private static string GetUSBInterfacePath(string systemDeviceInstanceID)
{
if (string.IsNullOrEmpty(systemDeviceInstanceID))
throw new ArgumentNullException("systemDeviceInstanceID");
IntPtr hdi = SetupApi.SetupDiGetClassDevs(GUID_DEVINTERFACE_USBPRINT, systemDeviceInstanceID, IntPtr.Zero,
SetupApi.DIGCF_PRESENT | SetupApi.DIGCF_DEVICEINTERFACE);
if (hdi.Equals(INVALID_HANDLE_VALUE)) throw new Win32Exception();
try
{
var device_data = new SetupApi.SP_DEVINFO_DATA();
device_data.cbSize = (uint) Marshal.SizeOf(typeof (SetupApi.SP_DEVINFO_DATA));
if (SetupApi.SetupDiEnumDeviceInfo(hdi, 0, ref device_data) == 0)
throw new Win32Exception(); // Only one device in the set
var interface_data = new SetupApi.SP_DEVICE_INTERFACE_DATA();
interface_data.cbSize = (uint) Marshal.SizeOf(typeof (SetupApi.SP_DEVICE_INTERFACE_DATA));
if (
SetupApi.SetupDiEnumDeviceInterfaces(hdi, ref device_data, GUID_DEVINTERFACE_USBPRINT, 0,
ref interface_data) == 0)
throw new Win32Exception(); // Only one interface in the set
// Get required buffer size
uint required_size = 0;
SetupApi.SetupDiGetDeviceInterfaceDetail(hdi, ref interface_data, IntPtr.Zero, 0, out required_size,
IntPtr.Zero);
int last_error_code = Marshal.GetLastWin32Error();
if (last_error_code != SetupApi.ERROR_INSUFFICIENT_BUFFER)
throw new Win32Exception(last_error_code);
IntPtr interface_detail_data = Marshal.AllocCoTaskMem((int) required_size);
try
{
switch (IntPtr.Size)
{
case 4:
Marshal.WriteInt32(interface_detail_data, 4 + Marshal.SystemDefaultCharSize);
break;
case 8:
Marshal.WriteInt32(interface_detail_data, 8);
break;
default:
throw new NotSupportedException("Architecture not supported.");
}
if (
SetupApi.SetupDiGetDeviceInterfaceDetail(hdi, ref interface_data, interface_detail_data,
required_size, out required_size, IntPtr.Zero) == 0)
throw new Win32Exception();
return
Marshal.PtrToStringAuto(
new IntPtr(interface_detail_data.ToInt64() +
Marshal.OffsetOf(typeof (SetupApi.SP_DEVICE_INTERFACE_DETAIL_DATA), "DevicePath")
.ToInt64()));
}
finally
{
Marshal.FreeCoTaskMem(interface_detail_data);
}
}
finally
{
SetupApi.SetupDiDestroyDeviceInfoList(hdi);
}
}
private static string GetPrinterParentDeviceId(string RegistryInstanceID)
{
if (string.IsNullOrEmpty(RegistryInstanceID)) throw new ArgumentNullException("RegistryInstanceID");
IntPtr hdi = SetupApi.SetupDiGetClassDevs(GUID_PRINTER_INSTALL_CLASS, RegistryInstanceID, IntPtr.Zero,
SetupApi.DIGCF_PRESENT);
if (hdi.Equals(INVALID_HANDLE_VALUE)) throw new Win32Exception();
try
{
var printer_data = new SetupApi.SP_DEVINFO_DATA();
printer_data.cbSize = (uint) Marshal.SizeOf(typeof (SetupApi.SP_DEVINFO_DATA));
if (SetupApi.SetupDiEnumDeviceInfo(hdi, 0, ref printer_data) == 0)
throw new Win32Exception(); // Only one device in the set
uint cmret = 0;
uint parent_devinst = 0;
cmret = Cfgmgr32.CM_Get_Parent(out parent_devinst, printer_data.DevInst, 0);
if (cmret != SetupApi.CR_SUCCESS)
throw new Exception(string.Format("Failed to get parent of the device '{0}'. Error code: 0x{1:X8}",
RegistryInstanceID, cmret));
uint parent_device_id_size = 0;
cmret = Cfgmgr32.CM_Get_Device_ID_Size(out parent_device_id_size, parent_devinst, 0);
if (cmret != SetupApi.CR_SUCCESS)
throw new Exception(
string.Format(
"Failed to get size of the device ID of the parent of the device '{0}'. Error code: 0x{1:X8}",
RegistryInstanceID, cmret));
parent_device_id_size++; // To include the null character
var parent_device_id = new string('\0', (int) parent_device_id_size);
cmret = Cfgmgr32.CM_Get_Device_ID(parent_devinst, parent_device_id, parent_device_id_size, 0);
if (cmret != SetupApi.CR_SUCCESS)
throw new Exception(
string.Format(
"Failed to get device ID of the parent of the device '{0}'. Error code: 0x{1:X8}",
RegistryInstanceID, cmret));
return parent_device_id;
}
catch (Exception e)
{
Global.Logger.Fatal(e.Message);
return "";
}
finally
{
SetupApi.SetupDiDestroyDeviceInfoList(hdi);
}
}