如何在我的 Windows 窗体应用程序中使用串行端口？

Question

我正在尝试从程序创建一个 C# 程序，它是一个带有四个按钮的简单框：左、右、上、下。然后，当最初按下按钮（但不放开）时，它将发送串行线。然后，当未单击按钮时（用户放开鼠标左键），我想发送另一个串行命令。

问题是每个 void OnClick... (object sender, System.EventArgs e) 彼此独立，并且串行端口“端口”在整个程序中不起作用。我主要用于串行使用：

SerialPort port = new SerialPort("COM1", 9600, Parity.None, 8, StopBits.One);
port.Open();

我不想每次想发送一些东西时打开和关闭串行端口，因为它可能太接近（就时间而言）并且可能导致“串行端口正在使用”串行线路发送中出现问题和/或滞后。

尽我所能地减肥。

代码：

    public class EAS_ControlForm : System.Windows.Forms.Form
    {
        private Button Up4;
        private Button Down3;
        private Button Left2;
        private Button Right1;
        public EAS_ControlForm()
        {
            Text = "Etch-a-Sketch Control";
            Down3 = new Button ();
            Up4 = new Button ();
            Left2 = new Button ();
            Right1 = new Button ();

            Down3.Text = "Down";
            Down3.Name = "Down3";
            Down3.Size = new System.Drawing.Size (72, 30);
            Down3.Location = new System.Drawing.Point ((ClientRectangle.Width - Down3.Size.Width) / 2, ClientRectangle.Height - 10);
            Controls.AddRange(new System.Windows.Forms.Control[] {this.Down3});
            Down3.Click += new System.EventHandler(OnClickDown3);

            Up4.Text = "Up";
            ///...button up4 stuff here like down 3 above.

            Left2.Text = "Left";
            ///...button left2 stuff here like down 3 above.

            Right1.Text = "Right";
            ///...button right1 stuff here like down 3 above.
        }

        static public void Main() 
        {
            SerialPort port = new SerialPort("COM1", 9600, Parity.None, 8, StopBits.One);
            port.Open();

            Application.Run(new EAS_ControlForm());
        }

        void OnClickDown3 (object sender, System.EventArgs e)
        {
            port.Write("<3,100>");
        }

        void OnClickUp4 (object sender, System.EventArgs e)
        {
            port.Write("<4,100>"); //error here because of port initialization not in same code
        }

        void OnClickLeft2 (object sender, System.EventArgs e)
        {
            port.Write("<2,100>"); 
        }

        void OnClickRight1 (object sender, System.EventArgs e)
        {
            port.Write("<1,100>");
        }
    }
}

Answer 1

static SerialPort port;
static public void Main()          
{             
    port = new SerialPort("COM1", 9600, Parity.None, 8, StopBits.One);
    port.Open();              
    Application.Run(new EAS_ControlForm());         
} 

Answer 2

Try introducing a member function to share the serial port reference or send it through the constructor.

    SerialPort port ;
    public void SetSerialPort(SerialPort p_serialPort )
    {
        port = p_serialPort;
    }

    static public void Main() 
    {
        SerialPort port = new SerialPort("COM1", 9600, Parity.None, 8, StopBits.One);
        port.Open();
        EAS_ControlForm myform = new EAS_ControlForm();
        myform.SetSerialPort(port);

        Application.Run(myform);
    }

看看这是否是您想要的。

Answer 3

只需将端口定义为类成员即可。在表单的构造函数中或在 Load 事件中对其进行初始化。