Has triggered a breakpoint c ошибка

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• Hello. I have the following problem. When my application is starting the following error occurs: «DelaunayWin32.exe has triggered a breakpoint». Where DelaunayWin32 is the name of my project. This error occurs on ShowWindow(hWnd,
  nCmdShow) function call. But this error does not always appear, but only from time to time, since often my application starts normally. If this error occurs and I click «Retry» button in the error message dialog then I can see the following
  picture:

  

  I apologize for the Russian-language comments in the source code of the application. Sometimes when I start my application, an error of a slightly different kind appears. Here it is.

  

  But again, I repeat, such things do not always happen. Sometimes, my application starts up normally. In Stackoverflow, MSDN, and other forums, I read several posts on this topic. But the discussions are so specific to each specific application that
  it is difficult to navigate them. If possible, please direct me in the right direction, that is, in what place of my application should I look for the cause of the error I’m talking about. Of course, I understand that this is not a simple thing,
  since, figuratively speaking, my application does not consist of ten lines of source code. Sometimes a similar error occurs when processing a WM_CLOSE message on a call to the DestroyWindow (hWnd) function. But again, I repeat, this does not always happen.
  Sometimes my application closes normally. If possible, please tell me what is the reason for this error. And from what place in the program I should start searching for the causes of this error. Thanks in advance.

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    Monday, June 29, 2020 1:37 AM

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• MSVS has triggered a breakpoint

1. 04-06-2013

   
   

   #1

   

   
   Registered User
   

   ---

   MSVS has triggered a breakpoint
   

   Hi guys,

   We are just learning how to implement calloc, malloc and free. At the end of my program, I keep getting a «windows has triggered a break point» error. Im pretty sure that this error is happening because of the way I am implementing free because this is the error I am getting in free.c — » retval = HeapFree(_crtheap, 0, pBlock);»

   here is the code which I allocate and free memory:

   Code:

   int main (){
        
       WORDS userWords[16];
       char **board;
       int i=0, n=0, numWords=0;
       srand(time(NULL));
         numWords = enterWords(userWords);
   
   
       board = (char **) calloc(20, sizeof(char));
       for (i=0; i<20; i++){
           board[i] = (char *) calloc(40, sizeof(char));
       }
       for(i=0; i<20; i++)
       {
           if(i != 0)
               printf("n");
           for(n=0; n<40; n++){
               board[i][n] = '0';
               printf("%c", board[i][n]);
           }
       }
       
       inputWords(userWords, board, numWords);
       cls;
       for(i=0; i<20; i++)
       {
           if(i != 0)
               printf("n");
           for(n=0; n<40; n++){
               printf("%c", board[i][n]);
           }
       }
       pause;
       populateGameBoard(userWords, board);
       displayGameBoard(userWords, board, numWords);
       pause;
       free(board);
       return 0;
   }

   ---

2. 04-06-2013

   
   

   #2

   

   
   Registered User
   

   ---

   We are just learning how to implement calloc, malloc and free. At the end of my program, I keep getting a «windows has triggered a break point» error. Im pretty sure that this error is happening because of the way I am implementing free because this is the error I am getting in free.c — » retval = HeapFree(_crtheap, 0, pBlock);»

   When people say they are implementing a function, they usually mean that they are writing that function. It doesn’t look like you are creating your own custom malloc, calloc, and free functions. I am assuming you meant that you are learning to use these functions rather than implementing custom versions of them.

   Code:

       board = (char **) calloc(20, sizeof(char));     
       for (i=0; i<20; i++){         
           board[i] = (char *) calloc(40, sizeof(char));     
       }

   You’re not allocating enough space for board. board is a pointer to a char pointer. sizeof (char) = 1. Unless you’re on some obscure system, sizeof (char *) will most likely be larger than that on your system.

   Try this:

   Code:

       board = calloc (20, sizeof (char *)) ;
       for (i=0; i<20; i++) {         
           board [i] = calloc (40, sizeof (char)) ;
       }

   I didn’t look at the rest of your code.

   Last edited by failure67; 04-06-2013 at 07:54 PM.

   ---

3. 04-06-2013

   
   

   #3

   

   
   Registered User
   

   ---

   I am getting «a value of type void* cannot be assigned to entity of type char**» with that calloc declaration. Is that because I declared char **board?

   Thanks

   ---

4. 04-06-2013

   
   

   #4

   

   
   Registered User
   

   ---

   Thanks Failure67,

   I got it to work with this:

   Code:

   board = (char **)calloc (20, sizeof (char* )) ;
   for (i=0; i<20; i++) {         
        board [i] = (char *)calloc (40, sizeof (char)) ;
   }

   I still don’t quite understand why. It looks like I am allocating 40 bytes to every value of i. Its not giving me the break error anymore though.

   ---

5. 04-06-2013

   
   

   #5

   

   
   Registered User
   

   ---

   I am getting «a value of type void* cannot be assigned to entity of type char**» with that calloc declaration. Is that because I declared char **board?

   My bad, I skipped the fact you’re using MSVS. MSVS is a c++ compiler, and the c++ language requires the casts that you added to your code. Pure C does not require (or recommend) those casts.

   I still don’t quite understand why. It looks like I am allocating 40 bytes to every value of i. Its not giving me the break error anymore though.

   The problem was specifically with this part:

   Code:

   board = (char **) calloc(20, sizeof(char));

   Because sizeof (char) < sizeof (char *), you have not allocated enough memory for 20 pointers. That’s why you had to change it to this:

   Code:

   board = (char **)calloc (20, sizeof (char* )) ;

   You also have a memory leak in your code. You have to free the 40 byte buffers that each of these 20 pointers pointed to.

   So you need to add something like this to the end of your code:

   Code:

   for (i = 0; i < 20; ++i) {
       free (board [i]) ; // Free the 40 byte buffers of each pointer
   }
   
   free (board) ; // Free the array of pointers

   ---

6. 04-06-2013

   
   

   #6

   

   
   and the hat of int overfl
   

   

   ---

   Then you should name your source files to be prog.c, not prog.cpp.
   This should give the compiler driver the clue to use the C rather than C++ compiler.

   Or use this flag to force language choice.
   /Tc, /Tp, /TC, /TP (Specify Source File Type) (C++)

   ---

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