Re: Updates to JPL

On Fri, 2 Jun 2000 [email protected] wrote:

> 
> Brain:
> 
> I took your suggestion and forwarded our earlier conversations to the JPL
> list and have cc: them on this one.  To address your questions, a) I did
> add the D:\jdk1.2.2\jre\bin\classic to my %PATH% variable and all is well;
> b) the MSVCRT.LIB should be in your %LIBRARY% path -- it's a default MS
> thing.  I was wondering if perhaps it was missing from your directory. I
> think MSVCRT is the lib with the basic functions and symbols you were
> missing in your link.

Thanks - I have it in my %LIB% and %LIBRARY% path, which is:

LIBRARY=e:\Program Files\Microsoft Visual Studio\VC98\mfc\lib;e:\Program
Files\Microsoft Visual Studio\VC98\lib;C:\Program Files\Microsoft Visual
Studio\VC98\lib

However, I get these error messages when I run "perl Makefile.PL"  in the
JNI directory: 

Note (probably harmless): No library found for '-l'
Note (probably harmless): No library found for 'oldnames.lib'
Note (probably harmless): No library found for 'kernel32.lib'
Note (probably harmless): No library found for 'user32.lib'
Note (probably harmless): No library found for 'gdi32.lib'
Note (probably harmless): No library found for 'winspool.lib'
Note (probably harmless): No library found for 'comdlg32.lib'
Note (probably harmless): No library found for 'advapi32.lib'
Note (probably harmless): No library found for 'shell32.lib'
Note (probably harmless): No library found for 'ole32.lib'
Note (probably harmless): No library found for 'oleaut32.lib'
Note (probably harmless): No library found for 'netapi32.lib'
Note (probably harmless): No library found for 'uuid.lib'
Note (probably harmless): No library found for 'wsock32.lib'
Note (probably harmless): No library found for 'mpr.lib'
Note (probably harmless): No library found for 'winmm.lib'
Note (probably harmless): No library found for 'version.lib'
Note (probably harmless): No library found for 'odbc32.lib'
Note (probably harmless): No library found for 'odbccp32.lib'
Note (probably harmless): No library found for 'msvcrt.lib'
Writing Makefile for JNI

Since it says "probably harmless" I figured I could ignore it. Maybe not?
Could the spaces in the path name be confusing Makefile.PL?

[...]
> I also added "if $JPL::DEBUG" to all of the print statements to turn off
> all of the debug output.  Is there a way to turn jpldebug in JNI.XS OFF
> or ON programmatically? 

I'm not sure about that - are you looking for a #define or an environment
variable? 

[...]
> Are there (i.e., to you have or know the location of) any extensive
> examples of using this module?  Particularly, JNI.

Aside from the stuff in the Perl Resource Kit, I'm not aware of any
extensive examples.  There is a chapter online at:

  http://www.oreilly.com/catalog/prkunix/excerpt/UGch03.html

Many of these examples show Perl calling into Java from within a .jpl
file, and in a lot of cases, the Java code is just scaffolding because we
had problems embedding Java in Perl with initial versions.

I think you can just use the Perl stuff in some cases - for example,
consider ObjectExample.jpl (which can be found in that online chapter). I
just copied out this Perl code and ran it on Redhat 6.1: 

    # Import the class definition.
    #
    use JPL::Class 'java::awt::Frame';

    # Create a new instance of the Frame.
    #
    my $f = new java::awt::Frame;

    # What does Perl think of this Frame?
    #
    print "    Got a ", ref $f, "\n";

This produced some interesting debugging output, but I finally got:

    Got a java::awt::Frame

--
Brian Jepson * ([email protected])  *  http://www.jepstone.net/