Re: [Ikvm-developers] Qt Jambi on IKVM

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Hi Jon,

I can't get *any* of the examples/demos included in the preview to work
on ikvm. From the looks of it, I'd guess that the various
com_trolltech_qt_*.dlls use the wrong calling convention for the
exported JNI methods.

On Windows, JNI methods need to use the __stdcall calling convention
(usually this is done automatically by the JNICALL #define in jni_md.h).
For some unfortunate reason __cdecl also appears to work on the Sun JVM,
but unfortunately ikvm cannot magically support both.

Also see:
http://weblog.ikvm.net/PermaLink.aspx?guid=3D42da1751-bf3e-44df-a43a-e198=
d
6a26c06

Regards,
Jeroen

> -----Original Message-----
> From: ikv...@li...=20
> [mailto:ikv...@li...] On=20
> Behalf Of Jon Chambers
> Sent: Thursday, November 09, 2006 02:50
> To: ikv...@li...
> Subject: [Ikvm-developers] Qt Jambi on IKVM
>=20
> Hi everyone,
>      I am trying out Qt Jambi=20
> (http://www.trolltech.com/developer/downloads/qt/qtjambi-techp
> review) on IKVM. These are official Java bindings from=20
> Trolltech that are about to be released; they are at their=20
> final technology preview right now. Anyway, I wrote a sample=20
> app that works great under ikvm.exe. However, my goal is=20
> really to use Qt from C#. So, I compiled the qtjambi.jar file=20
> with ikvmc, and got an assembly. I wrote my app in C# an=20
> everything built. However, when I run my app I get the=20
> following error (note I got some debug tracing by adding=20
> IKVM.Internal.Tracer.EnableTraceForDebug () to the beginning=20
> of my app). I think the JNI method in question resides in=20
> com_trolltech_qt_core.dll which seems to get loaded. If this=20
> is a problem in qtjambi, I'll like to let them know before=20
> the final release; it would be very cool if IKVM could help=20
> get C# bindings from the java ones. But again my app runs=20
> fine on ikvm, so I'm guessing it's something specific to=20
> ikvmc? Any help/direction would be appreciated.=20
>=20
> Thanks,
> Jonathan Chambers
>=20
> C:\eclipse\QtJambiTest\bin\Debug>QtJambiTest.exe
> [20:41:25.20312 ] Core assembly:=20
> C:\eclipse\QtJambiTest\bin\Debug\IKVM.GNU.Class
> path.dll
> [20:41:25.20312 ] Remapping type System.Exception to=20
> java.lang.Throwable
> [20:41:25.20312 ] Remapping type System.IComparable to=20
> java.lang.Comparable
> [20:41:25.20312 ] Remapping type System.Object to java.lang.Object
> [20:41:25.20312 ] Remapping type System.String to java.lang.String
> [20:41:25.62500 ] loadLibrary:=20
> C:\eclipse\QtJambiTest\bin\Debug\QtCore4.dll, cla
> ss loader: java.lang.ClassLoader$1@2004EEE
> [20:41:25.62500 ] loadLibrary:=20
> C:\eclipse\QtJambiTest\bin\Debug\qtjambi.dll, cla=20
> ss loader: java.lang.ClassLoader$1@2004EEE
> [20:41:25.62500 ] loadLibrary:=20
> C:\eclipse\QtJambiTest\bin\Debug\QtCore4.dll, cla
> ss loader: java.lang.ClassLoader$1@2004EEE
> [20:41:25.62500 ] loadLibrary:=20
> C:\eclipse\QtJambiTest\bin\Debug\QtGui4.dll, clas=20
> s loader: java.lang.ClassLoader$1@2004EEE
> [20:41:25.62500 ] loadLibrary:=20
> C:\eclipse\QtJambiTest\bin\Debug\com_trolltech_qt
> _core.dll, class loader: java.lang.ClassLoader$1@2004EEE
> [20:41:25.64062 ] Linking native method:=20
> com/trolltech/qt/core/QtJambi_LibraryIn=20
> itializer.__qt_initLibrary()V, class loader =3D=20
> java.lang.ClassLoader$1@2004EEE, s
> hort =3D=20
> Java_com_trolltech_qt_core_QtJambi_1LibraryInitializer__1_1qt_
> 1initLibrar
> y, long =3D=20
> Java_com_trolltech_qt_core_QtJambi_1LibraryInitializer__1_1qt_
> 1initLib=20
> rary__, args =3D 8
> [20:41:25.64062 ] UnsatisfiedLinkError:=20
> com/trolltech/qt/core/QtJambi_LibraryIni
> tializer.__qt_initLibrary()V
>=20
> Unhandled Exception: System.TypeInitializationException: The=20
> type initializer fo=20
> r 'com.trolltech.qt.gui.QApplication' threw an exception.=20
> ---> System.TypeInitia
> lizationException: The type initializer for=20
> 'com.trolltech.qt.core.QCoreApplicat
> ion' threw an exception. --->=20
> System.TypeInitializationException : The type initi
> alizer for 'com.trolltech.qt.core.QObject' threw an=20
> exception. ---> System.TypeI
> nitializationException: The type initializer for=20
> 'com.trolltech.qt.QtObject' thr
> ew an exception. ---> System.TypeInitializationException :=20
> The type initializer f
> or 'com.trolltech.qt.QtJambi_LibraryInitializer' threw an=20
> exception. ---> System
> .TypeInitializationException: The type initializer for=20
> 'com.trolltech.qt.QClassP
> athFileEngineHandler' threw an exception. --->=20
> System.TypeInitializationExceptio
> n: The type initializer for=20
> 'com.trolltech.qt.core.QAbstractFileEngineHandler' t
> hrew an exception. ---> System.TypeInitializationException:=20
> The type initializer
>  for 'com.trolltech.qt.core.QtJambi_LibraryInitializer '=20
> threw an exception. --->
>  java.lang.UnsatisfiedLinkError:=20
> com/trolltech/qt/core/QtJambi_LibraryInitialize
> r.__qt_initLibrary()V
>    --- End of inner exception stack trace ---
>    at com.trolltech.qt.core.QtJambi_LibraryInitializer.init ()
>    at com.trolltech.qt.core.QAbstractFileEngineHandler..cctor()
>    --- End of inner exception stack trace ---
>    at com.trolltech.qt.core.QAbstractFileEngineHandler.__<clinit>()
>    at com.trolltech.qt.QClassPathFileEngineHandler..cctor ()
>    --- End of inner exception stack trace ---
>    at com.trolltech.qt.QClassPathFileEngineHandler.__<clinit>()
>    at com.trolltech.qt.QtJambi_LibraryInitializer..cctor()
>    --- End of inner exception stack trace ---=20
>    at com.trolltech.qt.QtJambi_LibraryInitializer.init()
>    at com.trolltech.qt.QtObject..cctor()
>    --- End of inner exception stack trace ---
>    at com.trolltech.qt.QtObject.__<clinit>()
>    at com.trolltech.qt.core.QObject..cctor ()
>    --- End of inner exception stack trace ---
>    at com.trolltech.qt.core.QObject.__<clinit>()
>    at com.trolltech.qt.core.QCoreApplication..cctor()
>    --- End of inner exception stack trace ---
>    at com.trolltech.qt.core.QCoreApplication.__<clinit>()
>    at com.trolltech.qt.gui.QApplication..cctor()
>    --- End of inner exception stack trace ---
>    at com.trolltech.qt.gui.QApplication..ctor(String[] strarr)=20
>    at QtJambiTest.Program.Main(String[] args) in=20
> C:\eclipse\QtJambiTest\Program.
> cs:line 13
>=20
>=20