Bat files Grrrrrrrrrr!

[Rainstorm]

Hi.
just having a prob with this, don't know much about bat files.
when there is no %1 the if doesn't seem to trigger, when it should.

I've just dloaded windows power shell for Xp.- gonna give it a look.. & maybe just dump this & use that.

thanks!

Code Select Expand

@echo off

set lpath=%~dp0
echo path = %lpath%
pause

if "%1" == "" (
echo if triggered
set lpath=%~n0
echo lpath - %lpath%
) else (
echo else triggered
pause
)

EDITED : changed the curly braces to parentheses

[ToutEnMasm]

OH,
If i am a batch file , i used %1 %2 ...%N to design the arguments in the command line.
The %1 is the first word in the command line ,the %2 the second word....
What is %~dp0 in this enumeration ?,I don't know.

The { seems to be only used in c++

Seems you need some samples and a help file before writing a batch
http://www.computerhope.com/batch.htm

[Jimg]

Wow have things changed since the last time I used batch files.


I changed the curly braces to parens and it worked as expected.

[Rainstorm]

ToutenAsm >>

What is %~dp0 in this enumeration ?,I don't know.
The { seems to be only used in c++

The '}' was an error I corrected it , I know nothing of C++ anyhow - the problem is still the same though.

%~dp0 means,  return just the drive & path of the batchfile.
%~n0 would return just the name
%~n1 would return only the name in the 1st argument (assuming it was a filepath)
etc. . . .

[Rainstorm]

still doesn't work here.. when i double click the file.
%1 is nothing.. so am expecting it to trigger the if statement & the echo in the if statement should display.(I've echoed %1 to be sure)
-- using Winxp pro -SP2

[edit] Jimq ; which version of windows are you running ?

[Jimg]

double click the file???????

Drop to a command prompt and run it!

Im using XP SP2 also pro.


Okay, I added an extra pause at the very end and double clicked on the batch file, and it seems to work.

You know lpath only holds for that one run, right?

[Rainstorm]

 no way i can get it to work the same way.. by double clicking ?
If i run it from a command prompt it works as expected

edit::  guess i cross posted ; )
just read yuor reply.., dunnow hy the pause helped but double clicking works here too now

thanks!!

[Jimg]

What are you trying to accomplish?  I assumed this was just a test for something bigger.  Are you trying to permanently set an environment variable?

[Rainstorm]

I was just writing some bat files to handle some of teh basic assembly commandline stuff in convenient ways.. this was a section of that code i was working on that..was giving a problem.
not setting an environment variable.

edit: as to why the pause helped, just realised there wasn't a 'pause' after the echo in the if ; )

t  y

[Jimg]

The environment variable you set should be good throughout the command session you initiate by double-clicking the bat file.

It should work for what you are doing.  There must be a different problem.

[Rainstorm]

it works now.. so far in what i tried  :thumbu

[jj2007]

A variant.

Code Select Expand

@echo off
echo.
echo.
echo.

if 0%1==0 (
echo arg1 is empty
set lpath=%~n0
echo lpath - %lpath%
) else (
echo This is arg1: %1
)


[Rainstorm]

jj nice one  :thumbu, i'll remember that.. : )

t y

[askm]

REM Some example lines in a *.bat of mine...

If {%1}=={} @echo No parameter specified.&goto :EOF

If exist "%1.obj" del "%1.obj"
If exist "%1.exe" del "%1.exe"
If exist "%~dpn1.obj" del "%~dpn1.obj"
If exist "%~dpn1.exe" del "%~dpn1.exe"

REM pause

If exist "%1.cpp" goto cpp
If {"%~x1"}=={".cpp"} goto cpp

If exist "%1.cc" goto cc
If {"%~x1"}=={".cc"} goto cc

If {"%~x1"}=={".c"} goto noaddc

If not {%2} == {} echo %2
If not {%3} == {} echo %3
If not {%4} == {} echo %4
If not {%5} == {} echo %5

:cpp

:cc

:noaddc

pause