hasNextMessage
Description
checks if the IDC file selection has a subsequent message to read. This object function
returns flag
= hasNextMessage(msgReader
)true
if there is a next message available to read from the
ibeoMessageReader
object, msgReader
. Otherwise, it returns
false
.
Examples
Read and Visualize Sensor Messages from IDC File
Create an ibeoFileReader
object, ibeoReader
,
to read the message headers from the IDC file. Replace the placeholder argument
sample_data.idc
with the name of your IDC file as
sample_data.idc
file is not provided with the toolbox.
ibeoReader = ibeoFileReader('sample_data.idc')
ibeoReader = ibeoFileReader with properties: FileName: "C:/Documents/MATLAB/ibeo_data/sample_data.idc" StartTime: 15-Mar-2020 11:21:04.999434999 EndTime: 15-Mar-2020 11:25:35.030095000 Duration: 00:04:30 FileSummary: CAN 53 msgs [0x1002] scan 53 msgs [0x2205] object 106 msgs [0x2281] image 53 msgs [0x2403] vehicleState 53 msgs [0x2808] measurementList 53 msgs [0x2821] pointCloudPlane 53 msgs [0x7510] unsupported 53 msgs [0x6120] unsupported 53 msgs [0x6970]
Create an ibeoMessageReader
object, imgReader
,
to read all images in the first 2 minutes, by using the select
function with appropriate message type and time range values.
timeRange = [0, minutes(2)];
imgReader = select(ibeoReader, 'image', timeRange);
Visualize the message data by reading the messages one at a time to a video player
object. First, create a vision.VideoPlayer
object. Then, use the
hasNextMessage
function to check whether
imgReader
contains a message after the current one. If it
does, use readNextMessage
function to read the images into the
workspace.
videoPlayer = vision.VideoPlayer; while hasNextMessage(imgReader) img = readNextMessage(imgReader); step(videoPlayer,img); end release(videoPlayer);
Reset the ibeoMessageReader
object, imgReader
,
to the first message in the selection, using the reset
function.
reset(imgReader);
Input Arguments
msgReader
— Message reader
ibeoMessageReader
object
Message reader, specified as a ibeoMessageReader
object.
Output Arguments
flag
— File selection has subsequent message to read
true
| false
File selection has subsequent message to read, returned as a logical
true
or false
.
Version History
Introduced in R2021a
See Also
ibeoFileReader
| select
| reset
| readNextMessage
| readMessages
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