CVI 2013 ' FATAL RUN - TIME ERROR: pointer to free memory passed to the function of library "when you access a struct of struct


typedef struct StringsStruct
  char A[10];
  char AA[10];

  char B[10];
  char BB[10];

  char C[10];
  char CC[10];
} StringsStructType;

StringsStructType Strings = {0};

char *const SelectedStrings[3] =

int __stdcall WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                       LPSTR lpszCmdLine, int nCmdShow)
  if (InitCVIRTE (hInstance, 0, 0) == 0)
    return -1;    /* out of memory */

  strcpy( SelectedStrings[1], "TEXT" );
  /*** FATAL RUN-TIME ERROR:   "main.c", line 32, col 11, thread id 0xXXXXXXXX:   Pointer to free memory passed to library function. ***/


  return 0;

Any chance to get this working in 2013 CVI?

"& Strings.A [0]" does not work either.


Hello CVI - User!

Thank you for reporting the issue. I filed the bug report # 423491.

I did have a chance to get rid of the error by changing the definition of the structure, but I was able to get the program running by disabling execution checking when the fields in the structure are initialized:

strcpy( (char*)(uintptr_t)SelectedStrings[1], "TEXT" );

Or perhaps a more descriptive workaround solution:

#define UNCHECKED(x) ((void*)(uintptr_t)(x))
strcpy( UNCHECKED(SelectedStrings[1]), "TEXT" );

Thank you


Tags: NI Software

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