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Re: [platform-swt-dev] Adding functions to OS.JAVA
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----- Original Message -----
> From: "Leo Ufimtsev" <lufimtse@xxxxxxxxxx>
> To: platform-swt-dev@xxxxxxxxxxx
> Sent: Tuesday, September 16, 2014 11:13:12 PM
> Subject: [platform-swt-dev] Adding functions to OS.JAVA
>
> Hello,
>
> I'm new to swt development. I'm having issues with adding a new gtk
> wrapper to OS.java and was hoping someone could help?
>
> @Fedora 20, gtk3.10
>
> As part of the button-size issue (394534), I need to add an extra
> wrapper to OS.java.
> I followed instructions:
> https://www.eclipse.org/swt/jnigen.php
>
> However, I'm running into UnsatisfiedLinkError.
>
> My steps:
>
> 1) Added the following to OS.java
> /** @method flags=dynamic */
> public static final native void _gtk_widget_set_margin_right(long
> /*int*/ widget, int margin); //LINFO Margin ++ func.
> public static final void gtk_widget_set_margin_right(long /*int*/
> widget, int margin) {
> lock.lock();
> try {
> _gtk_widget_set_margin_right(widget,margin);
> } finally {
> lock.unlock();
> }
> }
>
> //Note, gtk_widget_set_margin_right is deprecated as of gtk3.12. But
> since I'm using gtk3.10, for the time being I thought I'd use this guy
> first.
That's really bad idea. When things get deprecated, they are deprecated for a reason and fixes for these functions usually stop at the time of deprecation.
Please look for another function to use/way to do it. One way of doing it is to add gtk_widget_set_margin_end binding too and use it for GTK 3.12 or newer.
>
> 2) Cleaned all projects
> 3) ran build.xml from org.eclipse.swt.gtk.linux.x86_64/build.xml
> - the following were selected:
> build.jars
> build_libraries
>
> Build fails with:
> /home/lufimtse/git/eclipse.platform.swt/bundles/org.eclipse.swt/buildSWT.xml:928:
> The following error occurred while executing this line:
> /home/lufimtse/git/eclipse.platform.swt/bundles/org.eclipse.swt/buildSWT.xml:900:
> javax.script.ScriptException: ReferenceError: "importClass" is not
> defined in <eval> at line number 3
This step should not be needed.
>
> 4) Open terminal. Export vars:
> export JAVA_HOME=/usr/lib/jvm/java/
> export GTK_VERSION=3.0
This means that you would recompile only gtk3 native wrapper. If you use the function in gtk2 code paths you need to recompile (export GTK_VERSION=2.0) and copy it's so file too. As the function you try to use is added in GTK 3.0 on GTK2.x you would get the error you mention. Please provide patches(in gerrit ideally - marked as [WIP] in the subject) in such cases as seeing the code makes it way easier to spot a problem than guessing.
Alexander Kurtakov
Red Hat Eclipse team
>
> 5) Re-build wrappers.
> cd ~/git/eclipse.platform.swt/bundles/org.eclipse.swt/bin/library/
> sh ./build.sh
>
> 6) Copy new .so's across:
> cp -v
> ~/git/eclipse.platform.swt/bundles/org.eclipse.swt/bin/library/*.so
> ~/git/eclipse.platform.swt.binaries/bundles/org.eclipse.swt.gtk.linux.x86_64/
>
> When I attempt to run my program that calls the native function, I get
> an unsatisfied link exception:
> Exception in thread "main" java.lang.UnsatisfiedLinkError:
> org.eclipse.swt.internal.gtk.OS._gtk_widget_set_margin_right(JI)V
> at org.eclipse.swt.internal.gtk.OS._gtk_widget_set_margin_right(Native
> Method)
> at
> org.eclipse.swt.internal.gtk.OS.gtk_widget_set_margin_right(OS.java:14565)
> at org.eclipse.swt.widgets.DateTime.createText(DateTime.java:139)
> at org.eclipse.swt.widgets.DateTime.<init>(DateTime.java:122)
> at
> org.eclipse.swt.examples.controlexample.DateTimeTab.createExampleWidgets(DateTimeTab.java:65)
> at
> org.eclipse.swt.examples.controlexample.Tab.createTabFolderPage(Tab.java:1307)
> at
> org.eclipse.swt.examples.controlexample.ControlExample.<init>(ControlExample.java:60)
> at
> org.eclipse.swt.examples.controlexample.ControlExample.main(ControlExample.java:217)
>
>
> Thoughts?
>
> Thank you
>
> Leo Ufimtsev | Red Hat
>
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