C0000005 error for Visual Studio 2005

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Hello again. I've managed to complete a program, and it compiles fine, but as soon as I try to run it it crashes. The debugger claims this is due to unhandled exception c0000005. The only article I can find on this talks about the dangers of using C functions like strlength, but I'm not using anything like that here.

I get a breakpoint at an enumeration when it fails

C++

enumerated card_status {tapped, untapped, damaged}

class C
{
public:

C()
{
status = tapped;
}

void change_status
{
if (status == tapped)
status = untapped;
};

private:
card_status status;
};

And it locks up at status = tapped; every time. Does anyone have any idea what the problem here is? Thanks for your time.

Posted 7-Aug-14 15:14pm

Member 10788894

Updated 7-Aug-14 15:44pm

PIEBALDconsult

v2

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chandanadhikari 8-Aug-14 1:59am

hi,
what is 'enumerated' in the first line of code . Is it something you have defined because otherwise it should be 'enum' if you are declaring an enumeration.
An enum is declared as :
enum colors_t {black, blue, green};
You can check if changing it to enum helps.

CPallini 8-Aug-14 3:11am

You should post the actual code. The 'enumerated' line is meaningless in C++.

Philippe Mori 8-Aug-14 20:57pm

When the debugger stop on the exception, you normally have all necessary information to verify that your object is valid.

2 solutions

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Stefan_Lang · Answer 1 · 2014-08-07T21:06:00

C0000005 indicates an access vialoation. Usually it means you are trying to access invalid memory, either by dereferencing a pointer not pointing to valid memory, or by using a pointer to reach past the bounds of the memory it points to.

In your case, it looks like you're somehow invoking the constructor C::C() in an inappropriate way, i. e. on an invalid memory address. This is only possible if you directly call the constructor on an invalidated object, or on a pointer that was never instantiated with an object. The bug is in the code that calls the constructor!

P.S.:
Here are a few examples that may cause error C0000005:

1. wrong way to construct an object

C++

void construct_fail()
{
   C* pc;   // dangerous: declare pointer without initialization!
   pc->C(); // error C0000005
}

2. trying to "reinitialize" a destroyed object

C++

void reinitialize_fail(C* pc)
{
   // dangerous: state of pc is unknown at this point - it may be valid or invalid
   pc->C(); // error: if pc is invalid, you get error C0000005, otherwise you construct 
            // an already constructed object, invoking another run-time error
}

3. Trying to construct an object in-place on an invalid memory pointer

C++

C* make_C(void* my_memory_block)
{
   return new (my_memory_block) C; // calls constructor, but fails to check pointer validity
}
...
   void* memblock; // danger: unintialized pointer
   C* pc = make_C(mem); // error C0000005

KarstenK · Answer 2 · 2014-08-08T02:06:00

Solution 2

As Stefan said it will be an access vilation.

I guess you accessing a pointer "C*" but it NEEDS to point to a object:

C++

C *p = new C();
//do stuff with p
delete p;//free memory

You should provide the code if it stays unclear.

Posted 8-Aug-14 2:06am

KarstenK