如何在我的Windows Forms應用程序中使用串口？

Question

我試圖從程序中製作一個C＃，它是一個帶有四個按鈕的簡單框：左，右，上，下。那麼當一個按鈕被初始按下時（但不會放開），它會發送一個串行線。然後當按鈕被點擊時（用戶放開鼠標左鍵）我想發送另一個串行命令。

問題是，每個void OnClick... (object sender, System.EventArgs e)與其他人分開，並且串口「端口」在整個程序中不起作用。我在主要用於串行應用：

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

我不想打開和關閉串口我想送點東西，因爲它可能太靠近在一起（在時間上），並且可能導致每次「串口在使用」問題和/或滯後於串口線的發送。

盡我所能地瘦下來。

代碼：

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

只需定義port作爲類成員。在窗體的構造函數中或在Load事件中初始化它。

Answer 3

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); 
    } 

看看這是你想要的。