How can I get more information about the device when my Form Application receives the WM_DEVICECHANGE message with wParam set to DBT_DEVNODES_CHANGED and lParam set to zero.

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How can I get more information about the device when my Form Application receives the WM_DEVICECHANGE message with wParam set to DBT_DEVNODES_CHANGED and lParam set to zero? I just know MSDN says Applications that require more information should register for device notification using the RegisterDeviceNotification function.How can I work out this problem by using registerDeviceNotification or some other way.Can you give me some codes or tips.Thanks advancely.

Here are some code.

protected override void WndProc(ref Message m)
{
base.WndProc(ref m);
if (m.Msg == WM_DEVICECHANGE)
{
if (m.WParam.ToInt32() == DBT_DEVNODECHANGE)
{
if (test != null && test.IsAlive)
{
return;
}

Thread.Sleep(1000);
System.Windows.Forms.Control.CheckForIllegalCrossThreadCalls = false;
test = new Thread(new ThreadStart(this.startTest));
test.Start();
adbBtn.Enabled = false;
UartDebugBtn.Enabled = false;
SN.Text = "";
}
}
}

Posted 21-Jan-15 3:20am

Member 11175072

Updated 21-Jan-15 19:12pm

v2

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Richard MacCutchan · Answer 1 · 2015-01-21T04:32:00

Solution 1

As the documentation clearly states, you need to implement https://msdn.microsoft.com/en-us/library/windows/desktop/aa363431(v=vs.85).aspx[^].

Posted 21-Jan-15 4:32am

Richard MacCutchan

Comments

Member 11175072 21-Jan-15 21:28pm

I had read this article,it is written in C++ which is new to me,what's more,I can only receive the WM_DEVICECHANGE message with wParam set to DBT_DEVNODES_CHANGED and lParam set to zero,Can I get more infomation about the device by using DEV_BROADCAST_HDR structure and checking its dbch_devicetype member?.I want to be notified when the device was plugged out the PC.