OpenEuphoria

1. WxEuphoria on ARM

• Posted by Jerome Nov 20, 2011
• 2943 views

Matt,

I've been using wxEuphoria on my ARM platform but I'm having trouble capturing mouse events. Since I had to cross-compile wxWidgets as well, I tried running one of the sample programs that captures mouse events and it works fine on my device. Here is the snippet of what their code looks like:

void BombsCanvas::OnMouseEvent(wxMouseEvent& event) 
{ 
    const int gridWidth = m_game->GetWidth(); 
    const int gridHeight = m_game->GetHeight(); 
 
    wxCoord fx, fy; 
    event.GetPosition(&fx, &fy); 
.... 

Now looking in wxEuphoria.cpp we have the following which seems perfectly reasonable:

object WXEUAPI  mouse_event_position(intptr_t event) 
{ 
        s1_ptr pos = NewS1(2); 
        wxMouseEvent * e = (wxMouseEvent*) event; 
        pos->base[1] = e->GetX(); 
        pos->base[2] = e->GetY(); 
        return MAKE_SEQ( pos ); 
} 

But anytime my wxEuphoria progam tries to get the position of a mouse event, I get a segementation fault. GDB returns the following:

0x4024edfc in wxMouseEvent::GetX() const () from /usr/lib/libwxeu.so.16 
0x4024edfc <_ZNK12wxMouseEvent4GetXEv+20>:    ldr   r3,   [r3, #36] 

Any thoughts on what the difference could be? I see that wxEuphoria uses a different wxMouseEvent procedure than the example ( GetX() vs. GetPosition() ), but neither method works on my device.

Thanks in advance,
Ira

3. Re: WxEuphoria on ARM

• Posted by Jerome Nov 21, 2011
• 2636 views

BRyan,

Thanks for the reply! To clarify the problem:

The first snippet which uses event.GetPosition(&fx, &fy) is from a wxWidgets demo program and does work on my ARM platform.

The second snippet which uses e->GetX() is from the wxEuphoria source code and does not work, crashing with segmentation faults.

wxWidgets provides several ways to access the mouse position for a wxMouseEvent but these methods do not work inside of wxEuphoria programs for some reason. Could there be a problem with the type conversion for some reason?

wxMouseEvent * e = (wxMouseEvent*) event 

Thanks,
Ira

5. Re: WxEuphoria on ARM

• Posted by mattlewis (admin) Nov 21, 2011
• 2651 views

It doesn't make sense to me why one would break and the other work. Try changing the wxEuphoria code to:

object WXEUAPI  mouse_event_position(intptr_t event) 
{ 
        s1_ptr pos = NewS1(2); 
        wxMouseEvent * e = (wxMouseEvent*) event; 
        e->getPosition( pos->base + 1, pos->base + 2 ); 
        return MAKE_SEQ( pos ); 
} 

That code should be equivalent. Maybe that's what you already tried. The only quirk I'm really aware of is the problems with reading unaligned data. I wouldn't have thought it would be an issue here. Alternatively, you could try:

object WXEUAPI  mouse_event_position(wxMouseEvent *event) 
{ 
        s1_ptr pos = NewS1(2); 
        event->getPosition( pos->base + 1, pos->base + 2 ); 
        return MAKE_SEQ( pos ); 
} 

This breaks my convention that allows easy automatic wrapping, but maybe it will fix whatever weirdness you're running into with this function.

Matt

7. Re: WxEuphoria on ARM

• Posted by raseu Nov 23, 2011
• 2551 views

Yes

I'm interested in using Euphoria under ARM

hopefully it should be doable to compile
android for the PI.

a combination of PI + android + Euphoria would
make a nice dev target.

