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Syntax of Command Messages
MCI command messages consist of the following three elements:
- A constant message value
- A structure containing parameters for the command
- A set of flags specifying options for the command and validating fields in the
parameter block
The following example sends the MCI_PLAY command to the device identified by a device identifier.
mciSendCommand(wDeviceID, // device identifier
MCI_PLAY, // command message
0, // flags
(DWORD)(LPVOID) &mciPlayParms); // parameter block
The device identifier given in the first parameter is retrieved when the
device is opened using the MCI_OPEN command. The last parameter is the address of an MCI_PLAY_PARMS structure, which might contain information about where to begin and end
playback. Many MCI command messages use a structure to contain parameters of this
kind. The first member of each of these structures identifies the window that
receives an MM_MCINOTIFY message when the operation finishes.
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