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int LoadGLTexture(char *pFileName, int TextureId)
{
SDL_Surface* lotto[TextureId]
lotto[TextureId] = IMG_Load(TextureFileName)
...

with the above I get the error as in the title.
Why? What to change?
Many thanks


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Sounds like an error in libpng. Can you attach the PNG you're trying to load?




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Mason is right, you need to attach the PNG for us to diagnose the
problem, which should probably end up being sent to the libpng
developer mailing list.

It would also help to know what application created your PNG image.

To work around the problem, try using another application to create
your PNG image. Simply open the PNG and try to "Save As..."

On Mon, Jul 19, 2010 at 12:29 PM, mike wrote:



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On Mon, 19 Jul 2010 16:29:51 +0000 (UTC), mike wrote:

Off-by-One error. Try again.
No clue about the libpng without further information.


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On Mon, 19 Jul 2010 16:29:51 +0000 (UTC), mike wrote:

Oh, of course there is more going on here than I cared to pay any
attention to at first...

You should know that the way you have declared "lotto," it is a local
variable, and it will be lost when your LoadGLTexture() function
returns.

Also, the number of SDL_Surface* you can fit into "lotto" is
TextureId! I highly doubt that is what you intended!

You should grab a good C book and learn the basics :)

On Mon, Jul 19, 2010 at 12:40 PM, Christoph Nelles
wrote:



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Hi Donny
yes you might be wright so maybe you could help me move SDL_Surface out of the
function? This should be the way to go?
Anyway i tried as below and still randomly the error occurrs with 2-3 out of 4
png textures.

------
/// Loads one texture
int LoadGLTexture(char *pFileName, int TextureId)
{
SDL_Surface* lotto[TextureId];
SDL_RWops *rwop;
rwop=SDL_RWFromFile(TextureFileName, "rb");
lotto[TextureId]=IMG_LoadPNG_RW(rwop);

-------
declarations are:

int TextureId;
int lotto[5];

Many thanks
Michael


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Am 20.07.2010 08:33, schrieb mike:
Using RWops here makes it more complicated but still not correct. When
you declare an array int xyz[5] you have the elements xyz[0]..xyz[4].
You are writing to xyz[5], so you are writing in space that is probably
not belonging to you and in every case is not in your array. Go fetch a
C/C++ book.
Where is this declaration? It will still be shadowed by the local
declaration in the function.
http://en.wikibooks.org/wiki/C%2B%2B_Programming/Scope


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int LoadGLTexture(char *pFileName, int TextureId)
{
SDL_Surface* image
image = IMG_Load(TextureFileName)


---------
Well first I had it like above and most examples but still
got the libpng decompression error. to be precise it worked
on opensuse 11.2 but after switching to unbuntu 10.04 i got
those errors.
So the above should work? Well I'm not alone with that error:
http://www.gamedev.net/community/forums/topic.asp?topic_id=546917


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Hi,

please provide us/me with the source code and the image(s). I think the
problem might be somewhere else.

On Tue, 20 Jul 2010 08:06:48 +0000 (UTC), mike
wrote:


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/// Loads one texture
int LoadGLTexture(char *pFileName, int TextureId)
{

SDL_Surface* image;

image = IMG_Load(TextureFileName);

if (image) {
...opengl stuff
Stat = TRUE;

} else {
Stat = FALSE;
}
if (image) {
SDL_FreeSurface(image);
}
return Stat;
}

The error occurrs randomly: ### LoadGLTexture(): Error loading texture! but
image paths are correct. Images are created in Gimp.

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Please send us your PNGs

On Tue, Jul 20, 2010 at 2:33 AM, mike wrote:



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Is that the real code?  Why aren't you using pFileName?  I'd expect you to want something like this:
// Some global somewhereSDL_Surface* lotto[5];


// Somewhere, this function
int LoadGLTexture(const char* pFileName, int TextureId)
{
    int result = -1;
    SDL_Surface* image = IMG_Load(pFileName);
    if(image == NULL)
        return result;
    
    // Do OpenGL texture conversion here
    
    return result;
}


If you trust your code, then the other thing to do is to try saving the PNGs without Adam7 interlacing.  Maybe your libpng needs to be updated.  While we're at it, what version of SDL and SDL_image are you using?


Jonny D


On Tue, Jul 20, 2010 at 4:27 AM, Donny Viszneki wrote:

Eh, well you probably want that global to be 'int lotto[5]' and assign the new texture ID to lotto[TextureId] once you get it.

Jonny D


On Tue, Jul 20, 2010 at 8:03 AM, Jonathan Dearborn wrote:

I'm not using Adam 7 but could send you a image. I've sent one to Christoph and
for the code see my other posting.

This used to work on Opensuse 11.2 but since I've moved to Ubuntu 10.04 I get
this error. All default Ubuntu libs.

Most examples simply do: SDL_Surface* image;
so why did this stop working on Ubuntu? My original code should work?(see other
posting) or do I have to change according to this:
http://www.gamedev.net/community/forums/topic.asp?topic_id=546917

Anyone wanting to test send me a mail i reply & attach a image.
Thanks



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I think you need to show us more of your code, perhaps you completely mess
up the memory which causes various malfunctions.

On Tue, 20 Jul 2010 15:17:22 +0000 (UTC), Mike
wrote:
I
work?(see

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I've tried all possible changes and the error occurs immediately after IMG_Load:

No source available for "siglongjmp() "

I do a plugin for another app. Any ideas on how to proceed now?
Many thanks





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Where is the full source of your code? Everything from the main to the
function call. If you don't provide it probably nobody can help.

On Wed, 21 Jul 2010 08:34:42 +0000 (UTC), Mike
wrote:

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I do i like this now:

if (!LoadGLTexture(TextureFileName0, PANEL_TEXTURE)) {
XPLMDebugString("Panel texture failed to load\n");
LoadGLTexture(TextureFileName0, PANEL_TEXTURE);
}

works and for 4 textures I get around 8 failed messages. But I doubt this to be
good programming...and even consider filing a bug report? Well memory is hardly
changing as I call all textures one after the other.


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No luck still the same:

Single stepping until exit from function siglongjmp,
which has no line number information.
Warning:
Cannot insert breakpoint 0.
Error accessing memory address 0x131210e3: Input/output error.



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Where should I file a bug report?

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I would guess here:
http://sourceforge.net/tracker/?atid=105624&group_id=5624&func=browse

[/url]Jonny D


On Wed, Jul 21, 2010 at 11:58 AM, mike wrote:

Quote:

Where should I file a bug report? _______________________________________________ SDL mailing list [url=http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org]http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org

HI
basically I only want to do something alike:

SDL_Surface *cristal = IMG_Load("Images/cristal.png");

but it fails with a shared lib or dll. Why? What could I be doing wrong?
Many thanks
Michael


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Did you try checking IMG_GetError()?  It might tell you the problem, like if you're using an incompatible or missing dll.

Jonny D


On Fri, Jul 30, 2010 at 4:37 AM, mike wrote:

thanks but i only get:

Error reading the PNG file.

This worked only some months ago perfectly!
Any help is much appreciated
Michael





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Hi Mike,

How does it fail exactly? Does a white box show-up where there should
be something, or do you get a segfault. Probably not it, but check the
case of the file you are loading, as well as make sure you are running
the application from the appropriate directory (namely, the one that
has "Images" as a sub-directory).

Hope that helps,

John

On Sat, Jul 31, 2010 at 2:06 AM, mike wrote:
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