I would like to have the option of Euphoria running
against a shared library to save disk space for the PI,
instead of all binaries being statically linked.

i did have some shell script for v3 of Euphoria that would
link against the eu.a library compiled as a .so/.dll

feature request ?

maybe a new keyword

 
--// NOW 
--// automatically compiles and links statically 
include std/math.e 
 
--// ADDITIONAL 
--// function/procedure syntax check interface only 
--// similar to 'C' includes to check function signatures 
--// 
--// then link against command line -leui -leui-std  
--// 
--// where 
--// 
--//    -leui      = libeui.[so|dll]     from eu.a 
--//    -leui-std  = libeui-std.[so|dll] from std/*.e 
import std/math.e 

ras

9. Re: WxEuphoria on ARM

• Posted by coconut Nov 27, 2011
• 2373 views

object WXEUAPI  mouse_event_position(wxMouseEvent *event) 
{ 
        s1_ptr pos = NewS1(2); 
        event->getPosition( pos->base + 1, pos->base + 2 ); 
        return MAKE_SEQ( pos ); 
} 

I sent a post a few month ago about compiling euphoria on my Efika netbook. But I had a problem running some of the examples program that comes with euphoria. At the time someone suggested some solution but I didn't take the time to look at it. I would be happy to use euphoria on my Efika but I won't spend time trying to debug the source code. I'm waiting for a stable and working euphhoria for ARM platform. Until then I stick to C programming.

Jacques

11. Re: WxEuphoria on ARM

• Posted by Jerome Nov 28, 2011
• 2272 views

I believe that last time you were having a problem with "missing magic". I've noticed that this happens to me when I use different cross-compilers for my ARM system. Can you post information about the compiler on your Efika notebook?

Thanks,
Ira

13. Re: WxEuphoria on ARM

• Posted by Jerome Dec 01, 2011
• 2111 views

I've been using CodeSourcery toolchains for ARM.

>> sb2 -t armel gcc --version 
>>    arm-none-linux-gnueabi-gcc (Sourcery G++ Lite 2011.03-41) 4.5.2 

I'll grab the same version gcc crosscompiler and play with that.

Thanks,
Ira

15. Re: WxEuphoria on ARM

• Posted by Jerome Jan 12, 2012
• 1885 views

object WXEUAPI  mouse_event_position(wxMouseEvent *event) 
{ 
	wxCoord fx, fy; 
        event->getPosition( &fx, &fy ); 
        s1_ptr pos = NewS1(2); 
	memcpy(pos->base + 1, &fx, sizeof(wxCoord)); 
	memcpy(pos->base + 2, &fy, sizeof(wxCoord)); 
        return MAKE_SEQ( pos ); 
} 

Thanks for looking into this again! Unfortunately, I get the segmentation fault when calling the member function GetPosition of wxMouseEvent. I wasn't able to find a solution. In the mean time I've been using C+ + and wxFormBuilder. In this way the code for the GUI and the boiler plate C+ + stuff is generated for me; you just need to fill in your code to handle events.

I'd be curious to know if you have any issues with wxEuphoria on your Nook Color. I also plan on trying it on the Raspberry Pi for another data point.

Thanks,
Ira

17. Re: WxEuphoria on ARM

• Posted by Jerome Jan 14, 2012
• 1855 views

Good to know, thanks!

object WXEUAPI  mouse_event_position(wxMouseEvent *event) 
{ 
	wxMouseEvent wme = *event; 
        s1_ptr pos = NewS1(2); 
        wme.GetPosition( pos->base + 1, pos->base + 2 ); 
        return MAKE_SEQ( pos ); 
} 

It looks like it is crashing on the dereference of the event; I get the following in gdb:

Program received signal SIGEGV, Segmentation fault. 
0x40da70c0 in wxEvent::wxEvent(wxEvent const&) () 
 from libwx_base-2.8.so.0 

object WXEUAPI  mouse_event_position(wxMouseEvent event&) 
{ 
        s1_ptr pos = NewS1(2); 
        event.GetPosition( pos->base + 1, pos->base + 2 ); 
        return MAKE_SEQ( pos ); 
} 

This one crashes on the GetPosition:

Program received signal SIGEGV, Segmentation fault. 
0x40650418 in wxMouseEvent::GetPosition(int*, int*) const () 
 from libwxeu.so.16 

Thanks,
Ira