# C-Library File IO Routines

PVK_deffh( ) | Pointer to Internal Structure Block

## Format

struct PVKINF * PVK_deffh (intfh);

Where:

fh File handle returned from a prior call to PVK_OpenExt( )

## Description

This function may be used to obtain a pointer to the internal structures maintained by PXPIO.

#### Note:
The values contained within this structure should not be modified by an outside application. Any attempt to do so may result in file corruption and/or cause the application to become unstable.

If successful, this function will return valid pointer; otherwise, it will return null.

#### Warning!
Passing a bad or invalid file handle can cause unpredictable results that may lead to abnormal termination.