What would be the best way to get the location of java.home in my C++ app? Right now I'm getting it from the registry but am wondering if there's a better/easier/cleaner way.
Thanks, Serge
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The registry is probably your best bet on Windows. Out of curiosity, why do you need the location of the Java home directory? – Tom Jul 02 '10 at 17:28
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@Tom: It's not that easy to explain but I'll try. I have this AIR 2 app that launches a JAR file. In order to launch that file, I need java.exe and since that can be installed in various locations I want to check where it is first. – sjespers Jul 02 '10 at 17:36
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As far as I know, the Registry is the only other way... other than JAVA_HOME that is. – Powerlord Jul 02 '10 at 18:03
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if JAVA_HOME is set to the java home directory. If not val will be null.
char* val = getenv("JAVA_HOME");
Robby Pond
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Setting the JAVA_HOME environment variable doesn't seem to be part of the default Java installation process and thus it won't exist in many cases. – sjespers Jul 02 '10 at 17:37
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That's wrong. JAVA_HOME and java.home are very different beasts. See the code for the JVM. – ingyhere May 14 '13 at 03:57
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If you're on a Unix/Linux box, perhaps you could do "which java". If you need assistance doing this in C++, see How to execute a command and get output of command within C++ using POSIX?
If you're on a Windows box, there is a "which.bat" someone made that I've used with success in the past, although it's not as good. You'd have to google for it.
Hopefully this can point you in the right direction!
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There is often a copy of javaw in the System32 directory of a Windows installation, so getenv("windir"), and concatenate "\System32\javaw.exe".
The second choice is then to open a File Browser dialog to choose the location of javaw.exe.
maxwellb
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