@echo off
program.exe

if errorlevel 3 goto ERROR
if errorlevel 1 goto WARNING

rem 0 <= errorlevel < 1
echo Success
goto END

:WARNING
rem 1 <= errorlevel < 3
echo Warning
goto END

:ERROR
rem 3 <= errorlevel
echo Error

:END

##</code><code>##

DWORD status;
...
GetExitCodeProcess(ProcessInformation.hProcess, &status);
ret = (int)status;