|
info
The info command retrieves a hardware description from a device. All MCI devices
recognize this command.
wsprintf(lpstrCommand, "info %s %s %s", lpszDeviceID, lpszInfoType,
lpszFlags);
Parameters
lpszDeviceID
Identifier of an MCI device. This identifier or alias is assigned when the
device is opened.
lpszInfoType
Flag that identifies the type of information required. The following table
lists device types that recognize the info command and the flags used by each type:
cdaudio
| info identity
info upc
| product
| digitalvideo
| audio algorithm
audio quality
file
product
still algorithm
still quality
| usage
version
video algorithm
video quality
window text
| overlay
| file
product
| window text
| sequencer
| copyright
file
| name
product
| | product
| | | product
|
| waveaudio
| file
input
| output
product
|
The following table lists the flags that can be specified in the lpszInfoType parameter and their meanings:
audio algorithm
| Returns the name of the current audio compression algorithm.
| audio quality
| Returns the name for the current audio quality descriptor. This might return
"unknown" if the application has set parameters to specific values that do not
correspond to defined qualities.
| copyright
| Retrieves the MIDI file copyright notice from the copyright meta event.
| file
| Retrieves the name of the file used by the compound device. If the device is
opened without a file and the load command has not been used, a null string is returned.
| info identity
| Produces a unique identifier for the audio CD currently loaded in the player
being queried.
| info upc
| Produces the Universal Product Code (UPC) that is encoded on an audio CD. The
UPC is a string of digits. It might not be available for all CDs.
| input
| Retrieves the description of the current input device. Returns "none" if an
input device is not set.
| name
| Retrieves the sequence name from the sequence/track name meta event.
| output
| Retrieves the description of the current output device. Returns "none" if an
output device is not set.
| product
| Retrieves a description of the device. This information often includes the
product name and model. The string length will be 31 characters or fewer.
| still algorithm
| Returns the name of the current still image compression algorithm.
| still quality
| Returns the name for the current still image quality descriptor. This might
return "unknown" if the application has set parameters to specific values that do
not correspond to defined qualities.
| usage
| Returns a string describing usage restrictions that might be imposed by the
owner of the visual or audio data in the workspace.
| | Returns the release level of the device driver and hardware.
| | Returns the name of the current video compression algorithm.
| | Returns the name for the current video quality descriptor. This might return
"unknown" if the application has set parameters to specific values that do not
correspond to defined qualities.
| window text
| Retrieves the caption of the window used by the device.
|
lpszFlags
Can be "wait", "notify", or both. For digital-video and VCR devices, "test"
can also be specified. For more information about these flags, see The Wait, Notify, and Test Flags.
Return Values
Returns zero if successful or an error otherwise.
Remarks
The following command retrieves a description of the hardware associated with
the "mysound" device:
info mysound product
See Also
load
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