I recently needed to create an application to edit text files generated by various other systems. The application can run with a GUI and in batch mode. When run in batch mode the application needed to send an 'ErrorLevel' code to the command processor. The ErrorLevel code was then used to 'OK' the results of the batch execution.
I had never written an 'exit code' routine so I posed a question in one of the news groups. I got help from various people, including Bob O'Brien. To test the process I wrote a demo program. I cleaned-up the program and decided to make it the tip of the month. I also used a routine which I call 'IsExecutingFromIDE' in this application.
I wrote a VB 6 program to demonstrate the code. A screen shot of the demo:
The program can be run in GUI or batch mode. A screen shot of the program executing in batch:
In this example exit code 5 was returned.
The Batch File
echo 2001/05/01 Demonstrate sending an exit Code from a VB application.
echo 2001/05/01 Copyright 2001, Larry Rebich, email@example.com.
rem errorlevel codes must be tested in reverse order.
if errorlevel 9 goto Err9
if errorlevel 8 goto Err8
if errorlevel 7 goto Err7
if errorlevel 6 goto Err6
if errorlevel 5 goto Err5
if errorlevel 4 goto Err4
if errorlevel 3 goto Err3
if errorlevel 2 goto Err2
if errorlevel 1 goto Err1
echo ErrorLevel = 0 Returned, Do exit Code 0 Items.
echo ErrorLevel = 1 Returned, Do exit Code 1 Items.
echo ErrorLevel = 2 Returned, Do exit Code 2 Items.
echo ErrorLevel = 3 Returned, Do exit Code 3 Items.
echo ErrorLevel = 4 Returned, Do exit Code 4 Items.
echo ErrorLevel = 5 Returned, Do exit Code 5 Items.
echo ErrorLevel = 6 Returned, Do exit Code 6 Items.
echo ErrorLevel = 7 Returned, Do exit Code 7 Items.
echo ErrorLevel = 8 Returned, Do exit Code 8 Items.
echo ErrorLevel = 9 Returned, Do exit Code 9 Items.
echo End of batch file.
pause Press any key to continue.
Can't Run If UNC
I found that the batch file can't be run from a folder pointed to by a UNC. I got the following error messages:
Include in Your Application
Calling ReturnExitCode causes an immediate end to your application. It is a destructive termination. You should close all files and do any other application 'clean-up' before calling ReturnExitCode. If you call ReturnExitCode while running from the VB IDE the system will 'crash'.
The Demo Program Uses modConnectToWebSite
The demo program uses modConnectToWebSite.bas to display this page. For details on the use of that module click here.
Download VB 6 Source Code
Click here to download the VB 6 source code [16k]
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