Solved

how to get a length of string with DOS commands

Posted on 2009-05-14
6
409 Views
Last Modified: 2013-11-29
In c, there is  a function called strlen(str1). How to get a string length in DOS commands. For example, str1= This is a test.
The length of str1 is 16.
0
Comment
Question by:jl66
  • 3
  • 2
6 Comments
 
LVL 84

Accepted Solution

by:
oBdA earned 260 total points
ID: 24388802
See the subroutine below.
You'll need the "setlocal enabledelayedexpansion" at the beginning of your script, and the function at the end.
Add whatever you want inbetween.

@echo off
setlocal enabledelayedexpansion
set Var=This is a test.
call :StrLen VarLength "%Var%"
echo Length of "%Var%": %VarLength%
 
REM ----------------------------------------
REM Function StrLen
REM %1: Variable name in which to return the length of the string
REM %2: The string
REM Returns: Length of the string in the variable passed as %1
goto :eof
:StrLen
if "%~2"=="" (set %1=0 & goto :eof)
set /a i = 0 & set _TempStr_=%~2
:LengthLoop
if "!_TempStr_:~%i%,1!"=="" (set %1=%i% & goto :eof) else (set /a i+=1 & goto :LengthLoop)
REM ----------------------------------------

Open in new window

0
 
LVL 21

Assisted Solution

by:AmazingTech
AmazingTech earned 240 total points
ID: 24389142
You can do it like this too.
@echo off
Set str1= This is a test.
 
Set Length=
for /l %%a in (0,1,30) do if "!str1:~%%a,1!" == "" if not defined Length Set Length=%%a
 
ECHO The length of str1 is %Length%.

Open in new window

0
 
LVL 16

Expert Comment

by:t0t0
ID: 24390784
AmazingTech

You forgot to expand your variables...

@echo off
SETLOCAL ENABLEDELAYEDEXPANSION
Set str1= This is a test.
 
Set Length=
for /l %%a in (0,1,30) do if "!str1:~%%a,1!" == "" if not defined Length Set Length=%%a
 
ECHO The length of str1 is %Length%.
0
Easy, flexible multimedia distribution & control

Coming soon!  Ideal for large-scale A/V applications, ATEN's VM3200 Modular Matrix Switch is an all-in-one solution that simplifies video wall integration. Easily customize display layouts to see what you want, how you want it in 4k.

 
LVL 16

Expert Comment

by:t0t0
ID: 24391356
@echo off
setlocal enabledelayedexpansion

set string=This is a string of characters

set /a i=0
if defined string (
   :loop
   if not "!string:~%i%,1!"=="" (
      set /a i+=1
      goto :loop
   )
)

echo %i%
0
 
LVL 21

Expert Comment

by:AmazingTech
ID: 24393210
Oh yes you're right t0t0.

I was unfortunately playing around in a command prompt started with /v:on.
0
 
LVL 16

Expert Comment

by:t0t0
ID: 24393764
i understand AmazingTech..... I often do it myself. And the biggest forgetter for me is the '/a' in set.

I could have swore my last example would have done the trick just nicely! Oh well, for the record,  heres a 'condensed' version....

@echo off
setlocal enabledelayedexpansion
set string=This is a string of characters

set /a i=0 & if defined string (
   :loop
   if not "!string:~%i%,1!"=="" set /a i+=1 & goto :loop
)
echo %i%

You win some, you lose some.....
0

Featured Post

Connect further...control easier

With the ATEN CE624, you can now enjoy a high-quality visual experience powered by HDBaseT technology and the convenience of a single Cat6 cable to transmit uncompressed video with zero latency and multi-streaming for dual-view applications where remote access is required.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Storage devices are generally used to save the data or sometime transfer the data from one computer system to another system. However, sometimes user accidentally erased their important data from the Storage devices. Users have to know how data reco…
A Bare Metal Image backup allows for the restore of an entire system to a similar or dissimilar hardware. They are highly useful for migrations and disaster recovery. Bare Metal Image backups support Full and Incremental backups. Differential backup…
As developers, we are not limited to the functions provided by the VBA language. In addition, we can call the functions that are part of the Windows operating system. These functions are part of the Windows API (Application Programming Interface). U…
This Micro Tutorial will give you a basic overview of Windows DVD Burner through its features and interface. This will be demonstrated using Windows 7 operating system.

861 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question