Put function

Artikkeli
09/15/2021

Sets a named property to a new value.

Note

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

Syntax

HRESULT Put (
   [in] int               vFunc,
   [in] IWbemClassObject* ptr,
   [in] LPCWSTR           wszName,
   [in] LONG              lFlags,
   [in] VARIANT*          pVal,
   [in] CIMTYPE           vtType
);

Parameters

vFunc
[in] This parameter is unused.

ptr
[in] A pointer to an IWbemClassObject instance.

wszName
[in] The name of the property. This parameter cannot be null.

lFlags
[in] Reserved. This parameter must be 0.

pVal
[in] A pointer to a valid VARIANT that becomes the new property value. If pVal is null or points to a VARIANT of type VT_NULL, the property is set to null.

vtType
[in] The type of VARIANT pointed to by pVal. See the Remarks section for more information.

Return value

The following values returned by this function are defined in the WbemCli.h header file, or you can define them as constants in your code:

Constant	Value	Description
`WBEM_E_FAILED`	0x80041001	There has been a general failure.
`WBEM_E_INVALID_PARAMETER`	0x80041008	One or more parameters are not valid.
`WBEM_E_INVALID_PROPERTY_TYPE`	0x8004102a	The property type is not recognized. This value is returned when creating class instances if the class already exists.
`WBEM_E_OUT_OF_MEMORY`	0x80041006	Not enough memory is available to complete the operation.
`WBEM_E_TYPE_MISMATCH`	0x80041005	For instances: Indicates that `pVal` points to a `VARIANT` of an incorrect type for the property. For class definitions: The property already exists in the parent class, and the new COM type is different from the old COM type.
`WBEM_S_NO_ERROR`	0	The function call was successful.

Remarks

This function wraps a call to the IWbemClassObject::Put method.

This function always overwrites the current property value with a new one. If the IWbemClassObject points to a class definition, Put creates or updates the property value. When IWbemClassObject points to a CIM instance, Put updates the property value only; Put cannot create a property value.

The __CLASS system property is only writable during class creation, when it may not be left blank. All other system properties are read-only.

A user cannot create properties with names that begin or end with an underscore ("_"). This is reserved for system classes and properties.

If the property set by the Put function exists in the parent class, the default value of the property is changed unless the property type does not match the parent class type. If the property does not exist and it is not a type mismatch, the property is created.

Use the vtType parameter only when creating new properties in a CIM class definition and pVal is null or points to a VARIANT of type VT_NULL. In this case, the vType parameter specifies the CIM type of the property. In every other case, vtType must be 0. vtType must also be 0 if the underlying object is an instance (even if Val is null) because the type of the property is fixed and cannot be changed.

Example

For an example, see the IWbemClassObject::Put method.

Requirements

Platforms: See System Requirements.

Header: WMINet_Utils.idl

.NET Framework Versions: Available since 4.7.2

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