USB轉Comport時 查DeviceID及佔用的Comport name

利用WQL查詢
位置：「root\\WMI」下的「MSSerial_PortName」
ManagementObjectSearcher searcher =
new ManagementObjectSearcher("root\\WMI",
"SELECT * FROM MSSerial_PortName");

MSSerial_PortName下有三個屬性
1.Active
2.InstanceName //即DeviceID
3.PortName //佔用的Port name

找USB插入的佔用的Port name
ManagementObjectSearcher searcher =
new ManagementObjectSearcher("root\\WMI",
"SELECT * FROM MSSerial_PortName Where InstanceName like '%VID_067B&PID_2303%'"); //這裡是利用Prolific做的驅動程式

foreach (ManagementObject queryObj in searcher.Get())
{
Console.WriteLine("-----------------------------------");
Console.WriteLine("MSSerial_PortName instance");
Console.WriteLine("Find Beacon at Port:{0}", queryObj["PortName"]);
Console.WriteLine("-----------------------------------");
}

p.s 在vista下 會因為UAC (User Account Control) 而會遇到Access Denied
解決方法
1.以 run as administrator 的方式執行就能動
2.到「控制台/使用者帳戶」 把UAC(使用者帳戶控制)關閉，就可以了
3.想要程式自動設好... 讓程式在Vista下 以「系統管理者」身份執行

Reference
1.A Useful WMI Tool & How To Find USB to Serial Adaptors
2.Vista 底下如何加入WMI provider dll?

利用WQL 找Windows裡相關資訊

先引用WQL所在的namespace
using System.Management; //要先在專案的參考加入System.Management


找Driver
public bool getDrivers()
{
ManagementScope scope = new ManagementScope(@"root\CIMV2");
ObjectQuery query = new ObjectQuery("WQL", "SELECT * FROM Win32_SystemDriver");
ManagementObjectSearcher search = new ManagementObjectSearcher(scope, query);
ManagementObjectCollection col = search.Get();

if (col.Count == 0)
{
return false;
}

Console.WriteLine("Win32_SystemDriver instance (Total Found:{0})", col.Count.ToString());
Console.WriteLine("-----------------------------------");
foreach (ManagementObject obj in col)
{
string driverlist = obj.ToString().ToUpper();
if (driverlist.Contains("SER2PL")) //此例是找SER2PL，更換你要的Driver Name
{
Console.WriteLine("找到Driver已安裝，Name: {0}", obj.ToString()); //name 是 Unique identifier for the service
return true;
}
/*
//印出所有屬性
foreach (PropertyData propertyData in obj.Properties)
{
ManagementBaseObject mbo = null;
if ((mbo = propertyData.Value as ManagementBaseObject) != null)
{
foreach (PropertyData prop in mbo.Properties)
Console.WriteLine("{0} - {1}", prop.Name, prop.Value);
}
}
* */
}
search.Dispose();
col.Dispose();

return false;
}

References:
可直接下拉查詢相關的資訊
WMI Code Creator v1.0