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vrf Redirection from screen

Question asked by VRFuser on Dec 1, 1999

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Hi All.

[Redirecting standard output without using a file]
> Oh. Well, yes, but it's a pain.

Yeah, well it's more of a pain than I realized at first. Memory mapped files
won't do it -- one has to use anonymous pipes. All the simple methods I've
tried have failed so this is now delegated to a Sunday morning project. As
long as I can find a method that works before kick-off I'll post it for
y'all Monday.

Shawn Fessenden
Mgr., Technical Support
Oswego Software, Inc.
mailto:shawn@oswegosw.com
http://www.oswegosw.com

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VRFuser Nov 24, 1999 2:18 PM

Is there a way to redirect text, generated by a DOS command, from the
screen to a VEE application?

ie, if I use the DOS command "ping", I get an output to the screen. I
would like to use this info in an application without redirecting to a
text
file (>filename.txt), then reading into the application.

Thanx
Iain Hamilton

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VRFuser Nov 28, 1999 7:56 PM

Hi Iain.

> Is there a way to redirect text,
> generated by a DOS command, from
> the screen to a VEE application?

Sure! Just redirect it to a file and read the file in VEE.

> without redirecting to a text
> file (>filename.txt)

Oh. Well, yes, but it's a pain. The basic operation goes like so: start a
console and use SetStdHandle to set it's standard input, output and error
devices to memory mapped files. You can then inject commands through the
input handle and capture output through the standard and error output
handles. Don't worry if that sounds weird.

This sounds like a fun thing to do so I'm going to do it. Unfortunately I
have to split right now so I won't be able to do anything about it 'til
tomorrow.

I'm thinking that the VEE interface would pass three strings: command to
execute, and a string buffer each for standard output and error output. The
result of the call will be pass / fail. A fourth parameter will be
equivalent to "wait for prog to exit" on the Execute Program object.

int DoCommand(char *pCmd, char *pOut, char *pErr, int bWait);

I'll publish the code, dll and an example when I get back in town (hopefully
day after tomorrow).

Shawn Fessenden
Mgr., Technical Support
Oswego Software, Inc.
mailto:shawn@oswegosw.com
http://www.oswegosw.com

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2 Replies

VRFuser Nov 24, 1999 2:18 PM
Mark Correct
Correct Answer

Is there a way to redirect text, generated by a DOS command, from the
screen to a VEE application?

ie, if I use the DOS command "ping", I get an output to the screen. I
would like to use this info in an application without redirecting to a
text
file (>filename.txt), then reading into the application.

Thanx
Iain Hamilton

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VRFuser Nov 28, 1999 7:56 PM
Mark Correct
Correct Answer
Hi Iain.

> Is there a way to redirect text,
> generated by a DOS command, from
> the screen to a VEE application?

Sure! Just redirect it to a file and read the file in VEE.

> without redirecting to a text
> file (>filename.txt)

Oh. Well, yes, but it's a pain. The basic operation goes like so: start a
console and use SetStdHandle to set it's standard input, output and error
devices to memory mapped files. You can then inject commands through the
input handle and capture output through the standard and error output
handles. Don't worry if that sounds weird.

This sounds like a fun thing to do so I'm going to do it. Unfortunately I
have to split right now so I won't be able to do anything about it 'til
tomorrow.

I'm thinking that the VEE interface would pass three strings: command to
execute, and a string buffer each for standard output and error output. The
result of the call will be pass / fail. A fourth parameter will be
equivalent to "wait for prog to exit" on the Execute Program object.

int DoCommand(char *pCmd, char *pOut, char *pErr, int bWait);

I'll publish the code, dll and an example when I get back in town (hopefully
day after tomorrow).

Shawn Fessenden
Mgr., Technical Support
Oswego Software, Inc.
mailto:shawn@oswegosw.com
http://www.oswegosw.com

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vrf Redirection from screen

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