Console application. Console.Clear = IOException

[Dinsdale]

I am writing a small console application that runs fine unless I am re-
directing the output to a file (i.e. c:\ app.exe >>output.txt) . I
have determined that the issue is caused by the Console.Clear()
function. When piping to a file, the console.clear causes the
following error:

Unhandled Exception: System.IO.IOExc eption: The handle is invalid.

at System.IO.IO__E rror.WinIOError (Int32 errorCode, String
maybeFullPath)
at System.Console. Clear()
....

Is there any way to determine where my output is being directed so
that I can skip over the Console.Clear command if I am re-directing
stdOut?

The other side of the error is with input. I prompt the user at one or
two points but if the output is re-directed, I would like to simply
skip the prompt. Again, this would be possible if I can determine
where standard output is going.

Thanks!
Dinsdale

[Dinsdale]

Re: Console application. Console.Clear = IOException

On Feb 28, 2:51 pm, Dinsdale <russ.ha...@gma il.comwrote:

I am writing a small console application that runs fine unless I am re-
directing the output to a file (i.e. c:\ app.exe >>output.txt) . I
have determined that the issue is caused by the Console.Clear()
function. When piping to a file, the console.clear causes the
following error:
>
Unhandled Exception: System.IO.IOExc eption: The handle is invalid.
>
at System.IO.IO__E rror.WinIOError (Int32 errorCode, String
maybeFullPath)
at System.Console. Clear()
...
>
Is there any way to determine where my output is being directed so
that I can skip over the Console.Clear command if I am re-directing
stdOut?
>
The other side of the error is with input. I prompt the user at one or
two points but if the output is re-directed, I would like to simply
skip the prompt. Again, this would be possible if I can determine
where standard output is going.
>
Thanks!
Dinsdale

So did nobody answer this because I am stupid and totally missed
something obvious? Seriously, hints anyone???

[Tom Shelton]

Re: Console application. Console.Clear = IOException

On Feb 28, 1:51 pm, Dinsdale <russ.ha...@gma il.comwrote:

I am writing a small console application that runs fine unless I am re-
directing the output to a file (i.e. c:\ app.exe >>output.txt) . I
have determined that the issue is caused by the Console.Clear()
function. When piping to a file, the console.clear causes the
following error:
>
Unhandled Exception: System.IO.IOExc eption: The handle is invalid.
>
at System.IO.IO__E rror.WinIOError (Int32 errorCode, String
maybeFullPath)
at System.Console. Clear()
...
>
Is there any way to determine where my output is being directed so
that I can skip over the Console.Clear command if I am re-directing
stdOut?
>
The other side of the error is with input. I prompt the user at one or
two points but if the output is re-directed, I would like to simply
skip the prompt. Again, this would be possible if I can determine
where standard output is going.
>
Thanks!
Dinsdale

AFIK, there is no way to tell if you have been redirected. Sorry.

--
Tom Shelton

[Michael D. Ober]

Re: Console application. Console.Clear = IOException

"Tom Shelton" <tom_shelton@co mcast.netwrote in message
news:2bcea0a4-d0fd-4d85-aa26-4c5e8b35c152@e3 9g2000hsf.googl egroups.com...
On Feb 28, 1:51 pm, Dinsdale <russ.ha...@gma il.comwrote:

I am writing a small console application that runs fine unless I am re-
directing the output to a file (i.e. c:\ app.exe >>output.txt) . I
have determined that the issue is caused by the Console.Clear()
function. When piping to a file, the console.clear causes the
following error:
>
Unhandled Exception: System.IO.IOExc eption: The handle is invalid.
>
at System.IO.IO__E rror.WinIOError (Int32 errorCode, String
maybeFullPath)
at System.Console. Clear()
...
>
Is there any way to determine where my output is being directed so
that I can skip over the Console.Clear command if I am re-directing
stdOut?
>
The other side of the error is with input. I prompt the user at one or
two points but if the output is re-directed, I would like to simply
skip the prompt. Again, this would be possible if I can determine
where standard output is going.
>
Thanks!
Dinsdale

You can't do it directly from the framework. However, take a look at

http://msdn.microsoft.com/archive/default.asp?url=/archive/en-us/dnaraskdr/html/askgui07152003.asp

for information detecting redirection. Personally, I would wrap my
Console.Clear() function inside a small sub as follows:

public Sub ClearConsole()
static failed as boolean = false
if failed then exit sub

try
system.Console. Clear()
catch
failed = true
end try
end sub

Mike.

[Tom Shelton]

Re: Console application. Console.Clear = IOException

On Mar 11, 7:26 pm, "Michael D. Ober" <obermd.@.alum. mit.edu.nospam. >
wrote:

"Tom Shelton" <tom_shel...@co mcast.netwrote in message
>
news:2bcea0a4-d0fd-4d85-aa26-4c5e8b35c152@e3 9g2000hsf.googl egroups.com...
On Feb 28, 1:51 pm, Dinsdale <russ.ha...@gma il.comwrote:
>
>
>
>
>

I am writing a small console application that runs fine unless I am re-
directing the output to a file (i.e. c:\ app.exe >>output.txt) . I
have determined that the issue is caused by the Console.Clear()
function. When piping to a file, the console.clear causes the
following error:

>

Unhandled Exception: System.IO.IOExc eption: The handle is invalid.

>

at System.IO.IO__E rror.WinIOError (Int32 errorCode, String
maybeFullPath)
at System.Console. Clear()
...

>

Is there any way to determine where my output is being directed so
that I can skip over the Console.Clear command if I am re-directing
stdOut?

>

The other side of the error is with input. I prompt the user at one or
two points but if the output is re-directed, I would like to simply
skip the prompt. Again, this would be possible if I can determine
where standard output is going.

>

Thanks!
Dinsdale

>
You can't do it directly from the framework.  However, take a look athttp://msdn.microsoft. com/archive/default.asp?url =/archive/en-us/dnar...

Hey, Michael - good find. I wasn't aware of the PeekConsoleInpu t
trick... This may actually be what the OP needs, because he also
wants to not display the prompt....

--
Tom Shelton