## Utility Functions

This section contains reference entries for the DirectShow utility functions and macros. DirectShow provides utilities for conversion, setup, timers, retrieving interfaces and declaring IUnknown, helper functions for math operations, property pages, BSTR functions, and strings, and stream integer functions. Most utilities are contained in Wxutil.h, but others are contained in Combase.h, Errors.h, Pstream.h, Refclock.h, Renbase.h, Videoctl.h, and Wtype.h.

BSTR Functions

Bitmap Functions, Macros, and Data

CBaseRenderer Callback Function

CCritSec Debug Functions

Conversion Functions

CPosPassThru Helper Function

DLL and Setup Functions

Error Message Function

IUnknown Macro

INonDelegatingUnknown Interface

Math Helper Functions

Media Type Functions

Object and Pin Functions

Performance Macros

Property Page Helper Functions

Reference Time Function

Stream Integer Functions

String Functions

Message Function

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