Simple programming of multimedia MCI

MCI is an interface for Windows to provide multimedia devices.

 

To program MCI, send the mci_open command to open the device ---> send the mci_play command to play the device ----> send the mci_cloase

 

The mcisendcommand function can be used to send a command to a specified device. The definition of mcisendcommand is as follows:

 

Mcierror mcisendcommand (<br/> mcideviceid iddevice, // device ID <br/> uint umsg, // command type <br/> DWORD fdwcommand, // command flag <br/> DWORD dwparam // command parameter <br/>); <br/> 

 

 

The following example shows how to enable MP3 file playback.

 

# Include "stdafx. H "<br/> # include <mmsystem. h> <br/> # pragma comment (Lib, "winmm. lib "); <br/> int apientry winmain (hinstance, <br/> hinstance hprevinstance, <br/> lpstr lpcmdline, <br/> int ncmdshow) <br/> {<br/> // 1. open the device <br/> mci_open_parms openparms; // The mci_open Command requires a parameter struct <br/> openparms. lpstrdevicetype = "mpegvideo"; // The file device ID of MP3 is mpegvideo <br/> openparms. lpstrelementname = "C: // 1. MP3 "; // path for storing MP3 files <br/> // sending command <br/> mcisendcommand (<br/> null, // No device ID is required to open the device <br/> mci_open, // mci_open. This command indicates to open the device <br/> mci_open_element | mci_open_type | mci_wait, <br/> (DWORD) (lpvoid (& openparms ))); // pass the authorization parameter <br/>/* mci_open_element indicates that the lpstrelementname of mci_open_parms is valid <br/> mci_open_type indicates that the authorization lpstrdevicetype is valid <br/> mci_wait indicates that the command will be, knowing that the operation is complete <br/> (if mci_policy is used, the command will be returned immediately after being sent, and a notification message will be sent after the operation is completed) */</P> <p> // after the device is enabled, the device ID is stored in openparms. in wdeviceid, <br/> word m_wdeviceid = openparms. wdeviceid; <br/> // 2. Playback Device <br/> mci_play_parms playparms; // parameter struct required by the mci_play command <br/> mcisendcommand (<br/> m_wdeviceid, // The required device ID <br/> mci_play, // This command plays the device <br/> mci_wait, // wait until the playback file ends, and then return <br/> (DWORD) (lpvoid (& playparms); // pass the mci_play_parms parameter <br/> // 3. Disable the device <br/> mcisendcommand (<br/> m_wdeviceid, <br/> mci_close, <br/> null, <br/> null); <br/> return 0; <br/>}</P> <p> 

 

 

The formats supported by MCI are limited. Therefore, it may be difficult to develop a player. However, it is good to make alarms and prompt music.