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SDL_FreeSurface and segfault


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#1 killwin   Members   -  Reputation: 101

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Posted 23 October 2012 - 01:59 AM

Hello,

I I have a verry bad problem.

In my draw.h :

[source lang="cpp"]class CDraw : public CGraphic{ public : // constructor CDraw(const float& coef_resol_);...private : SDL_Surface *destimg;}[/source]

In my draw.cpp :

[source lang="cpp"]CDraw::CDraw(const float& coef_resol_) : CGraphic({0, 0}, coef_resol_), texture(NULL), destimg(NULL) {}void CDraw::~CDraw() { if(surface) SDL_FreeSurface(surface);/* segfault with it :-( */ if(destimg) SDL_FreeSurface(destimg);}[/source]

Well in all lines in draw.cpp, i'm not working with destimg. i commented all destimg. I have only destimg(NULL) and if(destimg) SDL_FreeSurface(destimg);

With gdb, with a break point before the if(destimg) i have :

(gdb) print destimg
$2 = (SDL_Surface *) 0x766177

And next a SEGFAULT.

I don t understand, thanks

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#2 BitMaster   Crossbones+   -  Reputation: 4422

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Posted 23 October 2012 - 03:01 AM

Two likely scenarios:
1) You write over the bounds of memory somewhere, thereby trashing the CDraw object and writing an invalid destimg pointer over the 0.
2) You are destroying an invalid CDraw object. Either because you delete the same object twice or you delete an uninitialized pointer.

#3 killwin   Members   -  Reputation: 101

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Posted 23 October 2012 - 07:23 AM

Solved thanks, i found a line with surface = destimg. Then i was calling SDL_FreeSurface two times on the same pointer.




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