1. Need help wrapping a structure
I've started wrapping libX11 in hopes that I can use it to write X
apps. I've got about 950 lines of code wrapped so far, and I've hit my
first road block. The following structure "_XImage" contains a
structure "funcs" that seems to point to routines in memory. I'm using
c_struct.e by David Cuny (from his GTK library) which works much the
same as Win32Lib or tk_mem.e. If someone could help me out, that'd be
great, so I can continue to wrap this library.
typedef struct _XImage {
int width, height; /* size of image */
int xoffset; /* number of pixels offset in X direction */
int format; /* XYBitmap, XYPixmap, ZPixmap */
char *data; /* pointer to image data */
int byte_order; /* data byte order, LSBFirst, MSBFirst */
int bitmap_unit; /* quant. of scanline 8, 16, 32 */
int bitmap_bit_order; /* LSBFirst, MSBFirst */
int bitmap_pad; /* 8, 16, 32 either XY or ZPixmap */
int depth; /* depth of image */
int bytes_per_line; /* accelarator to next line */
int bits_per_pixel; /* bits per pixel (ZPixmap) */
unsigned long red_mask; /* bits in z arrangment */
unsigned long green_mask;
unsigned long blue_mask;
XPointer obdata; /* hook for the object routines to hang on */
struct funcs { /* image manipulation routines */
struct _XImage *(*create_image)(
struct _XDisplay* /* display */,
Visual* /* visual */,
unsigned int /* depth */,
int /* format */,
int /* offset */,
char* /* data */,
unsigned int /* width */,
unsigned int /* height */,
int /* bitmap_pad */,
int /* bytes_per_line */);
int (*destroy_image) (struct _XImage *);
unsigned long (*get_pixel) (struct _XImage *, int, int);
int (*put_pixel) (struct _XImage *, int, int, unsigned long);
struct _XImage *(*sub_image)(struct _XImage *, int, int, unsigned
int, unsigned int);
int (*add_pixel) (struct _XImage *, long);
} f;
} XImage;
~Greg
2. Re: Need help wrapping a structure
Greg Haberek wrote:
>
> I've started wrapping libX11 in hopes that I can use it to write X
> apps.
Greg:
You can already use libX11; plus Motif + XT + Athena with XMOTOR
To use any structure all you have to do describe it with record.
It also can use nested structures.
Down-load XMOTOR and look at the x demos.
Bernie
My files in archive:
WMOTOR, XMOTOR, W32ENGIN, MIXEDLIB, EU_ENGIN, WIN32ERU, WIN32API
Can be downloaded here:
http://www.rapideuphoria.com/cgi-bin/asearch.exu?dos=on&win=on&lnx=on&gen=on&keywords=bernie+ryan
3. Re: Need help wrapping a structure
Bernie Ryan wrote:
>
> Greg Haberek wrote:
> >
> > I've started wrapping libX11 in hopes that I can use it to write X
> > apps.
That's awesome, Greg. I wanted to wrap libX, but i didn't really know where to
start. I'm not very good at wrapping libraries. I would definitely want to use an
X wrapper, if you can get it working. 
I'm also trying to figure out how to wrap either ALSA or Jack for sound. I
started an ALSA wrapper, but it just crashes when i try to use it. The API is
rather confusing.
> Greg:
>
> You can already use libX11; plus Motif + XT + Athena with XMOTOR
> To use any structure all you have to do describe it with record.
> It also can use nested structures.
> Down-load XMOTOR and look at the x demos.
>
> Bernie
>
> My files in archive:
> WMOTOR, XMOTOR, W32ENGIN, MIXEDLIB, EU_ENGIN, WIN32ERU, WIN32API
>
> Can be downloaded here:
> <a
> href="http://www.rapideuphoria.com/cgi-bin/asearch.exu?dos=on&win=on&lnx=on&gen=on&keywords=bernie+ryan">http://www.rapideuphoria.com/cgi-bin/asearch.exu?dos=on&win=on&lnx=on&gen=on&keywords=bernie+ryan</a>
Bernie, that's really cool that you made those libraries, but unfortunately, I
can't use XMOTOR because it's partially shrouded. No offense, but that doesn't do
any good for open source software. So, I need to keep searching for another
solution.
