Get Devpkey_Device_Busreporteddevicedesc from Win32_Pnpentity in C#
I'm Trying to Get the Bus Reported Device Description from a Usb Com Port in Our Wpf Application. Found a Powershell Script That Gives Exacly That, but as Not...
I'm trying to get the bus reported device description from a usb com port in our WPF application. Found a powershell script that gives exacly that, but as not every user has permission to run powershell, so using PowerShell.Create() is sadly not an option.
(Get-WMIObject Win32_PnPEntity | where {$_.name -match "\(com*"}).GetDeviceProperties("DEVPKEY_Device_BusReportedDeviceDesc").DeviceProperties.Data
I have tried below combinations, but I either get "Unable to cast object of type 'System.String' to type 'System.Array'" or "Invalid method Parameter(s)" on InvokeMethod.
using System;
using System.Management;
ManagementClass oClass = new ManagementClass("Win32_PnPEntity");
Object[] single = { "DEVPKEY_Device_BusReportedDeviceDesc" };
Array arr = (Array)new string[] { "DEVPKEY_Device_BusReportedDeviceDesc" };
Object[] singleArr = { single };
Object[] objsArr = { arr };
ManagementBaseObject inParams = oClass.GetMethodParameters("GetDeviceProperties");
inParams["devicePropertyKeys"] = single;
//inParams["devicePropertyKeys"] = arr;
//inParams["devicePropertyKeys"] = singleArr;
//inParams["devicePropertyKeys"] = objsArr;
oClass.InvokeMethod("GetDeviceProperties", single);
//oClass.InvokeMethod("GetDeviceProperties", singleArr);
//oClass.InvokeMethod("GetDeviceProperties", objsArr);
//oClass.InvokeMethod("GetDeviceProperties", inParams, null);
Everything takes place on the local machine.
Also found an answer from vromanov How to get Bus Reported Device Description using C# and it works, but seems like an overkill solution
1 Answer
The GetDeviceProperties method is documented like this:
Uint32 GetDeviceProperties(
[in, optional] string devicePropertyKeys[],
[out] Win32_PnPDeviceProperty deviceProperties[]
);
So here is a sample code to call it with C#:
foreach (var mo in new ManagementObjectSearcher(null, "SELECT * FROM Win32_PnPEntity").Get().OfType<ManagementObject>())
{
// get the name so we can do some tests on the name in this case
var name = mo["Name"] as string;
// add your custom test here
if (name == null || name.IndexOf("(co", StringComparison.OrdinalIgnoreCase) < 0)
continue;
// call Win32_PnPEntity's 'GetDeviceProperties' method
// prepare two arguments:
// 1st one is an array of string (or null)
// 2nd one will be filled on return (it's an array of ManagementBaseObject)
var args = new object[] { new string[] { "DEVPKEY_Device_BusReportedDeviceDesc" }, null };
mo.InvokeMethod("GetDeviceProperties", args);
// one mbo for each device property key
var mbos = (ManagementBaseObject[])args[1];
if (mbos.Length > 0)
{
// get value of property named "Data"
// not all objects have that so we enum all props here
var data = mbos[0].Properties.OfType<PropertyData>().FirstOrDefault(p => p.Name == "Data");
if (data != null)
{
Console.WriteLine(data.Value);
}
}
}
James Sterling reports on renewable energy developments, climate policy, ecological conservation, and green tech innovations around the globe.
