The name 'WM_DEVICECHANGE' does not exist in the current context
c#, windows-messages
Solution
You have to declare and define the values of the constants:
private const int DBT_DEVICEARRIVAL = 0x8000;
private const int WM_DEVICECHANGE = 0x0219;
Problem
I am trying to detect a usb arrival event . I tried to override `wndproc()` for getting my messages. But I am facing an error by windows messages. The error is : ``` The name 'WM_DEVICECHANGE' does not exist in the current context The name 'DBT_DEVICEARRIVAL' does not exist in the current context ``` Also this is the code I am tried. ``` using System; using System.Collections.Generic; using System.Text; using System.Windows.Forms; using System.IO; using Microsoft.Win32.SafeHandles; namespace USBCheckerApp { public partial class Form1 : Form { bool bDeviceFound = false; public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { if (!bDeviceFound) { button1.Enabled = false; } } [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name = "FullTrust")] protected override void WndProc(ref Message m) { switch (m.Msg) { case WM_DEVICECHANGE: if (m.WParam == DBT_DEVICEARRIVAL) { MessageBox.Show("MEDIA FOUND"); } } } } } ``` Added so that you could suggest any updations in the same. Thanks