Use IF command from batch script with java

Question

How do I use the IF command to respond on the output of the first java relay status command.

When you run the command the output is 0 when relay 1 is off. example below.

java -jar "C:\4_USB_Relay\DenkoviRelayCommandLineTool_10.jar" DAE001DQ 4 1 status

0

---

*REM Check_relay_status_output*

java -jar "C:\4_USB_Relay\DenkoviRelayCommandLineTool_10.jar" DAE001DQ 4 1 status

*REM Turn_relay_on*    
java -jar "C:\4_USB_Relay\DenkoviRelayCommandLineTool_10.jar" DAE001DQ 4 1 1

*REM Turn_relay_off*    
java -jar "C:\4_USB_Relay\DenkoviRelayCommandLineTool_10.jar" DAE001DQ 4 1 0

---

My idea is to use the one batch script to turn a relay on when its off and off when its on. :)

I'm not sure how to do this as its using a java command and I'm not sure how to capture the output.

All help would be greatly appreciated. :)

Answer 1

does this set errorlevel or the result is just printed? You can use FIND command and conditional execution :

java -jar "C:\4_USB_Relay\DenkoviRelayCommandLineTool_10.jar" DAE001DQ 4 1 status 2>&1 | find "0" && (
 java -jar "C:\4_USB_Relay\DenkoviRelayCommandLineTool_10.jar" DAE001DQ 4 1 1
) || (
  java -jar "C:\4_USB_Relay\DenkoviRelayCommandLineTool_10.jar" DAE001DQ 4 1 0
)

Answer 2

You can use System.exit(int) in your Java process to set a return code for the batch script. Then, in your batch script you can get the return code as ERRORLEVEL like

echo %ERRORLEVEL%

And an if might look like

IF %ERRORLEVEL% EQU 0 echo Zero
IF %ERRORLEVEL% EQU 1 echo One