedException("multiple calls are not supported");
hookTimeout = uTimeout;
hookCaption = caption != null ? caption : "";
hHook = SetWindowsHookEx(WH_CALLWNDPROCRET, hookProc, IntPtr.Zero, AppDomain.GetCurrentThreadId());
}
private static IntPtr MessageBoxHookProc(int nCode, IntPtr wParam, IntPtr lParam)
{
if (nCode < 0)
return CallNextHookEx(hHook, nCode, wParam, lParam);
CWPRETSTRUCT msg = (CWPRETSTRUCT)Marshal.PtrToStructure(lParam, typeof(CWPRETSTRUCT));
IntPtr hook = hHook;
if (hookCaption != null && msg.message == WM_INITDIALOG)
{
int nLength = GetWindowTextLength(msg.hwnd);
StringBuilder text = new StringBuilder(nLength + 1);
GetWindowText(msg.hwnd, text, text.Capacity);
if (hookCaption == text.ToString())
{
hookCaption = null;
SetTimer(msg.hwnd, (UIntPtr)TimerID, hookTimeout, hookTimer);
UnhookWindowsHookEx(hHook);
hHook = IntPtr.Zero;
}
}
return CallNextHookEx(hook, nCode, wParam, lParam);
}
private static void MessageBoxTimerProc(IntPtr hWnd, uint uMsg, UIntPtr nIDEvent, uint dwTime)
{
if (nIDEvent == (UIntPtr)TimerID)
{
short dw = (short)SendMessage(hWnd, DM_GETDEFID, IntPtr.Zero, IntPtr.Zero);
EndDialog(hWnd, (IntPtr)dw);
}
}
}
}
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