Windows Management Instrumentation (WMI) and Performance Counters (Unmanaged API Reference)

The .NET Framework WMI and Performance Counters unmanaged API consists of a set of functions that wrap calls to the native Windows Management Instrumentation API. It allows you to develop tools and libraries that manage and monitor remote computer systems.

Note

This API is for internal use only. It's not intended for use from developer code.

The API includes the following functions:

Function	Description
BeginEnumeration function	Resets the enumerator to the beginning of an enumeration of WMI object properties.
BeginMethodEnumeration function	Begins an enumeration of the methods available for an object.
BlessIWbemServices function	Indicates whether the user credentials permit access to a specified IWbemServices class.
BlessIWbemServicesObject function	Indicates whether the user credentials permit access to a specified IWbem service object.
Clone function	Returns a new object that is a complete clone of the current object.
CloneEnumWbemClassObject function	Makes a logical copy of an enumerator, retaining its current position in an enumeration.
CompareTo function	Compares an object to another Windows management object.
ConnectServerWmi function	Creates a connection through DCOM to a WMI namespace on a specified computer.
CreateClassEnumWmi function	Returns an enumerator for all classes that satisfy the specified selection criteria.
CreateInstanceEnumWmi function	Returns an enumerator that returns the instances of a specified class that meet specified selection criteria.
Delete function	Deletes a specified property from a class definition and all of its qualifiers.
DeleteMethod function	Deletes a specified method from a CIM class definition.
EndEnumeration function	Terminates an enumeration sequence.
EndMethodEnumeration function	Terminates an enumeration sequence started by calling the BeginMethodEnumeration function.
ExecNotificationQueryWmi function	Executes a query to receive events.
ExecQueryWmi function	Executes a query to retrieve objects.
FormatFromRawValue function	Converts one raw performance data value to the specified format, or two raw performance data values if the format conversion is time-based.
Get function	Retrieves a specified property value if it exists.
GetCurrentApartmentType function	Retrieves the type of apartment in which the caller is executing.
GetDemultiplexedStub function	Creates an object forwarder sink to assist a client in receiving asynchronous calls from Windows Management.
GetErrorInfo function	Retrieves error information from the previous function call.
GetMethod function	Retrieves information about the specified method.
GetMethodOrigin function	Determines the class in which a method is declared.
GetMethodQualifierSet function	Retrieves the qualifier set for a particular method.
GetNames function	Retrieves either a subset or all of the names of the properties of an object.
GetObjectText function	Returns a textual rendering of an object in the MOF syntax.
GetPropertyHandle function	Returns a unique handle that identifies a property.
GetPropertyOrigin function	Determines the class in which a property is declared.
GetPropertyQualifierSet function	Retrieves the qualifier set for a particular property.
GetQualifierSet function	Retrieves the qualifier set for a class instance or a class definition.
InheritsFrom function	Determines whether the current class or instance derives from a specified parent class.
Initialize function	Performs WMI initialization.
Next function	Retrieves the next property in an enumeration.
NextMethod function	Retrieves the next method in an enumeration.
Put function	Sets a named property to a new value.
PutClassWmi function	Creates a new class or updates an existing one.
PutInstanceWmi function	Creates or updates an instance of an existing class. The instance is written to the WMI repository.
PutMethod function	Creates a method.
QualifierSet_BeginEnumeration function	Resets an enumerator of the qualifiers of an object to the beginning of the enumeration.
QualifierSet_Delete function	Deletes a specified qualifier by name.
QualifierSet_EndEnumeration function	Terminates the enumeration begun with a call to the QualifierSet_BeginEnumeration function.
QualifierSet_Get function	Gets the specified named qualifier.
QualifierSet_GetNames function	Retrieves the names of all qualifiers or of specified qualifiers that are available from the current object or property.
QualifierSet_Next function	Retrieves the next qualifier in an enumeration that started with a call to the QualifierSet_BeginEnumeration function.
QualifierSet_Put function	Writes the named qualifier and value.
ResetSecurity function	Assigns the supplied impersonation token to the current thread.
SetSecurity function	Retrieves the impersonation token associated with the current thread.
SpawnDerivedClass function	Creates a newly derived class object from a specified object.
SpawnInstance function	Creates a new instance of a class.
VerifyClient function	Ensures that the client key has the correct security.
WritePropertyValue function	Writes a specified number of bytes to a property identified by a property handle.

See also

• Unmanaged API reference