Access violation on EIP - causing Crash

I have a small VI who call the two APIs from a DLL. When I press on the register, the FI_Register_wrapper() is called, and when I press "Registration", FI_get_handle_by_name_wrapper() is called.  Two calls works perfectly. But when I close the the LabVIEW VI crashes. It gives an access to the error of the EIP violation. Help, please. I also included my VI.

skariaroy wrote:

We checked the library to find anywhere that the dll corrupts the memmory. We have tried several times using several tools and could not find any place where the dll corrupts the labview memmory. If the dll is perfect. It is not possible to write the things of all DLLs in LabVIEW. We have to code in C++, since we already have the dll.

The fact that it crashes is enough evidence that your assertion that your DLL is perfect is not true! It's as simple as that!

skariaroy wrote:

CameraServices * cs = new CameraServices (name);
Return FI_OK;

reffrering the above code belonging to a dll. If I come back from service before allocating a memmory of type CameraServices *, not crash the program. Education CameraServices * cs = new CameraServices (name). makes the application crash. It is just a memmory allowance. Why LabVIEW even cares it?

LabVIIEW only cares memory allocation! This is memory allocated your DLL and LabVIEW is happy to let this memory alone. No doubt well, what happens is something to this appeal does not behave properly and is damaging the memory that it does not have touch! It could be that the name parameter is something that you think it should be, and that therefore not spend you wrongly LabVIEW to your DLL, or it could be as simple as a bug in the constructor of this class. Or something added recognition as a pilot of the incompatibilities in the lower level components of your CameraServices class.

An additional note: the code you write he will flee the CameraService object whenever you call this function. Which will not cause LabVIEW to plant well (not quickly at least until missing memory).

I can assure you with certainty of 120%: this is not benevolent LabVIEW that you create an object of type CameraClass in your code, but it's something in the code that you have written or in code you call who misbehaves. And unfortunately your observation is not sufficient to identify the cause certainly. Leaving further appeal may seem to solve the problem, but the reality is that the bug can be somewhere completely elsewhere in your code, but leaving far who call the provision of memory is also rearranged and your bug will damage the other memory not as an essential element for LabVIEW. He can always down sooner or later.

And it is not for lack of LabVIEW that you don't have to worry about these troubles when programming in LabVIEW. But you are programming in C (++) now, and that comes with its own and many more unpleasant questions!

Tags: NI Software

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