This message is used to make, break, and query default connections between devices.

ulParam1 (ULONG)

This parameter can contain any of the following flags:

MCI_NOTIFY

A notification message will be posted to the window specified in the hwndCallback parameter of the data structure pointed to by the pParam2 parameter. The notification will be posted when the action indicated by this message is completed or when an error occurs.
MCI_WAIT
Control is not to be returned until the action indicated by this message is completed or an error occurs.
MCI_QUERY_CONNECTION
This flag specifies that the default connection associated with the indicated connector is to be returned in the pszToDevice, ulToConnectorType, and ulToConnectorIndex fields of the MCI_DEFAULT_CONNECTION_PARMS data structure.
MCI_MAKE_CONNECTION
This flag specifies that a default connection is to be established between the current device and the ulDeviceTypeID field of the data structure pointed to by pParam2. The precise connectors on each device can be indicated using the associated connector type and index flags.
MCI_BREAK_CONNECTION
This flag specifies that the default connection associated with the indicated connector is to be broken.
MCI_CONNECTOR_TYPE
This flag specifies that the connector type (ulConnectorType field) for the primary device is to be used for the query. When this flag is used the ulConnectorIndex field is used as a relative index rather than an absolute index.
MCI_CONNECTOR_INDEX
This flag specifies that the ulConnectorIndex field contains the connector index for the primary device. If this flag is not specified an index of 1 is assumed.
MCI_TO_CONNECTOR_TYPE
This flag specifies that the connector type (ulToConnectorType field) for the primary device is to be used for the query. When this flag is used, the ulToConnectorIndex field is used as a relative index rather than an absolute index.
MCI_TO_CONNECTOR_INDEX
This flag specifies that the ulToConnectorIndex field contains the connector index for the primary device. If this flag is not specified an index of 1 is assumed.

pParam2 (PMCI_DEFAULT_CONNECTION_PARMS)

A pointer to the MCI_DEFAULT_CONNECTION_PARMS data structure.

rc (ULONG)

Return codes indicating success or type of failure:

MCIERR_SUCCESS

If the function succeeds, 0 is returned.
MCIERR_INSTANCE_INACTIVE
The device ID is currently inactive. Issue MCI_ACQUIREDEVICE to make the device instance active.
MCIERR_MISSING_FLAG
A required flag is missing.
MCIERR_DRIVER
Internal MMPM/2 driver error.
MCIERR_UNSUPPORTED_FLAG
Given flag is unsupported for this device.
MCIERR_INVALID_CALLBACK_HANDLE
Given callback handle is invalid.
MCIERR_UNSUPPORTED_CONN_TYPE
This device does not support the given connector type.
MCIERR_INVALID_CONNECTOR_TYPE
The given connector type is invalid.
MCIERR_INVALID_CONNECTOR_INDEX
Invalid connector index given.
MCIERR_MISSING_PARAMETER
Required parameter is missing.
MCIERR_INVALID_FLAG
Flag is invalid (ulParam1).
MCIERR_FLAGS_NOT_COMPATIBLE
Flags cannot be used together.
MCIERR_INVALID_CONNECTION
An attempt was made to make an invalid connection.
MCIERR_NO_CONNECTION
An attempt was made to break a nonexistent connection.
MCIERR_INVALID_DEVICE_ID
A device ID is not valid.
MCIERR_INVALID_DEVICE_ORDINAL
Invalid device ordinal given.

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