viGetAttribute
Syntax
viGetAttribute(ViSession/ViEvent/ViFindList vi, ViAttr attribute, ViAttrState attrState);
Description
This function retrieves the state of an attribute for the specified session.
Parameters
|
Name |
Dir |
Type |
Description |
|
vi |
IN |
ViSession |
Unique logical identifier to a session, event, or find list. |
|
attribute |
IN |
ViAttr |
Resource attribute for which the state query is made. |
|
attrState |
OUT |
See Note below. |
The state of the queried attribute for a specified resource. The interpretation of the returned value is defined by the individual resource. Note that you must allocate space for character strings returned. |
Note: The pointer passed to viGetAttribute must point to the exact type required for that attribute, ViUInt16, ViInt32, etc. For example, when reading an attribute state that returns a ViChar, you must pass a pointer to a ViChar variable. You must allocate space for the returned data.
Return Values
|
Type ViStatus |
This is the function return status. It returns either a completion code or an error code as follows. |
|
Completion Code |
Description |
|
VI_SUCCESS |
Resource attribute retrieved successfully. |
|
Error Codes |
Description |
|
VI_ERROR_INV_SESSION |
The given session or object reference is invalid (both are the same value). |
|
VI_ERROR_NSUP_ATTR |
The specified attribute is not defined by the referenced resource. |
See Also