Detect CD-ROM

[Hayato Iriumi]

Hello,
I'm trying to find a way to detect whether CD-ROM was inserted into the
CD-ROM drive using C#. Does anyone have any idea how to do this? WMI? Win32
API?

TIA

 

[Tony]

I cant help on this, but am looking for similar information......

I am trying to do something similar, but would also like to know if the cd
drive is writeable and has writeable media loaded.
The same goes for a floppy drive - seeing if a disk is loaded and the disk
is not write protected

Tony

 

[Daniel O'Connell]

Intersting problem, not sure about how to determine when a disc is inserted,
but I am working on a lower level piece of code(which will be written in
MC++) that will query cdrom media properties(writeability, etc) which should
be done in a day or so. If no one posts an answer I can post the resultant
code when its complete.

 

[Willy Denoyette [MVP]]

Here's how you can do it using System.Management classes (and WMI).

// This code demonstrates how to monitor the CDROM device loading
using System;
using System.ComponentModel;
using System.Runtime.InteropServices;
using System.Management;
class WMIEvent {
public static void Main() {
WMIEvent we = new WMIEvent();
ManagementEventWatcher w= null;
WqlEventQuery q;
ManagementOperationObserver observer = new ManagementOperationObserver();
// Bind to local machine
ManagementScope scope = new ManagementScope("root\\CIMV2");
scope.Options.EnablePrivileges = true; //sets required privilege
try {
q = new WqlEventQuery();
q.EventClassName = "__InstanceModificationEvent";
q.WithinInterval = new TimeSpan(0,0,15);
// DriveType - 5: CDROM
q.Condition = @"TargetInstance ISA 'Win32_LogicalDisk' and
TargetInstance.DriveType = 5";
Console.WriteLine(q.QueryString);
w = new ManagementEventWatcher(scope, q);
// register async. event handler
w.EventArrived += new EventArrivedEventHandler(we.CDREventArrived);
w.Start();
// Do something usefull,block thread for testing
Console.ReadLine();
}
catch(Exception e) {
Console.WriteLine(e.Message);
}
finally {
w.Stop();
}
}
// Dump all properties
public void CDREventArrived(object sender, EventArrivedEventArgs e) {
//Get the Event object and display it
PropertyData pd;
if(( pd = e.NewEvent.Properties["TargetInstance"]) != null)
{
ManagementBaseObject mbo = pd.Value as ManagementBaseObject;
// if CD removed VolumeName == null
if(mbo.Properties["VolumeName"].Value != null)
Console.WriteLine(mbo.Properties["VolumeName"].Value);
}
}
}

Willy.

 

[Hayato Iriumi]

This is great, but it only works when user inserts or ejects the CD-ROM?
Is there any way to check whether the CD-ROM is already in CD Drive or
not?

 

[Willy Denoyette [MVP]]

Try this:

using System;
using System.Management;
class App {
public static void Main() {
SelectQuery query = new SelectQuery("select volumename, volumeserialnumber
from win32_logicaldisk where drivetype=5");
ManagementObjectSearcher searcher = new ManagementObjectSearcher(query);
foreach (ManagementObject mo in searcher.Get()) {
// If both properties are null I suppose there's no CD
if((mo["volumename"] != null) || (mo["volumeserialnumber"] != null))
Console.WriteLine("{0} - {1} ",mo["volumename"],
mo["volumeserialnumber"]);
else
Console.WriteLine("No CD");

}
}
}

Willy.

 

[Hayato Iriumi]

Hello, Willy.
Wow, you're amazing. Thank you very much for the code. I really
appreciate it.

 

[Guest]

Any idea why this code won't run in a service? Runs well in a console app but comes up with null volumename and volumeserialnumber in a service

TIA

John Hoffma

----- Willy Denoyette [MVP] wrote: ----

Try this

using System
using System.Management
class App
public static void Main()
SelectQuery query = new SelectQuery("select volumename, volumeserialnumbe
from win32_logicaldisk where drivetype=5")
ManagementObjectSearcher searcher = new ManagementObjectSearcher(query)
foreach (ManagementObject mo in searcher.Get())
// If both properties are null I suppose there's no C
if((mo["volumename"] != null) || (mo["volumeserialnumber"] != null)
Console.WriteLine("{0} - {1} ",mo["volumename"]
mo["volumeserialnumber"])
els
Console.WriteLine("No CD")





Willy