Re: [Ikvm-developers] Qt Jambi on IKVM

[Jeroen F. <je...@su...>]

Hi Jon,

I have not yet tried it on Linux, if could try and report the result =
that would be very helpful.

Thanks,
Jeroen

> -----Original Message-----
> From: Jon Chambers [mailto:jo...@gm...]=20
> Sent: Thursday, November 09, 2006 14:19
> To: Jeroen Frijters
> Cc: ikv...@li...
> Subject: Re: [Ikvm-developers] Qt Jambi on IKVM
>=20
> Jeroen,
>      I will contact the Qt guys. Did you happen to try on=20
> Linux, as I assume cdecl is the expected calling convention=20
> there and things would work? If not, I can try sometime today.
>=20
> Thanks,
> Jonathan
>=20
>=20
> On 11/9/06, Jeroen Frijters <je...@su...> wrote:
>=20
> 	Hi Jon,
> =09
> 	The name decoration is indeed not required (and ikvm=20
> looks for both the decorated and undecorated names -- this is=20
> actually the reason why ikvm cannot automagically determine=20
> the calling convention, if the decoration was always=20
> consistent, I would be able to dynamically select the proper=20
> calling convention).=20
> =09
> 	Here's an example of the type of errors I get:
> 	C:\j\qt\qtjambi-win-1.0.0-tp3>\ikvm\bin\ikvm -cp=20
> .;qtjambi.jar com.trolltech.demos.TextEdit
> 	QtJambi: Exception pending in native code
> 	java.lang.IllegalArgumentException : Invalid format of=20
> path:   ???=F6
> 	        at=20
> com.trolltech.qt.QClassPathEngine.setFileName(QClassPathFileEn
> gineHandler.java)
> 	        at=20
> com.trolltech.qt.QClassPathEngine.<init>(QClassPathFileEngineH
> andler.java)=20
> 	        at=20
> com.trolltech.qt.QClassPathFileEngineHandler.create(QClassPath
> FileEngineHandler.java)
> 	        at IKVM.Runtime.JNIEnv.InvokeHelper(Unknown Source)
> 	        at=20
> IKVM.Runtime.JNIEnv.CallObjectMethodA(Unknown Source)=20
> 	        at=20
> com.trolltech.qt.gui.QIcon.__qt_QIcon_String(QIcon.java)
> 	        at com.trolltech.qt.gui.QIcon.<init>(QIcon.java)
> 	        at com.trolltech.demos.TextEdit.init(TextEdit.java)
> 	        at com.trolltech.demos.TextEdit.showEvent=20
> (TextEdit.java)
> 	        at IKVM.Runtime.JNIEnv.InvokeHelper(Unknown Source)
> 	        at IKVM.Runtime.JNIEnv.CallVoidMethodA(Unknown Source)
> 	        at com.trolltech.qt.gui.QWidget.__qt_show(QWidget.java)
> 	        at com.trolltech.qt.gui.QWidget.show(QWidget.java)
> 	        at com.trolltech.demos.TextEdit.main(TextEdit.java)
> 	QtJambi: Exception pending in native code
> 	java.lang.IllegalArgumentException: Invalid format of=20
> path:   ???=F6=20
> 	        at=20
> com.trolltech.qt.QClassPathEngine.setFileName(QClassPathFileEn
> gineHandler.java)
> 	        at=20
> com.trolltech.qt.QClassPathEngine.<init>(QClassPathFileEngineH
> andler.java)
> 	        at=20
> com.trolltech.qt.QClassPathFileEngineHandler.create=20
> (QClassPathFileEngineHandler.java)
> 	        at IKVM.Runtime.JNIEnv.InvokeHelper(Unknown Source)
> 	        at IKVM.Runtime.JNIEnv.CallObjectMethodA(Unknown Source)
> 	        at com.trolltech.qt.gui.QIcon.__qt_QIcon_String=20
> (QIcon.java)
> 	        at com.trolltech.qt.gui.QIcon.<init>(QIcon.java)
> 	        at com.trolltech.demos.TextEdit.init(TextEdit.java)
> 	        at com.trolltech.demos.TextEdit.showEvent(TextEdit.java)
> 	        at IKVM.Runtime.JNIEnv.InvokeHelper(Unknown Source)
> 	        at IKVM.Runtime.JNIEnv.CallVoidMethodA(Unknown Source)
> 	        at com.trolltech.qt.gui.QWidget.__qt_show(QWidget.java)
> 	        at com.trolltech.qt.gui.QWidget.show (QWidget.java)
> 	        at com.trolltech.demos.TextEdit.main(TextEdit.java)
> 	*** exception in native code ***
> 	System.NullReferenceException: Object reference not set=20
> to an instance of an object.
> 	   at com.trolltech.qt.gui.QWidget.__qt_show (Int64 )
> 	Exception in thread "main" java.lang.NullPointerException
> 	        at IKVM.Runtime.JNIEnv.InvokeHelper(Unknown Source)
> 	        at IKVM.Runtime.JNIEnv.CallVoidMethodA(Unknown Source)
> 	        at com.trolltech.qt.gui.QWidget.__qt_show(QWidget.java)
> 	        at com.trolltech.qt.gui.QWidget.show(QWidget.java)
> 	        at com.trolltech.demos.TextEdit.main(TextEdit.java)
> =09
> 	I also looked at the disassembly of=20
