pi40iv_GetInputSizeBits

The ViSession handle that you obtain from the pi40iv_init or pi40iv_InitWithOptions function.  The handle identifies a particular instrument session.
Default Value:  None

sub-unit of target to read (unity-based)

Number of bits in input subunit

Returns the status code of this operation.  The status code  either indicates success or describes an error or warning condition.  You examine the status code from each call to an instrument driver function to determine if an error occurred.
To obtain a text description of the status code, call the pi40iv_error_message function.  To obtain additional information about the error condition, call the pi40iv_GetErrorInfo function.  To clear the error information from the driver, call the pi40iv_ClearErrorInfo function.
The general meaning of the status code is as follows:
Value                  Meaning
-------------------------------
0                      Success
Positive Values        Warnings
Negative Values        Errors
This driver defines the following status codes:
Status    Description
-------------------------------------------------
WARNINGS:
/*=CHANGE:===================================================*
Insert Instrument-defined warning codes here.
*================================================END=CHANGE=*/
ERRORS:
/*=CHANGE:===================================================*
Insert Instrument-defined error codes here.
*================================================END=CHANGE=*/
This instrument driver also returns errors and warnings defined by other sources.  The following table defines the ranges of additional status codes that this driver can return.  The table lists the different include files that contain the defined constants for the particular status codes:
Numeric Range (in Hex)   Status Code Types
-------------------------------------------------
3FFA2000 to 3FFA3FFF     IviSwtch Warnings
3FFA0000 to 3FFA1FFF     IVI      Warnings
3FFF0000 to 3FFFFFFF     VISA     Warnings
3FFC0000 to 3FFCFFFF     VXIPnP   Driver Warnings
BFFA2000 to BFFA3FFF     IviSwtch Errors
BFFA0000 to BFFA1FFF     IVI      Errors
BFFF0000 to BFFFFFFF     VISA     Errors
BFFC0000 to BFFCFFFF     VXIPnP   Driver Errors