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POWM_QUERYENDSESSION is causing me problems
 

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    <p>Making a simple application, so when the user logs out of Windows, it of course shuts the application down. We are making a simple USB Alert application which STOPS shutdown if a USB is detected when the user is logging off</p> <p>This is the code so far.</p> <pre><code>public Form1() { InitializeComponent(); } private static int WM_QUERYENDSESSION = 0x11; private static bool systemShutdown = false; protected override void WndProc(ref System.Windows.Forms.Message m) { if (m.Msg == WM_QUERYENDSESSION) { //MessageBox.Show("queryendsession: this is a logoff, shutdown, or reboot"); systemShutdown = true; m.Result = (IntPtr)0; } // If this is WM_QUERYENDSESSION, the closing event should be // raised in the base WndProc. m.Result = (IntPtr)0; base.WndProc(ref m); } //WndProc private void Form1_FormClosing(object sender, FormClosingEventArgs e) { if (systemShutdown) { systemShutdown = false; bool hasUSB = false; foreach (DriveInfo Drive in DriveInfo.GetDrives()) { if (Drive.DriveType == DriveType.Removable) { hasUSB = true; } } if (hasUSB) { e.Cancel = true; MessageBox.Show("You still have USB device plugged in, please unplug it and log off again"); } else { e.Cancel = false; } } } </code></pre> <p>What is happening is that the Windows Force Programs to Quit screen is being displayed, I read somewhere if you return 0 to WM_QUERYENDSESSION it does not display this, but it is still displaying this...</p> <p>Any ideas?</p> <p>EDIT:</p> <p>We used the code that someone responded with, but we are still getting this screen.</p> <p><img src="https://i.stack.imgur.com/KzwMo.png" alt="The screen we want to avoid!"></p>
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    1. COIs preventing the system from shutting down a good idea in the first place?
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    2. COBut we are building a program, that if a User has left a USB plugged it, they cannot shutdown or log off until they remove it.
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