app designe如何实现CAN消息的接收

在App Designer中实现CAN消息的接收，需要使用MATLAB中提供的CAN接口库函数，例如`canChannel = canChannel('Vector', 'CANcaseXL 1', 1)`用于创建CAN信道对象。下面是一个简单的实现CAN消息接收的示例代码：

classdef MyCANApp < matlab.apps.AppBase
    % Properties that correspond to app components
    properties (Access = public)
        UIFigure     matlab.ui.Figure
        MessageLabel matlab.ui.control.Label
    end
    
    % Properties that are not displayed in the app
    properties (Access = private)
        canChannel   % CAN信道对象
        canListener  % CAN消息监听器
    end
    
    methods (Access = private)
        % Callback function for receiving CAN messages
        function onMessageReceived(app, event)
            msg = event.Data;
            % Process the received message
            % ...
            % Update the message label in the UI
            app.MessageLabel.Text = sprintf('Received: ID=0x%X, Data=%s', msg.ID, dec2hex(msg.Data));
        end
    end
    
    % App initialization and creation
    methods (Access = private)
        % Create the CAN channel and listener
        function createCAN(app)
            % Create the CAN channel
            app.canChannel = canChannel('Vector', 'CANcaseXL 1', 1);
            % Create the CAN message listener
            app.canListener = canListener(app.canChannel, @app.onMessageReceived);
            % Start the CAN message listener
            start(app.canListener);
        end
    end
    
    % App creation and deletion
    methods (Access = public)
        % Construct app components
        function createComponents(app)
            % Create the main UI figure
            app.UIFigure = uifigure;
            app.UIFigure.Position = [100 100 300 200];
            app.UIFigure.Name = 'My CAN App';
            % Create the message label
            app.MessageLabel = uilabel(app.UIFigure);
            app.MessageLabel.Position = [20 100 260 20];
            app.MessageLabel.Text = 'Waiting for messages...';
        end
        
        % App startup and close
        function startup(app)
            % Create the CAN channel and listener
            createCAN(app);
        end
        
        function close(app)
            % Stop the CAN message listener
            stop(app.canListener);
            % Close the CAN channel
            delete(app.canChannel);
        end
    end
    
    % App creation and running
    methods (Access = public, Static)
        function run()
            % Create and run the app
            app = MyCANApp;
            app.createComponents();
            app.startup();
            % Wait for the app to close
            waitfor(app.UIFigure);
            app.close();
        end
    end
end

在上述示例代码中，通过`canChannel`函数创建了一个CAN信道对象，然后使用`canListener`函数创建了一个CAN消息监听器，并指定了一个回调函数`onMessageReceived`用于处理接收到的CAN消息。在回调函数中，可以对接收到的CAN消息进行处理，并更新UI界面中的消息标签。使用`start`函数启动CAN消息监听器，监听器会自动接收CAN消息并调用指定的回调函数进行处理。在`startup`方法中创建CAN信道和监听器，在`close`方法中关闭CAN信道和监听器。最后，通过静态方法`run`创建并运行App对象，等待App关闭。