CA_VariantHasNull
HRESULT CA_VariantHasNull (const VARIANT *variant);
Purpose
Determines whether the data type of a variant is VT_NULL.
Parameters
| Input | ||
| Name | Type | Description |
| variant | const VARIANT * | Pointer to the variant variable to inspect. |
Return Value
| Name | Type | Description |
| result | HRESULT | 1 if variant has a type of VT_NULL. 0 if variant does not have a type of VT_NULL. < 0 if variant is invalid. Negative error codes indicate function failure. Refer to <Program Files>\National Instruments\Shared\MSDTRedistributables\SDKHeaderFiles\8.1\winerror.h for Windows SDK error codes. |
Additional Information
Library: ActiveX Library
Include file: cviauto.h
LabWindows/CVI compatibility: LabWindows/CVI 5.0 and later