Prog. Wont work w/o Debug statement>?! Timing Error?!?! Please help!

When i take out a debug statement the program ceases to work. But it works flawlessly with the statement inside (and the debug window open. If you close the debug window it will fail again). Its not erroring out, just reading funky data from the comm port. HELP!
Please email me if you find anything!!

jeff gladnick
[email protected]
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Private Sub MSComm1_OnComm()
Static Jcount As Integer 'Controls how many lines of input we will read
Dim JCurrentRow As String 'Accumulated string that is entered into test.txt
Dim CheckPoint As Boolean 'Conditional Logic for Inner Do Loop
Dim BufferChar As String 'Current Character in the MSComm1.input RCX buffer
Dim TempFileString As String 'Temporary String to store file data in before database
Dim i As Integer



Select Case MSComm1.CommEvent 'If data is being recieved from
Case comEvReceive 'the COMM port .....

Do While MSComm1.InBufferCount <> 0 And MSComm1.PortOpen = True ' Outer loop.




BufferChar = MSComm1.Input 'Set equal to char in Buffer
'Debug.Print MSComm1.InBufferCount
' Debug.Print BufferChar; <------- Here is the problem statement

If BufferChar = Chr(13) Then 'If data from serial port is a ...
CurrentRowDisplay.Text = JCurrentRow 'Display Current Row to form textbox
Open "test.txt" For Append As #1 'After a is encountered, Open
Print #1, JCurrentRow 'The test.txt file and write then line
' Debug.Print ">"; JCurrentRow
Close #1 'to it. Then close the file


Jcount = 1 + Jcount 'increment counter
CurrentlyAt.Text = Jcount 'Display to user the value of counter
Debug.Print "Index:"; Jcount 'Debug stuff
End If

JCurrentRow = JCurrentRow + BufferChar 'Add character in buffer to string

If Jcount = NumOfLines Then 'If the counter has reached its limit
' MSComm1.PortOpen = False
' Text1.Text = "Done!"

Open "test.txt" For Input As #2 'Open Test.txt file and then
Do While Not EOF(2) ' Loop until end of file.
Line Input #2, TempFileString ' Read line into variable.


Open "BigData.txt" For Append As #3 'Open big database for input
Print #3, TempFileString 'Append the temporary data to larger database
Close #3 'Close the file
TempFileString = "" 'Clear the tempfile string
Debug.Print TextLine ' Print to Debug window.

Loop

Close #2 ' Close file.

Open "test.txt" For Output As #4 'Open Test.txt file and then
' Write #4, 'Remove all contents of temp file
Close #4 'Close test.txt

'TempFileString = LOF(2) 'Store it in a temporary string

Jcount = 0 'Reset Jcount so it may start over
Exit Do
End If


Loop
End Select
End Sub

Try replacing the debug statement with a DoEvents.

I disagree - using a DoEvents command in an event subroutine can lead to a stack overflow, as the DoEvents command wont return until all events are handled - what if that includes another Comm port event?



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Ex. Datis: Duncan Jones
Merrion Computing Ltd
http://www.merrioncomputing.com