1.

Solve : Is there a way to detect a carriage return from user input??

Answer»

Hello,

I was trying to create a simple batch file to lookup WHOIS information for website addresses.

Here's what I have so far.

@echo off

:INPUT1

cls
echo.
echo.
echo.
set/p "input1=> ENTER THE WEBSITE ADDRESS > "
whois %input1%
pause

:INPUT2

cls
echo.
echo.
echo.
set/p "input2=> WOULD YOU LIKE TO LOOK UP ANOTHER ADDRESS? (Y/N?) > "
if %input2%==Y goto INPUT1
if %input2%==y goto INPUT1
if %input2%==N goto END
if %input2%==n goto END
goto INPUT2

:END

exit

It works fine except for one thing. When it ASKS, "WOULD YOU LIKE TO LOOK UP ANOTHER ADDRESS? (Y/N?) >", if you hit the Enter/Return key it EXITS the program instead of being detected as an incorrect input, not (Y,y,N, or n), and sent back to INPUT2, to re-ask the question again.

If you hit another letter like G, it handles the error correctly, but it can't handle a carriage return.

How can I detect the carriage return as an error and send it back to re-ask the question again?Try this

Code: [Select]:INPUT2

cls
echo.
echo.
echo.


set input2=error


set/p "input2=> WOULD YOU LIKE TO LOOK UP ANOTHER ADDRESS? (Y/N?) > "
if %input2%==Y goto INPUT1
if %input2%==y goto INPUT1
if %input2%==N goto END
if %input2%==n goto END
goto INPUT2

:END
With the variable preset with a value, just pressing return should not change anything so will still hold "error" and be flagged as invalidYour program looks alright.
There is no test for CR m so it just loops again.
It only goes to the end if you hit N or n.
What does this mean?
Quote

If you hit another letter like G, it handles the error correctly, but it can't handle a carriage return.
Both are handled that same way.
Why do you say it does not handle the CR correctly?
G is not Y or y or N or n. And neither is CR.
Anything other than Y y N n loops in INPUT2.

Quote from: Geek-9pm on January 14, 2010, 12:46:32 PM
Your program looks alright.
There is no test for CR m so it just loops again.
It only goes to the end if you hit N or n.
What does this mean?Both are handled that same way.
Why do you say it does not handle the CR correctly?
G is not Y or y or N or n. And neither is CR.
Anything other than Y y N n loops in INPUT2.
EDIT: I stand corrected. CR retains the last value.If you have set /p answer=Prompt? and the user hits ENTER, the test "%answer%"=="" returns true
No, teh CR does not git a null.
gpl got it right.
You have to set the thing to a null before you make the test.
Only then CR will give null, because it already was null.Quote from: Geek-9pm on January 14, 2010, 03:23:34 PM
You have to set the thing to a null before you make the test.
Only then CR will give null, because it already was null.

You mean like this?

Code: [Select]@echo off
set answer=&set /p answer=Your input?
if "%answer%"=="" (
echo String: ENTER
) else (
echo String: %answer%
) But we need a loop to verify it.
set answer=&set /p does clear it to null, otherwise it would retain its prior value when the user hits return

Code: [Select]@ECHO QUIT or PARTY
@ECHO OFF
:PARTY1
set answer=&set /p answer=Your input ?

IF "%answer%"=="" (
echo ENTER
) ELSE (
echo %answer%
)
if "%answer%"=="PARTY" (
goto PARTY1
)

Thank You!@OP, don't have to make things so complicated. Use an infinity loop. something like this.
Code: [Select]:LOOP
1) ask for input
2) if input not "Y", "y","N","n" blah
-- goto LOOP
3) else breakHey guys,

Thanks for all of the replies and suggestions.

gpl's suggestion seemed the simplest to implement. I added the line below exactly where he said to, and the program works perfectly now, thanks to all of you, but special thanks to gpl.

Quote from: gpl on January 14, 2010, 12:40:50 PM

set input2=error

For anybody who is interested in creating a program to view website address information here is my final version.

