[Ikvm-developers] Using SWT [new problems]

[David J. <ju...@or...>]

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.