As I develop FluidAE, I'm trying to come up with good cross-platform APIs for
graphics, sound, networking, file management, etc. It seems to be difficult to
find libraries that don't depend on 3rd-party C or C++ libraries (wxWidgets,
BASS, etc.)
I was trying to use wxEuphoria, which is really cool, but it seems to be a
little to complicated and buggy. Maybe I'm doing something wrong...
Anyway, good luck Greg, I wish I could help you.
~Ryan W. Johnson
Fluid Application Environment
http://www.fluidae.com/
[cool quote here, if i ever think of one...]
4. Re: Need help wrapping a structure
Hi Greg,
I don't know how win32lib work with structures, but the way I would do it is:
<EUCODE>
constant
-- typedef struct _XImage {
width = 0, --
height = 4,
xoffset = 8,
format = 12,
pdata = 16, -- this is a pointer (4 bytes)
byte_order = 20,
bitmap_unit = 24,
bitmap_bit_order = 28,
depth = 32,
bytes_per_line = 36,
bits_per_pixel = 40,
red_mask = 44,
green_mask = 48,
blue_mask = 52,
pobdta = 56, -- this is a pointer (4 bytes)
-- struc funcs (one pointer per function)
pfn_create_image = 60,
pfn_destroy_image = 64,
pfn_get_pixel = 68,
pfn_put_pixel = 72,
pfn_sub_image = 76,
pfn_add_pixel = 80,
XImage_SIZE = 84 -- size of structure in bytes
</EUCODE>
hoping this may help
regards,
jacques deschênes
5. Re: Need help wrapping a structure
On Fri, 2 Jun 2006 03:40:00 -0400, Greg Haberek <ghaberek at gmail.com>
wrote:
>The following structure "_XImage" contains a
>structure "funcs" that seems to point to routines in memory.
<snip>
> struct funcs { /* image manipulation routines */
> struct _XImage *(*create_image)(
<snip to ")">
> int (*destroy_image) (struct _XImage *);
> unsigned long (*get_pixel) (struct _XImage *, int, int);
> int (*put_pixel) (struct _XImage *, int, int, unsigned long);
> struct _XImage *(*sub_image)(struct _XImage ...);
> int (*add_pixel) (struct _XImage *, long);
> } f;
>} XImage;
></eucode>
{{{
Looks to me like you should treat that as a block of 5 pointers.
Calling them at the right time with the right parameters might prove
interesting
)
6. Re: Need help wrapping a structure
> That's awesome, Greg. I wanted to wrap libX, but i didn't really know where to
> start. I'm not very good at wrapping libraries. I would definitely want to use an
> X wrapper, if you can get it working.
I'm good at wrapping libraries, I've done several now, but this is my
first crack at a major Linux programming project.
> Bernie, that's really cool that you made those libraries, but unfortunately, I
> can't use XMOTOR because it's partially shrouded. No offense, but that doesn't do
> any good for open source software. So, I need to keep searching for another
> solution.
> As I develop FluidAE, I'm trying to come up with good cross-platform APIs for
> graphics, sound, networking, file management, etc. It seems to be difficult to
> find libraries that don't depend on 3rd-party C or C++ libraries (wxWidgets,
> BASS, etc.)
>
> I was trying to use wxEuphoria, which is really cool, but it seems to be a
> little to complicated and buggy. Maybe I'm doing something wrong...
This is the same issue I have, but for different reasons. I want to be
able to compile my apps into a single executable. On Windows, I have
Win32Lib for this. But on Linux, I've found an issue one way or
another. wxEuphoria requires a .so, XMOTOR is partially shrouded (and
a bit confusing, simply because I'm used to Win32Lib and I like its
interface).
