FATAL RUN-TIME ERROR: Dereference of out-of-bounds pointer: 1388055715 bytes (86753482 elements) before start of array.

[KavehV]

Yes, but in cases when you dynamically allocate an array or variable pointer, you don't always have this option.  You simply have to point to NULL.

[MJF]

When I am dynamically allocating a buffer, I always initialize the pointer to NULL.

This tells me the pointer is not valid and I can use it to test if the buffer had been previously allocated before doing a call to free.

Like so:

double * buffer = NULL;

buffer = malloc (sizeof (double) * BUFFER_SIZE);

if (buffer != NULL) free (buffer);

[chemph]

The variable is declared as

             CMSG cmsg_tx[2047];      /* buffer for can messages */ 

How should I allocate is this case?

I do not understand the fact that a few elements (of index) past end of array but the value  of index at moment of error is 0 (0=0)....

[chemph]

The described error does still appear sometimes. Is it possible that CVI has an error because of reporting out-of-bound while the index is set to zero? Maybe I can find my mistake if you can explain me what the meaning of the reportet error is. (Dereference of out-of-bound-pointer"

[刘翠翠]

Have you resove your problem about "out-of-bounds pointer"?I also encounter the same problem. Please share me how to deal with the problem

[chemph]

No, sometimes the problem does still appear. I am not sure about the exact error source, but the problem does only appear in some routines. Maybe it is a grubby programming style at some program parts. - I do not know up to the present.

It would be nice if you can tell if you find something out.

[FrankieBoy98]

I had a relatively similar error. In one of our programs there is used a structure-type with variables and other structure-types inside, with variables and array-variables inside the inner structures, and arrays of structures of the inner structures. (How complicated 😐 ! But so the former programmers liked it! 😉 ) Let's have the following: A instance of th "main" structure-type (now called "abc") and a array of the inner structure (now called "fgh[3]") and a array-variable "arr[4]" inside the inner structure. And this "abc" is a pointer parameter of a function: "FunctionXYZ(TheStructureTypeOfABC *abc)". Inside of "FunctionXYZ" we accessed "arr[i]" from LabWindows 5.5 till 2012 by the following code: abc->fgh->arr[i] The implicit meaning of no index at "fgh" was that the compiler used the Index "0"-element. Now the 2013 compiler complains "Dereference of out-of-bounds pointer: 1 bytes (1 elements) past end of array." I changed the code the following: - A new temporary array "tmpArr[4]" was created. - I put the 4 values into "tmpArr[i]" (i=0,...3). - Finaly I made "memcpy(abc->fgh->arr, tmpArr, 4);" I think it would get the same result by putting all the 4 Values into "abc->fgh[0]->arr[i]". But I didn't checked that. Maybe that hint will help others to find the error not in the compiler-marked index-variable (here "arr") but in the (seamingly not marked) 'precursor'-variable(s) (here "fgh").

[FrankieBoy98]

Sorry ... all my carriage-returns of the input-field are gone in the web-presentation.

[bane_666]

I had similar problem.

Maybe this is where you make mistake.

For example if this is your callback function

int CVICALLBACK callback (int panel, int control, int event, void *callbackData, int eventData1, int eventData2)
{
        switch (event)
        {
                 case EVENT_COMMIT:

                              int variable1, variable2;           // initialize variable. 

                              float variable 3, variable 4; 

                             function1...

                             function2....

                             break;
         }
         return 0;
}

You should put initialization variable above "switch (event)" and below "CVICALLBACK callback (int panel, int control, int event, void *callbackData, int eventData1, int eventData2)"

Like this:

int CVICALLBACK callback (int panel, int control, int event, void *callbackData, int eventData1, int eventData2)
{

         int variable1, variable2;           // initialize variable. 

         float variable 3, variable 4; 

        switch (event)
        {
                 case EVENT_COMMIT:

                             function1...

                             function2....

                             break;
         }
         return 0;
}

After this i dont get message error: ATAL RUN-TIME ERROR: Dereference of out-of-bounds pointer: 1388055715 bytes (86753482 elements) before start of array.

[PSA253]

I had similar problems in DEBUG configuration ONLY. CVI debugger gives (misleading?) "Dereference of out-of-bounds pointer" in situations where everything looks fine, or at least it's difficult to understand what the issue refers to.

So I had to disable "run-time check" in Debug build configuration to move on (Release build works fine).

I'm using now CVI 2017 so it looks like this issue remains for several versions.

Regards,

/Paolo Santos