OpenEuphoria: Forum: RE: C structs & bad aftershave...

1. RE: C structs & bad aftershave...

Posted by Steve <bleak_outlook at hotmail.com> Feb 25, 2006
447 views

Anyone have any idea about this?

Do you need more information?  Is it not possible?

Hello?  :)

Steve



Steve wrote:
> 
> 
> Ok no Old Spice... I just wanted some attention! :)
> 
> Background: Lest I get ahead of myself.
> I am using M Akita's SDL for Eu wrapper. SDL is compiled into a DLL.
> I want to access a member of a C structure. 
> 
> typedef struct{
>   Uint32 hw_available:1;
>   Uint32 wm_available:1;
>   Uint32 blit_hw:1;
>   Uint32 blit_hw_CC:1;
>   Uint32 blit_hw_A:1;
>   Uint32 blit_sw:1;
>   Uint32 blit_sw_CC:1;
>   Uint32 blit_sw_A:1;
>   Uint32 blit_fill;
>   Uint32 video_mem;
>   SDL_PixelFormat *vfmt;
> } SDL_VideoInfo;
> 
> I can access its value by doing this:
> 
> atom videoInfo
> 
> videoInfo = SDL_GetVideoInfo()
> 
> How do I, using Euphoria, best go about reading the above bit flags?
> I have tried this:
> 
> <EuCode)
> sequence mbits
> atom lflg
> 
> mbits = int_to_bits(videoInfo)
> 
> sprintf("flags: %d %d %d ...<snip>", {mbits[1], mbits[2], ...<snip>})
> 
> <EuCode>
> 
> Which gives me some really odd results.  When I peek 36 bytes into this 
> structure, and grab 4 bytes, I do get the correct amount of video memory 
> 
> for my graphics card.  There ends my success though.
> 
> Could someone explain to me how to access the bit flags of that struct?
> I seem to be doing this all wrong despite my best intentions. :)
> 
> For more info, here is the SDL API page.
> http://www.libsdl.org/cgi/docwiki.cgi/SDL_20API
> 
> Thanks again. As always, you guys rule.
>

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2. RE: C structs & bad aftershave...

Posted by Bernie Ryan <xotron at bluefrog.com> Feb 25, 2006
436 views

Steve wrote:
> 
> 
> Anyone have any idea about this?
> 
> Do you need more information?  Is it not possible?
> 
> Hello?  :)
> 
> Steve
> 
> 
> Steve wrote:
> > 
> > 
> > Ok no Old Spice... I just wanted some attention! :)
> > 
> > Background: Lest I get ahead of myself.
> > I am using M Akita's SDL for Eu wrapper. SDL is compiled into a DLL.
> > I want to access a member of a C structure. 
> > 
> > typedef struct{
> >   Uint32 hw_available:1;
> >   Uint32 wm_available:1;
> >   Uint32 blit_hw:1;
> >   Uint32 blit_hw_CC:1;
> >   Uint32 blit_hw_A:1;
> >   Uint32 blit_sw:1;
> >   Uint32 blit_sw_CC:1;
> >   Uint32 blit_sw_A:1;
> >   Uint32 blit_fill;
> >   Uint32 video_mem;
> >   SDL_PixelFormat *vfmt;
> > } SDL_VideoInfo;
> > 
> > I can access its value by doing this:
> > 
> > atom videoInfo
> > 
> > videoInfo = SDL_GetVideoInfo()
> > 
> > How do I, using Euphoria, best go about reading the above bit flags?
> > I have tried this:
> > 
> > <EuCode)
> > sequence mbits
> > atom lflg
> > 
> > mbits = int_to_bits(videoInfo)
> > 
> > sprintf("flags: %d %d %d ...<snip>", {mbits[1], mbits[2], ...<snip>})
> > 
> <font color="#330033">> <EuCode&gt;</font>
> <font color="#330033">> </font>
> <font color="#330033">> Which gives me some really odd results.  When I
> </font><font color="#FF00FF">peek </font><font color="#330033">36 bytes into this
> </font>
> <font color="#330033">> structure, </font><font color="#0000FF">and
> </font><font color="#330033">grab 4 bytes, I </font><font color="#0000FF">do
> </font><font color="#330033">get the correct amount of video memory </font>
> <font color="#330033">> </font>
> <font color="#330033">> </font><font color="#0000FF">for </font><font
> color="#330033">my graphics card.  There ends my success though.</font>
> <font color="#330033">> </font>
> <font color="#330033">> Could someone explain </font><font color="#0000FF">to
> </font><font color="#330033">me how </font><font color="#0000FF">to </font><font
> color="#330033">access the bit flags of that struct?</font>
> <font color="#330033">> I seem </font><font color="#0000FF">to </font><font
> color="#330033">be doing this all wrong despite my best intentions. :)</font>
> <font color="#330033">> </font>
> <font color="#330033">> For more info, here is the SDL API page.</font>
> <font color="#330033">> http://www.libsdl.org/cgi/docwiki.cgi/SDL_20API</font>
> <font color="#330033">> </font>
> <font color="#330033">> Thanks again. As always, you guys rule.</font>
> <font color="#330033">> </font>
> <font color="#330033"></font>
> <font color="#330033"></font>

