public static bool GetDevicesOfCat(Guid cat, out ArrayList devs)
{
devs = null;
int hr;
object comObj = null;
ICreateDevEnum enumDev = null;
IEnumMoniker enumMon = null;
IMoniker[] mon = new IMoniker[1];
try
{
Type srvType = Type.GetTypeFromCLSID(Clsid.SystemDeviceEnum);
if (srvType == null)
throw new NotImplementedException("System Device Enumerator");
comObj = Activator.CreateInstance(srvType);
enumDev = (ICreateDevEnum)comObj;
hr = enumDev.CreateClassEnumerator(ref cat, out enumMon, 0);
if (hr != 0)
throw new NotSupportedException("No devices of the category");
int count = 0;
IntPtr f = IntPtr.Zero;
do
{
hr = enumMon.Next(1, mon, f);
if ((hr != 0) || (mon[0] == null))
break;
DsDevice dev = new DsDevice();
dev.Name = GetFriendlyName(mon[0]);
if (devs == null)
devs = new ArrayList();
dev.Mon = mon[0]; mon[0] = null;
devs.Add(dev); dev = null;
count++;
}
while (true);
return count > 0;
}
catch (Exception)
{
if (devs != null)
{
foreach (DsDevice d in devs)
d.Dispose();
devs = null;
}
return false;
}
finally
{
enumDev = null;
if (mon[0] != null)
Marshal.ReleaseComObject(mon[0]); mon[0] = null;
if (enumMon != null)
Marshal.ReleaseComObject(enumMon); enumMon = null;
if (comObj != null)
Marshal.ReleaseComObject(comObj); comObj = null;
}
}
private void okButton_Click(object sender, EventArgs e)
{
if (deviceListVw.SelectedItems.Count != 1)
return;
ListViewItem selitem = deviceListVw.SelectedItems[0];
SelectedDevice = selitem.Tag as DsDevice;
Close();
}
public static bool GetDevicesOfCat(Guid cat, out ArrayList devs)
{
devs = null;
int hr;
object comObj = null;
ICreateDevEnum enumDev = null;
IEnumMoniker enumMon = null;
IMoniker[] mon = new IMoniker[1];
try
{
Type srvType = Type.GetTypeFromCLSID(Clsid.SystemDeviceEnum);
if (srvType == null)
{
throw new NotImplementedException("System Device Enumerator");
}
comObj = Activator.CreateInstance(srvType);
enumDev = (ICreateDevEnum)comObj;
hr = enumDev.CreateClassEnumerator(ref cat, out enumMon, 0);
if (hr != 0)
{
throw new NotSupportedException("No devices of the category");
}
int count = 0;
IntPtr f = IntPtr.Zero;
do
{
hr = enumMon.Next(1, mon, f);
if ((hr != 0) || (mon[0] == null))
{
break;
}
DsDevice dev = new DsDevice();
dev.Name = GetFriendlyName(mon[0]);
if (devs == null)
{
devs = new ArrayList();
}
dev.Mon = mon[0]; mon[0] = null;
devs.Add(dev); dev = null;
count++;
}while (true);
return(count > 0);
}
catch (Exception)
{
if (devs != null)
{
foreach (DsDevice d in devs)
{
d.Dispose();
}
devs = null;
}
return(false);
}
finally
{
enumDev = null;
if (mon[0] != null)
{
Marshal.ReleaseComObject(mon[0]);
}
mon[0] = null;
if (enumMon != null)
{
Marshal.ReleaseComObject(enumMon);
}
enumMon = null;
if (comObj != null)
{
Marshal.ReleaseComObject(comObj);
}
comObj = null;
}
}
