Java Launcher: Difference between revisions
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[[Category:Java]] |
Revision as of 03:51, 29 April 2008
Author: Baz (talk, contrib) |
Description
Here is a NSIS script which can be used to launch Java programs the easy way.
It will search for the JRE the following way:
1 - in jre directory (if you have JRE Installed with your application) 2 - in JAVA_HOME environment variable 3 - in the registry 4 - assume java.exe in current dir or PATH
In this example NSIS is not used as an installer but as a windows program.
There's no programming language out there in which it can be done this simple!
Have fun! (can you believe people want you to pay for this!)
The Script
; Java Launcher ;-------------- Name "Java Launcher" Caption "Java Launcher" Icon "Java Launcher.ico" OutFile "Java Launcher.exe" SilentInstall silent AutoCloseWindow true ShowInstDetails nevershow !define CLASSPATH ".;lib;lib\myJar" !define CLASS "org.me.myProgram" Section "" Call GetJRE Pop $R0 ; change for your purpose (-jar etc.) StrCpy $0 '"$R0" -classpath "${CLASSPATH}" ${CLASS}' SetOutPath $EXEDIR Exec $0 SectionEnd Function GetJRE ; ; returns the full path of a valid java.exe ; looks in: ; 1 - .\jre directory (JRE Installed with application) ; 2 - JAVA_HOME environment variable ; 3 - the registry ; 4 - hopes it is in current dir or PATH Push $R0 Push $R1 ; use javaw.exe to avoid dosbox. ; use java.exe to keep stdout/stderr !define JAVAEXE "javaw.exe" ClearErrors StrCpy $R0 "$EXEDIR\jre\bin\${JAVAEXE}" IfFileExists $R0 JreFound ;; 1) found it locally StrCpy $R0 "" ClearErrors ReadEnvStr $R0 "JAVA_HOME" StrCpy $R0 "$R0\bin\${JAVAEXE}" IfErrors 0 JreFound ;; 2) found it in JAVA_HOME ClearErrors ReadRegStr $R1 HKLM "SOFTWARE\JavaSoft\Java Runtime Environment" "CurrentVersion" ReadRegStr $R0 HKLM "SOFTWARE\JavaSoft\Java Runtime Environment\$R1" "JavaHome" StrCpy $R0 "$R0\bin\${JAVAEXE}" IfErrors 0 JreFound ;; 3) found it in the registry StrCpy $R0 "${JAVAEXE}" ;; 4) wishing you good luck JreFound: Pop $R1 Exch $R0 FunctionEnd
once you get this working, do check out A slightly better Java Launcher and Java Launcher with automatic JRE installation.