> Anyway, good luck Greg, I wish I could help you.
Thanks! :)
7. Re: Need help wrapping a structure
> Looks to me like you should treat that as a block of 5 pointers.
> Calling them at the right time with the right parameters might prove
> interesting)
Yes, I realize that now, too. The structure seemed complicated because
I thought all the functions had to be defined within the structure
itself. Then I realized that the 'funcs' structure was just 6
pointers. I'll cross the 'calling' bridge when I get to it.
~Greg
8. Re: Need help wrapping a structure
Greg Haberek wrote:
>
> I've started wrapping libX11 in hopes that I can use it to write X
> apps. I've got about 950 lines of code wrapped so far, and I've hit my
> first road block. The following structure "_XImage" contains a
> structure "funcs" that seems to point to routines in memory. I'm using
> c_struct.e by David Cuny (from his GTK library) which works much the
> same as Win32Lib or tk_mem.e. If someone could help me out, that'd be
> great, so I can continue to wrap this library.
Here it is in win32lib 'speak'
-- _XImage
XImage_width = allot(Int), --;/* width of image */
XImage_height = allot(Int), --;/* height of image */
XImage_xoffset = allot(Int), --;/* number of pixels offset in X
direction */
XImage_format = allot(Int), --;/* XYBitmap, XYPixmap, ZPixmap */
XImage_data = allot(Ptr), --;/* pointer to image data */
XImage_byte_order = allot(Int), --;/* data byte order, LSBFirst,
MSBFirst */
XImage_bitmap_unit = allot(Int), --;/* quant. of scanline 8, 16, 32 */
XImage_bitmap_bit_order = allot(Int), --;/* LSBFirst, MSBFirst */
XImage_bitmap_pad = allot(Int), --;/* 8, 16, 32 either XY or ZPixmap
*/
XImage_depth = allot(Int), --;/* depth of image */
XImage_bytes_per_line = allot(Int), --;/* accelarator to next line */
XImage_bits_per_pixel = allot(Int), --;/* bits per pixel (ZPixmap) */
XImage_red_mask = allot(ULong), --;/* bits in z arrangment */
XImage_green_mask = allot(ULong), --;
XImage_blue_mask = allot(ULong), --;
XImage_obdata = allot(Ptr), --;/* hook for the object routines to
hang on */
--/* image manipulation routines */
XImage_f_create_image = allot(Ptr),
XImage_f_destroy_image = allot(Ptr),
XImage_f_get_pixel = allot(Ptr),
XImage_f_put_pixel = allot(Ptr),
XImage_f_sub_image = allot(Ptr),
XImage_f_add_pixel = allot(Ptr),
SIZEOF_XImage = w32allotted_size()
--
Derek Parnell
Melbourne, Australia
Skype name: derek.j.parnell
9. Re: Need help wrapping a structure
Greg Haberek wrote:
> This is the same issue I have, but for different reasons. I want to be
> able to compile my apps into a single executable. On Windows, I have
> Win32Lib for this. But on Linux, I've found an issue one way or
> another. wxEuphoria requires a .so, XMOTOR is partially shrouded (and
> a bit confusing, simply because I'm used to Win32Lib and I like its
> interface).
>
Greg:
If you are going to use Euphoria and not a compiler then
you will have to use SO's.
To use the X-libraries you would have to compile and link.
It took me 6-months to figure out how to use the widgets and
SO's without getting exception errors. Also using resources
took me some time to figure out. Wrapping the SO's is the
easy part. Creating running programs is the difficult part.
You will find that it is not easy as using window's DLL's
If you want to use apps in a single executable then you can bind
a program to XMOTOR.