> com_trolltech_qt_core.dll and unless I'm mistaken it looks=20
> like it doesn't pop the method arguments from the stack (as=20
> is required by __stdcall).=20
> =09
> 	Regards,
> 	Jeroen
> =09
> 	> -----Original Message-----
> 	> From: Jon Chambers [mailto:jo...@gm...]
> 	> Sent: Thursday, November 09, 2006 14:00
> 	> To: Jeroen Frijters=20
> 	> Cc: ikv...@li...
> 	> Subject: Re: [Ikvm-developers] Qt Jambi on IKVM
> 	>
> 	> Hi Jeroen,
> 	>
> 	> First, thanks for the work on ikvm. The fact this is=20
> 	> *possible* is very cool.
> 	>
> 	> A google or two found some hits with questions about stdcall
> 	> vs. cdecl with JNI. From what I gather (if information on
> 	> internet is reliable ;-) ), JNI should be stdcall on windows=20
> 	> *but* alot of links state that the JVM is looking for
> 	> unmangled names anyway. This can be accomplished via a def
> 	> file in VS, or a flag on gcc. So, I'm wondering if the
> 	> undecorated names in com_trolltech_qt_core.dll are still=20
> 	> stdcall. Would undecorated names cause a problem for the IKVM
> 	> JNI layer? If not, any other thoughts? I'm willing to track
> 	> this down myself with some direction. It seems from the
> 	> output that the library was loaded, was the symbol resolved?=20
> 	> I'm trying to find out what the exact error is.
> 	>
> 	> Thnaks Alot,
> 	> Jonathan
> 	>
> 	>
> 	> On 11/9/06, Jeroen Frijters <je...@su...> wrote:=20
> 	>
> 	>       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=20
> the various
> 	>       com_trolltech_qt_*.dlls use the wrong calling=20
> convention for the=20
> 	>       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).=20
> 	>       For some unfortunate reason __cdecl also appears to
> 	> work on the Sun JVM,
> 	>       but unfortunately ikvm cannot magically support both.
> 	>
> 	>       Also see:
> 	>
> 	>=20
> http://weblog.ikvm.net/PermaLink.aspx?guid=3D42da1751-bf3e-44df-
>  <http://weblog.ikvm.net/PermaLink.aspx?guid=3D42da1751-bf3e-44df->=20
> 	> a43a-e198d
> 	>       6a26c06
> 	>
> 	>       Regards,
> 	>       Jeroen
> 	>
> 	>       > -----Original Message-----
> 	>       > From: ikv...@li...
> 	>       > [mailto:=20
> ikv...@li... ] On
> 	>       > Behalf Of Jon Chambers
> 	>       > Sent: Thursday, November 09, 2006 02:50
> 	>       > To: ikv...@li...=20
> 	> <mailto:ikv...@li...>
> 	>       > Subject: [Ikvm-developers] Qt Jambi on IKVM
> 	>       >
> 	>       > Hi everyone,=20
> 	>       >      I am trying out Qt Jambi
> 	>       > (
> 	> http://www.trolltech.com/developer/downloads/qt/qtjambi-techp
> 	> <=20
> http://www.trolltech.com/developer/downloads/qt/qtjambi-techp>
> 	>       > review) on IKVM. These are official Java bindings from
> 	>       > Trolltech that are about to be released; they=20
> are at their=20
> 	>       > final technology preview right now. Anyway, I=20
> wrote a sample
> 	>       > app that works great under ikvm.exe. However,=20
> my goal is
> 	>       > really to use Qt from C#. So, I compiled the=20
> qtjambi.jar file
> 	>       > with ikvmc, and got an assembly. I wrote my=20
> app in C# an
> 	>       > everything built. However, when I run my app I get the
> 	>       > following error (note I got some debug=20
> tracing by adding=20
> 	>       > IKVM.Internal.Tracer.EnableTraceForDebug ()=20
> to the beginning
> 	>       > of my app). I think the JNI method in=20
> question resides in
> 	>       > com_trolltech_qt_core.dll which seems to get=20
> loaded. If this=20
> 	>       > is a problem in qtjambi, I'll like to let=20
> them know before
> 	>       > the final release; it would be very cool if=20
> IKVM could help
> 	>       > get C# bindings from the java ones. But again=20
> my app runs=20
> 	>       > fine on ikvm, so I'm guessing it's something=20
> specific to
> 	>       > ikvmc? Any help/direction would be appreciated.
> 	>       >
> 	>       > Thanks,
> 	>       > Jonathan Chambers=20
> 	>       >
> 	>       > C:\eclipse\QtJambiTest\bin\Debug>QtJambiTest.exe
> 	>       > [20:41:25.20312 ] Core assembly:
> 	>       > C:\eclipse\QtJambiTest\bin\Debug\IKVM.GNU.Class
> 	>       > path.dll
> 	>       > [20:41:25.20312 ] Remapping type System.Exception to
