程序如下:
Option ExplicitPrivate Sub Command2_Click()
Unload Me
End
End SubPrivate Sub Form_Load()
MSComm1.PortOpen = True '每次都是这里提示错误“8002, 无效端口错误”,这句代码这样写难道不对吗?以下只要涉及到串口的语句也都提示错误
End Sub
Private Sub Command4_Click() '条码复位
MSComm1.Output = "R"
End SubPrivate Sub Form_Unload(Cancel As Integer)
MSComm1.PortOpen = False
End Sub
Private Sub Timer1_Timer() '定时扫描
If MSComm1.InBufferCount < 1 Then
MSComm1.InBufferCount = 0
Text2.Text = 0
Else
Text2.Text = MSComm1.Input '读取条码的数据
MSComm1.InBufferCount = 0
End If
End Sub
Option ExplicitPrivate Sub Command2_Click()
Unload Me
End
End SubPrivate Sub Form_Load()
MSComm1.PortOpen = True '每次都是这里提示错误“8002, 无效端口错误”,这句代码这样写难道不对吗?以下只要涉及到串口的语句也都提示错误
End Sub
Private Sub Command4_Click() '条码复位
MSComm1.Output = "R"
End SubPrivate Sub Form_Unload(Cancel As Integer)
MSComm1.PortOpen = False
End Sub
Private Sub Timer1_Timer() '定时扫描
If MSComm1.InBufferCount < 1 Then
MSComm1.InBufferCount = 0
Text2.Text = 0
Else
Text2.Text = MSComm1.Input '读取条码的数据
MSComm1.InBufferCount = 0
End If
End Sub
Option Explicit
Dim a As Integer
Dim b(16) As Integer
Dim c(16) As Integer
Dim entrySub Form_Load()
On Error GoTo abc
For a = 1 To 4
MSComm1.CommPort = a
MSComm1.PortOpen = True
c(a) = a
MSComm1.PortOpen = False
Next
For a = 1 To 4 '显示有效端口号
If b(a) = c(a) Then
'Print ; "无效COM口= " & b(a)
Else
'Print ; "有效COM口= " & a
entry = "COM" & a ' 创建输入项。
Combo1.AddItem entry
End If
Next
Exit Sub
abc:
b(a) = a
Resume Next
End Sub