Exception Catch but dont throw

[Miro]

I cant seem to find an example on how to do something, ( vb2005.express )

i have a

Try
ListeningSerialPort.Open()
TestText.Enabled = True
Catch ex As Exception
'Debug.WriteLine(ex.Message)
End Try

<morecodehere>...

statement, and what I am tryign to do is Catch the exception ( which it
does ) but i dont want to throw it anywhere.

How do I get this try catch to continue gracefully so if an exception is
caught, the "more code here" gets executed and continues on - the user never
sees that an exception was hit and they do not know the difference?

Currently when I compile / and create a setup.exe with the publish and
install it, the program hits a fatal exception -displays it to the user and
fails. If I run the same program in vb.net express, then this does not
happen, it shows the exception in the immediate window but lets me continue.
Am I missing something with the Try Catch statement ?

I hope that makes sence.

Miro

[rowe_newsgroups]

On Aug 1, 12:03 pm, "Miro" <[e-mail]:

I cant seem to find an example on how to do something, ( vb2005.express )

i have a

Try
ListeningSerialPort.Open()
TestText.Enabled = True
Catch ex As Exception
'Debug.WriteLine(ex.Message)
End Try

<morecodehere>...

statement, and what I am tryign to do is Catch the exception ( which it
does ) but i dont want to throw it anywhere.

How do I get this try catch to continue gracefully so if an exception is
caught, the "more code here" gets executed and continues on - the user never
sees that an exception was hit and they do not know the difference?

Currently when I compile / and create a setup.exe with the publish and
install it, the program hits a fatal exception -displays it to the user and
fails. If I run the same program in vb.net express, then this does not
happen, it shows the exception in the immediate window but lets me continue.
Am I missing something with the Try Catch statement ?

I hope that makes sence.

Miro

Your current try catch should "continue gracefully" on any Exception
object - so I'm not sure why it isn't. You might try omitting the "ex
as exception" part - this will cause it to trap all but a few really
nasty (and normally non-recoverable) exceptions.

i.e.

Try
...
Catch
...
End Try

Also, are you sure the exception is from this method? Perhaps you are
hitting a security exception or something before you make it to the
above code?

Thanks,

Seth Rowe

[Miro]

The "Catch" on its own did not work.

I have changed it to be this and i still get the error.
====
Debug.WriteLine("b4exp")
Try
ListeningSerialPort.Close()
Catch extry As System.UnauthorizedAccessException
Debug.WriteLine("cought it")
Catch ex As Exception
Debug.WriteLine("other caught it")
End Try
Debug.WriteLine("aftb4exp")
===
my output is as follows in the immedate window
b4exp
A first chance exception of type 'System.UnauthorizedAccessException'
occurred in System.dll
cought it
aftb4exp
====

I cant seem to get around it from it throwing that exception. Any other
ideas?

What I am basically doing is i have a proximety scanner hooked up thru a usb
to my computer.
In the begining what I do is
if serial.isopen() = false then serial.open()

then what I do is i unplug the usb.
The problem is that when I unplug the usb isopen still returns True, so
what I do is I have a timer and every so many seconds and i then
Dim CurrentAvailPorts As Array = SerialPort.GetPortNames()
and compare what port names are available to the ones I THINK that are open,
and if they are actaully not anymore ( by GetPortNames() ) I try to close
them. Thats where the error is occuring.

That way, every so many seconds...when GetPortNames does return my ComPort
that was opened and is available again - I re-open it.

The Part that is failing is the "closing" of the port when the usb is
unplugged.
Any other Ideas?

Thanks

Miro

"rowe_newsgroups" <ro********@yahoo.comwrote in message
news:11**********************@l70g2000hse.googlegr oups.com...

On Aug 1, 12:03 pm, "Miro" <[e-mail]:

>I cant seem to find an example on how to do something, ( vb2005.express )

i have a

Try
ListeningSerialPort.Open()
TestText.Enabled = True
Catch ex As Exception
'Debug.WriteLine(ex.Message)
End Try

<morecodehere>...

statement, and what I am tryign to do is Catch the exception ( which it
does ) but i dont want to throw it anywhere.

How do I get this try catch to continue gracefully so if an exception is
caught, the "more code here" gets executed and continues on - the user
never
sees that an exception was hit and they do not know the difference?

