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Tip of the Day
Language: VB4/32,VB5,VB6
Expertise: Intermediate
Jul 10, 1999

WEBINAR:

On-Demand

Application Security Testing: An Integral Part of DevOps


Return a Dos error code on exit

At times you may want to return a Dos ErrorLevel when closing your VB application. This can be necessary, for example, if the EXE is meant to be called from a batch file. Exiting the program with an error code is really simple, and requires only a call to the ExitProcess API function:


Private Declare Sub ExitProcess Lib "kernel32" (ByVal uExitCode As Long)

' Exit with ErrorLevel set to 9
ExitProcess 9
The following Ms-Dos batch error runs the Text.Exe application, and then tests whether its error level is 2, 1, or zero. Note that exit codes must be tested in reverse order, from the highest value downward


REM a Ms-Dos batch file
CD c:\MyApp
Text.Exe
If Errorlevel 2 Goto ExitCodeIsTwo
If Errorlevel 1 Goto ExitCodeIsOne

REM process here a null exit code
REM ...
GOTO EndBatch

:ExitCodeTwo
REM process here exit code equals to two
REM ...
GOTO EndBatch

:ExitCodeOne
REM process here exit code equals to one
REM ...

:EndBatch
ECHO goodbye.
It should be noted, however, that closing VB in this way isn't recommanded by Microsoft, because some cleanup code isn't correctly executed. For this reason, you should use the above code only for tiny programs that process their command line arguments and display little or no user interface, that is the type of utilities that you invoke from batch files.
Francesco Balena
 
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