I've been doing lots of research on controlling USB devices in C# and ran across a few tutorials that seemed good until I started trying to code them. It seems like everyone seems to know how to use the function RegisterDeviceN otification to register the form to recieve WM_DEVICECHANGE messages.
I've gotten as far as importing the function from user32.dll and setting up the device filtering, but I don't really understand the concept of using RegisterDeviceN otification. Can anyone clarify what and where to get the parameters that its asking for?
Here is my code so far: -
using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Data;
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using System.Drawing;
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using System.Text;
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using System.Windows.Forms;
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using System.Windows;
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using System.Runtime.InteropServices;
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using DeviceManagementDeclarations;
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-
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namespace USBDevice
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{
-
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public partial class Form1 : Form
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{
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public const int WM_DEVICECHANGE = 0x219;
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public Form1()
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{
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InitializeComponent();
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RegisterDeviceNotification(this.Handle, ?NotificationFilter?, ?Flags?);
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}
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protected override void WndProc(ref Message m)
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{
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switch (m.Msg)
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{
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case WM_DEVICECHANGE:
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{
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MessageBox.Show(m.ToString());
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break;
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}
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}
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base.WndProc(ref m);
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}
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[DllImport("user32.dll", CharSet = CharSet.Auto)]
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static public extern IntPtr RegisterDeviceNotification(IntPtr hRecipient, IntPtr NotificationFilter, int Flags);
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}
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}
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5 13336 Plater 7,872
Recognized Expert Expert
Hmm, I was pretty sure I got that notification just fine without doing any registering.
I will check though.
EDIT:
Just checked, yup I get that message regardless of focus or anything and I didn't need to register for it.
Huh... well I feel stupid. How come all these tutorials make out that you have to register the device notification?
I think last time I had it compilable I was using a different filter for the message. Thanks for the clear-up tho!
Plater 7,872
Recognized Expert Expert
I should alert you that DeviceNotify isn't as usefull as you would hope. I only found it really usefull for when a USB->SerialPort was added/removed, or some kind of mass storage usb device was added/removed (i.e. thumbdrive, external harddrive, etc)
I've been doing the same (some research on monitoring added/removed of mass storage device in C# ) but sa new in C# I don't know what to do!
Could you clarify it or post you Code?
Plater 7,872
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