Imports
System
Imports
System.IO.Ports
Public
Class
Form1
Private
Sub
Form1_Load(
ByVal
sender
As
System.
Object
,
ByVal
e
As
System.EventArgs)
Handles
MyBase
.Load
'获取计算机有效串口
Dim
ports
As
String
() = SerialPort.GetPortNames()
'必须用命名空间，用SerialPort,获取计算机的有效串口
Dim
port
As
String
For
Each
port
In
ports
portnamebox.Items.Add(port)
'向combobox中添加项
Next
port
'初始化界面
baudratebox.SelectedIndex = 2
portnamebox.SelectedIndex = 0
Serial_Port1()
'初始化串口
Label3.Text = SerialPort1.IsOpen
statuslabel.Text =
"串口未连接"
statuslabel.ForeColor = Color.Red
sendbox.Text =
"123"
' baudratebox.Text = baudratebox.Items(0) 注释和不注释的地方可以替换
'portnamebox.Text = portnamebox.Items(0)
End
Sub
Private
Sub
Serial_Port1()
'设置串口参数
SerialPort1.BaudRate = Val(baudratebox.Text)
'波特率
SerialPort1.PortName = portnamebox.Text
'串口名称
SerialPort1.DataBits = 7
'数据位
SerialPort1.StopBits = IO.Ports.StopBits.One
'停止位
SerialPort1.Parity = IO.Ports.Parity.None
'校验位
End
Sub
'关闭串口连接
Private
Sub
closebtn_Click(
ByVal
sender
As
System.
Object
,
ByVal
e
As
System.EventArgs)
Handles
closebtn.Click
Try
SerialPort1.Close()
'关闭串口
Label3.Text = SerialPort1.IsOpen
If
SerialPort1.IsOpen =
False
Then
Statuslabel.Text =
"串口未连接"
Statuslabel.ForeColor = Color.Red
receivebox.Text =
""
receivebytes.Text =
""
End
If
Catch
ex
As
Exception
MessageBox.Show(ex.Message)
End
Try
End
Sub
'打开串口连接
Private
Sub
openbtn_Click(
ByVal
sender
As
System.
Object
,
ByVal
e
As
System.EventArgs)
Handles
openbtn.Click
Try
SerialPort1.Open()
'打开串口
Label3.Text = SerialPort1.IsOpen
If
SerialPort1.IsOpen =
True
Then
statuslabel.Text =
"串口已连接"
statuslabel.ForeColor = Color.Green
End
If
Catch
ex
As
Exception
MessageBox.Show(ex.Message)
End
Try
End
Sub
'发送数据
Private
Sub
Button1_Click(
ByVal
sender
As
System.
Object
,
ByVal
e
As
System.EventArgs)
Handles
closebtn.Click
Try
SerialPort1.Write(sendbox.Text)
Catch
ex
As
Exception
MessageBox.Show(ex.Message)
End
Try
End
Sub
'触发接收事件
Public
Sub
Sp_DataReceived(
ByVal
sender
As
Object
,
ByVal
e
As
System.IO.Ports.SerialDataReceivedEventArgs)
Handles
SerialPort1.DataReceived
Me
.Invoke(
New
EventHandler(
AddressOf
Sp_Receiving))
'调用接收数据函数
End
Sub
'接收数据
Private
Sub
Sp_Receiving(
ByVal
sender
As
Object
,
ByVal
e
As
EventArgs)
Dim
strIncoming
As
String
Try
receivebytes.Text = Str(Val(receivebytes.Text) + SerialPort1.BytesToRead)
If
SerialPort1.BytesToRead > 0
Then
Threading.Thread.Sleep(100)
'添加的延时
strIncoming = SerialPort1.ReadExisting.ToString
'读取缓冲区中的数据
SerialPort1.DiscardInBuffer()
receivebox.Text = strIncoming
listbox1.Items.Add(strIncoming)
End
If
Catch
ex
As
Exception
MessageBox.Show(ex.Message)
End
Try
End
Sub
End
Class
