Which JRE Architecture is install (32-bit or 64 bit)

heinkoi459September 16, 2011 at 5:54 PM#

Which JRE Architecture is install (32-bit or 64 bit)

Hi, how can I determine the JRE build architecture (32bit / 64bit) in my NSIS installation???

Thank you!!!

jakcSeptember 17, 2011 at 9:51 PM#

I cannot help, but assume your question is the very same one I have?
- I need to determine if the host machine that the installer being run on, has either a 32 or 64 bit JRE.

LoRd_MuldeRSeptember 17, 2011 at 10:10 PM#

First of all you have the problem that several JRE's might be installed.

Check this reg key:
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\JavaSoft\Java Runtime Environment

It has a sub-key for each JRE installed. And in each sub-folder there is "JavaHome", which gives you the individual install folder of the JRE.

You can then simply check the bitness of "%JavaHome%\bin\java.exe", I guess 😉

Look at GetBinaryType() for details:

GetBinaryTypeA function (winbase.h) - Win32 apps

http://msdn.microsoft.com/en-us/library/aa364819%28VS.85%29.aspx

Determines whether a file is an executable (.exe) file, and if so, which subsystem runs the executable file. (ANSI)

How you call that function from NSIS (e.g. via System plug-in) is another topic. Also note that it needs Windows XP or later...

heinkoi459September 19, 2011 at 11:03 AM#

Hum, can I get a little hint for How to call GetBinaryType. I did some researchs but nothing really interesting.

Thank you

LoRd_MuldeRSeptember 19, 2011 at 12:49 PM#

Originally Posted by heinkoi459 View Post

Hum, can I get a little hint for How to call GetBinaryType. I did some researchs but nothing really interesting.

Thank you

What do you need to know?

I think the MSDN documentation that I pointed to explains the function in detail. Now you just need to call it via NSIS' System plug-in or create a simple plug-in wrapper around the function...

(Docs for the System plug-in are available. The same goes for the NSIS plug-in SDK)