private static String GetDeviceRegistryProperty(IntPtr hDevInfo,
ref SetupApi.SP_DEVINFO_DATA deviceInfoData,
UInt32 property)
{
IntPtr dataType = IntPtr.Zero;
uint size;
StringBuilder buffer;
SetupApi.SetupDiGetDeviceRegistryProperty0(
hDevInfo,
ref deviceInfoData,
property,
out dataType,
null,
0,
out size);
if (size > 0)
{
buffer = new StringBuilder((int)size);
if (SetupApi.SetupDiGetDeviceRegistryProperty0(
hDevInfo,
ref deviceInfoData,
property,
null,
buffer,
size,
null))
{
return(buffer.ToString());
}
else
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
}
else
{
return(String.Empty);
}
}
public static NameValueCollection EnumDevices(bool PresentOnly, bool ZebraOnly, bool fullDetail)
{
NameValueCollection res = new NameValueCollection();
String name, path, desc, port;
Guid intfce;
IntPtr devs;
SetupApi.SP_DEVINFO_DATA devinfo = new SetupApi.SP_DEVINFO_DATA();
SetupApi.SP_DEVICE_INTERFACE_DATA devinterface = new SetupApi.SP_DEVICE_INTERFACE_DATA();
SetupApi.SP_DEVICE_INTERFACE_DETAIL_DATA interface_detail;
UInt32 devcount;
UInt32 size;
RegistryKey regKey, subKey;
intfce = GUID_DEVICEINTERFACE_USBPRINT;
UInt32 flags = SetupApi.DIGCF_DEVICEINTERFACE;
if (PresentOnly)
{
flags |= SetupApi.DIGCF_PRESENT;
}
devs = SetupApi.SetupDiGetClassDevs(ref intfce,
null,
IntPtr.Zero,
flags);
if (devs == (IntPtr)FileIO.INVALID_HANDLE_VALUE)
{
return(null);
}
devcount = 0;
devinterface.cbSize = Marshal.SizeOf(typeof(SetupApi.SP_DEVICE_INTERFACE_DATA));
while (SetupApi.SetupDiEnumDeviceInterfaces(
devs,
0,
ref intfce,
devcount,
ref devinterface))
{
devcount++;
SetupApi.SetupDiGetDeviceInterfaceDetail0(
devs,
ref devinterface,
null,
0,
out size,
null);
if ((size > 0) &&
(size <= (Marshal.SizeOf(typeof(SetupApi.SP_DEVICE_INTERFACE_DETAIL_DATA))) - sizeof(UInt32)))
{
interface_detail = new SetupApi.SP_DEVICE_INTERFACE_DETAIL_DATA();
interface_detail.cbSize = (UInt32)(sizeof(UInt32) + sizeof(Char)); // Wow! This is a gotcha!
devinfo = new SetupApi.SP_DEVINFO_DATA();
devinfo.cbSize = Marshal.SizeOf(typeof(SetupApi.SP_DEVINFO_DATA));
if (SetupApi.SetupDiGetDeviceInterfaceDetail0(
devs,
ref devinterface,
ref interface_detail,
size,
null,
ref devinfo))
{
path = interface_detail.devicePath.ToString();
name = GetDeviceRegistryProperty(devs, ref devinfo, SetupApi.SPDRP_LOCATION_INFORMATION);
if (fullDetail)
{
desc = "";
port = "";
if (path.StartsWith("\\\\?\\"))
{
string key = "##?#" + path.Substring(4);
try
{
regKey = Registry.LocalMachine.OpenSubKey("SYSTEM\\CurrentControlSet\\Control\\DeviceClasses\\" +
GUID_DEVICEINTERFACE_USBPRINT.ToString("B"));
try
{
subKey = regKey.OpenSubKey(key);
if (subKey != null)
{
subKey = subKey.OpenSubKey("#\\Device Parameters");
desc = subKey.GetValue("Port Description").ToString();
port = subKey.GetValue("Port Number").ToString();
subKey.Close();
}
}
finally
{
regKey.Close();
}
}
catch
{
// do nothing
}
}
if (ZebraOnly && (!desc.StartsWith("Zebra")))
{
continue;
}
res.Add(name, path);
res.Add(name, desc);
res.Add(name, port);
}
else
{
res.Add(name, path);
}
}
else
{
throw new Win32Exception(Marshal.GetLastWin32Error());
}
}
}
SetupApi.SetupDiDestroyDeviceInfoList(devs);
return(res);
}
