I have the below C# definitions and function call to an unsafe C++/CLI
function in an external dll. When debugging the calls step by step everything
seems to work, but if I just run everything through without stopping I get
the following error:

"
Debug Assertion Failed!

Program: .....myprogram..
File: dbgheap.c
Line: 1279

Expression: _CrtIsValidHeapPointer(pUserData)

...
"

If I press ignore three times the whole application crashes. Here is the code:

       [DllImport(g_wrapper_dll_path)]
       unsafe static extern int GetEncoders(
           void* dvpsdk,
           ref int[] devices_ids);

       IntPtr m_DVPSDK_ptr;
               void* l_ptr = m_DVPSDK_ptr.ToPointer();
               int l_result = GetEncoders(
                   l_ptr,
                   ref m_devs_ids);

The C++/CLI functions:

    extern "C" int GetEncoders(
        System::IntPtr dvpsdk,
        array<int>^ devices_ids)
    {
        return AdvantechImpl::GetEncoders(
            (DVP1412DLL*) dvpsdk.ToPointer(),
            devices_ids);
    }

    const int GetEncoders(
        DVP1412DLL* dvpsdk,
        array<int>^ devices_ids)
    {
        int l_nr_of_devices =
            dvpsdk->DVP1412_GetNoOfDevices();

        if (l_nr_of_devices == 0)
        {
            return -3;
        }

        int* l_tmp = new int[devices_ids->Length];

        int l_res = dvpsdk->DVP1412_InitSDK(
            l_nr_of_devices,
            l_tmp);

        if (l_res == SUCCEEDED)
        {
            for (int l_i = 0; l_i < devices_ids->Length; ++l_i)
            {
                devices_ids[l_i] = l_tmp[l_i];
            }

            l_res = dvpsdk->DVP1412_CloseSDK();
            return l_nr_of_devices;
        }
        else
        {
            return l_res;
        }
    }