CA_DefaultValueVariant
VARIANT CA_DefaultValueVariant (void);
Purpose
Some ActiveX server functions allow you to pass a variant parameter value that means "use the default value for this parameter." CA_DefaultValueVariant returns such a variant. You can use the macro CA_DEFAULT_VAL to refer to CA_DefaultValueVariant.
You can use the returned variant only for parameters that are optional. You can tell whether a parameter is optional by checking the default value in its function panel control. If the default value is CA_DEFAULT_VAL, the parameter is optional.
CA_DefaultValueVariant sets the type field in the returned variant to VT_ERROR and the error value field to DISP_E_PARAMNOTFOUND.
Parameters
None.
Return Value
| Name | Type | Description |
| variant | VARIANT | Variant in which the type field is set to VT_ERROR and the error value is set to DISP_E_PARAMNOTFOUND. |
Additional Information
Library: ActiveX Library
Include file: cviauto.h
LabWindows/CVI compatibility: LabWindows/CVI 5.0 and later