IOCTL_AG_SET_MIC_VOL (Compact 2013)

3/26/2014

This I/O control message sets the microphone volume of the hands-free device. Send this message with DeviceIoControl.

Syntax

BOOL DeviceIoControl(
    HANDLE hDevice,           // handle to device
    DWORD dwIoControlCode,    // use IOCTL_AG_SET_MIC_VOL
    LPVOID lpInBuffer,        // pointer to input buffer
    DWORD nInBufferSize,      // input buffer size
    LPVOID lpOutBuffer,       // pointer to output buffer
    DWORD nOutBufferSize,     // output buffer size
    LPDWORD lpBytesReturned,  // number of bytes returned
    OVERLAPPED lpOverlapped   // pointer to OVERLAPPED structure
);

Parameters

• hDevice
  The handle to the device.

• dwIoControlCode
  [in] Control code for the operation. Use IOCTL_AG_SET_MIC_VOL for this operation.

• lpInBuffer
  [in] Pointer to a USHORT that specifies the microphone volume.

• nInBufferSize
  [in] Set to sizeof(USHORT).

• lpOutBuffer
  [out] Not used; set to NULL.

• nOutBufferSize
  [out] Not used; set to zero.

• lpBytesReturned
  [out] Not used; set to NULL.

• lpOverlapped
  [out] Not used; set to NULL.

Remarks

To retrieve the current volume of the microphone, use the IOCTL_AG_GET_MIC_VOL I/O control.

Requirements

See Also

Reference

Bluetooth AG Service IOCTL Messages