hasNextMessage

Check if Ibeo Data Container (IDC) file selection has next message

Since R2021a

collapse all in page

Syntax

flag = hasNextMessage(msgReader)

Description

flag = hasNextMessage(msgReader) checks if the IDC file selection has a subsequent message to read. This object function returns true if there is a next message available to read from the ibeoMessageReader object, msgReader. Otherwise, it returns false.

example

Examples

collapse all

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

collapse all

Message reader, specified as a ibeoMessageReader object.

Output Arguments

collapse all

File selection has subsequent message to read, returned as a logical true or false.

Version History

Introduced in R2021a

See Also

| | | |