Hello

.gitignore

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+/.vs/
+/bin/
+/obj/

App.config

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+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+    <startup> 
+
+    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5"/></startup>
+</configuration>

Program.cs

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+using System;
+using System.Windows.Forms;
+using System.Threading;
+using System.Drawing;
+using System.Net;
+using System.Text;
+using System.Collections.Generic;
+using System.IO;
+
+namespace TrayIconForDiscordWeb {
+	static class Program {
+        static Dictionary<string, Icon> icons = new Dictionary<string, Icon>();
+        static Icon defaultIcon;
+
+        static NotifyIcon trayIcon;
+
+        static HttpListener server;
+        static Thread httpThread;
+
+        static void httpThreadFunc() {
+            var currIcon = defaultIcon;
+
+            server = new HttpListener();
+            server.Prefixes.Add("http://127.0.0.1:15341/");
+            server.Start();
+
+            for (;;) {
+                var context = server.GetContext();
+                var response = context.Response;
+                response.Headers.Add("Access-Control-Allow-Origin", "*");
+
+                var path = context.Request.Url.LocalPath;
+                string reply = "";
+                if (path != null && path.StartsWith("/set-status/")) {
+                    var name = path.Substring("/set-status/".Length);
+                    Icon newIcon;
+                    if (icons.TryGetValue(name, out newIcon)) {
+                        // OK!
+                    } else if (name.EndsWith("+") && icons.TryGetValue(name.Substring(0, name.Length - 1), out newIcon)) {
+                        // OK!
+                    } else newIcon = defaultIcon;
+                    if (newIcon != currIcon) {
+                        currIcon = newIcon;
+                        trayIcon.Icon = newIcon;
+                    }
+                    reply = "OK!";
+                } else {
+                    response.StatusCode = 404;
+                }
+
+                var buffer = Encoding.UTF8.GetBytes(reply);
+                response.ContentLength64 = buffer.Length;
+                var st = response.OutputStream;
+                st.Write(buffer, 0, buffer.Length);
+                context.Response.Close();
+            }
+        }
+
+        static void onExit(object sender, EventArgs e) {
+            server.Stop();
+            httpThread.Abort();
+            Application.Exit();
+        }
+
+        [STAThread]
+		static void Main() {
+			Application.EnableVisualStyles();
+			Application.SetCompatibleTextRenderingDefault(false);
+
+            try {
+                foreach (var file in (new DirectoryInfo("Icons")).EnumerateFiles("*.ico")) {
+                    var name = Path.GetFileNameWithoutExtension(file.Name);
+                    icons[name] = Icon.ExtractAssociatedIcon(file.FullName);
+                }
+                defaultIcon = icons["default"];
+            } catch (Exception e) {
+                MessageBox.Show("Failed to enumerate icons:\n" + e.ToString(), "Uh oh", MessageBoxButtons.OK, MessageBoxIcon.Error);
+                return;
+			}
+
+            trayIcon = new NotifyIcon();
+            trayIcon.Text = "Tray Icon for Discord Web\nDouble-click to exit.";
+            trayIcon.Icon = defaultIcon;
+            trayIcon.Visible = true;
+            trayIcon.DoubleClick += new EventHandler(onExit);
+
+            httpThread = new Thread(new ThreadStart(httpThreadFunc));
+            httpThread.Start();
+
+			Application.Run();
+		}
+	}
+}

Properties/AssemblyInfo.cs

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+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("TrayIconForDiscordWeb")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("TrayIconForDiscordWeb")]
+[assembly: AssemblyCopyright("Copyright ©  2022")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible
+// to COM components.  If you need to access a type in this assembly from
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("934ad510-7841-43e9-ac67-f83d270ffcf5")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

Properties/Resources.resx

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+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+    
+    Version 2.0
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+    
+    Example:
+    
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+                
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+    
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+</root>

Properties/Settings.settings

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+<?xml version='1.0' encoding='utf-8'?>
+<SettingsFile xmlns="http://schemas.microsoft.com/VisualStudio/2004/01/settings" CurrentProfile="(Default)">
+  <Profiles>
+    <Profile Name="(Default)" />
+  </Profiles>
+  <Settings />
+</SettingsFile>