Added "MessageBox Center Parent" class

EncryptPad/MsgBoxCenterParent.cs

@@ -0,0 +1,63 @@
+using System;
+using System.Text;
+using System.Drawing;
+using System.Windows.Forms;
+using System.Runtime.InteropServices;
+
+class CenterWinDialog : IDisposable
+{
+    private int mTries = 0;
+    private Form mOwner;
+
+    public CenterWinDialog(Form owner)
+    {
+        mOwner = owner;
+        owner.BeginInvoke(new MethodInvoker(findDialog));
+    }
+
+    private void findDialog()
+    {
+        // Enumerate windows to find the message box
+        if (mTries < 0) return;
+        EnumThreadWndProc callback = new EnumThreadWndProc(checkWindow);
+        if (EnumThreadWindows(GetCurrentThreadId(), callback, IntPtr.Zero))
+        {
+            if (++mTries < 10) mOwner.BeginInvoke(new MethodInvoker(findDialog));
+        }
+    }
+    private bool checkWindow(IntPtr hWnd, IntPtr lp)
+    {
+        // Checks if <hWnd> is a dialog
+        StringBuilder sb = new StringBuilder(260);
+        GetClassName(hWnd, sb, sb.Capacity);
+        if (sb.ToString() != "#32770") return true;
+        // Got it
+        Rectangle frmRect = new Rectangle(mOwner.Location, mOwner.Size);
+        RECT dlgRect;
+        GetWindowRect(hWnd, out dlgRect);
+        MoveWindow(hWnd,
+            frmRect.Left + (frmRect.Width - dlgRect.Right + dlgRect.Left) / 2,
+            frmRect.Top + (frmRect.Height - dlgRect.Bottom + dlgRect.Top) / 2,
+            dlgRect.Right - dlgRect.Left,
+            dlgRect.Bottom - dlgRect.Top, true);
+        return false;
+    }
+    public void Dispose()
+    {
+        mTries = -1;
+    }
+
+    // P/Invoke declarations
+    private delegate bool EnumThreadWndProc(IntPtr hWnd, IntPtr lp);
+    [DllImport("user32.dll")]
+    private static extern bool EnumThreadWindows(int tid, EnumThreadWndProc callback, IntPtr lp);
+    [DllImport("kernel32.dll")]
+    private static extern int GetCurrentThreadId();
+    [DllImport("user32.dll")]
+    private static extern int GetClassName(IntPtr hWnd, StringBuilder buffer, int buflen);
+    [DllImport("user32.dll")]
+    private static extern bool GetWindowRect(IntPtr hWnd, out RECT rc);
+    [DllImport("user32.dll")]
+    private static extern bool MoveWindow(IntPtr hWnd, int x, int y, int w, int h, bool repaint);
+    private struct RECT { public int Left; public int Top; public int Right; public int Bottom; }
+}