Simple Java Runtime Download Script

Author: mooxie (talk, contrib)

Description

This is a simple code snippet for downloading a JRE.

The Snippet

This at the top:

!define JRE_VERSION "1.5"
!define JRE_URL "http://dlc.sun.com/jdk/jre-1_5_0_01-windows-i586-p.exe"

In your MainSection:

Call DetectJRE

And this wherever you want:

Function GetJRE
        MessageBox MB_OK "${PRODUCT_NAME} uses Java 1.5, it will now \
                         be downloaded and installed"
 
        StrCpy $2 "$TEMP\Java Runtime Environment.exe"
        nsisdl::download /TIMEOUT=30000 ${JRE_URL} $2
        Pop $R0 ;Get the return value
                StrCmp $R0 "success" +3
                MessageBox MB_OK "Download failed: $R0"
                Quit
        ExecWait $2
        Delete $2
FunctionEnd
 
 
Function DetectJRE
  ReadRegStr $2 HKLM "SOFTWARE\JavaSoft\Java Runtime Environment" \
             "CurrentVersion"
  StrCmp $2 ${JRE_VERSION} done
 
  Call GetJRE
 
  done:
FunctionEnd