The TextToSpeechSpeak call queues a null-terminated string to the text-to-speech system. While in startup state, speech samples are routed to the audio device or ignored, depending on whether the DO_NOT_USE_AUDIO_DEVICE flag is set in the dwDeviceOptions parameter of the startup function. If the text_to_speech system is in one of its special modes (wave-file, log-file, or speech-to-memory modes), the speech samples are handled accordingly.
Syntax |
MMRESULT TextToSpeechSpeak |
(LPTTS_HANDLE_T phTTS, | ||
Parameters |
LPTTS_HANDLE_T phTTS |
Specifies a text-to-speech handle. | ||
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LPSTR pszTextString |
Points to a null terminated string of characters to be queued | ||
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DWORD dwFlags |
Specifies whether the text is to be pushed through the text-to-speech system even if it does NOT end on a clause boundary. It can be set to one of the following constants defined in include file ttsapi.h: | ||
Constant |
Description | |||
Insert characters in the text-to-speech queue. | ||||
Insert characters in the text-to-speech queue and force all text to be output even if the text stream does NOT end on a clause boundary. | ||||
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Return Value |
This call returns a value of type MMRESULT. The return value is zero if the call is successful. The return value is one of the following constants: | |||
Constant |
Description | |||
MMSYSERR_NOERROR |
Normal successful completion (zero). | |||
MMSYSERR _NOMEM |
Unable to allocate memory. | |||
MMSYSERR_INVALHANDLE |
The text-to-speech handle was invalid. | |||
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Comments |
The speaker, speaking rate, and volume can also be changed in the text string by inserting in-line commands as shown in the following example: [:name paul] I am Paul. [:nb] I am Betty. [:volume set 50] The volume has been set to 50% of the maximum level. [:ra 120] I am speaking at 120 words per minute. | |||
See Also |