Assert and Breakpoint Macros

[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

The DirectShow Base Classes provide several macros that perform asserts or cause breakpoints.

Macro Description
ASSERT Evaluates an expression, and displays a diagnostic message if the expression is FALSE.
DbgAssertAligned Tests whether a pointer is aligned to a specified boundary.
DbgBreak Displays a message box with the specified string, the name of the source file, and the line number.
EXECUTE_ASSERT Evaluates an expression in debug and retail builds. In debug builds, displays a diagnostic message if the expression is FALSE.
KASSERT Evaluates an expression, and causes a breakpoint exception if the expression is FALSE.
KDbgBreak Causes a breakpoint exception, and logs the specified string.

 

Debugging Utilities