我想创建程序,它会根据"实时"中的接收数据以任何方式为椭圆着色。数据类似于:x1-1
,x2-1
等。
我有一个奇怪的问题,我可以在调试时看到,填充椭圆的颜色应该改变,但它不会发生。
我接收数据的部分代码:
private void ReceiveData()
{
SerialPort serialPort = new SerialPort("COM1", 9600);
serialPort.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler);
serialPort.Open();
}
private static void DataReceivedHandler(
object sender,
SerialDataReceivedEventArgs e)
{
SerialPort sp = (SerialPort)sender;
string indata = sp.ReadExisting();
if (indata.Contains(" "))
{
testString = indata.Substring(0, 4);
}
Console.Write(indata);
}
我可以在控制台中看到收到的数据,即使在点击按钮后开始接收数据。 testString
是从x1-1
中提取单indata
,在接收数据期间仍在增长 private void button1_Click(object sender, RoutedEventArgs e)
{
ReceiveData();
while (true)
{
if (testString == "x1-1") x1.Fill = Brushes.Blue;
else x1.Fill = Brushes.Red;
}
}
。我知道它不会像它应该的那样工作,但它现在并不重要。
按钮上的操作代码:
x1
heroku fork --from a***e-a*****e-94769 --to rd-test
是椭圆形,我想要制作红色或蓝色。我可以在这个函数中设置断点,我可以看到它应该改变。我认为问题是,该程序正在等待关闭端口并完成传输,然后它可能会改变,但我需要在"实时"。谁知道怎么做?
答案 0 :(得分:1)
我相信你会以错误的方式解决这个问题。您不必经常检查teststring
的值,而只需启动通讯端口侦听器并让它在后台运行 - 因为这将是它自己的线程。然后,您需要创建一个数据绑定到颜色。每当comm端口侦听器解析一个字符串时,它就会自动更新颜色。
首先,在CommPort类中:
class MyCommPort : INotifyPropertyChanged
{
SerialPort serialPort = null;
public MyCommPort()
{
serialPort = new SerialPort("COM3", 9600);
serialPort.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler);
serialPort.Open();
}
~MyCommPort()
{
serialPort.Close();
}
private void DataReceivedHandler(object sender, SerialDataReceivedEventArgs e)
{
SerialPort sp = (SerialPort)sender;
string testString = null;
string indata = sp.ReadLine();
if (indata.Length >= 4)
{
testString = indata.Substring(0, 4);
// Update the value
if (testString == "x1-1") EllipseBrush = Brushes.Blue;
else EllipseBrush = Brushes.Red;
}
Console.Write(testString);
}
// Create a property that will be bound
private SolidColorBrush ellipseBrush = Brushes.Red;
public SolidColorBrush EllipseBrush
{
get { return ellipseBrush; }
set
{
ellipseBrush = value;
OnPropertyChanged("EllipseBrush");
}
}
// Extend the INotifyPropertyChanged interface
public event PropertyChangedEventHandler PropertyChanged;
private void OnPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
{
// Alert anyone bound to this that the value has changed
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
}
然后,将Ellipse的DataContext设置为CommPort类,并将Ellipse的Fill属性绑定到EllipseBrush。
现在你所要做的就是启动Commport监听器(ReceiveData();
),颜色更新应该自动发生。
例如:MainWindow.xaml
<Window x:Class="delete_me.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Grid>
<Ellipse x:Name="ellipse" Fill="{Binding Path=EllipseBrush}" />
</Grid>
</Window>
后面的代码:MainWindow.xaml.cs
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
ellipse.DataContext = new MyCommPort();
}
}
答案 1 :(得分:0)
不要通过在按钮单击事件中包含while(true)
来挂起UI线程。使用DispatchTimer来代替每500秒做一次工作。
System.Windows.Threading.DispatcherTimer MyTimer = null;
private void ReceiveData()
{
MyTimer = new System.Windows.Threading.DispatcherTimer();
MyTimer.Interval = new TimeSpan(0, 0, 0, 0, 500);
MyTimer.Tick += MyTimer_Tick;
MyTimer.Start();
SerialPort serialPort = new SerialPort("COM1", 9600);
serialPort.DataReceived += new
SerialDataReceivedEventHandler(DataReceivedHandler);
serialPort.Open();
}
private static void DataReceivedHandler(
object sender,
SerialDataReceivedEventArgs e)
{
SerialPort sp = (SerialPort)sender;
string indata = sp.ReadExisting();
if (indata.Contains(" "))
{
testString = indata.Substring(0, 4);
}
}
private void button1_Click(object sender, RoutedEventArgs e)
{
ReceiveData();
}
private void MyTimer_Tick(object sender, EventArgs e)
{
if (testString == "x1-1")
{
x1.Fill = Brushes.Blue;
}
else
{
x1.Fill = Brushes.Red;
}
}