我想检测USB到达事件。 我试图重写wndproc()
用于获取我的消息。 但我面临着Windows消息的错误。
错误是:
The name 'WM_DEVICECHANGE' does not exist in the current context
The name 'DBT_DEVICEARRIVAL' does not exist in the current context
另外这是我试过的代码。
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");
}
}
}
}
}
新增所以,你可以建议在同任何updations。 谢谢