how to write embeded if statement

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thinktwice - 19 Jun 2008 14:13 GMT

i have written something like:
if not (%1) == () (
if not %1 == "" (set SENDER=%1))

but it doesn't work, it's invalid if statement

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Tom Lavedas - 19 Jun 2008 14:35 GMT

> i have written something like:
> if not (%1) == () (
> if not %1 == "" (set SENDER=%1))
>
> but it doesn't work, it's invalid if statement

This one is tricky - it took a minute to figure out. Even though it
appears that the blank condition of the replaceable parameter, %1, is
being tested; the syntax of the second part of your compound statement
is being parsed, anyway. This is because the command processor is a
single pass processor and the parentheses make the multiple lines a
single statement (all of which is evaluated at one time). Therefore,
if %1 is empty, a syntax error results.

Try something like this ...

if not (%1) == () (
if not [%1] == [""] (set SENDER=%1))

Tom Lavedas
===========
http://members.cox.net/tglbatch/wsh/

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Dean Wells (MVP) - 19 Jun 2008 15:14 GMT

>i have written something like:
> if not (%1) == () (
> if not %1 == "" (set SENDER=%1))
>
> but it doesn't work, it's invalid if statement

What are you trying to determine by the condition?

... I can guess of course, but I'd like to make sure I'm not incorrectly
inferring your goal.

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Dean Wells [MVP / Directory Services]
MSEtechnology
[[ Please respond to the Newsgroup only regarding posts ]]
R e m o v e t h e m a s k t o s e n d e m a i l

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thinktwice - 20 Jun 2008 05:30 GMT

On 6月19日, 下午10时14分, "Dean Wells \(MVP\)"
<dwe...@maskmsetechnology.com> wrote:

> >i have written something like:
> > if not (%1) == () (
[quoted text clipped - 12 lines]
> [[ Please respond to the Newsgroup only regarding posts ]]
> R e m o v e t h e m a s k t o s e n d e m a i l

thanks for you help, i'm trying to make sure the parameter that passed
to my batch file isn't empty nor ""

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Al Dunbar - 20 Jun 2008 06:13 GMT

On 6ÔÂ19ÈÕ, ÏÂÎç10Ê±14·Ö, "Dean Wells \(MVP\)"
<dwe...@maskmsetechnology.com> wrote:

> "thinktwice" <memorial...@gmail.com> wrote in message
>
[quoted text clipped - 16 lines]
> [[ Please respond to the Newsgroup only regarding posts ]]
> R e m o v e t h e m a s k t o s e n d e m a i l

thanks for you help, i'm trying to make sure the parameter that passed
to my batch file isn't empty nor ""

try this, then:

if "%~1" EQU "" (
echo/first parameter is either empty (null, missing) or ""
) else (
echo/an actual non-null value was passed as the first parameter.
)

This can sometimes be useful too:

(set _param=%~1)
if defined _param (
echo/an actual non-null value was passed as the first parameter.
) else (
echo/first parameter is either empty (null, missing) or ""
)

/Al

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