> 	>       > java.lang.Throwable
> 	>       > [20:41:25.20312 ] Remapping type System.IComparable to
> 	>       > java.lang.Comparable=20
> 	>       > [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:
> 	>       > C:\eclipse\QtJambiTest\bin\Debug\QtCore4.dll, cla
> 	>       > ss loader: java.lang.ClassLoader$1@2004EEE
> 	>       > [20:41:25.62500 ] loadLibrary:
> 	>       > C:\eclipse\QtJambiTest\bin\Debug\qtjambi.dll, cla=20
> 	>       > ss loader: java.lang.ClassLoader$1@2004EEE
> 	>       > [20:41:25.62500 ] loadLibrary:
> 	>       > C:\eclipse\QtJambiTest\bin\Debug\QtCore4.dll, cla
> 	>       > ss loader: java.lang.ClassLoader$1@2004EEE=20
> 	>       > [20:41:25.62500 ] loadLibrary:
> 	>       > C:\eclipse\QtJambiTest\bin\Debug\QtGui4.dll, clas
> 	>       > 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:=20
> java.lang.ClassLoader$1@2004EEE
> 	>       > [20:41: 25.64062 ] Linking native method:
> 	>       > com/trolltech/qt/core/QtJambi_LibraryIn=20
> 	>       > itializer.__qt_initLibrary()V, class loader =3D
> 	>       > java.lang.ClassLoader$1@2004EEE, s
> 	>       > hort =3D
> 	>       >
> 	>=20
> Java_com_trolltech_qt_core_QtJambi_1LibraryInitializer__1_1qt_=20
> 	>       > 1initLibrar
> 	>       > y, long =3D
> 	>       >=20
> Java_com_trolltech_qt_core_QtJambi_1LibraryInitializer__1_1qt_
> 	>       > 1initLib
> 	>       > rary__, args =3D 8
> 	>       > [20:41: 25.64062 ] UnsatisfiedLinkError:
> 	>       > com/trolltech/qt/core/QtJambi_LibraryIni
> 	>       > tializer.__qt_initLibrary()V
> 	>       >
> 	>       > Unhandled Exception:=20
> System.TypeInitializationException : The
> 	>       > type initializer fo
> 	>       > r 'com.trolltech.qt.gui.QApplication' threw=20
> an exception.
> 	>       > ---> System.TypeInitia
> 	>       > lizationException: The type initializer for=20
> 	>       > 'com.trolltech.qt.core.QCoreApplicat
> 	>       > ion' threw an exception. --->
> 	>       > System.TypeInitializationException : The type initi
> 	>       > alizer for ' com.trolltech.qt.core.QObject ' threw an
> 	>       > exception. ---> System.TypeI
> 	>       > nitializationException: The type initializer for
> 	>       > 'com.trolltech.qt.QtObject' thr
> 	>       > ew an exception. --->=20
> System.TypeInitializationException :
> 	>       > The type initializer f
> 	>       > or=20
> 'com.trolltech.qt.QtJambi_LibraryInitializer' threw an
> 	>       > exception. ---> System
> 	>       > .TypeInitializationException: The type=20
> initializer for=20
> 	>       > 'com.trolltech.qt.QClassP
> 	>       > athFileEngineHandler' threw an exception. --->
> 	>       > System.TypeInitializationExceptio
> 	>       > n: The type initializer for
> 	>       > ' com.trolltech.qt.core.QAbstractFileEngineHandler' t
> 	>       > hrew an exception. --->=20
> System.TypeInitializationException:
> 	>       > The type initializer
> 	>       >  for=20
> 'com.trolltech.qt.core.QtJambi_LibraryInitializer '
> 	>       > threw an exception. --->
> 	>       >  java.lang.UnsatisfiedLinkError:
> 	>       > com/trolltech/qt/core/QtJambi_LibraryInitialize
> 	>       > r.__qt_initLibrary()V
> 	>       >    --- End of inner exception stack trace ---=20
> 	>       >    at=20
> com.trolltech.qt.core.QtJambi_LibraryInitializer.init ()
> 	>       >    at
> 	> com.trolltech.qt.core.QAbstractFileEngineHandler..cctor ()
> 	>       >    --- End of inner exception stack trace ---=20
> 	>       >    at
> 	> com.trolltech.qt.core.QAbstractFileEngineHandler.__<clinit>()
> 	>       >    at=20
> com.trolltech.qt.QClassPathFileEngineHandler..cctor ()
> 	>       >    --- End of inner exception stack trace ---=20
> 	>       >    at
> 	> com.trolltech.qt.QClassPathFileEngineHandler.__<clinit>()
> 	>       >    at=20
> com.trolltech.qt.QtJambi_LibraryInitializer..cctor()
> 	>       >    --- End of inner exception stack trace ---=20
> 	>       >    at=20
> 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=20
> 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
> 	>       > C:\eclipse\QtJambiTest\Program.
> 	>       > cs:line 13
> 	>       >
> 	>       >
> 	>
> 	>
> 	>
> 	>
> =09
>=20
>=20
>=20