Steve:

Uint32 is a 32bit unsigned integer

In order to look at bitfield hw_available you have to AND
the binary number 1000 0000 0000 0000  or #8000 hex with
Uint32 portion of the structure 

Therefore:  and_bits(Uint32,#8000) would give you hw_available
            
                    -- binary 0010 0000 0000 0000
            and_bits(Uint32,#4000) would give you blit_hw
   etc.
 
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

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3. RE: C structs & bad aftershave...

Posted by Bernie Ryan <xotron at bluefrog.com> Feb 25, 2006
432 views

Steve wrote:
> 
> 
> Anyone have any idea about this?
> 
> Do you need more information?  Is it not possible?
> 
> Hello?  :)
> 
> Steve
> 
> 
> Steve wrote:
> > 
> > 
> > Ok no Old Spice... I just wanted some attention! :)
> > 
> > Background: Lest I get ahead of myself.
> > I am using M Akita's SDL for Eu wrapper. SDL is compiled into a DLL.
> > I want to access a member of a C structure. 
> > 
> > typedef struct{
> >   Uint32 hw_available:1;
> >   Uint32 wm_available:1;
> >   Uint32 blit_hw:1;
> >   Uint32 blit_hw_CC:1;
> >   Uint32 blit_hw_A:1;
> >   Uint32 blit_sw:1;
> >   Uint32 blit_sw_CC:1;
> >   Uint32 blit_sw_A:1;
> >   Uint32 blit_fill;
> >   Uint32 video_mem;
> >   SDL_PixelFormat *vfmt;
> > } SDL_VideoInfo;
> > 
> > I can access its value by doing this:
> > 
> > atom videoInfo
> > 
> > videoInfo = SDL_GetVideoInfo()
> > 
> > How do I, using Euphoria, best go about reading the above bit flags?
> > I have tried this:
> > 
> > <EuCode)
> > sequence mbits
> > atom lflg
> > 
> > mbits = int_to_bits(videoInfo)
> > 
> > sprintf("flags: %d %d %d ...<snip>", {mbits[1], mbits[2], ...<snip>})
> > 
> <font color="#330033">> <EuCode&gt;</font>
> <font color="#330033">> </font>
> <font color="#330033">> Which gives me some really odd results.  When I
> </font><font color="#FF00FF">peek </font><font color="#330033">36 bytes into this
> </font>
> <font color="#330033">> structure, </font><font color="#0000FF">and
> </font><font color="#330033">grab 4 bytes, I </font><font color="#0000FF">do
> </font><font color="#330033">get the correct amount of video memory </font>
> <font color="#330033">> </font>
> <font color="#330033">> </font><font color="#0000FF">for </font><font
> color="#330033">my graphics card.  There ends my success though.</font>
> <font color="#330033">> </font>
> <font color="#330033">> Could someone explain </font><font color="#0000FF">to
> </font><font color="#330033">me how </font><font color="#0000FF">to </font><font
> color="#330033">access the bit flags of that struct?</font>
> <font color="#330033">> I seem </font><font color="#0000FF">to </font><font
> color="#330033">be doing this all wrong despite my best intentions. :)</font>
> <font color="#330033">> </font>
> <font color="#330033">> For more info, here is the SDL API page.</font>
> <font color="#330033">> http://www.libsdl.org/cgi/docwiki.cgi/SDL_20API</font>
> <font color="#330033">> </font>
> <font color="#330033">> Thanks again. As always, you guys rule.</font>
> <font color="#330033">> </font>
> <font color="#330033"></font>
> <font color="#330033"></font>

