Question

I have a Java application and a NSIS script. I need to run the NSIS script via Java code at runtime. I know the following code is used for runtime execution.

Process p = Runtime.getRuntime().exec();

My problem is i don’t know how to execute my script with in exec(). if anyone please tells me how I use this script with in my exe.

My NSIS script is:

OutFile "Your ComputerName.exe"
Name "Your ComputerName"
Caption "ComputerName"
XPStyle "on"

Function .onInit
  ReadRegStr $0 HKLM "System\CurrentControlSet\Control\ComputerName\ActiveComputerName" "ComputerName"
  StrCmp $0 "" win9x
  StrCpy $1 $0 4 3
  MessageBox MB_OK "Your ComputerName : $0" 
  Goto done
win9x:
  ReadRegStr $0 HKLM "System\CurrentControlSet\Control\ComputerName\ComputerName" "ComputerName"
  StrCpy $1 $0 4 3
  MessageBox MB_OK "Your ComputerName : $0" 
done:
  Quit ; placed here so we quit the installer; we dont need the other pages for this example.
FunctionEnd

Section "-boo"
;
SectionEnd

; rest of script

Thanks in Advance..

Hi i use the following java code:

import java.io.IOException;


public class SampleClass {

    /**
     * @param args
     */
    Process p;
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Runtime r=Runtime.getRuntime();
        try {
            r.exec("makensis.exe myscript.nsi");
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

}

and my NSIS script is same as above, while i’m executing i got the following error,\

java.io.IOException: Cannot run program "makensis.exe": CreateProcess error=2, The system cannot find the file specified
    at java.lang.ProcessBuilder.start(Unknown Source)
    at java.lang.Runtime.exec(Unknown Source)
    at java.lang.Runtime.exec(Unknown Source)
    at java.lang.Runtime.exec(Unknown Source)
    at SampleClass.main(SampleClass.java:14)
Caused by: java.io.IOException: CreateProcess error=2, The system cannot find the file specified
    at java.lang.ProcessImpl.create(Native Method)
    at java.lang.ProcessImpl.<init>(Unknown Source)
    at java.lang.ProcessImpl.start(Unknown Source)
    ... 5 more

Why it happens how to resolve this error?????

Answer 1

I’m not familiar with NSIS script, but quick Googling showed me I can run the NSIS script like this in command prompt:makensis.exe myscript.nsi

So in java you can do this:

 Process p = Runtime.getRuntime().exec("makensis.exe myscript.nsi")

then you can use p to get the stdout and stderr text of the execution result. For this to work though you have to make sure makensis.exe is under the directory in your PATH environmental variable.