Exemplos de classe WMI

Os exemplos a seguir mostram definições de classe do esquema de um driver de porta serial. Note that the guid values shown in these examples are placeholders. Cada definição de classe deve ter um GUID exclusivo gerado por guidgen.exe ou uuidgen.exe (que estão incluídos no SDK do Microsoft Windows).

// Standard class for reporting serial port information
// Class qualifiers 
[WMI, guid("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"),
Dynamic, Provider("WMIProv"),
WmiExpense(1),
Locale("MS\\0x409"),
Description("Description of class"]
 
//Class name 
class Vendor_SerialInfo {
 
//Required items 
    [key, read] 
     string InstanceName;
    [read]
     boolean Active;
 
// Bytes sent on port
// Property qualifiers 
    [read,
     WmiDataId(1),
     WmiScale(0),
     WmiComplexity(1),
     WmiVolatility(1000)]
     Description("Description of property")]
// Data item 
     uint64 BytesSent;
 
// Bytes received on port
    [read,
     write,
     WmiDataId(2),
     WmiScale(0), 
     WmiVolatility(1000)]
     uint64 BytesReceived;
 
// Who owns the port 
    [read,
     WmiDataId(4),
     WmiScale(0),              
     WmiVolatility(60000)] 
    string Owner;
 
// Status bit array
    [read, write,
     WmiDataId(3),
     WmiScale(0)]
     byte Status[16];
 
//The number of items in the XmitBufferSize array
    [read,
     WmiDataId(5),
     WmiScale(0),
     WmiComplexity(1),
     WmiVolatility(1000)]
     uint32 XmitDescriptorCount;       
 
//Array of XmitDescriptor classes
    [read,
     WmiDataId(6),
     WmiSizeIs("XmitDescriptorCount"),
     WmiScale(0),
     WmiComplexity(1),
     WmiVolatility(1000)]
    Vendor_XmitDescriptor XmitBufferSize[];
}

Veja a seguir a definição de classe para a classe inserida mostrada no exemplo anterior. Note that this class does not contain InstanceName or Active items.

// Example of an embedded class 
[WMI, guid("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"),
class Vendor_XmitDescriptor {
    [read, WmiDataId(1)] int32 DestinationIndex;
    [read, WmiDataId(2)] int32 DestinationTarget;
}

Veja a seguir uma definição de classe para um bloco de eventos. The class is derived from WmiEvent.

// Example of an event
[WMI, Dynamic, Provider("WMIProv"),
guid("{xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}"),
locale("MS\\0x409"),
WmiExpense(1),
Description("Notify Toaster Arrival")]
class ToasterNotifyDeviceArrival : WMIEvent
{
    [key, read]
    string      InstanceName;

    [read]
    boolean           Active;

    [read,
     Description("Device Model Name"),
     WmiDataId(1)]    string     ModelName;
};