trizzi_it
1st October 2004 09:33 UTC

ReadRegStr in loop
hi all,
my question is simple. is it possible (and how) reading the registry in a loop...

The needed is simple. Suppose that you want to see all the jdk installed in a system.

Normally windows use this registry entry:
HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Development Kit

and under this key it put several key entries, depending from what you have installed:

HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Development Kit\1.4
HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Development
Kit\1.4.2_04
HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Development Kit\1.4.2_05

so suppose that my application doesn't suppor jdk minor version 04 and support only 05 or highter. I'd like to let the user download the right jdk only if it's not istalled (see present) in the system.
If someone istall 05 and after 04 the current version points to 04 but 05 is installed in the system, in this case i'd like to prevent a jdk download and point my class path and whatever where the right jdk is installed.

thanks a lot

Afrow UK
1st October 2004 10:28 UTC

You can use this macro to check if a key exists:
http://nsis.sourceforge.net/archive/...b.php?page=364

-Stu

kichik
1st October 2004 11:03 UTC

You can also use EnumRegKey, EnumRegValue and some integer comparisons for a more general solution.

trizzi_it
5th October 2004 07:29 UTC

thanks a lot.
I used the second solution + a script for version cheking (well i was able to add a couple of features for java).