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SoundSentryProc info  Overview  Group

The SoundSentryProc function is a library-defined callback function that produces a customized visual signal when the SoundSentry accessibility feature is on and a Windows-based application (or a non-Windows-based application running in a window) generates a sound through the computer’s built-in speaker.


    DWORD dwMillisec,

// duration of visual signal

    DWORD fdwEffect

// effect-type flag



Specifies the duration, in milliseconds, of the visual signal that is displayed when a Windows-based application (or a non-Windows-based application running in a window) generates a sound.
Specifies the type of visual signal to display. Currently, this value must always be SSWF_CUSTOM.

Return Values

If the visual signal was or will be displayed correctly, the return value is TRUE. If the signal is asynchronous and the status is not available when the function is called, it should return TRUE.

If an error prevented the signal from being displayed, the return value is FALSE. To get extended error information, call GetLastError.


The library that contains the SoundSentryProc function must be a 32-bit DLL, and the DLL must export a function with the name “SoundSentryProc.”

The SoundSentryProc function is called only after an application or library calls the SystemParametersInfo function, specifying the SPI_SETSOUNDSENTRY value and the address of a SOUNDSENTRY structure whose iWindowsEffect member is set to SSWF_CUSTOM.

See Also

SOUNDSENTRY, SystemParametersInfo

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