murillo@sigi.Colorado.EDU (Rodrigo Murillo) (03/14/88)
Does someone out there know how to set the DOS errorlevel number
in C? I want to write a batch file that can branch according to the
value of this number:
if errorlevel 1 echo Big...
if errorlevel 2 echo Bigger...
if errorlevel 3 echo Biggest.
Please send code fragments if possible.
--
_______________________________________________________________________________
Rodrigo Murillo, University of Colorado - Boulder (303) 761-0410
murillo@boulder.colorado.edu | ..{hao|nbires}!boulder!murillo
( Machines have less problems. I'd like to be a machine. -- Andy Worhol )wew@naucse.UUCP (Bill Wilson) (03/16/88)
That will depend upon your C compiler. Normally all you have to do is return an integer number in the exit function. i.e. exit(1); will return a 1 for the error level upon completion of the program. Bill Wilson.
everett@hpcvlx.HP.COM (Everett Kaser) (03/17/88)
It's set automatically by the 'exit' function; i.e.,
exit(0); exits and sets ERRORLEVEL to 0
exit(1); exits and sets ERRORLEVEL to 1
exit(2); exits and sets ERRORLEVEL to 2
I hope you see the trend here. :-)berger@clio.las.uiuc.edu (03/17/88)
This depends on what C compiler you're using. In DeSmet C, you just
invoke exit(errorlevel) to exit the program and set errorlevel. I
think it works the same in Computer Innovations C-86.
Mike Berger
Department of Statistics
Science, Technology, and Society
University of Illinois
berger@clio.las.uiuc.edu
{ihnp4 | convex | pur-ee}!uiucuxc!clio!bergermadd@bu-cs.BU.EDU (Jim Frost) (03/17/88)
In article <4831@sigi.Colorado.EDU> murillo@boulder.Colorado.EDU (Rodrigo Murillo) writes: >Does someone out there know how to set the DOS errorlevel number >in C? I want to write a batch file that can branch according to the >value of this number: > > if errorlevel 1 echo Big... > if errorlevel 2 echo Bigger... > if errorlevel 3 echo Biggest. > >Please send code fragments if possible. You're going to get a million of these, but I thought I'd add to your mail. The answer is so obvious that it's often missed. DOS ERRORLEVEL is nothing but a check of the return code for a program (as specified when function 4CH Terminate a program (EXIT) is called). The IBM Disk Operating System Technical Manual says: Purpose: Terminates the current process and transfers control to the invoking process. On Entry Register Contents AH 4CH AL Return code On Return Register Contents NONE Remarks: In addition, a return code can be sent. The return code can be interrogated by the batch subcommands IF and ERRORLEVEL and by the wait function call 4DH. All files opened by the process are closed. In C on the PC, the return code is an optional argument to the exit() command. Thus, exit(2) will return ERRORLEVEL 2. Happy hacking, jim frost madd@bu-it.bu.edu
bobmon@iuvax.cs.indiana.edu (RAMontante) (03/17/88)
I observe that in Turbo C (v1.5), under MSDOS 3.1, I can set the errorlevel either with exit( errorlevel ); or with return( errorlevel ); Just out of curiousity, are there any [good] stylistic, philosophical, or other reasons for choosing one form over the other? (Such as compatibility?)
ljz@fxgrp.fx.com (Lloyd Zusman) (03/18/88)
In article <4831@sigi.Colorado.EDU> murillo@sigi.Colorado.EDU (Rodrigo Murillo) writes: Does someone out there know how to set the DOS errorlevel number in C? I want to write a batch file that can branch according to the value of this number: if errorlevel 1 echo Big... if errorlevel 2 echo Bigger... if errorlevel 3 echo Biggest. In most (all?) MSDOS C compilers, the exit() function will set errorlevel: main() { ... ... exit(3); } The above will set errorlevel to 3. Using "exit(N)" will set errorlevel to N. -- --- Lloyd Zusman Ma Bell: (415) 961-5183 FX Development Group, Inc. Internet: fxgrp!ljz@ames.arpa Mountain View, California UUCP: ...!ames!fxgrp!ljz
abell@polyslo.UUCP (abell) (03/18/88)
Taking this question one step further, is it possible to get this DOS "error level" into a DBASE III application? Alan
abell@polyslo.UUCP (abell) (03/18/88)
Forgot to include my signature with my question. Just in case, I'll repeat the question: Is it possible to return this DOS "error level" from a C program to a DBASE III application? ------------------------------------------------------------------------------- | Alan Bell | ...!ihnp4!csun!polyslo!abell | | Computer Systems Lab | ...!{csustan,csun,sdsu}!polyslo!abell | | Cal Poly State Univ. | ...!ucbvax!voder!polyslo!abell | | San Luis Obispo, CA 93407 | | -------------------------------------------------------------------------------
jio@cpsc55.ATT.COM (James Odom) (03/29/88)
From article <6985@iuvax.cs.indiana.edu>, by bobmon@iuvax.cs.indiana.edu (RAMontante): > I observe that in Turbo C (v1.5), under MSDOS 3.1, I can set the errorlevel > either with > exit( errorlevel ); > or with > return( errorlevel ); > > Just out of curiousity, are there any [good] stylistic, philosophical, or > other reasons for choosing one form over the other? (Such as compatibility?) Normally, "exit" is used to stop the program and exit to the operating system. "return" is used to report status back to a calling function. If "return" is used in the main function, it is treated the same as "exit" +------------------------------------------------------------------------+ |James I. Odom | |AT&T-IS CPSC Denver, Co Voice: (303) 889-0211 | |ATTMAIL: JODOM Compuserve: 70070,137 uucp: ihnp4!cpsc55!jio | |------------------------------------------------------------------------| |Disclaimer: Any opinions expressed are my own etc. | +------------------------------------------------------------------------+