Steve:

The part of the structure Uint32 is a 32bit unsigned integer

In order to look at bitfield hw_available for example,  you have to AND
the binary number 1000 0000 0000 0000  or #8000 hex with
Uint32 portion of the structure 

Therefore:  and_bits(Uint32,#8000) would give you hw_available
            
                    -- binary 0010 0000 0000 0000
            and_bits(Uint32,#2000) would give you blit_hw
   etc.
 
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

new topic » goto parent » topic index » view message » categorize

4. RE: C structs & bad aftershave...

Posted by Bernie Ryan <xotron at bluefrog.com> Feb 25, 2006
446 views

Steve ignore the first post I typed #4000 instead of #2000
and sent it before I could correct it 

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

new topic » goto parent » topic index » view message » categorize

5. RE: C structs & bad aftershave...

Posted by Steve <bleak_outlook at hotmail.com> Feb 25, 2006
463 views

Hi Bernie,

Thanks for the response.  I just wanted to see if this example is up the 
right tree or not:

atom videoInfo

videoInfo = SDL_GetVideoInfo()

if and_bits(videoInfo, #8000) then
  -- hw available
else
  -- hw unavailable
end if

Does that look correct?  

Thanks for the help!

Steve












Bernie Ryan wrote:
> 
> 
> posted by: Bernie Ryan <xotron at bluefrog.com>
> 
> 
> Steve wrote:
> > 
> > 
> > Anyone have any idea about this?
> > 
> > Do you need more information?  Is it not possible?
> > 
> > Hello?  :)
> > 
> > Steve
> > 
> > 
> > Steve wrote:
> > > 
> > > 
> > > Ok no Old Spice... I just wanted some attention! :)
> > > 
> > > Background: Lest I get ahead of myself.
> > > I am using M Akita's SDL for Eu wrapper. SDL is compiled into a DLL.
> > > I want to access a member of a C structure. 
> > > 
> > > typedef struct{
> > >   Uint32 hw_available:1;
> > >   Uint32 wm_available:1;
> > >   Uint32 blit_hw:1;
> > >   Uint32 blit_hw_CC:1;
> > >   Uint32 blit_hw_A:1;
> > >   Uint32 blit_sw:1;
> > >   Uint32 blit_sw_CC:1;
> > >   Uint32 blit_sw_A:1;
> > >   Uint32 blit_fill;
> > >   Uint32 video_mem;
> > >   SDL_PixelFormat *vfmt;
> > > } SDL_VideoInfo;
> > > 
> > > I can access its value by doing this:
> > > 
> > > atom videoInfo
> > > 
> > > videoInfo = SDL_GetVideoInfo()
> > > 
> > > How do I, using Euphoria, best go about reading the above bit flags?
> > > I have tried this:
> > > 
> > > <EuCode)
> > > sequence mbits
> > > atom lflg
> > > 
> > > mbits = int_to_bits(videoInfo)
> > > 
> > > sprintf("flags: %d %d %d ...<snip>", {mbits[1], mbits[2], ...<snip>})
> > > 
> > <font color="#330033">> <EuCode></font>
> > <font color="#330033">> </font>
> > <font color="#330033">> Which gives me some really odd results.  When I 
> > </font><font color="#FF00FF">peek </font><font color="#330033">36 bytes 
> > into this </font>
> > <font color="#330033">> structure, </font><font color="#0000FF">and 
> > </font><font color="#330033">grab 4 bytes, I </font><font 
> > color="#0000FF">do </font><font color="#330033">get the correct amount 
> > of video memory </font>
> > <font color="#330033">> </font>
> > <font color="#330033">> </font><font color="#0000FF">for </font><font 
> > color="#330033">my graphics card.  There ends my success though.</font>
