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3.8

(MS VC++) Could you explain this to me ?

Asked by andrey_2007 in Miscellaneous Programming

Tags: access, violation, what

------------| MS VC++ Code |--------------------

typedef union
{
      int            i;
      char            c;
      short            t;
} MY_UNION;

namespace SOME_SPACE { static MY_UNION uni; };

#define MY_TYPE(s,m)   SetType(((s *)&SOME_SPACE::uni)->m)

int SetType(int nValue)
{
  return 5;
}

typedef struct
{
                int                        count1;
      char                        Buffer1[257];
      char                        Buffer2[257];
      char                        Buffer3[257];
      char                        Buffer4[257];
      char                        Buffer5[257];
      char                        Buffer6[257];
      char                        Buffer7[257];
      char                        Buffer8[257];
      char                        Buffer9[257];
      char                        Buffer10[257];
      char                        Buffer11[257];
      char                        Buffer12[257];
      char                        Buffer13[257];
      char                        Buffer14[257];
      char                        Buffer15[257];
      char                        Buffer16[257];
      char                        Buffer17[257];
      char                        Buffer18[257];
      char                        Buffer19[257];
      char                        Buffer20[257];
      char                        Buffer21[257];
      char                        Buffer22[257];
      char                        Buffer23[257];
      char                        Buffer24[257];
      char                        Buffer25[257];
      char                        Buffer26[257];
      char                        Buffer27[257];
      char                        Buffer28[257];
      char                        Buffer29[257];
      char                        Buffer30[257];
      char                        Buffer31[257];
      char                        Buffer32[257];
      char                        Buffer33[257];
      char                        Buffer34[257];
      char                        Buffer35[257];
      char                        Buffer36[257];
      char                        Buffer37[257];
      char                        Buffer38[257];
      char                        Buffer39[257];
      char                        Buffer40[257];
      char                        Buffer41[257];
      char                        Buffer42[257];
      char                        Buffer43[257];
      char                        Buffer44[257];
      char                        Buffer45[257];
      char                        Buffer46[257];
      char                        Buffer47[257];
      char                        Buffer48[257];
      char                        Buffer49[257];
      char                        Buffer50[257];
      char                        Buffer51[257];
      char                        Buffer52[257];
      char                        Buffer53[257];
      char                        Buffer54[257];
      char                        Buffer55[257];
      char                        Buffer56[257];
      char                        Buffer57[257];
      char                        Buffer58[257];
      char                        Buffer59[257];
      char                        Buffer60[257];
      char                        Buffer61[257];
      char                        Buffer62[257];
      char                        Buffer63[257];
      char                        Buffer64[257];
      char                        Buffer65[257];
      char                        Buffer66[257];
      char                        Buffer67[257];
      char                        Buffer68[257];
      char                        Buffer69[257];
      char                        Buffer70[257];
      char                        Buffer71[257];
                int                        mode;

} BIG_STRUCT;


void main()
{

      int res = MY_TYPE(BIG_STRUCT, mode);

}


---------------------End of Code---------------------------


Could you explain the following to me:

If BIG_STRUCT is as big as it is shown above, the program causes an exception (Access Violation).

If we have the BIG_STRUCT structure a few character strings shorter (Buffer strings 67-71 are commented out), the program works fine.  Whats going on?


-andrey
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Zone: Miscellaneous Programming
Tags: access, violation, what
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Solution Provided By: rpz
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Solution Grade: A
 
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