Question

Run-Time Check Failure #2 - Stack around the variable 'b' was corrupted.

Asked by: simon_holroyd

Hello,

When executing the following code I get this error: Run-Time Check Failure #2 - Stack around the variable 'b' was corrupted.

Can someone tell me why as it's really annoying and probably just something silly.

char *list[] = {"Simon",
                              "Nancy",
                              "Mark",
                              "Banana"};
      
      int biggest=0;
      char b   =NULL;
      int size =0;
      for(int i=0; i < 4; i++) {
            int size = strlen(list[i]);
            if(size > biggest)
                  biggest = size;
      }
      
      AfxMessageBox(_itoa(biggest,&b,10),MB_OK,0);

Also, how can I output debug data without using AfxMessageBox everytime?

This is an Visual C++ MFC project.

Cheers

-Simon

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Asked On
2004-07-21 at 07:33:58ID21066301
Tags

around

,

stack

,

check

,

failure

,

variable

Topic

Microsoft Visual C++.Net

Participating Experts
3
Points
250
Comments
4

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Answers

 

by: AlexFMPosted on 2004-07-21 at 07:47:20ID: 11603226

Replace
char b   =NULL;

with
char b[10];

...

AfxMessageBox(_itoa(biggest,b,10),MB_OK,0);    // without &

Instead of MessageBox you can use TRACE or OutputDebugString:

CString s;
s.Format("%d\n", biggest);
TRACE(s);

 

by: nonubikPosted on 2004-07-22 at 03:54:51ID: 11610967

To explain a little

>char b   =NULL;
...
>(_itoa(biggest,&b,10)

_itoa tries to convert the digits of the given value argument ('biggest') to a null-terminated character string. This means at least 2 bytes. You only pass as argument the address of one single byte and the second one is not alocated.

 

by: Svetlin_PanayotovPosted on 2004-07-23 at 01:01:32ID: 11619482

     char *list[] = {"Simon",
                         "Nancy",
                         "Mark",
                         "Banana"};
     
     int biggest=0;
     char* b;
     int size =0;
     for(int i=0; i < 4; i++) {
          int size = strlen(list[i]);
          if(size > biggest)
               biggest = size;
     }
       b = new char[2];            //if you have name longer than 99 chars this will not work
       AfxMessageBox(_itoa(biggest,b,10),MB_OK,0);      //note - no &
       delete[] b;      //free the allocated memory

This should work :)

 

by: simon_holroydPosted on 2004-07-23 at 13:21:03ID: 11624997

Points split appropriately, thanks for the answers.

20120131-EE-VQP-002

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