WMI-Klassenbeispiele

Die folgenden Beispiele zeigen Klassendefinitionen aus dem Schema eines seriellen Porttreibers. Note that the guid values shown in these examples are placeholders. Jede Klassendefinition muss über eine eindeutige GUID verfügen, die von guidgen.exe oder uuidgen.exe generiert wird (die im Microsoft Windows SDK enthalten sind).

// 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[];
}

Im Folgenden sehen Sie die Klassendefinition für die eingebettete Klasse, die im vorherigen Beispiel gezeigt wird. 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;
}

Es folgt eine Klassendefinition für einen Ereignisblock. 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;
};