| DWORD mciSendCommand(wDeviceID, wMessage, dwParam1, dwParam2) | |||
| WORD wDeviceID; | |||
| UINT wMessage; | |||
| DWORD dwParam1; | |||
| DWORD dwParam2; |
The mciSendCommand function dwParam2)s
This function sends a command message to the specified MCI device.
wDeviceID
Specifies the device ID of the MCI device to receive the command. This parameter is not used with the MCI_OPEN command.
wMessage
Specifies the command message.
dwParam1
Specifies flags for the command.
dwParam2
Specifies a pointer to a parameter block for the command.
Returns zero if the function was successful. Otherwise, it returns error information. The low-order word of the returned DWORD is the error return value. If the error is device-specific, the high-order word contains the driver ID; otherwise the high-order word is zero.
To get a textual description of mciSendCommand return values,pass the return value to mciGetErrorString.
Error values that are returned when a device is being opened are listed with the MCI_OPEN message. In addition to the MCI_OPEN error returns, this function can return the following values:
| Value | Meaning |
| MCIERR_BAD_TIME_FORMAT | Illegal value for time format. |
| MCIERR_CANNOT_USE_ALL | The device name “all” is not allowed for this command. |
| MCIERR_CREATEWINDOW | Could not create or use window. |
| MCIERR_DEVICE_LOCKED | The device is locked until it is closed automatically. |
| MCIERR_DEVICE_NOT_READY | Device not ready. |
| MCIERR_DEVICE_TYPE_REQUIRED | The device name must be a valid device type. |
| MCIERR_DRIVER | Unspecified device error. |
| MCIERR_DRIVER_INTERNAL | Internal driver error. |
| MCIERR_FILE_NOT_FOUND | Requested file not found. |
| MCIERR_FILE_NOT_SAVED | The file was not saved. |
| MCIERR_FILE_READ | A read from the file failed. |
| MCIERR_FILE_WRITE | A write to the file failed. |
| MCIERR_FLAGS_NOT_COMPATIBLE | Incompatible parameters were specified. |
| MCIERR_HARDWARE | Hardware error on media device. |
| MCIERR_INTERNAL | Internal error. |
| MCIERR_INVALID_DEVICE_ID | Invalid device ID. |
| MCIERR_INVALID_DEVICE_NAME | The device is not open or is not known. |
| MCIERR_INVALID_FILE | Invalid file format. |
| MCIERR_MULTIPLE | Errors occurred in more than one device. |
| MCIERR_NO_WINDOW | There is no display window. |
| MCIERR_NULL_PARAMETER_BLOCK | Parameter block pointer was NULL. |
| MCIERR_OUT_OF_MEMORY | Not enough memory for requested operation. |
| MCIERR_OUTOFRANGE | Parameter value out of range. |
| MCIERR_UNNAMED_RESOURCE | Attempt to save unnamed file. |
| MCIERR_UNRECOGNIZED_COMMAND | Unknown command. |
| MCIERR_UNSUPPORTED_FUNCTION | Action not available for this device. |
The following additional return values are defined for MCI sequencers:
| Value | Meaning |
| MCIERR_SEQ_DIV_INCOMPATIBLE | Set Song Pointer incompatible with SMPTE files. |
| MCIERR_SEQ_PORT_INUSE | Specified port is in use. |
| MCIERR_SEQ_PORT_MAPNODEVICE | Current map uses non-existent device. |
| MCIERR_SEQ_PORT_MISCERROR | Miscellaneous error with specified port. |
| MCIERR_SEQ_PORT_NONEXISTENT | Specified port does not exist. |
| MCIERR_SEQ_PORTUNSPECIFIED | No current MIDI port. |
| MCIERR_SEQ_NOMIDIPRESENT | No MIDI ports present. |
| MCIERR_SEQ_TIMER | Timer error. |
The following additional return values are defined for MCI waveform audio devices:
| Value | Meaning |
| MCIERR_WAVE_INPUTSINUSE | No compatible waveform recording device is free. |
| MCIERR_WAVE_INPUTSUNSUITABLE | No compatible waveform recording devices. |
| MCIERR_WAVE_INPUTUNSPECIFIED | Any compatible waveform recording device may be used. |
| MCIERR_WAVE_OUTPUTSINUSE | No compatible waveform playback device is free. |
| MCIERR_WAVE_OUTPUTSUNSUITABLE | No compatible waveform playback devices. |
| MCIERR_WAVE_OUTPUTUNSPECIFIED | Any compatible waveform playback device may be used. |
| MCIERR_WAVE_SETINPUTINUSE | Set waveform recording device is in use. |
| MCIERR_WAVE_SETINPUTUNSUITABLE | Set waveform recording device is incompatible with set format. |
| MCIERR_WAVE_SETOUTPUTINUSE | Set waveform playback device is in use. |
| MCIERR_WAVE_SETOUTPUTUNSUITABLE | Set waveform playback device is incompatible with set format. |
Use the MCI_OPEN command to obtain the device ID specified by wDeviceID.
mciGetErrorString, mciSendString