Currently when I compile / and create a setup.exe with the publish and
install it, the program hits a fatal exception -displays it to the user
and
fails. If I run the same program in vb.net express, then this does not
happen, it shows the exception in the immediate window but lets me
continue.
Am I missing something with the Try Catch statement ?

I hope that makes sence.

Miro

Your current try catch should "continue gracefully" on any Exception
object - so I'm not sure why it isn't. You might try omitting the "ex
as exception" part - this will cause it to trap all but a few really
nasty (and normally non-recoverable) exceptions.

i.e.

Try
...
Catch
...
End Try

Also, are you sure the exception is from this method? Perhaps you are
hitting a security exception or something before you make it to the
above code?

Thanks,

Seth Rowe

[Patrice]

I'm not sure what is the exact problem.

Debug messages are show in the debug console to developers (my understanding
is that you don't want to see the exception message in the debug output
???). It doesn't mean an end user would see this in the final build.

The exception is ALWAYS throw. What matter is if it is handled (in which
case you do whatever you want includuing not showing it to the end user) or
undhandled (in which case the .NET runtime will show the error) ? The
exception always happend and the dbeug outpuit always show that an exception
occured.

Not familiar with this class but always prefer a check to throwing exception
(tha is if you have a method/proerty that allows to check the port status
prefer checking the status so that you know if you can close to catching
exceptions).

--
Patrice

"Miro" <mi******@golden.neta écrit dans le message de news:
%2****************@TK2MSFTNGP06.phx.gbl...

The "Catch" on its own did not work.

I have changed it to be this and i still get the error.
====
Debug.WriteLine("b4exp")
Try
ListeningSerialPort.Close()
Catch extry As System.UnauthorizedAccessException
Debug.WriteLine("cought it")
Catch ex As Exception
Debug.WriteLine("other caught it")
End Try
Debug.WriteLine("aftb4exp")
===
my output is as follows in the immedate window
b4exp
A first chance exception of type 'System.UnauthorizedAccessException'
occurred in System.dll
cought it
aftb4exp
====

I cant seem to get around it from it throwing that exception. Any other
ideas?

What I am basically doing is i have a proximety scanner hooked up thru a
usb to my computer.
In the begining what I do is
if serial.isopen() = false then serial.open()

then what I do is i unplug the usb.
The problem is that when I unplug the usb isopen still returns True, so
what I do is I have a timer and every so many seconds and i then
Dim CurrentAvailPorts As Array = SerialPort.GetPortNames()
and compare what port names are available to the ones I THINK that are
open, and if they are actaully not anymore ( by GetPortNames() ) I try to
close them. Thats where the error is occuring.

That way, every so many seconds...when GetPortNames does return my ComPort
that was opened and is available again - I re-open it.

The Part that is failing is the "closing" of the port when the usb is
unplugged.
Any other Ideas?

Thanks

Miro

"rowe_newsgroups" <ro********@yahoo.comwrote in message
news:11**********************@l70g2000hse.googlegr oups.com...

>On Aug 1, 12:03 pm, "Miro" <[e-mail]:

>>I cant seem to find an example on how to do something, (
vb2005.express )

i have a

Try
ListeningSerialPort.Open()
TestText.Enabled = True
Catch ex As Exception
'Debug.WriteLine(ex.Message)
End Try

<morecodehere>...

statement, and what I am tryign to do is Catch the exception ( which it
does ) but i dont want to throw it anywhere.

How do I get this try catch to continue gracefully so if an exception is
caught, the "more code here" gets executed and continues on - the user
never
sees that an exception was hit and they do not know the difference?

Currently when I compile / and create a setup.exe with the publish and
install it, the program hits a fatal exception -displays it to the user
and
fails. If I run the same program in vb.net express, then this does not
happen, it shows the exception in the immediate window but lets me
continue.
Am I missing something with the Try Catch statement ?

I hope that makes sence.

Miro

Your current try catch should "continue gracefully" on any Exception
object - so I'm not sure why it isn't. You might try omitting the "ex
as exception" part - this will cause it to trap all but a few really
nasty (and normally non-recoverable) exceptions.

i.e.

Try
...
Catch
...
End Try

Also, are you sure the exception is from this method? Perhaps you are
hitting a security exception or something before you make it to the
above code?

Thanks,

Seth Rowe