NumericArrayResize crash

[Tomi_Maila]

What's wrong when NumericArrayResize CIN function crashed. The weird thing is that it didn't crash until I recompiled my DLL made in Labview. The code crashes at NumericArrayResize call even if I don't call my labview DLL. I extracted the relevant parts of the code to below.

#include "extcode.h"
typedef struct {
    long dimSize;
    double Value[1];
    } TD3;
typedef TD3 **TD3Hdl;

void NervusFile::Crash(void)
{

      TD3Hdl dtHdl=NULL;
      long channels = 32;
      dtHdl= (TD3Hdl)(DSNewHandle(sizeof(TD3)));
         NumericArrayResize(0x0A, 1, (UHandle *) &dtHdl, channels);
}

[rolfk]

---

@Tomi M wrote:
What's wrong when NumericArrayResize CIN function crashed. The weird thing is that it didn't crash until I recompiled my DLL made in Labview. The code crashes at NumericArrayResize call even if I don't call my labview DLL. I extracted the relevant parts of the code to below.

#include "extcode.h"
typedef struct {
    long dimSize;
    double Value[1];
    } TD3;
typedef TD3 **TD3Hdl;

void NervusFile::Crash(void)
{

      TD3Hdl dtHdl=NULL;
      long channels = 32;
      dtHdl= (TD3Hdl)(DSNewHandle(sizeof(TD3)));
         NumericArrayResize(0x0A, 1, (UHandle *) &dtHdl, channels);
}

---

NumericArrayResize can allocate a new handle when passed in a NULL handle. And it is always a good idea to actually
check your error return values. Last but not least since you are using C++ here your Crash method might be invoked somehow through the constructor of your object. Hard to say without seeing all the code.

MgErr NervusFile::Crash(void)
{

      TD3Hdl dtHdl=NULL;
      long channels = 32;
      MgErr err =  NumericArrayResize(fD, 1, (UHandle *) &dtHdl, channels);

      /* since the handle is not passed out it would be a good idea to actually deallocate it again.
         Are you sure this method is not somewhere called in a circular reference over and over again,
         which would create an out of mem condition at some point? */
      if (!err)
         err = DSDisposeHandle(dtHdl);

      return err;
}

Rolf Kalbermatter

[kolan]

rolfk:NumericArrayResize can allocate a new handle when passed in a NULL handle.

I'm not shure you are right, please look here

Is there a bug in arrresize.c and in the documentation?

[rolfk]

---

kolan wrote:

rolfk:NumericArrayResize can allocate a new handle when passed in a NULL handle.

I'm not shure you are right, please look here

Is there a bug in arrresize.c and in the documentation?

---

I'm not sure what you try to show in that other thread. For me it simply lacks any consistent theme and context.

But I'm 100% sure that the NumericArrayResize() function that is exported by the LabVIEW kernel will work properly with this code:

UHandle h = NULL;

MgErr err = NumericArrayResize(uB, 1, &h, size);

and allocate an according handle of size bytes.