> > <font color="#330033">> </font>
> > <font color="#330033">> Could someone explain </font><font 
> > color="#0000FF">to </font><font color="#330033">me how </font><font 
> > color="#0000FF">to </font><font color="#330033">access the bit flags of 
> > that struct?</font>
> > <font color="#330033">> I seem </font><font color="#0000FF">to 
> > </font><font color="#330033">be doing this all wrong despite my best 
> > intentions. :)</font>
> > <font color="#330033">> </font>
> > <font color="#330033">> For more info, here is the SDL API page.</font>
> > <font color="#330033">> 
> > http://www.libsdl.org/cgi/docwiki.cgi/SDL_20API</font>
> > <font color="#330033">> </font>
> > <font color="#330033">> Thanks again. As always, you guys rule.</font>
> > <font color="#330033">> </font>
> > <font color="#330033"></font>
> > <font color="#330033"></font>
> 
> Steve:
> 
> The part of the structure Uint32 is a 32bit unsigned integer
> 
> In order to look at bitfield hw_available for example,  you have to AND
> the binary number 1000 0000 0000 0000  or #8000 hex with
> Uint32 portion of the structure 
> 
> Therefore:  and_bits(Uint32,#8000) would give you hw_available
>             
>                     -- binary 0010 0000 0000 0000
>             and_bits(Uint32,#2000) would give you blit_hw
>    etc.
>  
> 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
>

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6. RE: C structs & bad aftershave...

Posted by Bernie Ryan <xotron at bluefrog.com> Feb 25, 2006
457 views
Last edited Feb 26, 2006

Steve wrote:
> 
> Hi Bernie,
> 
> Thanks for the response.  I just wanted to see if this example is up the 
> right tree or not:
> 
> atom videoInfo
> 
> videoInfo = SDL_GetVideoInfo()
> 
> if and_bits(videoInfo, #8000) then
>   -- hw available
> else
>   -- hw unavailable
> end if
> 
> Does that look correct?  
> 
> Thanks for the help!
> 
> Steve
> 

No you will get a pointer to the structure and you will have
to peek4u the UINT32 part of the structure and use that value
to and_bits(UINT32, #8000)



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

new topic » goto parent » topic index » view message » categorize

7. RE: C structs & bad aftershave...

Posted by Steve <bleak_outlook at hotmail.com> Feb 25, 2006
476 views
Last edited Feb 26, 2006

Ok I figured it out now.  Thanks for all the help!

Steve






Bernie Ryan wrote:
> 
> 
> posted by: Bernie Ryan <xotron at bluefrog.com>
> 
> Steve wrote:
> > 
> > Hi Bernie,
> > 
> > Thanks for the response.  I just wanted to see if this example is up the 
> > 
> > right tree or not:
> > 
> > atom videoInfo
> > 
> > videoInfo = SDL_GetVideoInfo()
> > 
> > if and_bits(videoInfo, #8000) then
> >   -- hw available
> > else
> >   -- hw unavailable
> > end if
> > 
> > Does that look correct?  
> > 
> > Thanks for the help!
> > 
> > Steve
> > 
> 
> No you will get a pointer to the structure and you will have
> to peek4u the UINT32 part of the structure and use that value
> to and_bits(UINT32, #8000)
> 
> 
> 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
>

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1. RE: C structs & bad aftershave...

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