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    <p>The IWin32Window interface is a simple interface that only provides a <code>IntPtr</code> property named <code>Handle</code>. Feasibly something like this should work:</p> <pre><code>using System; using System.Runtime.InteropServices; using System.Windows.Forms; namespace SO_ToolTip { public partial class Form1 : Form { [DllImport("user32.dll")] public static extern IntPtr GetDesktopWindow(); public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { WindowWrapper windowWrapper = new WindowWrapper(GetDesktopWindow()); ToolTip toolTip = new ToolTip(); toolTip.Show("Blah blah... Blah blah... Blah blah...", windowWrapper, 1, 1, 10000); } } public class WindowWrapper : IWin32Window { public WindowWrapper(IntPtr handle) { Handle = handle; } public IntPtr Handle { get; protected set; } } } </code></pre> <p>But it doesn't. It complains about a NullReferenceException and I haven't debugged further. This does work:</p> <pre><code>... private void button1_Click(object sender, EventArgs e) { ToolTip toolTip = new ToolTip(); toolTip.Show("Blah blah... Blah blah... Blah blah...", this, 1, 1, 10000); } ... </code></pre> <p>Although the position is relative to the current form. Maybe that will get you going in the right direction.</p> <p><strong>Edit:</strong> Even this doesn't work so I'm not sure if it's an issue with WindowWrapper (how?) or what:</p> <pre><code>... private void button1_Click(object sender, EventArgs e) { WindowWrapper windowWrapper = new WindowWrapper(this.Handle); ToolTip toolTip = new ToolTip(); toolTip.Show("Blah blah... Blah blah... Blah blah...", windowWrapper, 1, 1, 10000); } ... </code></pre> <hr> <p><strong>Here you go,</strong> use a transparent, maximized form that you <code>BringToFront()</code> before showing the <code>ToolTip</code></p> <p><strong>Form1 Code:</strong></p> <pre><code>using System; using System.Windows.Forms; namespace SO_ToolTip { public partial class Form1 : Form { Random _Random = new Random(); ToolTip _ToolTip = new ToolTip(); public Form1() { InitializeComponent(); } private void timer1_Tick(object sender, EventArgs e) { BringToFront(); _ToolTip.Show("Blah blah... Blah blah... Blah blah...", this, _Random.Next(0, Width), _Random.Next(0, Height), 10000); } } } </code></pre> <p><strong>Form1 Designer Code:</strong> So you can see the forms properties:</p> <pre><code>namespace SO_ToolTip { partial class Form1 { /// &lt;summary&gt; /// Required designer variable. /// &lt;/summary&gt; private System.ComponentModel.IContainer components = null; /// &lt;summary&gt; /// Clean up any resources being used. /// &lt;/summary&gt; /// &lt;param name="disposing"&gt;true if managed resources should be disposed; otherwise, false.&lt;/param&gt; protected override void Dispose(bool disposing) { if (disposing &amp;&amp; (components != null)) { components.Dispose(); } base.Dispose(disposing); } #region Windows Form Designer generated code /// &lt;summary&gt; /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// &lt;/summary&gt; private void InitializeComponent() { this.components = new System.ComponentModel.Container(); this.timer1 = new System.Windows.Forms.Timer(this.components); this.SuspendLayout(); // // timer1 // this.timer1.Enabled = true; this.timer1.Interval = 1000; this.timer1.Tick += new System.EventHandler(this.timer1_Tick); // // Form1 // this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F); this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; this.ClientSize = new System.Drawing.Size(284, 264); this.ControlBox = false; this.MaximizeBox = false; this.MinimizeBox = false; this.Name = "Form1"; this.Opacity = 0; this.ShowIcon = false; this.ShowInTaskbar = false; this.WindowState = System.Windows.Forms.FormWindowState.Maximized; this.ResumeLayout(false); } #endregion private System.Windows.Forms.Timer timer1; } } </code></pre>
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    1. POCreating a tooltip from a system-tray only app
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    1. USCory Charlton
    1. USCory Charlton
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    1. COI don't think it's that complicated, I vaguely remember that you can get an IWin32Window from a form without implementing your own class.
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      1. USJohn Knoeller
    2. COCorrect, `Form` implements the `IWin32Window` interface, that's what happens when I pass `this` which is my Form1 object. The issue is that he wants to draw a tooltip anywhere on the screen (ie: to the desktop). Which by nature is just another window. I went the p/invoke route because I readily had a method to get the desktop handle.
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    3. COGot it. carry on ;)
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