Hi,
I'm not sure whether you can do it in C#, i.e you have any direct classes
for this, but you have Win32 API's for detecting the cdroms insertions. The
following data may be helpful to you. Courtesy, MSDN
Detecting Media Insertion or Removal
Windows sends all top-level windows a set of default WM_DEVICECHANGE
messages when new devices or media (such as a CD or DVD) are added and become
available, and when existing devices or media are removed. You do not need to
register to receive these default messages. See the Remarks section in
RegisterDeviceNotification for details on which messages are sent by default.
The messages in the code example below are among the default messages.
Each WM_DEVICECHANGE message has an associated event that describes the
change, and a structure that provides detailed information about the change.
The structure consists of an event-independent header, DEV_BROADCAST_HDR,
followed by event-dependent members. The event-dependent members describe the
device to which the event applies. To use this structure, applications must
first determine the event type and the device type. Then, they can use the
correct structure to take appropriate action.
When the user inserts a new CD or DVD into a drive, applications receive a
WM_DEVICECHANGE message with a DBT_DEVICEARRIVAL event. The application must
check the event to ensure that the type of device arriving is a volume (the
dbch_devicetype member is DBT_DEVTYP_VOLUME) and that the change affects the
media (the dbcv_flags member is DBTF_MEDIA).
When the user removes a CD or DVD from a drive, applications receive a
WM_DEVICECHANGE message with a DBT_DEVICEREMOVECOMPLETE event. Again, the
application must check the event to ensure that the device being removed is a
volume and that the change affects the media.
The following code demonstrates how to check for insertion or removal of a
CD or DVD.
#include <windows.h>
#include <dbt.h>
void Main_OnDeviceChange (HWND hwnd, WPARAM wParam, LPARAM lParam);
char FirstDriveFromMask (ULONG unitmask); //prototype
/*------------------------------------------------------------------
Main_OnDeviceChange (hwnd, wParam, lParam)
Description
Handles WM_DEVICECHANGE messages sent to the application's
top-level window.
--------------------------------------------------------------------*/
void Main_OnDeviceChange (HWND hwnd, WPARAM wParam, LPARAM lParam)
{
PDEV_BROADCAST_HDR lpdb = (PDEV_BROADCAST_HDR)lParam;
char szMsg[80];
switch(wParam)
{
case DBT_DEVICEARRIVAL:
// Check whether a CD or DVD was inserted into a drive.
if (lpdb -> dbch_devicetype == DBT_DEVTYP_VOLUME)
{
PDEV_BROADCAST_VOLUME lpdbv = (PDEV_BROADCAST_VOLUME)lpdb;
if (lpdbv -> dbcv_flags & DBTF_MEDIA)
{
wsprintf (szMsg, "Drive %c: Media has arrived.\n",
FirstDriveFromMask(lpdbv ->dbcv_unitmask));
MessageBox (hwnd, szMsg, "WM_DEVICECHANGE", MB_OK);
}
}
break;
case DBT_DEVICEREMOVECOMPLETE:
// Check whether a CD or DVD was removed from a drive.
if (lpdb -> dbch_devicetype == DBT_DEVTYP_VOLUME)
{
PDEV_BROADCAST_VOLUME lpdbv = (PDEV_BROADCAST_VOLUME)lpdb;
if (lpdbv -> dbcv_flags & DBTF_MEDIA)
{
wsprintf (szMsg, "Drive %c: Media was removed.\n",
FirstDriveFromMask(lpdbv ->dbcv_unitmask));
MessageBox (hwnd, szMsg, "WM_DEVICECHANGE", MB_OK);
}
}
break;
default:
/*
Process other WM_DEVICECHANGE notifications for other
devices or reasons.
*/
;
}
}
/*------------------------------------------------------------------
FirstDriveFromMask (unitmask)
Description
Finds the first valid drive letter from a mask of drive letters.
The mask must be in the format bit 0 = A, bit 1 = B, bit 3 = C,
etc. A valid drive letter is defined when the corresponding bit
is set to 1.
Returns the first drive letter that was found.
--------------------------------------------------------------------*/
char FirstDriveFromMask (ULONG unitmask)
{
char i;
for (i = 0; i < 26; ++i)
{
if (unitmask & 0x1)
break;
unitmask = unitmask >> 1;
}
return (i + 'A');
}
Pradeep Kumar.R
"Paul Steele" wrote:
I am writing a C# app that needs to periodically poll for cdroms and usb
storage device insertions. I've looked at the WMI functions but haven't
found anything all that useful. The closest is Win32_DiskDrive, but it
doesn't seem to return any information on cdrom devices. I suspect there
might be a Win32 API call, but I haven't found any info yet using Google. Is
there a way to achieve this in C#?