#10 – The Return Value from Main() Sets ERRORLEVEL Variable in Windows
June 27, 2010 9 Comments
If your Main() function returns an integer value, you can check that value in the calling program or script using the ERRORLEVEL environment variable. By convention, a return value of 0 indicates success and any other value indicates an error. Below is a sample .bat file that calls a program called MyProgram and then checks the return value.
@echo off MyProgram IF "%ERRORLEVEL%" == "0" goto OK :NotGood echo Bad news. Program returned %ERRORLEVEL% goto End :OK echo Everything A-OK :End