Re: [Ikvm-developers] Using SWT [new problems]

[John L. <joh...@gm...>]

Hello,

Just in case you weren't aware of it, there is a port of SWT to C#
that can at least run small examples ok.  I dont think anyone is
maintaining it though, so if your goal is to keep up with new versions
of SWT it might not be a good alternative.

http://sharpwt.net

On Tue, 31 Aug 2004 16:34:53 -0400, David Jung <ju...@or...> wrote:
> Thanks for all the work on JNI!  I've tried the latest snapshot.  It
> gets me further running SWT, but there
> are still some bugs...
> 
> Now some of my sample snippets work on SWT 2.1.3, but other don't - for
> different reasons.
> None of my SWT 3.1M1 snippets work.
> 
> Here are some trace-backs - hope they're useful...
> 
> Firstly, the good news is that my HelloWorld snippet that just creates a
> Display & Shell works under
> SWT2.1.3 and opens an empty window (as expected).
> Under SWT3.1M1 I get this error:
> [jungd@marvin swt-3.1M1]$ mono HelloWorldSWT.exe
> 
> (<unknown>:11043): GLib-GObject-WARNING **: type name `' is too short
> 
> (<unknown>:11043): GLib-GObject-CRITICAL **: file gobject.c: line 819
> (g_object_new): assertion `G_TYPE_IS_OBJECT (object_type)' failed
> 
> Unhandled Exception: org.eclipse.swt.SWTError: No more handles
> in <0x0051d> org.eclipse.swt.SWT:error (int,System.Exception,string)
> in <0x00012> org.eclipse.swt.SWT:error (int,System.Exception)
> in <0x0000f> org.eclipse.swt.SWT:error (int)
> in <0x0000a> org.eclipse.swt.widgets.Widget:error (int)
> in <0x0007e> org.eclipse.swt.widgets.Composite:createHandle (int,bool)
> in <0x0019d> org.eclipse.swt.widgets.Shell:createHandle (int)
> in <0x00011> org.eclipse.swt.widgets.Widget:createWidget (int)
> in <0x0004e> org.eclipse.swt.widgets.Control:createWidget (int)
> in <0x00039> org.eclipse.swt.widgets.Scrollable:createWidget (int)
> in <0x00039> org.eclipse.swt.widgets.Decorations:createWidget (int)
> in <0x000be> org.eclipse.swt.widgets.Shell:.ctor
> (org.eclipse.swt.widgets.Display,org.eclipse.swt.widgets.Shell,int,int)
> in <0x0001a> org.eclipse.swt.widgets.Shell:.ctor
> (org.eclipse.swt.widgets.Display,int)
> in <0x00012> org.eclipse.swt.widgets.Shell:.ctor
> (org.eclipse.swt.widgets.Display)
> in <0x00047> Snippet1:Main ()
> 
> My next snippet tries to open a file dialog - DirectoryDialog, and bombs
> with this:
> Unhandled Exception: System.ArgumentNullException: Argument cannot be null.
> Parameter name: dest
> in (unmanaged) (wrapper managed-to-native)
> System.Runtime.InteropServices.Marshal:copy_to_unmanaged
> (System.Array,int,intptr,int)
> in <0x00004> (wrapper managed-to-native)
> System.Runtime.InteropServices.Marshal:copy_to_unmanaged
> (System.Array,int,intptr,int)
> in <0x00013> System.Runtime.InteropServices.Marshal:Copy
> (char[],int,intptr,int)
> in <0x0007f> JNIEnv:GetCharArrayElements (JNIEnv*,intptr,intptr)
> in <0x00078> (wrapper native-to-managed) JNIEnv:GetCharArrayElements
> (JNIEnv*,intptr,intptr)
> 
> On a related note, I've had a problem with Unicode strings in two other
> seperate projects for which I'm using
> IKVM - one with Apache libs like Xerces, and another with a pure java
> implemenation of Xlib (escher).
> For example, an escher app bombs with:
> [jungd@marvin escher-0.2.2]$ mono TestHello.exe
> 
> Unhandled Exception: System.TypeInitializationException: An exception
> was thrown by the type initializer for gnu.util.Environment --->
> System.TypeInitializationException: An exception was thrown by the type
> initializer for gnu.java.io.EncodingManager --->
> System.TypeInitializationException: An exception was thrown by the type
> initializer for java.lang.System ---> java.lang.Error: Unexpected
> problems with default decoder--- End of inner exception stack trace ---
> 
> in (unmanaged) java.lang.System:getProperty (string)
> in <0x000c1> gnu.java.io.EncodingManager:.cctor ()
> --- End of inner exception stack trace ---
> 
> in (unmanaged) gnu.java.io.EncodingManager:getDecoder ()
> in <0x0005c> java.lang.StringHelper:NewString (sbyte[],int,int)
> in <0x00017> java.lang.StringHelper:NewString (sbyte[])
> in <0x0000b> java.lang.String:newhelper (sbyte[])
> in <0x000ef> gnu.util.Environment:.cctor ()
> --- End of inner exception stack trace ---
> 
> in (unmanaged) gnu.util.Environment:value (string)
> in <0x00091> gnu.x11.Application:.ctor (string[])
> in <0x00045> gnu.x11.test.TestHello:.ctor (string[])
> in <0x00048> gnu.x11.test.TestHello:Main ()
> 
> I'm wondering if there is a java property I have to set or something.
> How do I do that for IKVM?  Any idea if there is a property pertaining
> to unicode string encoding
> classes or something like that? (I ask this because Xerces(?) prints a
> "Warning: Could not get charToByteConverterClass!" message before
> returning a null.)
> Could this be a classpath problem?
> 
> At some point I saw some ikvm.exe.config (or similar) files - what are
> those for?
> (can't seem to find any now).
> 
> Cheers,
> -David.
> 
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