Required commands are recognized by all devices and have actions common to all media devices. The following table lists the required commands that must be supported by your MCD.
旼컴컴컴컴컴컴컴컴컴컫컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿘essage 쿏escription � 쳐컴컴컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿘CI_CLOSE 쿎loses the device. � 쳐컴컴컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿘CI_GETDEVCAPS 쿒ets the capabilities of a device. � 쳐컴컴컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿘CI_INFO 쿒ets textual information from the � � 쿭evice. � 쳐컴컴컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿘CI_OPEN 쿔nitializes an instance of the device. � 쳐컴컴컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿘CI_STATUS 쿒ets status information from the device.� 쳐컴컴컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿘CIDRV_SAVE 쿔s sent from MDM to MCDs to save the � � 쿬ontext. � 쳐컴컴컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿘CIDRV_RESTORE 쿔s sent from MDM to MCDs to restore the � � 퀂tate of an inactive device context. � 읕컴컴컴컴컴컴컴컴컴컨컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴�
The required command messages use a ULONG for the ulParam1 parameter that contains any flags for the command message. They also use the pParam2 parameter for a pointer to a message-specific data structure. Your MCD might create extended commands by adding new flags and data structure fields to those already defined. When you extend a command message, your MCD must still support the required flags and fields.
The following table identifies the flags and data structures of the required command messages. For a complete reference of media control interface commands, refer to the OS/2 Multimedia Programming Reference.
旼컴컴컴컴컴컴컴컫컴컴컴컴컴컴컴컴컴컴컴컴컴쩡컴컴컴컴컴컴컴컴컴컴컴컴컴컴커 쿘essage 쿛arameters (ulParam1) 쿏ata Structure (pParam2) � 쳐컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴캑 쿘CI_CLOSE 쿘CI_NOTIFY 쿘CI_GENERIC_PARMS � � 쿘CI_WAIT � � 쳐컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴캑 쿘CI_GETDEVCAPS 쿘CI_NOTIFY 쿘CI_GETDEVCAPS_PARMS � � 쿘CI_WAIT � � � 쿘CI_STATUS � � � 쿘CI_GETDEVCAPS_EXTENDED � � � 쿘CI_GETDEVCAPS_MESSAGE � � � 쿘CI_GETDEVCAPS_ITEM � � 쳐컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴캑 쿘CI_INFO 쿘CI_NOTIFY 쿘CI_INFO_PARMS � � 쿘CI_WAIT � � � 쿘CI_INFO_PRODUCT � � 쳐컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴캑 쿘CI_OPEN 쿘CI_WAIT 쿘MDRV_OPEN_PARMS � � 쿘CI_OPEN_SHARABLE � � � 쿘CI_OPEN_ELEMENT � � � 쿘CI_OPEN_MMIO � � 쳐컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴캑 쿘CI_STATUS 쿘CI_NOTIFY 쿘CI_STATUS_PARMS � � 쿘CI_WAIT � � � 쿘CI_STATUS_CLIPBOARD � � � 쿘CI_TRACK � � � 쿘CI_STATUS_ITEM � � 쳐컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴캑 쿘CIDRV_RESTORE 쿘CI_WAIT 쿘CI_GENERIC_PARMS � � 쿘CI_SHAREABLE � � � 쿘CI_EXCLUSIVE � � 쳐컴컴컴컴컴컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴캑 쿘CIDRV_SAVE 쿘CI_WAIT 쿘CI_GENERIC_PARMS � 읕컴컴컴컴컴컴컴컨컴컴컴컴컴컴컴컴컴컴컴컴컴좔컴컴컴컴컴컴컴컴컴컴컴컴컴컴켸