Bernie
My files in archive:
WMOTOR, XMOTOR, W32ENGIN, MIXEDLIB, EU_ENGIN, WIN32ERU, WIN32API
Can be downloaded here:
http://www.rapideuphoria.com/cgi-bin/asearch.exu?dos=on&win=on&lnx=on&gen=on&keywords=bernie+ryan
10. Re: Need help wrapping a structure
- Posted by "Greg Haberek" <ghaberek at gmail.com>
Jun 03, 2006
-
Last edited Jun 04, 2006
> If you are going to use Euphoria and not a compiler then
> you will have to use SO's.
Yes, but libX11.so comes with every linux distribution with X-Windows.
Things like Motif, etc. may not be.
> To use the X-libraries you would have to compile and link.
I'm fine with dynamicly linking an already distributed library, like
libX11. What I'm not fine with is having to distribute another
library, like wxEuphoria.so.
> It took me 6-months to figure out how to use the widgets and
> SO's without getting exception errors. Also using resources
> took me some time to figure out. Wrapping the SO's is the
> easy part. Creating running programs is the difficult part.
> You will find that it is not easy as using window's DLL's
Doesn't XMOTOR use 3rd party windowing libraries, like Motif, Athena,
XT, etc? And no offense, but I don't like your approach in XMOTOR. Its
too abstracted, too many strings.
I'm taking this a step at a time. I'll let everyone know how I progress.
~Greg
11. Re: Need help wrapping a structure
- Posted by irv mullins <irvm at ellijay.com>
Jun 03, 2006
-
Last edited Jun 04, 2006
Greg Haberek wrote:
> I'm fine with dynamicly linking an already distributed library, like
> libX11. What I'm not fine with is having to distribute another
> library, like wxEuphoria.so.
...
> I'm taking this a step at a time. I'll let everyone know how I progress.
>
One thing you need to be aware of: there's a reason for libraries like
wxWindows, Motif, GTK. xlib doesn't know anything about buttons, menus,
scrollbars,
etc. You have to create those yourself. I quote:
"Because of its low-level interface, like the Microsoft Windows SDK, it can make
for some
very complex programs that apparently achieve very little. One book on the
author's shelves
contains a version of the 'Hello World' program written for Xlib. It does
nothing other than
display 'Hello World' in a window, together with a button marked 'Exit', which
does the obvious
thing when you press it. The program listing runs to five pages!"
- Beginning Linux Programming, 2nd Edition, Stones & Matthew
12. Re: Need help wrapping a structure
> One thing you need to be aware of: there's a reason for libraries like
> wxWindows, Motif, GTK. xlib doesn't know anything about buttons, menus,
> scrollbars,
> etc. You have to create those yourself. I quote:
Yes I am aware of this. Oddly enough, I like that. I am aware that
this is not a simple 'wrap' and go. I want something that is as easy
to use as Win32Lib, and I want it done right. I don't like all the
other windowing libraries out there. GTK, Motif, etc. They're just not
what I want to use. So I'm writing my own. In Euphoria.
Step 1: Create full libX11 wrapper. (50% complete)
Step 2: Test wrapper by translating various C libX11 demo programs to Euphoria.
Step 3: Using C demos as a guide, create a high-level interface
similar to Win32Lib.
Step 4: Re-create C demos using new interface.
Step 5: Release to public.
~Greg
13. Re: Need help wrapping a structure
On Sat, 3 Jun 2006 16:34:14 -0400, Greg Haberek <ghaberek at gmail.com>
wrote:
>And no offense, but I don't like your approach in XMOTOR. Its
>too abstracted, too many strings.
>
>I'm taking this a step at a time. I'll let everyone know how I progress.
I don't want to rain on your parade here, but from what I've heard it
is common wisdom not to attempt direct 'X' api programming. I hope
you've got a book and/or some sample (C) code to go on.
If you know of any code samples on the web, I wouldn't mind a link,
just out of curiosity
Regards,
Pete
14. Re: Need help wrapping a structure
Pete Lomax wrote:
> I don't want to rain on your parade here, but from what I've heard it
> is common wisdom not to attempt direct 'X' api programming. I hope
> you've got a book and/or some sample (C) code to go on.