You'll need to download the WHOIS utility from here

http://technet.microsoft.com/en-us/sysinternals/bb897435.aspx

Place the WHOIS.exe in the

C:\WINDOWS\system32

folder

Create a new .txt file on the desktop

Paste the code below into the .txt file


echo off


title WHOIS LOOKUP


::INPUT 1 SCREEN

:INPUT1

cls
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
set/p "input1=> ENTER THE WEBSITE ADDRESS > "


::LOOKUP SCREEN

:LOOKUP

cls
WHOIS %input1%
pause


::INPUT 2 SCREEN

:INPUT2

cls
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
echo.
set input2=error

set/p "input2=> WOULD YOU LIKE TO LOOK UP ANOTHER ADDRESS? (Y/N?) > "
if %input2%==Y goto YES
if %input2%==y goto YES
if %input2%==N goto END
if %input2%==n goto END
goto INPUT2


:YES

goto INPUT1


:END

exit


Change the .txt extention to .bat

Once you run it, you might want to change the command prompt properties to view it fullscreen.

Right-click on the blue title-bar at the top of the command prompt window, select Properties, then the Options tab.

Select the Window radial button.

Select the Layout tab.

Set the Screen Buffer Size: Width to 100, Height to 100.

Set the Window Size: Width to 125, Height to 54

Set the Window Position: Width to 0, Height to 0

Those settings seem to fit a 1024 x 768 screen well.

Here is an example of what is displayed if you look up www.yahoo.com


Whois v1.01 - Domain information lookup utility
Sysinternals - www.sysinternals.com
Copyright (C) 2005 Mark Russinovich

Connecting to COM.whois-servers.net...
Connecting to COM.whois-servers.net...
Connecting to whois.markmonitor.com...


MarkMonitor is the Global Leader in Enterprise Brand Protection.

Domain Management
MarkMonitor Brand ProtectionΓäó
AntiFraud Solutions
Corporate Consulting Services

Visit MarkMonitor at www.markmonitor.com
Contact us at 1 800 745 9229
In Europe, at +44 (0) 20 7840 1300


The Data in MarkMonitor.com's WHOIS database is provided by MarkMonitor.com
for information purposes, and to assist persons in obtaining information
about or related to a domain name registration record. MarkMonitor.com
does not guarantee its accuracy. By submitting a WHOIS query, you agree
that you will use this Data only for lawful purposes and that, under no
circumstances will you use this Data to: (1) allow, enable, or otherwise
support the transmission of mass unsolicited, commercial advertising or
solicitations via e-mail (spam); or (2) enable high volume, automated,
electronic processes that apply to MarkMonitor.com (or its systems).
MarkMonitor.com reserves the right to modify these terms at any time.
By submitting this query, you agree to abide by this policy.

Registrant:
Domain Administrator
Yahoo! Inc.
701 First Avenue
Sunnyvale CA 94089
US
[emailprotected] +1.4083493300 Fax: +1.4083493301

Domain Name: yahoo.com

Registrar Name: Markmonitor.com
Registrar Whois: whois.markmonitor.com
Registrar Homepage: http://www.markmonitor.com

Administrative Contact:
Domain Administrator
Yahoo! Inc.
701 First Avenue
Sunnyvale CA 94089
US
[emailprotected] +1.4083493300 Fax: +1.4083493301
Technical Contact, Zone Contact:
Domain Administrator
Yahoo! Inc.
701 First Avenue
Sunnyvale CA 94089
US
[emailprotected] +1.4083493300 Fax: +1.4083493301

Created on..............: 1995-01-18.
Expires on..............: 2012-01-18.
Record last updated on..: 2009-12-02.

Domain servers in listed order:

ns5.yahoo.com
ns3.yahoo.com
ns2.yahoo.com
ns1.yahoo.com
ns4.yahoo.com




MarkMonitor is the Global Leader in Enterprise Brand Protection.

Domain Management
MarkMonitor Brand ProtectionΓäó
AntiFraud Solutions
Corporate Consulting Services

Visit MarkMonitor at www.markmonitor.com
Contact us at 1 800 745 9229
In Europe, at +44 (0) 20 7840 1300
--

Press any key to continue . . .

Pretty cool huh?

Well thanks to everybody for the help, and I hope that my little program simplifies looking up website information with the WHOIS utility for somebody out there.


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