VB.net chosing serial port System.IO.IOException

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I am trying to edit open source code i found, there is allot of bugs there, anyway i solve everything but i still have this one: i put a combo drop-down menu to chose between serial ports to communicate with arduino, but it seems always the program chose COM5 if i chose other port or not. this is the error i have when i press start button to communicate

SQL

An unhandled exception of type 'System.IO.IOException' occurred in System.dll
Additional information: The port 'COM5' does not exist.

and this is the combo drop-down menu code

SQL

Private Sub ComboBox1_SelectedIndexChanged(sender As Object, e As EventArgs) Handles ComboBox1.SelectedIndexChanged
End Sub

and this code for the start button

VB

Private Sub Button7_Click(sender As System.Object, e As System.EventArgs) Handles Button7.Click
        SerialPort1.Open()
        SerialPort1.Write("~")
        SerialPort1.Write("LCD is working!")
        Timer2.Start()
        SerialPort1.Close()
    End Sub

Posted 1-May-15 5:02am

Member 11643680

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2 solutions

Solution 1

Perhaps if you added some code to your SelecetedIndexChanged event to actually do something with the new value, it might help? Like use it to change the SerialPort1 port selection before you open it in the button click event handler?

Posted 1-May-15 5:12am

OriginalGriff

Comments

OriginalGriff 1-May-15 11:38am

Well...what do you think might be helpful? :laugh:

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Member 11643680 · Accepted Answer · 2015-05-01T05:50:00

Solution 2

I added this line to combobox and now work :) thanks

VB

SerialPort1.PortName = ComboBox1.SelectedItem

that's the final editing

VB

Private Sub ComboBox1_SelectedIndexChanged(sender As Object, e As EventArgs) Handles ComboBox1.SelectedIndexChanged
        SerialPort1.PortName = ComboBox1.SelectedItem
    End Sub
End Class

Posted 1-May-15 5:50am

Member 11643680

Comments

OriginalGriff 1-May-15 12:06pm

See! Isn't it better when you do it on your own? :laugh:

I'd suggest that you check the value of the SelectedIndex, and only do that code if it's greater than or equal to zero - otherwise you may get run time errors later.