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Device I/O Control Codes

Windows Media Player 10 or later defines Windows Media Device Manager device I/O control codes. The following table contains the control codes and their descriptions.

I/O control code Value Description
IOCTL_WMP_METADATA_ROUND_TRIP0x31504d57Manages transfer of information about changes that occurred to metadata values. See Device Extensions for Accelerated Metadata Transfer.
IOCTL_WMP_DEVICE_CAN_SYNC0x32504d57Indicates whether a portable device supports automatic synchronization. Windows Media Player 10 or later provides no input buffer.

The output buffer must return a DWORD value. A value of 1 means the device supports synchronization. A value of 0 means the device does not support automatic synchronization.

See Remarks for more information.

 

Remarks

These control codes are defined in wmpdevices.h.

If the device does not support IOCTL_WMP_DEVICE_CAN_SYNC, Windows Media Player 10 or later assumes the device supports automatic synchronization. Note that while this value can disallow automatic synchronization, there are additional criteria used to determine whether the device supports automatic synchronization.

Related topics

Device Extensions for Accelerated Metadata Transfer
Windows Media Player

 

 

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