Develop Reference

How to query GetMonitorBrightness from C#

How does GetMonitorBrightness http://msdn.microsoft.com/en-us/library/ms775205.aspx work? Can someone give me an actual working implementation calling this code in C#?
I'm trying to retrieve the allowed brightness levels my laptop supports.
I have the following working code that sets the brightness from 1 to ~150. But I'm looking for the allowed input values (min max values).
static void SetBrightness(byte targetBrightness)
{
ManagementScope scope = new ManagementScope("root\\WMI");
SelectQuery query = new SelectQuery("WmiMonitorBrightnessMethods");
using (ManagementObjectSearcher searcher = new ManagementObjectSearcher(scope, query))
{
using (ManagementObjectCollection objectCollection = searcher.Get())
{
foreach (ManagementObject mObj in objectCollection)
{
mObj.InvokeMethod("WmiSetBrightness",
new Object[] { UInt32.MaxValue, targetBrightness });
break;
}
}
}
}

While using Interop should be possible this function is also available through WMI. Changing my original code a bit resulted in the following code that should work:
ManagementScope scope;
SelectQuery query;
scope = new ManagementScope("root\\WMI");
query = new SelectQuery("SELECT * FROM WmiMonitorBrightness");
using (ManagementObjectSearcher searcher = new ManagementObjectSearcher(scope, query))
{
using (ManagementObjectCollection objectCollection = searcher.Get())
{
foreach (ManagementObject mObj in objectCollection)
{
Console.WriteLine(mObj.ClassPath);
foreach (var item in mObj.Properties)
{
Console.WriteLine(item.Name + " " +item.Value.ToString());
if(item.Name =="CurrentBrightness")
//Do something with CurrentBrightness
}
}
}
}
Now I'm really curious how to handle 'special' cases like non laptop Screen's and if they implement any way to influence brightness.

The function has an output of the minimum and maximum values:
LPDWORD pdwMinimumBrightness=NULL;
LPDWORD pdwMaximumBrightness=NULL;
HANDLE pmh = pPhysicalMonitors[0].hPhysicalMonitor;
GetMonitorBrightness(pmh, pdwMinimumBrightness, pdwMaximumBrightness);
This is assuming that you want the values for the first monitor.

How to get connection name used by the Windows Network adapter?

Is it possible get it using WMI query?
my current code:
ManagementObjectSearcher searcher = new ManagementObjectSearcher(
"SELECT * FROM Win32_NetworkAdapte");
foreach (ManagementObject queryObj in searcher.Get())
{
Console.WriteLine(queryObj[??]);
}
I'm tried get the connections name from:
Control Panel \ Network and Internet \ Network Connections

Using code below you would be able dump all properties of the Network Adapter, you need Name property:
ManagementObjectSearcher searcher = new ManagementObjectSearcher(
"SELECT * FROM Win32_NetworkAdapter");
foreach (ManagementObject adapter in searcher.Get())
{
StringBuilder propertiesDump = new StringBuilder();
foreach (var property in adapter.Properties)
{
propertiesDump.AppendFormat(
"{0} == {1}{2}",
property.Name,
property.Value,
Environment.NewLine);
}
}
OR simply using LINQ (add using System.Linq):
foreach (ManagementObject adapter in searcher.Get())
{
string adapterName = adapter.Properties
.Cast<PropertyData>()
.Single(p => p.Name == "Name")
.Value.ToString();
}
PS: Also be aware you've typo in WMI query - forgot r in Adapter: Win32_NetworkAdapte_r_

Let's change the code a little more and shorten it. ManagementClass class shortens the WMI query.
ManagementClass mc = new ManagementClass("Win32_NetworkAdapter");
ManagementObjectCollection results = mc.GetInstances();
foreach (var result in results)
{
foreach (PropertyData data in result.Properties)
Console.WriteLine($"{data.Name} == {data.Value}");
}

WMI turn off disks

I want to turn off disks (WMI). So far, I have the following code:
ManagementScope scope = new ManagementScope("\\\\.\\ROOT\\cimv2");
ObjectQuery query = new ObjectQuery("SELECT * FROM CIM_DiskDrive");
//create object searcher
ManagementObjectSearcher searcher =
new ManagementObjectSearcher(scope, query);
ManagementObjectCollection queryCollection = searcher.Get();
//enumerate the collection.
foreach (ManagementObject m in queryCollection)
{
Console.WriteLine("in set power state for: " + m.Path);
ManagementOperationObserver obs = new ManagementOperationObserver();
obs.Progress += new ProgressEventHandler(obs_Progress);
obs.Completed += new CompletedEventHandler(obs_Completed);
m.InvokeMethod(obs, "SetPowerState", new object[]{"7"});
}
however, disk activity keeps on happening. Any ideas on what is going on will be appreciated.

SetPowerState is not implemented by WMI:
http://msdn.microsoft.com/en-us/library/aa387254(v=VS.85).aspx
checking CompletedEventArgs.Status will also return MethodNotImplemented telling us that this is the case. If you want to use that method you must implement your own provider.

How can I get the date and version of drivers in C#?

This is my code, I can get name, description...
ManagementClass MgmtClass = new ManagementClass("Win32_SystemDriver");
foreach (ManagementObject mo in MgmtClass.GetInstances())
{
name=mo["Name"];
Dis=mo["Description"];
...
}
How can I get the date and version of drivers?

You should start from researching Win32_PnPSignedDriver Class and Win32_PnPEntity Class
EXAMPLE
ManagementObjectSearcher searcher =
new ManagementObjectSearcher("root\\CIMV2",
"SELECT * FROM Win32_PnPSignedDriver");
ManagementObjectCollection moc = searcher.Get();
foreach (var manObj in moc)
{
Console.WriteLine("Device Name: {0}\r\nDeviceID: {1}\r\nDriverDate: {2}\r\nDriverVersion: {3}\r\n==============================\r\n", manObj["FriendlyName"], manObj["DeviceID"], manObj["DriverDate"], manObj["DriverVersion"]);
}

Returning mounted drives on server in WQL

I am trying create a simple WQL query where I only return mounted drives on a server. These are drives that do not have a drive letter associated with them.
I tried the following sytnax and it does not return a result set:
SELECT * FROM Win32_Volume WHERE DriveLetter = ""
Here is the complete code sample in C#:
string ManagementPath = string.Format(#"\\{0}\root\CIMV2", txtServerName.Text);
ConnectionOptions DriveConnOptions = new ConnectionOptions();
ObjectQuery oq = new ObjectQuery(#"SELECT * FROM Win32_Volume WHERE DriveLetter = """"");
ManagementScope Scope = new ManagementScope(ManagementPath, DriveConnOptions);
ManagementObjectSearcher Searcher = new ManagementObjectSearcher(Scope, oq);
ManagementObjectCollection collection = Searcher.Get();
foreach (ManagementObject mo in collection)
{
//do something...
}

I need to change my WQL statement to:
SELECT * FROM Win32_Volume WHERE DriveLetter IS NULL