RIL_SendDTMF (Windows Embedded CE 6.0)

1/6/2010

This function sends Dual-Tone Multifrequency (DTMF) tones across an established voice call.

Syntax

HRESULT RIL_SendDTMF(
  HRIL hRil,
  LPCSTR lpszChars,
  DWORD dwDuration
);

Parameters

• hRil
  Handle to the RIL instance returned by RIL_Initialize.

• lpszChars
  Alphanumeric string representing DTMF tones to be sent. If the string contains multiple characters, each tone is played sequentially. Set to RIL_DTMFDURATION_DEFAULT.

• dwDuration
  Specifies the new DTMF tone duration in milliseconds. Although Microsoft does not set a requirement for tone duration, the RIL sample driver uses a default value of 3 seconds.

Return Value

Positive HRESULT values indicate success and are used as command identifications for matching the asynchronous call result. Negative HRESULT values indicate an error. Errors are defined in the Ril.h file.

An asychronous result of RIL_RESULT_OK indicates success. The lpData notification parameter is set to NULL.

Remarks

This function does not return until the DTMF tone has completed.

The RIL proxy translates the RIL_SendDTMF function into IOCTL_RIL_SendDTMF when the RIL proxy calls RIL_IOControl.

Requirements

See Also

Reference

RIL Functions
RIL_Initialize