>
> If you know of any code samples on the web, I wouldn't mind a link,
> just out of curiosity
>
> Regards,
> Pete
>
>
http://www.sbin.org/doc/Xlib/chapt_03.html
http://en.wikipedia.org/wiki/Xlib
15. Re: Need help wrapping a structure
> I don't want to rain on your parade here, but from what I've heard it
> is common wisdom not to attempt direct 'X' api programming. I hope
> you've got a book and/or some sample (C) code to go on.
But I like rain. :) Here's my opinion on it: I am new to Linux GUI
programming. Why not start from the bottom? From what I've read, its
not that difficult. I'm basicly just writing an X toolkit (like Motif
or XT) for Euphoria, in Euphoria.
> If you know of any code samples on the web, I wouldn't mind a link,
> just out of curiosity
Here's the start of my tutorial/example bookmarks:
http://tronche.com/gui/x/
http://users.actcom.co.il/~choo/lupg/tutorials/xlib-programming/xlib-programming.html
http://www.xmission.com/~georgeps/documentation/tutorials/tmp.html
http://www.ac3.edu.au/SGI_Developer/books/XLib_PG/sgi_html/front.html
http://www.everything2.com/index.pl?node=Xlib
~Greg
16. Re: Need help wrapping a structure
Greg Haberek wrote:
>
> > One thing you need to be aware of: there's a reason for libraries like
> > wxWindows, Motif, GTK. xlib doesn't know anything about buttons, menus,
> > scrollbars,
> > etc. You have to create those yourself. I quote:
>
> Yes I am aware of this. Oddly enough, I like that. I am aware that
> this is not a simple 'wrap' and go. I want something that is as easy
> to use as Win32Lib, and I want it done right. I don't like all the
> other windowing libraries out there. GTK, Motif, etc. They're just not
> what I want to use. So I'm writing my own. In Euphoria.
>
> Step 1: Create full libX11 wrapper. (50% complete)
> Step 2: Test wrapper by translating various C libX11 demo programs to
> Euphoria.
> Step 3: Using C demos as a guide, create a high-level interface
> similar to Win32Lib.
> Step 4: Re-create C demos using new interface.
> Step 5: Release to public.
>
> ~Greg
>
>
Greg, this sounds like just what i need to get FluidAE working on Linux. It
worked ok on windows, using win32lib, but i got sick of windows and switched to
linux thinking I would be able to port FluidAE. But, here I am a year later, and
still no new release of FluidAE. 
WxWidgets is too complex for me. I just need a simple library for:
1) creating windows and pixmaps
2) getting events from windows
3) drawing to windows and pixmaps
I like the idea of using the lowest layer possible (xlib), it's just more
efficient. We have win32api wrappers for euphoria, so why not xlib, right?
I don't know if you've looked at FluidAE, but the GUI's widget system is written
in 100% euphoria. I'm designing it to be very easy to use. About a year ago when
i was running it on Windows, it looked like this:
http://www.fluidae.com/images/ss_18-jul-05.jpg.
As you can see, it's pretty much complete enough to make basic applications, but
I need good graphics libraries to run on any platform.
I would be very interesting in testing your library as soon as it's ready.
~Ryan W. Johnson
Fluid Application Environment
http://www.fluidae.com/
[cool quote here, if i ever think of one...]
17. Re: Need help wrapping a structure
> WxWidgets is too complex for me. I just need a simple library for:
> 1) creating windows and pixmaps
> 2) getting events from windows
> 3) drawing to windows and pixmaps
That's *ALL* Xlib does anyway. :)
> I don't know if you've looked at FluidAE, but the GUI's widget system is
> written in 100% euphoria. I'm designing it to be very easy to use. About a year
> ago when i was running it on Windows, it looked like this:
> http://www.fluidae.com/images/ss_18-jul-05.jpg.
Yes, I looked at it before. I like the idea. Hopefully my advances of
Xlib will help you with FluidAE.
~Greg
