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POWinforms: Attempted to read or write protected memory. This is often an indication that other memory is corrupt
 

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  1. POWinforms: Attempted to read or write protected memory. This is often an indication that other memory is corrupt
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    <p>I have a bunch of background events.</p> <p>All of them call a log:</p> <pre><code>private void log(string text, params object[] values) { if (editLog.InvokeRequired) { editLog.BeginInvoke( (MethodInvoker)delegate { this.log(text, values); }); } else { text = string.Format(text, values) + Environment.NewLine; lock (editLog) { editLog.AppendText(text); editLog.SelectionStart = editLog.TextLength; editLog.ScrollToCaret(); } } } </code></pre> <p>Sometimes I get this, but other times not:</p> <pre><code>System.AccessViolationException was unhandled Message=Attempted to read or write protected memory. This is often an indication that other memory is corrupt. Source=System.Windows.Forms StackTrace: at System.Windows.Forms.UnsafeNativeMethods.CallWindowProc(IntPtr wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam) at System.Windows.Forms.NativeWindow.DefWndProc(Message&amp; m) at System.Windows.Forms.Control.WndProc(Message&amp; m) at System.Windows.Forms.RichTextBox.WndProc(Message&amp; m) at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) at System.Windows.Forms.UnsafeNativeMethods.SendMessage(HandleRef hWnd, Int32 msg, Int32 wParam, Object&amp; editOle) at System.Windows.Forms.TextBoxBase.ScrollToCaret() at Program1.frmMain.log(String text, Object[] values) in ... ... ... </code></pre> <p>P.D: Not always stop at this line, randomly will be one of the three times editLog methods/properties are used. Not always a exception is throw. Sometimes look like the thing freeze. But not the main UI, just the flow of messages (ie: log look like is never called again)</p> <p>The app is a single form, with background process. I can't see what I doing wrong with this...</p> <p><strong>UPDATE</strong>:</p> <p>I do the suggestion of Mangist, this is the code (the timer fire at 100ms). Same result:</p> <pre><code>private Queue&lt;String&gt; logs = new Queue&lt;String&gt;(); private void timerLog_Tick(object sender, EventArgs e) { lock (logs) { for (int i = 0; i &lt; logs.Count; i++) { editLog.AppendText(logs.Dequeue()); editLog.SelectionStart = editLog.TextLength; editLog.ScrollToCaret(); } } } private void log(string text, params object[] values) { text = string.Format(text, values) + Environment.NewLine; if (editLog.InvokeRequired) { editLog.BeginInvoke( (MethodInvoker)delegate { lock (logs) { logs.Enqueue(text); } //this.log(text, values); }); } else { logs.Enqueue(text); } } </code></pre>
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    1. COWhat is the purpose of locking a control in the UI thread? You are already guaranteed single thread access by the message pump.
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    2. COWell, that lock was pure guess in my part...
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      1. USmamcx
    3. COAsa general rule: *never* lock a real object (eg. `this`). Always use a `new object()` member just for locking. See [Why the Great Idea isn't So Great](http://msdn.microsoft.com/en-us/magazine/cc188793.aspx#S7)
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      1. USRemus Rusanu
 

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