Help!

[Jay1b]

I have got some really horrible debugging message, and to be honest i havent got a clue what is wrong!

 

I have pasted the section of code, that i believe is throwing up the error.

 

Thanks

 

                   'Removes the current line from the 
While i = 1
               'Finds the end of this line/start of next (by using FF) *1.1
               shtLineStart = InStr(1, strWaitingFromBuffer, Chr(1))
               'MsgBox(shtLineStart)
               shtLineEnd = InStr(shtLineStart, strWaitingFromBuffer, Chr(12))
               'MsgBox(shtLineEnd)
               'Would only be 0 if there was no more complete lines to process
               If shtLineEnd > 0 And shtLineStart > 0 Then
                   'Fines the current line, and puts in into strCurrentLine
                   strCurrentLine = strWaitingFromBuffer.Substring(shtLineStart, shtLineEnd - shtLineStart)
strWaitingFromBuffer, 
                   'so its only dealt with once
                   strWaitingFromBuffer = strWaitingFromBuffer.Remove(0, shtLineEnd)

                   'Searches through the current line removing a linefeed IF there is 1
                   intCharToRemove = InStr(j, strCurrentLine, Chr(10))
                   If intCharToRemove > 0 Then
                       ' MsgBox("in if statement")
                       'If theres a character to remove REMOVE IT!
                       strCurrentLine = strCurrentLine.Remove(intCharToRemove - 1, 1)
                       'MsgBox(Str(intCharToRemove))
                   End If

 

See the end of this message for details on invoking

just-in-time (JIT) debugging instead of this dialog box.

 

************** Exception Text **************

System.ArgumentException: Argument 'Start' must be greater or equal to zero.

at Microsoft.VisualBasic.Strings.InStr(Int32 Start, String String1, String String2, CompareMethod Compare)

at RoverComPort.modReadBuffer.ReadBuffer() in C:\Visual Studio Projects\rover_com_port_listener\rover_com_port_listener\modReadBuffer.vb:line 55

at RoverComPort.frmRoverBMain.tmrReadCommBuffer_Tick(Object sender, EventArgs e) in C:\Visual Studio Projects\rover_com_port_listener\rover_com_port_listener\frmMain.vb:line 660

at System.Windows.Forms.Timer.OnTick(EventArgs e)

at System.Windows.Forms.Timer.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr idEvent, IntPtr dwTime)

 

 

************** Loaded Assemblies **************

mscorlib

Assembly Version: 1.0.5000.0

Win32 Version: 1.1.4322.573

CodeBase: file:///c:/winnt/microsoft.net/framework/v1.1.4322/mscorlib.dll

----------------------------------------

RoverComPort

Assembly Version: 1.0.1413.24993

Win32 Version: 1.0.1413.24993

CodeBase: file:///C:/Visual%20Studio%20Projects/rover_com_port_listener/rover_com_port_listener/bin/RoverComPort.exe

----------------------------------------

System.Windows.Forms

Assembly Version: 1.0.5000.0

Win32 Version: 1.1.4322.573

CodeBase: file:///c:/winnt/assembly/gac/system.windows.forms/1.0.5000.0__b77a5c561934e089/system.windows.forms.dll

----------------------------------------

System

Assembly Version: 1.0.5000.0

Win32 Version: 1.1.4322.573

CodeBase: file:///c:/winnt/assembly/gac/system/1.0.5000.0__b77a5c561934e089/system.dll

----------------------------------------

System.Drawing

Assembly Version: 1.0.5000.0

Win32 Version: 1.1.4322.573

CodeBase: file:///c:/winnt/assembly/gac/system.drawing/1.0.5000.0__b03f5f7f11d50a3a/system.drawing.dll

----------------------------------------

AxInterop.MSCommLib

Assembly Version: 1.1.0.0

Win32 Version: 1.1.0.0

CodeBase: file:///C:/Visual%20Studio%20Projects/rover_com_port_listener/rover_com_port_listener/bin/AxInterop.MSCommLib.DLL

----------------------------------------

AxInterop.MSFlexGridLib

Assembly Version: 1.0.0.0

Win32 Version: 1.0.0.0

CodeBase: file:///C:/Visual%20Studio%20Projects/rover_com_port_listener/rover_com_port_listener/bin/AxInterop.MSFlexGridLib.DLL

----------------------------------------

Interop.MSCommLib

Assembly Version: 1.1.0.0

Win32 Version: 1.1.0.0

CodeBase: file:///C:/Visual%20Studio%20Projects/rover_com_port_listener/rover_com_port_listener/bin/Interop.MSCommLib.DLL

----------------------------------------

Interop.MSFlexGridLib

Assembly Version: 1.0.0.0

Win32 Version: 1.0.0.0

CodeBase: file:///C:/Visual%20Studio%20Projects/rover_com_port_listener/rover_com_port_listener/bin/Interop.MSFlexGridLib.DLL

----------------------------------------

Microsoft.VisualBasic

Assembly Version: 7.0.5000.0

Win32 Version: 7.10.3052.4

CodeBase: file:///c:/winnt/assembly/gac/microsoft.visualbasic/7.0.5000.0__b03f5f7f11d50a3a/microsoft.visualbasic.dll

----------------------------------------

Accessibility

Assembly Version: 1.0.5000.0

Win32 Version: 1.1.4322.573

CodeBase: file:///c:/winnt/assembly/gac/accessibility/1.0.5000.0__b03f5f7f11d50a3a/accessibility.dll

----------------------------------------

 

************** JIT Debugging **************

To enable just in time (JIT) debugging, the config file for this

application or machine (machine.config) must have the

jitDebugging value set in the system.windows.forms section.

The application must also be compiled with debugging

enabled.

 

For example:

 

<configuration>

<system.windows.forms jitDebugging="true" />

</configuration>

 

When JIT debugging is enabled, any unhandled exception

will be sent to the JIT debugger registered on the machine

rather than being handled by this dialog.

[PlausiblyDamp]

on the line

shtLineEnd = InStr(shtLineStart, strWaitingFromBuffer, Chr(12))

 

what is the value of shtLineStart?

 

and the value of j in

 

intCharToRemove = InStr(j, strCurrentLine, Chr(10)) ?

 

Also you shoud be using the strings .IndexOf method rather than the InStr function.

[Jay1b]

Thank you yet again!

 

>on the line

>shtLineEnd = InStr(shtLineStart, strWaitingFromBuffer, Chr(12))

>what is the value of shtLineStart?

 

It really depends on what the line below turns up - from memory on this example i think it was 267.

shtLineStart = InStr(1, strWaitingFromBuffer, Chr(1))

 

 

>and the value of j in intCharToRemove = InStr(j, strCurrentLine, Chr(10)) ?

 

1 in this case i believe, but to be honest i cant remember, and i cant get to the project until tuesday now.

 

 

>Also you shoud be using the strings .IndexOf method rather >than the InStr function.

 

Cheers... I seem to get told things like this alot, but to honest no one ever explains why. Is it that instr is left overs from VB6 or something?

[PlausiblyDamp]

Got it dead right - InStr is a 'legacy' VB6 function.

[Jay1b]

Cheers.