DbgLog macro

[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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 DbgLog macro sends a string to the debug output location, if logging is enabled for the specified type and level. This macro is ignored in retail builds.

Syntax

void DbgLog(
         DWORD Types,
         DWORD Level,
   const TCHAR *pFormat,
               ...
);

Parameters

Types

Bitwise combination of one or more message types.

Level

Logging level for this message.

pFormat

A printf -style format string.

...

Additional arguments for the format string.

Return value

This macro does not return a value.

Remarks

If debug logging for any of the message types is set to the specified level or higher, this macro sends the formatted string to the debug output location.

The macro automatically adds a newline character to the output string.

DbgLog((LOG_TRACE, 3, TEXT("Connected input pin %d"), nPinNumber));

Requirements

See also

Debug Output Functions